Fluke RPM4-AD User Manual

RPM4-AD™

Reference Pressure Monitor, Air Data Version

Operation and Maintenance Manual

High pressure liquids and gases are potentially hazardous. Energy stored in these liquids and gases

can be released unexpectedly and with extreme force. High pressure systems should be assembled and operated only by personnel who have been instructed in proper safety practices.

This instrument is not to be operated in any other manner than that specified by the manufacturer.

Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, a

Fluke Company 4765 East Beautiful Lane, Phoenix AZ 85044-5318, USA.

DH Instruments makes sincere efforts to ensure accuracy and quality of its’ published materials; however, no warranty, expressed

or implied, is provided. DH Instruments disclaims any responsibility or liability for any direct or indirect damages resulting from the use of the information in this manual or products described in it. Mention of any product or brand does not constitute an endorsement by DH Instruments of that product or brand. This manual was originally composed in English and was subsequently translated into other languages. The fidelity of the translation cannot be guaranteed. In case of conflict between the English version and other language versions, the English version predominates.

Products described in this manual are manufactured under international patents and one or more of the following U.S. patents: 5,142,483; 5,257,640; 5,331,838; 5,445,035. Other U.S. and international patents pending.

AutoRange, AutoZ, DH Instruments, DH, DHI, CalTool, COMPASS, parallel measurement mode, //m mode, RPM4, QDUT, Q-RPT, RPM4-AD and SDS are trademarks, registered and otherwise, of DH Instruments, a Fluke Company

Document No. 550148 051115 Printed in the USA.

AABBLLEE

OONNTTEENNTTS

TABLE OF CONTENTS ...............................................................I

TABLES ..................................................................................V

FIGURES................................................................................VI

ABOUT THIS MANUAL ............................................................VII

1. INTRODUCTION

1.1 PRODUCT OVERVIEW ...........................................................................................................................1

1.2 SPECIFICATIONS ...................................................................................................................................2

1.2.1 GENERAL SPECIFICATIONS....................................................................................................................... 2

1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS........................................................................................2

1.2.2.1 QUARTZ REFERENCE PRESSURE TRANSDUCERS (Q-RPT)..............................................................2

1.2.2.2 ON-BOARD BAROMETER ........................................................................................................................4

1.2.3 BATTERY AND CHARGER PACK ................................................................................................................4

................................................................. 1

2. INSTALLATION .................................................................. 5

2.1 UNPACKING AND INSPECTION ............................................................................................................5

2.1.1 REMOVING FROM PACKAGING..................................................................................................................5

2.1.2 INSPECTING CONTENTS.............................................................................................................................5

2.2 SITE REQUIREMENTS............................................................................................................................6

2.3 SETUP .....................................................................................................................................................6

2.3.1 PREPARING FOR OPERATION ...................................................................................................................6

2.3.2 FRONT AND REAR PANELS ........................................................................................................................ 6

2.3.2.1 FRONT PANEL ..........................................................................................................................................6

2.3.2.2 REAR PANEL.............................................................................................................................................7

2.3.3 POWER CONNECTION................................................................................................................................. 7

2.3.3.1 85 TO 264 VAC, 50/60 HZ VAC POWER ..................................................................................................7

2.3.3.2 BATTERY PACK ........................................................................................................................................7

2.3.4 REMOTE [ENT] CONNECTION (FOOTSWITCH OR OTHER SWITCH)...................................................... 8

2.3.5 CONNECTING TO MEASURE PRESSURE (PS AND PT PORTS)..............................................................8

2.3.6 THE VENT AND ATM PORTS....................................................................................................................... 9

2.3.7 CHECK/SET SECURITY LEVEL ...................................................................................................................9

2.3.8 SDS FULL TIME OFF ....................................................................................................................................9

2.4 POWER-UP AND VERIFICATION.........................................................................................................10

2.4.1 SWITCH POWER ON ..................................................................................................................................10

2.4.2 CHECK PRESSURE MEASUREMENT OPERATION.................................................................................10

2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT.............................................................10

2.4.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT...................................................................10

2.5 SHORT TERM STORAGE ..................................................................................................................... 11

3. OPERATION

3.1 USER INTERFACE ................................................................................................................................13

3.1.1 MAIN RUN SCREEN....................................................................................................................................13

3.1.2 FUNCTION / DATA KEYPAD LAYOUT AND PROTOCOL.........................................................................15

3.1.3 REMOTE [ENT] (ENTER) FOOTSWITCH...................................................................................................16

3.1.4 SOUNDS ......................................................................................................................................................16

..................................................................... 13

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

3.2 GENERAL OPERATING PRINCIPLES .................................................................................................16

3.2.1 Q-RPTS AND Q-RPT SELECTION..............................................................................................................16

3.2.2 GAUGE AND NEGATIVE GAUGE MEASUREMENT, DYNAMIC COMPENSATION

FOR ATMOSPHERIC PRESSURE..............................................................................................................17

3.2.3 ALTITUDE AND AIRSPEED MEASUREMENT...........................................................................................18

3.2.3.1 RPM4-AD A160K/A160K (ROTARY WING).............................................................................................18

3.2.3.2 RPM4-AD A350K/A160K (FIXED WING)................................................................................................. 19

3.2.4 PRESSURE READY/NOT READY ..............................................................................................................20

3.2.5 PARALLEL MEASUREMENT MODE (//MTM) (RPM4-AD A160K/A160K ONLY) .......................................20

3.2.6 DIFFERENTIAL MEASUREMENT MODE...................................................................................................21

3.2.7 AUTOZERO FUNCTION..............................................................................................................................21

3.2.8 SDS SELF DEFENSE SYSTEM ..................................................................................................................21

3.2.9 USE OF THE 12VDC BATTERY/CHARGER PACK ...................................................................................22

3.2.10 USING RPM4-AD WITH A PPC3 CONTROLLER/CALIBRATOR ..............................................................23

3.2.11 DIRECT FUNCTION KEYS SUMMARY ......................................................................................................23

3.3 DIRECT FUNCTION KEYS ....................................................................................................................24

3.3.1 [RANGE] ......................................................................................................................................................24

3.3.1.1 RPM4-AD A160K/A160K (ROTARY WING).............................................................................................25

3.3.1.2 RPM4-AD A350K/A160K (FIXED WING)................................................................................................. 26

3.3.2 [UNIT]........................................................................................................................................................... 27

3.3.3 [MODE] ........................................................................................................................................................30

3.3.3.1 DIFFERENTIAL MEASUREMENT MODE OPERATION.........................................................................31

3.3.4 [AUTORANGE] ............................................................................................................................................33

3.3.5 [LEAK CK]/RATE OF CHANGE MEASUREMENT ..................................................................................... 33

3.3.6 [DISPLAY]....................................................................................................................................................34

3.3.6.1 AVG (AVERAGE) .....................................................................................................................................36

3.3.6.2 RATE........................................................................................................................................................37

3.3.6.3 DEV (DEVIATION) ...................................................................................................................................38

3.3.6.4 RPT ..........................................................................................................................................................39

3.3.6.5 HI/LO ........................................................................................................................................................40

3.3.6.6 FREEZE ...................................................................................................................................................41

3.3.6.7 CLEAN .....................................................................................................................................................42

3.3.7 [HEAD] .........................................................................................................................................................42

3.3.8 [SDS] (SELF DEFENSE SYSTEM) .............................................................................................................43

3.3.8.1 SDS IN DIFFERENTIAL MEASUREMENT MODE ..................................................................................45

3.3.8.2 SDS IN PARALLEL MEASUREMENT MODE, RPM4-AD A160K/A160K ONLY..................................... 46

3.3.9 [AUTOZ]....................................................................................................................................................... 47

3.3.9.1 [AUTOZ] IN GAUGE AND NEGATIVE GAUGE MODE ...........................................................................47

3.3.9.2 [AUTOZ] IN ABSOLUTE MODE...............................................................................................................48

3.3.9.3 AUTOZ IN DIFFERENTIAL MODE .......................................................................................................... 51

3.3.10 [ENT]............................................................................................................................................................52

3.4 [SETUP] .................................................................................................................................................53

3.4.1 <1RANGE> ..................................................................................................................................................53

3.4.2 <2RES> (RESOLUTION) .............................................................................................................................53

3.4.3 <3STAB>......................................................................................................................................................54

3.4.4 <4UL> (UPPER LIMIT) ................................................................................................................................55

3.4.4.1 OVER PRESSURE FUNCTION...............................................................................................................56

3.4.5 <5ATEST>....................................................................................................................................................56

3.5 [SPECIAL] .............................................................................................................................................56

3.5.1 <1AUTOZ> ...................................................................................................................................................57

3.5.1.1 EDIT AUTOZ ............................................................................................................................................61

3.5.2 <2REMOTE> ................................................................................................................................................61

3.5.2.1 <1COM1, 2COM2>...................................................................................................................................62

3.5.2.2 <3IEEE-488>............................................................................................................................................62

3.5.2.3 <4FORMAT> ............................................................................................................................................62

3.5.2.4 <5RS232 SELF-TEST>............................................................................................................................63

3.5.3 <3HEAD> .....................................................................................................................................................63

3.5.4 <4SDS>........................................................................................................................................................64

3.5.4.1 <1TEMP OPEN/CLOSE>.........................................................................................................................64

3.5.4.2 <2FULL TIME ON/OFF> ..........................................................................................................................65

3.5.5 <5PREFS> ...................................................................................................................................................65

3.5.5.1 <1SCRSVR> ............................................................................................................................................66

3.5.5.2 <2SOUND> ..............................................................................................................................................66

3.5.5.3 <3TIME>...................................................................................................................................................67

3.5.5.4 <4ID>........................................................................................................................................................67

3.5.5.5 <5LEVEL> (SECURITY)...........................................................................................................................68

3.5.6 <6PUNIT>.....................................................................................................................................................70

3.5.7 <7INTERNAL> .............................................................................................................................................74

3.5.7.1 <1BARO> .................................................................................................................................................74

3.5.7.2 <2READRT> ............................................................................................................................................75

3.5.7.3 <3RPT2X>................................................................................................................................................76

3.5.7.4 <4LO VNT> ..............................................................................................................................................76

TABLE OF CONTENTS

3.5.7.5 <5LOG>....................................................................................................................................................76

3.5.8 <8CAL> ........................................................................................................................................................77

3.5.9 <9RESET> ...................................................................................................................................................77

3.5.9.1 <1SETS>..................................................................................................................................................78

3.5.9.2 <2 UNITS> ...............................................................................................................................................78

3.5.9.3 <3ATEST>................................................................................................................................................78

3.5.9.4 <4 CAL> ...................................................................................................................................................79

3.5.9.5 <5 ALL>....................................................................................................................................................79

4. REMOTE OPERATION ....................................................... 81

4.1 OVERVIEW ............................................................................................................................................81

4.2 INTERFACING .......................................................................................................................................81

4.2.1 RS232 INTERFACE .....................................................................................................................................81

4.2.1.1 COM1 .......................................................................................................................................................81

4.2.1.2 IEEE-488 ..................................................................................................................................................82

4.2.1.3 COM2 .......................................................................................................................................................82

4.3 PROGRAMMING FORMATS................................................................................................................. 82

4.3.1 CLASSIC PROGRAM MESSAGE FORMAT ............................................................................................... 83

4.3.2 ENHANCED PROGRAM MESSAGE FORMAT ..........................................................................................83

4.3.2.1 USING COMMAND TYPE COMMANDS .................................................................................................83

4.3.2.2 USIN G Q UE RY TYPE COMMANDS ...................................................................................................84

4.4 COMMANDS ..........................................................................................................................................85

4.4.1 PROGRAMMING MESSAGES ....................................................................................................................85

4.4.2 ERROR MESSAGESS.................................................................................................................................86

4.4.3 PROGRAM MESSAGE DESCRIPTION OVERVIEW..................................................................................87

4.4.4 PROGRAM MESSAGE DESCRIPTIONS....................................................................................................88

4.4.5 REMOTE AIRDATA SETUP PROCEDURES ............................................................................................ 107

4.5 STATUS REPORTING SYSTEM .........................................................................................................108

4.5.1 ERROR QUEUE......................................................................................................................................... 108

4.5.2 STATUS BYTE REGISTER ....................................................................................................................... 109

4.5.3 STANDARD EVENT REGISTER ...............................................................................................................110

4.5.4 READY STATUS REGISTER .................................................................................................................... 111

4.6 IEEE STD. 488.2 COMMON AND STATUS PROGRAM MESSAGES................................................ 112

4.6.1 PROGRAM MESSAGE DESCRIPTIONS..................................................................................................112

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION ................115

5.1 OVERVIEW ..........................................................................................................................................115

5.2 CALIBRATION OF QUARTZ REFERENCE PRESSURE TRANSDUCERS (Q-RPT).........................115

5.2.1 PRINCIPLE ................................................................................................................................................115

5.2.1.1 PA AND PM COEFFICIENTS ................................................................................................................116

5.2.1.2 AS RECEIVED AND AS LEFT DATA ....................................................................................................116

5.2.2 EQUIPMENT REQUIRED .......................................................................................................................... 117

5.2.3 SET-UP AND PREPARATION...................................................................................................................117

5.2.3.1 RPM4 A160K/A160K (ROTARY WING).................................................................................................117

5.2.3.2 RPM4 A350K/A160K (FIXED WING) .....................................................................................................118

5.2.4 RECOMMENDED CALIBRATION POINT SEQUENCE............................................................................118

5.2.4.1 A160K Q-RPT CALIBRATION SEQUENCE ..........................................................................................118

5.2.4.2 A350K Q-RPT CALIBRATION SEQUENCE ..........................................................................................119

5.2.5 TURNING OFF ABSOLUTE AND NEGATIVE GAUGE M E AS U R E M E N T MODES ........................... 120

5.2.6 Q-RPT CALIBRATION USING CALTOOL FOR RPTS SOFTWARE........................................................ 120

5.2.7 EDITING AND VIEWING Q-RPT CALIBRATION INFORMATION............................................................120

5.2.8 Q-RPT CALIBRATION/ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE.........................121

5.3 ADJUSTMENT OF ON-BOARD BAROMETER...................................................................................123

5.4 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY......................................................123

5.5 SUBASSEMBLY DESCRIPTION AND LOCATION ............................................................................124

5.5.1 MINI MICRO BOARD................................................................................................................................. 124

5.5.2 POWER SUPPLY MODULE ......................................................................................................................124

5.5.3 DRIVER BOARD........................................................................................................................................125

5.5.4 ON-BOARD BAROMETER........................................................................................................................125

5.5.5 Q-RPT MODULE........................................................................................................................................125

5.5.5.1 HI Q-RPT MODULE ...............................................................................................................................125

5.5.5.2 LO Q-RPT MODULE ..............................................................................................................................125

5.5.6 DISPLAY ....................................................................................................................................................125

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

5.6 Q-RPT MODULE PNEUMATIC SCHEMATIC AND VALVE STATES .................................................126

5.6.1 RPM4-AD A160K/A160K (ROTARY WING) ..............................................................................................126

5.6.2 RPM4-AD A350K/A160K (FIXED WING) ..................................................................................................127

6. TROUBLESHOOTING .......................................................129

7. APPENDIX

7.1 REMOTE [ENT] ...................................................................................................................................133

7.2 UNIT CONVERSION ............................................................................................................................ 134

7.2.1 PRESSURE................................................................................................................................................134

7.2.2 ALTITUDE.................................................................................................................................................. 134

7.2.3 AIRSPEED .................................................................................................................................................135

......................................................................133

8. WARRANTY ....................................................................139

8.1 OVERVIEW ..........................................................................................................................................139

9. GLOSSARY

.....................................................................141

TABLES & FIGURES

AABBLLEES

Table 1. Quartz Reference Pressure Transducer (Q-RPT) module designations and ranges ................... 3

Table 2. RPM4-AD packing list .................................................................................................................... 5

Table 3. Making pressure connections to RPM4-AD................................................................................... 8

Table 4. Position designators of Q-RPTs in an RPM4-AD system............................................................ 16

Table 5. Settings and what they are specific to (range, measurement mode, Q-RPT, system) .............. 17

Table 6. Summary of RPM4-AD function key operation............................................................................ 24

Table 7. Available unit of measure types by active Q-RPT and measurement mode,

Table 8. Available unit of measure types by active Q-RPT and measurement mode,

Table 9. Default [UNIT] choices by active Q-RPT and measurement mode,

Table 10. Default [UNIT] choices by active Q-RPT and measurement mode,

Table 11. AutoZ ON and OFF.................................................................................................................... 59

Table 12. Security levels............................................................................................................................ 69

Table 13. Available unit of measure types by active Q-RPT and measurement mode,

Table 14. UNIT function - available units of measure................................................................................ 72

Table 15. Available unit of measure types by active Q-RPT and measurement mode,

Table 16. READRT - display update rates................................................................................................. 75

Table 17. Reset – Sets............................................................................................................................... 78

Table 18. Reset – Cal ................................................................................................................................79

Table 19. Reset – All.................................................................................................................................. 79

Table 20. COM1 Pin Designations and Connections ................................................................................ 81

Table 21. COM2 DB-9F Pin Designations ................................................................................................. 82

Table 22. Program Message List ............................................................................................................... 85

Table 23. Error #s and Descriptions .......................................................................................................... 86

Table 24. 8 bit status byte register........................................................................................................... 109

Table 25. 8 bit standard event register .................................................................................................... 110

Table 26. 8 bit ready status register......................................................................................................... 111

Table 27. IEEE-488.2 common and status program message list ..........................................................112

Table 28. Calibration point sequence, A160K Q-RPT ............................................................................. 119

Table 29. Calibration point sequence, A350K Q-RPT ............................................................................. 119

Table 30. Q-RPT module valve states, RPM4-AD A160K/A160K........................................................... 126

Table 31. Q-RPT module valve states, RPM4-AD A350K/A160K........................................................... 127

Table 32. Troubleshooting guide .............................................................................................................129

Table 33. Pressure unit of measure conversion coefficients ................................................................... 134

Table 34. DHI Authorized Service Providers ........................................................................................... 140

RPM4-AD A160K/A160K (rotary wing).................................................................................... 28

RPM4-AD A350K/A160K (fixed wing) ..................................................................................... 28

RPM4 A160K/A160K (rotary wing).......................................................................................... 29

RPM4 A350K/A160K (rotary wing).......................................................................................... 29

RPM4-AD A160K/A160K (rotary wing).................................................................................... 71

RPM4-AD A350K/A160K (fixed wing) ..................................................................................... 73

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

IIGGUURREES

Figure 1. Front panel.................................................................................................................................... 6

Figure 2. Rear panel ....................................................................................................................................7

Figure 3. MAIN RUN screen display fields ................................................................................................ 14

Figure 4. Keypad layout ............................................................................................................................. 15

Figure 5. Battery pack/charger................................................................................................................... 23

Figure 6. Status register schematic .........................................................................................................109

Figure 7. Internal view..............................................................................................................................124

Figure 8. Pneumatic schematic and valve states, RPM4-AD A160K/A160K (rotary wing) ..................... 126

Figure 9. Pneumatic schematic and valve states, RPM4-AD A350K/A160K (fixed wing)....................... 127

Figure 10. Remote [ENT] connector schematic....................................................................................... 133

ABOUT THIS MANUAL

BBOOUUTT

This manual is intended to provide the user with the basic information necessary to operate an RPM4-AD reference pressure monitor. It also includes a great deal of additional information provided to allow you to optimize RPM4-AD use and take full advantage of its many features and functions.

This manual is specific to the “-AD” configuration of RPM4 (“AD” in front panel configuration window). If

you are not using an RPM4-AD, use the general RPM4 Operation and Maintenance Manual p/n 550129.

Before using the manual, take a moment to familiarize yourself with the Table of Contents structure: Sections 1, 2 and 3 should be read by all first time RPM4-AD users. Section 3 is most important for those using the local front panel interface but should be read over general RPM4-AD operating principles. Section 4 is for remote operation from an external computer. Section 5 provides maintenance and calibration information. Section 6 is a quick troubleshooting guide. Use it to troubleshoot unexpected RPM4-AD behavior based on the symptom of that behavior. Certain words and expressions have specific meaning as they pertain to RPM4-AD. The Glossary, Section 9, is useful as a quick reference for exact definition of specific words and expressions as they are used in the manual.

For those of you who “don’t read manuals”, go directly to Section 2.3 to set up your RPM4-AD and

then go to Section 2.4 for power-up and verification. This will get you up and running quickly with a minimal risk of causing damage to yourself or your RPM4-AD. THEN… when you have questions or start to wonder about all the great features you might be missing, get into the manual!

HHIISS

AANNUUAAL

by all users to familiarize themselves with

Manual Conventions

(CAUTION) is used in throughout the manual to identify user warnings and cautions.

(NOTE) is used throughout the manual to identify operating and applications advice and

additional explanations.

[ ] indicates direct function keys (e.g., [RANGE]).

< > indicates RPM4-AD screen displays (e.g., <1yes>).

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

OOTTEES

1. INTRODUCTION

11..

NNTTRROODDUUCCTTIIOON

1.1 PRODUCT OVERVIEW

RPM4-AD is a stand-alone, microprocessor driven, reference pressure monitor intended to precisely measure gas pressure in the range of air data instruments. It is designed to provide very high performance and extensive features combined with maximum versatility and ease of use. It is particularly well suited as a reference air data measurement device used to validate or calibrate air data test sets.

RPM4-AD uses two quartz reference pressure transducer (Q-RPT) modules and a barometer to measure pressure. There are two configurations. RPM4 A160Ka/A160Ka covers the altitude and airspeed range typically appropriate for rotary winged aircraft. RPM4 A350Ka/A160Ka covers the range of altitude and airspeed typically appropriate for fixed wing aircraft.

RPM4-AD can be controlled locally by the operator using its front panel display and keypad or remotely by a computer using ASCII character command strings transmitted over its standard RS232 or IEEE-488.2 interface.

RPM4-AD is a specialized air data version of the RPM4 Reference Pressure Monitor. The RPM4 Reference Pressure Monitor is available in a very wide variety of other configurations covering pressure ranges from as low as - 3 to 3 kPa (0.4 psi) to as high as 280 MPa (40 000 psi) in absolute, gauge, compound gauge and differential measurement modes.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

1.2 SPECIFICATIONS

1.2.1 GENERAL SPECIFICATIONS

Power Requirements

Operating Temperature Range

Ventilation

Storage Temperature Range

Vibration

Weight

Dimensions

Microprocessors

Communication Ports

Fuses

Pressure Ranges

A160K/A160K 160 kPa abs (23 psi) 160 kPa abs (23 psi) 60 kPa (8.7 psi) A160K/A350K 160 kPa abs (23 psi) 350 kPa abs (51 psi) 250 kPa (36 psi)

Altitude Range

A160K/A160K - 4 000 to 20 000 m (- 13 000 to 66 000 ft) A160K/A350K - 4 000 to 30 000 m (- 13 000 to 100 000 ft)

Airspeed Range (sea level)

A160K/A160K 0 to 1020 km/hr (550 kts) A160K/A350K 0 to 2040 km/hr (1100 kts)

Operating Medium

Pressure Connections

Ps , Pt

VENT, ATM 10-32 UNF

Self Defense System (SDS™)

Pressure Limits

Maximum working pressure 160 kPa abs (23 psi) 350 kPa abs (51 psi)

Maximum pressure without

Maximum SDS protection 10 MPa (1500 psi)

damage

CE Mark

85 to 264 VAC, 50/60 Hz, 25 VA max consumption and 12VDC, 1.2 A

15 to 35 °C To prevent product overheating, provide proper ventilation. Allow 10 cm

(4 in.) clearance from rear panel cooling fan.

- 20 to 70 °C Meets MIL-T-28800D 5 kg (11 lb) 10 cm H x 22.7 cm W x 24 cm D (3.9 in. x 9.3 in. x 9.5 in.) Motorola 68302, 16 MHz RS232 (COM1, COM2), IEEE-488.2

1 A, 250 VAC fuse, 5 x 20 mm, time lag type fuse Internal power supply fuse not replaceable by operator: 2.5A, 250 VAC

Lo Q-RPT Hi Q-RPT Qc (sea level)

Clean, dry, non-corrosive gas

AN-4 (37º flare) male

Included. Isolates Q-RPTs from Ps and Pt test ports and vents Q-RPTs to atmosphere.

A160K Q-RPT A350K Q-RPT

200 kPa abs (29 ipsi) 370 kPa abs (54 psi)

Available, must be specified

1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS

1.2.2.1 QUARTZ REFERENCE PRESSURE TRANSDUCERS (Q-RPT)

RPM4-AD includes two quartz reference pressure transducers (Q-RPT). Both are of the absolute (Axxx) type using an evacuated, permanently sealed reference. Axxx Q-RPTs are used to measure absolute, gauge and negative gauge pressure. Gauge pressure is defined by offsetting atmospheric pressure and applying dynamic compensation for atmospheric changes using the on-board barometer (see Section 3.2.2). Airspeed is calculated from the differential pressure between the

(Pt) and Lo (Ps) Q-RPTs or from gauge pressure (differential from current

Hi atmospheric pressure). See Section 3.3.3 for additional information on RPM4-AD measurement modes

n RPM4-AD A160K/A160K, the two Q-RPTs are sometimes used together in

I parallel measurement mode (//m corresponding to ambient atmospheric pressure, reducing the uncertainty on the measurement (see Section 3.2.5).

) to measure altitude or airspeed at altitude

1. INTRODUCTION

Table 1. Quartz Reference Pressure Transducer (Q-RPT)

module designations and ranges

Q-RPT

DESIGNATION

A350Ka1 (Pt)

A160Ka1(Ps or Pt)

MAXIMUM PRESSURE

[kPa]

Absolute

Gauge

350 250 51 36

160 60 23 8.7

MAXIMUM PRESSURE

[psi]

Absolute Gauge

GENERAL

Pressure Ranges

A160K/A160K 160 kPa abs (23 psi) 160 kPa abs (23 psi) 60 kPa (8.7 psi) A160K/A350K 160 kPa abs (23 psi) 350 kPa abs (51 psi) 250 kPa (36 psi)

Altitude Range

A160K/A160K - 4 000 to 20 000 m (- 13 000 to 66 000 ft) A160K/A350K - 4 000 to 30 000 m (- 13 000 to 100 000 ft)

Airspeed Range (sea level)

A160K/A160K 0 to 1020 km/hr (550 kts) A160K/A350K 0 to 2040 km/hr (1100 kts)

Resolution

Warm Up Time

Operating Temperature

Range

Acceleration Affect

Predicted Stability

Lo Q-RPT Hi Q-RPT Qc (sea level)

To 1 ppm, user adjustable

30 minute temperature stabilization recommended from cold power up for optimum performance.

15 to 35 °C

± 0.008 % /g maximum, worst axis Allows operation ± 20° from reference plane without significant effect

± 0.005% of reading

Note: the two Q-RPTs in RPM4-AD A160K/A160K can be compared one to the other to assist in identifying Q-RPT drift between calibrations

RPM4-AD A160K/A160K (rotary wing)

Precision

Measurement

Uncertainty

1. Predicted Q-RPT measurement stability limit (k=2) over one year assuming regular use of AutoZero function. AutoZero is performed by the operator: against zero pressure when vented in gauge mode, by direct comparison of one Q-RPT to the other at the line pressure in differential mode, by comparison with a barometric reference in absolute mode. Absolute mode predicted one year stability without AutoZ is ± (0.005 % Q-RPT span + 0.005 % of reading).

2. Combined linearity, hysteresis, repeatability. Add + 1 Pa (0.00015 psi) in gauge mode for the resolution and short term stability of the on-board barometer.

3. Maximum deviation of the Q-RPT indication from the true value of applied pressure including precision, predicted one year stability limit, temperature effect and calibration uncertainty, combined and expanded (k=2) following the ISO “Guide to the Expression of Uncertainty in Measurement.” Add + 1 Pa (0.00015 psi) when measuring airspeed and using the Lo Q-RPT to display altitude.

4. % of reading applies to 30 to 100 % of Q-RPT span. Under 30 % of Q-RPT span, the value is a constant which is the % of reading value times 30 %.

HL Q-RPT

(absolute, gauge)

Used for: altitude with

best uncertainty;

airspeed at ground

altitude only

± 0.004 % of reading or

2 Pa, whichever is

greater

± 0.006% of reading or

3 Pa, whichever is

greater

HI or LO Q-RPT

(absolute, gauge)

Used for: Not normally

used for air data

measurements

± 0.005 % of reading or

2.4 Pa, whichever is

± 0.008% of reading or

3.8 Pa, whichever is

greater

HI Q-RPT

(differential)

Used for: airspeed at

varying altitude

± 0.005 % of reading or

2.4 Pa, whichever is greater

± 0.008% of reading or

3 Pa, whichever is greater

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

RPM4-AD A350K/A160K (fixed wing)

Precision

Measurement

Uncertainty

2. Combined linearity, hysteresis, repeatability. Add + 1 Pa (0.00015 psi) in gauge mode for the resolution and short term stability of the on-board barometer.

4. % of reading applies to 30 to 100 % of Q-RPT span. Under 30 % of Q-RPT span, the value is a constant which is the % of reading value times 30 %.

LO Q-RPT (absolute, gauge) Used for: altitude

± 0.005 % of reading or

2.4 Pa, whichever is greater

± 0.008% of reading or

3.8 Pa, whichever is greater

1.2.2.2 ON-BOARD BAROMETER

The on-board barometer is used only to measure changes in atmospheric pressure to provide dynamic compensation of the Q-RPT’s atmospheric pressure offset when making gauge pressure measurements and when displaying altitude while measuring airspeed.

HI Q-RPT

(absolute, gauge)

Used for: airspeed at

ground altitude only

± 0.005 % of reading or

5.25 Pa, whichever is

± 0.008% of reading or

8.4 Pa, whichever is

greater

HI Q-RPT

(differential)

Used for: airspeed at

varying altitude

± 0.005 % of reading or

5.25 Pa, whichever is greater

± 0.008% of reading or

6.6 Pa, whichever is greater

1.2.3 BATTERY AND CHARGER PACK

Power Requirements

Operating Temperature Range

Storage Temperature Range

Vibration

Weight

Dimensions

Battery Type

Battery Voltage

Battery Capacity

Charge Time

Approx. Run Time, Full Charge

100 to 240 VAC, 50/60 Hz, 15 W max consumption

0 to 50 °C

- 20 to 50 °C

Meets MIL-T-28800D

2 kg (4.4 lb)

8 cm H x 22.5 cm W x 20 cm D (3.1 in. x 8.9 in. x 7.9 in.)

Nickel Metal-Hydride

12 VDC

Typical: 9000 mAh Min: 8200 mAh

Full charge from empty, 14 to 16 hours approx.

8 to 12 hours

2. INSTALLATION

22..

NNSSTTAALLLLAATTIIOON

2.1 UNPACKING AND INSPECTION

2.1.1 REMOVING FROM PACKAGING

RPM4-AD is delivered in a corrugated container with polyethylene inserts to hold it in place; or in the optional molded, medium density polyethylene shipping case with a custom foam insert for holding the RPM4-AD.

Remove the RPM4-AD and its accessories from the shipping container and remove each element from its protective plastic bag.

2.1.2 INSPECTING CONTENTS

Check that all items are present and have no visible damage.

A standard RPM4-AD includes all items indicated in Table 2.

Table 2. RPM4-AD packing list

DESCRIPTION PART #

1 ea. RPM4-AD Reference Pressure Monitor FAM008

1 ea. Calibration Report 550100

ACCESSORIES: 402294 (402294-CE)

1 ea. Operation and Maintenance Manual 550148

1 ea. Power Cord (7.5 ft.) 100770 (100770-CE)

1 ea. Ferrite sleeve (snap on to COM2 cable for CE) 103303

1 ea. General Accessories Disk (white CD) 102987

OPTIONAL BATTERY/CHARGER PACK 401904 (401904-CE)

1 ea. Battery/charger pack 401980

1 ea. Battery/charger pack to RPM4-AD cable 401979

1 ea. Power Cord (7.5 ft.) 100770 (100770-CE)

1 ea. Instruction Sheet 560062

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

2.2 SITE REQUIREMENTS

Install RPM4-AD on a flat, stable surface at a convenient height. The front feet can be extended so that the unit can be inclined for easier viewing. The RPM4-AD can also be mounted in a standard 19 in. rack using the optional rack mount kit.

2.3 SETUP

2.3.1 PREPARING FOR OPERATION

To prepare RPM4-AD for check out and operation:

Remove the plastic caps from the RPM4-AD rear panel pressure connections.

Remove the protective plastic sheet from the front panel display.

Familiarize yourself briefly with the front and rear panels (see Section 2.3.2).

2.3.2 FRONT AND REAR PANELS

2.3.2.1 FRONT PANEL

1. Ready/not ready indicator

2. Display

3. Remote activity indicator

Figure 1. Front panel

4. Cursor control keys

5. Multi-function keypad

2. INSTALLATION

2.3.2.2 REAR PANEL

1. 12VDC power supply connection

2. Remote [ENT] connector

3. IEEE-488 connector

4. COM2 connector

5. COM1 connector

6. Power switch

7. Fuse

2.3.3 POWER CONNECTION

2.3.3.1 85 TO 264 VAC, 50/60 HZ VAC POWER

Check that the RPM4-AD power switch is OFF.

Connect the supplied power cable to the rear panel power module.

Connect the other end of the power cable to an electrical supply of 85 to 264 VAC,

50/60 Hz.

2.3.3.2 BATTERY PACK

8. Electrical power connector (IEC-320-C13)

9. Fan

10. Product label (bottom of case)

11. TEST (Ps), low Q-RPT

12. TEST (Pt), high Q-RPT

13. ATM port

14. VENT port

Figure 2. Rear panel

Charge the battery pack fully (see Section 3.2.9).

Connect the RPM4-AD 12VDC power connection on the rear panel of the

RPM4-AD to the 12 VDC power connection on the battery/charge pack using the cable supplied with the pack.

See Section 3.2.9 for additional information on battery/charger pack

operation and maintenance.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

2.3.4 REMOTE [ENT] CONNECTION (FOOTSWITCH OR OTHER SWITCH)

Connect the optional remote ENTER footswitch, if available or a user supplied switch fitted to the optional cable (see Section 7.1). Connect the cable to the RPM4-AD rear panel connection labeled REMOTE ENTER. Closing the switch is equivalent to pressing the [ENT] key on the front panel (see Section 3.1.3).

2.3.5 CONNECTING TO MEASURE PRESSURE (PS AND PT PORTS)

Using a pressure connecting hose or tube of appropriate pressure rating, connect the device or system to be tested to the RPM4-AD TEST (Pt) and/or TEST (Ps) ports.

The RPM4-AD TEST (Pt) and TEST (Ps) connections are AN4 (1/4 in.) male.

See Table 3 for instructions on how to connect to the RPM4-AD TEST ports depending on what is to be measured. See Section 5.6 for schematics of RPM4-AD TEST ports and internal valve configurations. Typically, when testing an air data device, the air data device Ps port is connected to the RPM4-AD Ps port and the air data device Pt port is connected to the RPM4-AD Pt port.

, Q-RPTs

Table 3. Making pressure connections to RPM4-AD

MEASUREMENT

Airspeed at varying altitude (true Ps and Pt differential operation)

Altitude only, best uncertainty

and

absolute pressure

Airspeed at ground altitude only (A160K/A160)

and

gauge pressure

Gauge pressure

negative gauge pressure

RPM4-AD A160K/A160K RPM4-AD A350K/A160K TYPE OF

TEST(Pt) TEST(Ps) VENT TEST(Pt) TEST(Ps) VENT

Connect to DUT Pt port

Not used. May be connected to DUT Pt port

Connect to DUT Pt port

Connect to DUT (+) or gauge port

Connect to DUT Ps or altitude port

Connect to DUT

Ps, altitude or abs port

Not used. May be connected to DUT or Ps port

Not used Connect

Not used Connect to

Not used Not used.

Not used. May be connected to DUT or Ps port

to DUT (-) port (optional)

DUT Pt port

May be connected to DUT Pt port

Connect to DUT Pt port

Connect to DUT (+)or gauge port to measure with Hi Q-RPT

Connect to DUT Ps or altitude port

Connect to DUT Ps,

altitude or abs port

Not used. May be connected to DUT or Ps port

Connect to DUT (+)or gauge port to measure with Lo Q-RPT

Not used

Connect to DUT (-) port (optional)

RPM4-AD includes the SDS Self Defense System on both of its Q-RPTs. SDS, operated

properly, allows a the Q-RPT TEST port to be left connected to a pressure up to 10 MPa (1 500 psi) without damage to the Q-RPT. Do NOT attempt to use SDS in this manner without first becoming thoroughly familiar with its operation and limitations (see Sections 3.2.8, 3.3.8, 3.5.4).

2. INSTALLATION

Using the RPM4-AD connected to a system with liquid contaminants without taking

proper precautions to purge the system and test line may cause contamination of the RPM4-AD that will require non-warranty service.

2.3.6 THE VENT AND ATM PORTS

The RPM4-AD Hi Q-RPT module has a VENT port. The VENT port is connected to the Q-RPT

Self Defense System (SDS) Q-RPT vent valves. The VENT port should always be left completely unobstructed and open to ambient atmospheric pressure.

RPM4-AD Lo Q-RPT module has an ATM port. The ATM port is connected to the RPM-AD internal barometer. The VENT port should always be left completely unobstructed and open to ambient atmospheric pressure. When operating RPM4-AD A160K/A160K in parallel gauge pressure mode to measure airspeed, the vent port may be connected to the DUT Ps or altitude port to assure that the RPM4 and the DUT are at the same altitude setting. In this case, altitude must remain between -700 and 3000 m (110 to 70 kPa abs).

See Section 5.6 for schematics of RPM4-AD TEST and VENT ports, Q-RPT and internal valve configurations.

NEVER plug, obstruct or connect a supply pressure to an RPM4-AD VENT port. This will

adversely affect GAUGE mode operation and AutoZeroing functions.

2.3.7 CHECK/SET SECURITY LEVEL

RPM4-AD has a security system based on user levels. By default, the security system is set to “low”, which includes access restriction to internal calibration coefficients, and there is no password required to change the security level. See Section 3.5.5.5 for information on the security level system. As part

of the RPM4-AD startup, determine the security level that is

appropriate for the RPM4-AD and set a password if desired.

RPM4-AD is delivered with the security level set to “low” to avoid inadvertent altering of

critical internal settings but with access to changing security levels unrestricted. It is recommended that the low security level be maintained at all times and password protection be implemented if control over setting of security levels is desired.

2.3.8 SDS FULL TIME OFF

RPM4-AD includes the SDS Self Defense System on both its TEST ports to shut them off from a pressure connected to them when they are not in use. If this function is not desired, SDS can be turned full time off so that in regular operation, SDS is not present. With SDS full time off, the SDS overpressure protection is still active.

See Section 3.5.4.2 for instructions on turning SDS full time off if desired.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

2.4 POWER-UP AND VERIFICATION

2.4.1 SWITCH POWER ON

Actuate the power switch on the RPM4-AD rear panel (if a 12 VDC power supply is already connected to the 12 VDC connection, RPM4-AD power is already on). Observe the front panel display as RPM4-AD initializes, error checks and goes to the MAIN RUN screen (see 3.1.1).

If the RPM4-AD fails to reach

the MAIN RUN screen, service is required. Record the

sequence of operations and displays observed.

SDS is CLOSED at power up and the TEST ports are shut off. This causes <SDS

CLOSED> to be flash periodically in the MAIN RUN screen in place of the measured pressure value.

2.4.2 CHECK PRESSURE MEASUREMENT OPERATION

2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT

Check the RPM4-AD operates properly in absolute mode.

Make sure that the TEST (Ps) and TEST (Pt) ports are vented to atmosphere.

Press the [MODE] function key and select <absolute> mode (see Section 3.3.3). Use [UNIT] to s

If SDS is the top line of the display), Press [SDS], <2yes> to OPEN SDS (see Section 3.3.8).

Do NOT OPEN SDS with a pressure higher than the maximum pressure of the

Q-RPT applied to the TEST port. Damage to the Q-RPT may result.

elect a pressure unit of measure (not altitude) (see Section 3.3.2).

CLOSED (<SDS CLOSED> flashes over the display of pressure on

The RPM4-AD should be measuring the current value of atmospheric pressure. Check that the value agrees with the local value of atmospheric pressure within measurement tolerances (see Section 1.2.2.1). If RPM4-AD does not agree within tolerance, it may need to be AutoZeroed (see Section 3.3.9), calibrated (see Section 5.2) or repaired.

2.4.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT

Check the RPM4-AD operates properly in gauge mode.

Make sure that the TEST (Ps) and TEST (Pt) ports are vented to atmosphere.

Press the [MODE] function key and select <gauge> mode. Use [UNIT] to select a pressure unit of measure (not airspeed) (see Section 3.3.2).

If SDS is top line of the display), OPEN SDS. Press [SDS], <2yes> to OPEN SDS.

CLOSED (<SDS CLOSED> flashes over the display of pressure on the

Do NOT OPEN SDS with a pressure higher than the maximum pressure of the

Q-RPT applied to the TEST port. Damage to the Q-RPT may result.

2. INSTALLATION

The value indicated should be near zero. It is normal for RPM4-AD to indicate a value other than zero when vented when gauge mode is first entered or the range is changed. Press [AutoZ]. This runs AutoZ to zero the Q-RPT reading (see Section 3.3.9.1). Upon return to the MAIN RUN screen, observe that the indication of measured pressure has zeroed.

If the display fails to zero properly, RPM4-AD may need repair.

2.5 SHORT TERM STORAGE

The following is recommended for short term storage of RPM4:

Remove pressure from the RPM4-AD TEST ports.

Switch power OFF.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

OOTTEES

3. OPERATION

33..

PPEERRAATTIIOON

3.1 USER INTERFACE

RPM4-AD is designed to offer a balance between simple, straight forward operation and the availability of a wide variety of advanced functions with a high level of operator discretion. The local operator interface is through a 2 x 20 character alphanumeric display, a function/data keypad, a cursor control pad and a Ready/Not Ready indicator.

Remote communications are by RS232 (COM1) and IEEE-488. See Section 4 for information on remote communication.

3.1.1 MAIN RUN SCREEN

The RPM4-AD MAIN RUN screen is its home display that is reached on power-up and from which other functions and menus are accessed. It is the very top level of all menu structures.

The MAIN RUN screen is where RPM4-AD is left in normal operation. It displays the current measured pressure, altitude and/or airspeed as well as a variety of additional information if desired.

Figure 3 and its legend summarize the RPM4-AD MAIN RUN screen fields and their functions.

RPM4-AD has a screen saver function which causes the display to dim if no key is pressed for

10 minutes. Pressing a key restores full power to the display. The screen saver time can be changed or screen saving can be completely suppressed (see Section 3.5.5.1).

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

PRESSURE1UNITM hzRR

DDISPLAYFUNCION

DISPLAY FIELD NAME PURPOSE CONTENTS SECTION

1. PRESSURE1 Measured pressure, altitude or airspeed

2. UNIT Unit of measure

Displays value measured by the active Q-RPT(s)

Identifies unit of measure in which

Numerical pressure value and sign.

3.2.8 Intermittently flashes <SDS CLOSED> when the Q-RPT is shut off from the TEST port by SDS.

Unit of measure abbreviation 3.3.2

pressure or pressure derived values are displayed

3. M Measurement mode

4. h Head indicator

Identifies measurement mode of displayed pressure or air data value

Indicates whether a fluid head correction

<a> absolute <g> gauge or negative gauge <d> differential

<h> the fluid head is not zero <blank> fluid head is zero

3.3.3

3.3.7

is applied to PRESSURE1

5. z AutoZero indicator

Indicates whether the AutoZero function is

<z> AutoZ is ON <blank> AutoZ is OFF

3.5.1

ON or OFF for the active Q-RPT and measurement mode

6. RR Active Q-RPT indicator

Indicates the active Q-RPT in the RPM4. The active Q-RPT measurement is displayed on the RPM4 top line.

<Hi> Hi Q-RPT <Lo> Lo Q-RPT <HL> Hi and Lo Q-RPTs together in

parallel measurement mode (A160K/A160K only)

<Hd> Hi and Lo Q-RPTs together in

3.2.1

differential measurement mode

8. DISPLAY

FUNCTION

Information specific to the DISPLAY mode

Pressure indication depending on current RPM4-AD DISPLAY function. Leading

Numerical pressure value

and sign.

3.3.6

character identifies the value

9. D Pressure information indicator

Pressure information indicator depending on current RPM4-AD DISPLAY function.

<σ> Display mode is AVERAGE

and value is standard deviation

<R> Display mode is RATE and

value is pressure or air data

3.3.6

unit rate of change per second

</s> or per minute </m>

<H> Display mode is HI/LO and

values high (left), low (right)

<D> Display mode is DEVIATION

and value is difference from current target

None Display mode is RPT and value is

measurement of inactive RPT (<Lo> or <Hi> to right)

<F> Display mode is FREEZE and

value is last captured reading

Blank, no character Current display

mode is CLEAN

Figure 3. MAIN RUN screen display fields

3. OPERATION

3.1.2 FUNCTION / DATA KEYPAD LAYOUT AND PROTOCOL

The RPM4-AD has a function/data keypad for local operator access to direct functions, function menus and for data entry.

1. The Function/Data keys allow very commonly used functions to be accessed directly by a single keystroke when pressed from the MAIN RUN screen (see Section 3.1.1). The name of the function is on half of the key. These keys enter numerical values when editing.

2. The Editing and Execution keys are for starting and suspending command execution, cursor control in menus and editing entries.

the bottom

3. The Menu/Data keys provide access to function menus when pressed from the MAIN RUN screen. The menu name is on the bottom half of the key. The SETUP menu is for more frequently used functions (see Section 3.4). The SPECIAL menu is for functions that are not generally of day to day operation (see Section 3.5). These key

s enter numerical values when editing.

used as a part

Figure 4. Keypad layout

Pressing the [ENT] key generally causes execution or forward movement in the menu tree.

Pressing the [ESC] key moves back in the menu tree and/or causes execution to cease or suspend. Pressing [ESC] repeatedly eventually returns to the MAIN RUN screen and, from there, allows momentary viewing of the RPM4-AD introduction screen.

Pressing the [+/-] key changes a numerical sign when editing. It also toggles through multiple screens when available and, from some run screens, is a shortcut to a momentary display of active RANGE.

Pressing the [

], [ ], [ ] and [ ] keys allows up, down, reverse and

forward cursor movement when editing data entry or moving in menus.

Some screens go beyond the two lines provided by the display. This is

indicated by a flashing arrow in the second line of the display. Press the cursor control keys to move the cursor to access the lines that are not visible or directly enter the number of the hidden menu choice if you know it.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

3.1.3 REMOTE [ENT] (ENTER) FOOTSWITCH

The optional remote ENTER function is a switch that duplicates the function of the front panel [ENT] key. The remote ENTER function is serviced by a connector on the RPM4-AD rear panel. An optional footswitch is available to activate remote entry hands free or a different switch may be used. See Section 7.1 for information on remote ENTER switch wiring.

3.1.4 SOUNDS

RPM4-AD is equipped with a variable frequency tone device to provide audible feedback and alarms. The beeper is used for the following indications.

Valid key press

Brief beep. Choice between three frequencies or NO sound is available (see Section 3.5.5.2).

alid key press

Inv

Leak check completed

Upper or low

Pmax! (ov

er limit exceeded

erpressure limit)

Descending two tone “blurp”

Three two second beeps (see Section 3.3.5).

Intermittent one second beeps (see Section 3.4.4).

Eight second high frequency beep (see Section 3.4.4.1).

exceeded

Possible disconnect betw

een

Rapid beeps for 8 seconds (3.2.5).

the Hi and Lo Q-RPTs in parallel measurement mode

3.2 GENERAL OPERATING PRINCIPLES

3.2.1 Q-RPTS AND Q-RPT SELECTION

RPM4-AD has two Q-RPTs. In RPM4-AD A160K/A160K the two Q-RPTs have of the same range of 160 kPa absolute (23 psi). In RPM4-AD A350K/A160K the Hi Q-RPT has a range of 350 kPa (51 psi) and the Lo Q-RPT has a range of 160 kPa (23 psi). Position indication of the currently active Q-RPT is continuously displayed in the upper right hand corner of the MAIN RUN screen and most other screens. See Section 5.6 for a schematic of the RPM4-AD pneumatic system and Q-RPTs. in an RPM4-AD.

See Table 4 for position designation protocol for the Q-RPTs

Table 4. Position designators of Q-RPTs in an RPM4-AD system

Q-RPT POSITION DISPLAY SYMBOL*

A160K/A160K: A160K Q-RPT installed in HIGH RPT (Pt) position.

A350K/A160K: A350K Q-RPT installed in HIGH RPT (Pt) position.

Hi Q-RPT when used in differential measurement mode (Hi – Lo)

A160K/A160K: A160K Q-RPT installed in LOW RPT (Ps) position.

A350K/A160K: A160K Q-RPT installed in LOW RPT (Ps) position.

Both Q-RPTs being used simultaneously in parallel measurement mode (RPM4AD A160K/A160K only)

* The display symbol is included in the upper, right hand corner of most RPM4-

AD menu displays as a convenient indicator of the active Q-RPT.

<Hi>

<Hd>

<Lo>

<HL>

3. OPERATION

AN RPM4-AD Q-RPT is identified by a range screen identifying the Q-RPT, its current unit of measure and its full scale pressure in gauge and absolute measurement modes or in an air data unit. The Q-RPT screen is:

1. Q-RPT designator.

2. Q-RPT position designator.

3. Current pressure unit of measure.

4. Full scale pressure in current unit of measure in gauge (<g>) and/or absolute (<a>) measurement mode.

Active A160K Hi inHg 17.7g/47.2a

The Q-RPTs available on an RPM4-AD and short cuts to specific air data measurement modes are accessed using [RANGE].

Most settings made when an RPM4-AD Q-RPT is active, such as unit of measure, measurement mode, display resolution, and stability setting are specific to the Q-RPT. Generally, settings selected while one Q-RPT is active apply to that Q-RPT and not to the other Q-RPT. The Q-RPT specific settings are stored with the Q-RPT and recalled whenever the Q-RPT is made active. See Table 5 for a listing of RPM4-AD settings and to what level of RPM4-AD operation they are specific.

Table 5. Settings and what they are specific to

(range, measurement mode, Q-RPT, system)

SETTING PURPOSE SPECIFIC TO SECTION

[Unit]

[Mode]

[Display]

[Head]

[SDS]

[AutoZ]

Resolution Set pressure display resolution Q-RPT 3.4.2

Stability Set Ready/Not Ready stability test. Q-RPT 3.4.3

Upper Limit Set upper and lower pressure limit alarm Q-RPT and measurement mode 3.4.4

AutoZ AutoZ ON/OFF, set and view values Q-RPT and measurement mode 3.5.1

Screen Saver, Sound, Time, ID, Level

ReadRate Automated read rate adjustment ON/OFF System 3.5.7.2

Cal Q-RPT and barometer calibration coefficient

Set pressure unit of measure Q-RPT and measurement mode 3.3.2

Set pressure measurement mode (absolute, gauge, negative gauge)

Set bottom line display function System 3.3.6

Set fluid head correction height, fluid, unit of measure

Open and close SDS Q-RPT 3.3.8

Run AutoZ Q-RPT and measurement mode 3.3.9

Set system user preferences System 3.5.5

and date viewing and editing

Q-RPT 3.3.3

System 3.3.7

Q-RPT or barometer 3.5.7.5

3.2.2 GAUGE AND NEGATIVE GAUGE MEASUREMENT, DYNAMIC COMPENSATION FOR ATMOSPHERIC PRESSURE

RPM4-AD Q-RPTs are intrinsically absolute but they are also used for gauge and negative gauge measurement modes (see Section 3.3.3,  achieved by subtracting the value of atmospheric pressure, P reading using AutoZ (see Section 3.2.2). The AutoZ routine that measures P

PRINCIPLE). Gauge measurement modes are

, from the Q-RPT’s absolute

offset,G

, is run by

offset,G

pressing [AutoZ] whenever RPM4-AD is in the vented condition. This assures the continuous

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

updating of the P measured absolute pressure, P

value corresponding to atmospheric pressure. Gauge pressure is the

offset,G

, minus the atmospheric offset.

gauge

= Pu - P

offset,G

However, atmospheric pressure may change between opportunities to run AutoZ and update the value of P

, for example when running an extended test without venting. RPM4-AD

offset,G

uses dynamic compensation for atmospheric pressure to correct for changes in atmospheric pressure between opportunities to run AutoZ and update P runs, and P

is determined, the reading of RPM4’s on board barometer, P

offset,G

recorded. Later, when no longer vented, the change in atmospheric pressure, ΔP P

barometer reading at the time of AutoZ execution, P

Dynamic compensation for atmospheric pressure uses ΔP

was updated, is the difference between the current barometer reading, P

offset,G

atm,0

ΔP

= P

atm

- P

atm,0

to correct the value of P

atm

. When AutoZ

offset,G

atm,0

, is also

, since

atm

, and the

atm

offset,G

thus always compensating real time for changes in atmospheric pressure:

gauge

= Pu - P

offset,G

- ΔP

atm

Gauge pressure measurement on an Axxx (absolute) Q-RPT allows instantaneous switching between gauge and absolute measurements modes. The additional uncertainty in gauge pressure mode due to the dynamic compensation for atmospheric pressure technique is a function of the resolution and short term stability of the on-board barometer, not its absolute measurement uncertainty. This additional uncertainty is ± 1 Pa (0.00015 psi).

In RPM4-AD A160K/A160K the two A160K Q-RPTs are used in parallel measurement

mode in gauge mode to reduce measurement uncertainty (see Section 3.2.5). Gauge mode can be used to measure airspeed in parallel measurement mode. This provides airspeed measurement but only at ground altitude corresponding to the current value of atmospheric pressure (see Section 3.2.3.1).

3.2.3 ALTITUDE AND AIRSPEED MEASUREMENT

RPM4-AD is designed to support the measurement of altitude and airspeed with minimal uncertainty. See Section 3.2.3.1 for information on altitude and airspeed measurement RPM4-AD A160K/A160K (rotary wing) and Section 3.2.3.2 for information on RPM4-AD A350K/A160K (fixed wing).

3.2.3.1 RPM4-AD A160K/A160K (ROTARY WING)

RPM4-AD A160K/A160K has two 160 kPa absolute Q-RPTs, one in the HIGH RPT (Pt) position and one in the LOW RPT (Ps) position.

Air data measurements can be made in three different conditions.

The two Q-RPTs measuring two absolute pressures (Ps and Pt) separately: airspeed at varying altitude

In differential mode, the two Q-RPTs are separated internally. One is connected to the TEST (Ps) port and the other is connected to the TEST (Pt) port (see Section 3.2.6).

RPM4 ports. The absolute pressure measured on the TEST (Ps) port is converted to altitude. The difference between the TEST (Pt) and TEST (Ps) pressure (Pt - Ps) is converted to airspeed (see Section 7.2.3). If a true airspeed unit of measure has been selected, altitude and entered the airspeed calculation.

measures the absolute pressures applied to the TEST (Ps) and TEST (Pt)

temperature are also used in

with

3. OPERATION

To measure airspeed and altitude using this mode, use [RANGE] (see Section

3.3.1.1) t

o select the <Hi> Q-RPT or the <airspeed & altitude> shortcut. If the shortcut is not used, once the Q-RPT has been selected, use [MODE] (see Section 3.3.3) to set absolute and differential measurement mode and [UNIT] (see Section 3.3.2) to set the desired airspeed unit. Use [DISPLAY], <4RP

T> to

change the altitude unit if desired.

The two Q-RPTs measuring absolute pressure in parallel: Altitude only, with lowest uncertainty

In parallel mode (//m

), the two Q-RPTs are connected together internally, the TEST (Ps) port is opened and the TEST (Pt) port is closed using the SDS valves.

RPM4 measures the absolute pressure applied to the TEST (Ps) port with both Q-RPTs and averages the two (see Section 3.2.5). The absolute pressure is converted to altitude (see Section 7.2.2).

To measure altitude using this mode, use [RANGE] (see Section 3.3.1) t

o select the <HL> Q-RPT or the <altitude, parallel> shortcut. If the shortcut is not used, once the Q-RPT has been selected, use [MODE] (see Section 3.3.3) to set absolute measurement mode and [UNIT] (see Section 3.3.2) to set the desired altitude unit.

The tw

o Q-RPTs measuring gauge pressure in parallel: Airspeed at ground

altitude only

In parallel mode, the two Q-RPTs are connected together internally, the TEST (Pt) port is opened and the TEST (Ps) port is closed using the SDS valves.

RPM4 measures the gauge pressure applied to the TEST (Pt) port with both Q- RPTs and averages the two (see Section 3.2.5). Since the gauge pressure is the difference

from atmospheric pressure, it directly provides the differential pressure used to calculate airspeed. The value of static pressure, Ps, is the current value of atmospheric pressure. The gauge pressure is converted to airspeed (see Section 7.2.3). The value of ground altitude corresponding to ambient atmospheric pressure can also be displayed.

If a true airspeed unit of measure has been selected, altitude and entered temperature are also used in the airspeed calculation.

To measure airspeed using this mode, use [RANGE] (see Section 3.3.1.1) to

the <HL> Q-RPT or the <airspeed, parallel> shortcut. If the shortcut is

select not used, once the Q-RPT has been selected, use [MODE] (see Section 3.3.3) to

gauge measurement mode and [UNIT] (see Section 3.3.2) to set the desired

set airspeed unit.

3.2.3.2 RPM4-AD A350K/A160K (FIXED WING)

RPM4-AD A350K/A160K has two Q-RPTs. A 350 kPa absolute Q-RPTs is in the HIGH RPT (Pt) position and a 160 kPa absolute is in the LOW RPT (Ps) position.

Air data measurements are normally made in the following conditions:

The two Q-RPTs are separated internally. One is connected to the TEST (Ps) port and the other is connected to the TEST (Pt) port.

RPM4 measures the absolute pressures applied to the TEST (Ps) and TEST (Pt) ports. The absolute pressure measured on the TEST (Ps) port is converted to altitude. The difference between the TEST (Pt) and TEST (Ps) pressure (Pt – Ps) is converted to airspeed (see Section 7.2.3). If a true airspeed unit of measure has been selected, altitude and entered the airspeed calculation.

temperature are also used in

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

To measure airspeed and altitude using this mode, use [RANGE] (see Section

3.3.1.2) t

3.2.4 PRESSURE READY/NOT READY

There is a Ready/Not Ready indication LED on the RPM4-AD front panel. This indication is intended to provide the user with an objective indication of when a stable pressure has been achieved. Ready is indicated when the current stability (rate of change) of pressure is less than the stability limit. The user can set the stability limit (see Section 3.4.3). The ready indication valid reading can be made.

The Ready/Not Ready LED indications are:

is often used when comparing the RPM4-AD and a test device to indicate when a

The Ready/Not Ready indication always applies to the active Q-RPT, whose pressure

measurement is displayed on the top line of the RPM4-AD display.

T> to

<Green > Pressure Ready The pressure stability is within the stability limit. <Red> Pressure Not Ready The pressure stability is NOT within the stability limit.

In differential measurement mode (see Section 3.2.6), the LED Ready/Not Ready

indication applies to the differential pressures.

In parallel measurement mode (see Section 3.2.5), the LED Ready/Not Ready indication

applies to the average pressure read by the <HL> Q-RPT

The Ready/Not Ready LED indications are:

<Green > Pressure Ready The pressure stability is within the stability limit. <Red> Pressure Not Ready The pressure stability is NOT within the stability limit.

The default stability limit criteria for the Ready/Not Ready determination is:

Absolute measurement mode: ± 0.001875% of absolute mode span

Gauge measurement mode: ± 0.005% of gauge mode span

3.2.5 PARALLEL MEASUREMENT MODE (//MTM) (RPM4-AD A160K/A160K ONLY)

RPM4-AD A160K/A160K can be set to operate in parallel measurement mode. Parallel measurement mode is used to measure altitude with the lowest uncertainty (see Section 3.2.3.1).

Parallel measurement mode is intended to improve measurement reliability and reduce measurement uncertainty by using the

measurements of two Q-RPTs together. In parallel measurement

mode, the measured pressure is the average of the readings of the two Q-RPTs.

Parallel measurement mode is considered a Q-RPT designated <HL> (combination of Hi and Lo). The HL Q-RPT can be selected using the [RANGE] (see Section 3.3.1.1) key and operated

with all the features of a Hi or Lo Q-RPT.

In parallel measurement mode the active TEST port depends upon the measurement mode. In absolute measurement mode the TEST(Ps) port is active and the TEST(Pt) port is shutoff. In gauge measurement mode the TEST(Pt) port is active and the TEST(Ps) port is shutoff.

3. OPERATION

3.2.6 DIFFERENTIAL MEASUREMENT MODE

RPM4-AD can be set to operate in differential measurement mode. Differential measurement mode is used to measure airspeed and varying altitude (see Section 3.2.3).

In differential measurement mode, the measured pressure is the measurements of the two Q-RPTs (Hi – Lo, Pt – Ps).

To set up differential measurement mode, use [RANGE] (see Section 3.3.1) to select the

<Hi

> Q-RPT or the <airspeed & altitude> shortcut. If the shortcut is not used, once the

Q-RPT has been selected, use [MODE] (see Section 3.3.3) to set absolute and differential measurement mode.

difference between

3.2.7 AUTOZERO FUNCTION

RPM-AD includes an AutoZero function. This function is used to rezero the Q-RPT readings in gauge and differential modes and to offset the Q-RPT relative to a reference standard in absolute mode.

See Section 3.5.1 for complete information on the AutoZ function.

In gauge measurement mode, AutoZ should be run when the mode time RPM4-AD is vented (zero gauge pressure applied) (see Section 3.3.9.1).

In differential measurement mode, selected and any time zero differential is set or the line pressure (altitude) is changed (see Section 3.3.9.3).

In absolute measurement mode, it is recommended that AutoZ be run e when RPM4-AD has been exposed to temperature changes exceeding 15 ºC (36 ºF) (see Section 3.3.9.2).

the AutoZ function should be run when the mode is first

is first selected and any

very 30 days or

3.2.8 SDS SELF DEFENSE SYSTEM

The RPM4-AD Q-RPTs modules are equipped with the SDS self defense system. The SDS system includes hardware and embedded software to isolate Q-RPTs from overpressure. When SDS is CLOSED for a Q-RPT module, the Q-RPT is isolated from the module’s TEST port and opened to the module’s VENT port (See Section 5.6, Figure 8, Figure 9).

SDS can be OPENED and CLOSED from the front panel using [SDS]. SDS can also be controlled using functions under [SPECIAL], < allows SDS on both Q-RPTs and TEST ports, whether active or inactive, to be opened and closed directly (see Section 3.5.4.1). The SDS “full time on/off” func opened permanently so the RPM4-AD can be operated as if SDS were not installed (see Section 3.5.4.2).

SDS is normally used to isolate an RPM4-AD sometimes be subjected to pressures higher than the Q-RPT’s maximum pressure. When configuring a multi-range system, this can eliminate the need for external valving or connecting and disconnecting RPM4s. For example, two Q-RPTs of different ranges might be connected to a single calibration system. When the Hi Q-RPT is in use, SDS is closed on the Lo Q-RPT to protect it from overpressure. When used in this manner, SDS should be CLOSED prior to applying pressure. Automatic SDS closing in response to overpressure should only be used in an emergency overpressure situation.

SDS also attempts to protect Q-RPTs from accidental overpressure. Whenever RPM4-AD is powered ON it continuously monitors the pressure read by its Q-RPT(s). If the pressure reaches the maximum pressure limit for a Q-RPT, SDS CLOSES to isolate the Q-RPT from the TEST port and vent it to atmosphere. This is not a fail safe overpressure system. It does not protect against very rapid overpressure or pressure exceeding 10 MPa (1 500 psi).

4SDS>. The SDS “temp open/close” function

tion allows SDS to be

Q-RPT from a test system which may

See Section 5.6 for schematics of the RPM4-AD indication of internal valve states for SDS open and closed.

Q-RPTs and pneumatic system and

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

The maximum pressure that should be applied to an RPM4-AD TEST port when SDS is

CLOSED is 10 MPa (1 500 psi).

Though the SDS self defense system includes features to automatically protect Q-RPTs

against accidental overpressure, SDS should NOT be considered a fail-safe overpressure protection system. SDS cannot guarantee that overpressure damage will NOT occur. Conventional measures for overpressure protection should also always be used. Damage to Q-RPTs due to overpressure is NOT covered by the RPM4-AD product warranty even when SDS is present and ON.

3.2.9 USE OF THE 12VDC BATTERY/CHARGER PACK

An optional 12VDC battery/charger pack is available to supply power to RPM4-AD’s 12VDC power connection.

The battery/charger pack combines the battery and the battery charger.

To Charge the Battery

The battery may be charged while the battery/charge pack is connected to the RPM4-AD.

To charge the battery, connect the battery/charger pack to a 100 to 240 V, 50/60 Hz power supply using the supplied power cable and turn on the charger power switch. The green CHARGE indicator light goes on to indicate that battery charging is in progress. Allow 14 to 16 hours for the battery to charge fully. When the battery is fully charged, the CHARGE indicator light flashes.

When the battery charger power switch is in the ON, the battery is connected to the charger, not the 12VDC output. When the battery charger switch is in the OFF position, the CHARGE indicator light goes off, and 12VDC is supplied on the 12VDC connection.

To Use the Battery/Charger Pack to Supply RPM4

After charging the battery, connect the 12VDC connection of the battery/charger pack to the 12VDC connection on the RPM4-AD rear panel.

Turn the battery/charger pack power switch to OFF (when AC power is connected to the battery/charger pack, the power switch must be OFF for 12VDC power to be output).

When RPM4-AD is connected to both a 12 VDC source and an AC source, if the RPM4-AD power switch is OFF, the 12VDC source supplies the RPM4; if the RPM4-AD power switch is ON, the 12 VDC source is disconnected and the AC source supplies the RPM4-AD.

To Check the Battery Charge Level

To check the current charge level of the battery, press the toggle switch on the battery/charger pack front panel. Observe the BATTERY CHECK indicator lights. All three lights are lit when battery is fully charged. If no light or one light is on, the battery should be recharged.

3. OPERATION

Figure 5. Battery pack/charger

3.2.10 USING RPM4-AD WITH A PPC3 CONTROLLER/CALIBRATOR

Certain RPM4 models can be used as an external measurement device for a PPC3 pressure controller/calibration.

RPM4-AD cannot be used as a PPC3 external measurement device.

3.2.11 DIRECT FUNCTION KEYS SUMMARY

Table 6 provides a brief summary of direct function key operation. It may be useful to

keep a copy of this summary near the RPM4-AD, especially when first becoming acquainted with its operation.

Local operation of RPM4-AD is through the front panel keypad. To minimize multi-layered menu structures, the keypad numerical keys also provide direct access to the most commonly used functions. The function accessed is labeled on the bottom half of the key. Direct function keys are active whenever RPM4-AD is in its MAIN RUN screen. Table 6 summarizes the operation of the direct function keys.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

Table 6. Summary of RPM4-AD function key operation

DIRECT FUNCTION KEYS ARE ACTIVE FROM THE MAIN RUN SCREEN

See corresponding manual sections for full detail.

Adjust height of fluid head correction. Set to zero to defeat correction.

SDS controls the connection of the Q-RPT to the TEST(Pt) and/or TEST(Ps) port. Closes any open SDS. Opens SDS of active QRPT if closed.

Run the AutoZ function to AutoZero the active Q-RPT and measurement mode.

View and toggle through active QRPT and setup shortcuts. [ENT] on a Q-RPT or shortcut activates it.

Select pressure unit of measure for the active range. Choice of units available in this menu depends on current measurement mode. Choice of units can be customized.

Select the pressure measurement mode for the active Q-RPT (absolute, gauge, negative gauge, differential).

This function is not used in RPM4AD models.

Run automated leak checking routine, also used for average rate measurements (e.g. ascent, descent).

Select the display function for the bottom line of the RPM4-AD display.

3.3 DIRECT FUNCTION KEYS

3.3.1 [RANGE]

 PURPOSE

To view and/or change the active Q-RPT and associated settings. Includes direct shortcuts to air data measurement modes.

 PRINCIPLE

RPM4-AD has two Q-RPTs.

In RPM4 A160K/A160K, the two Q-RPTs may be used in parallel (<HL>) or the Hi Q-RPT may be used alone (<Hi>) or in true differential mode with the Lo Q-RPT (<Hd>).

Menu of less commonly used internal functions and settings.

Menu of commonly used setup features including set display resolution, set stability limit.

Start or set functions such as Leak Check and Freeze. ENTER values when editing.

In RPM4 A350K/A160K, the Hi Q-RPT (<Hi>) or the Lo Q-RPT (<Lo>) may be used individually. Differential use of the two Q-RPTs is accessed by selecting the Hi Q-RPT (<Hd>). Parallel mode of the two Q-RPTs is not supported.

The [RANGE] function key is used to specify which Q-RPT (and associated range and settings) is active.

To streamline RPM4-AD operation, the [RANGE] key also provides simple shortcuts to the RPM4-AD configurations that support air data measurements.

See Section 4.4.5 for procedures to accomplish the same air data setups as [RANGE]

shortcuts using remote commands.

3. OPERATION

 OPERATION

Pressing the [RANGE] function key activates the Q-RPT viewing and selecting function. When the [RANGE] function key is first pressed, the active Q-RPT is displayed. For example:

1. Q-RPT designator.

2. Q-RPT position designator (<Hi>, <Lo>, <HL> for both Q-RPTs in parallel mode, <Hd> for Hi Q-RPT in differential mode with the Lo Q-RPT).

3. Current unit of measure.

4. Full scale pressure of Q-RPT in current unit of measure in gauge (<g>) and absolute (<a>) measurement modes for pressure unit of measure or in air data unit.

Active A160K Hi kPa 60g/160a

Pressing the [RANGE] key again while in the RANGE functions toggles through displays of the other available Q-RPTs and shortcuts to air data measurement configurations (see below for

RPM4-AD A160K/A160K and RPM4-AD A350K/A160K [RANGE] key choice details). The [ and [

] keys can also be used to move forwards or backwards through the selections.

To select a Q-RPT or shortcut, press [ENT] when it is displayed.

Pressing [ESC] while in the RANGE function returns to the MAIN RUN screen without making any change.

Q-RPT specific RPM4-AD operating settings are saved with the Q-RPT when another Q-RPT is made active (see Section 3.2.1, Table 5). When the Q-RPT is selected again, it has the same settings as it was left with. The air data measurement shortcuts always

return to the Q-RPT and measurement mode necessary for the air data measurement. They retain all other user settings.

]

3.3.1.1 RPM4-AD A160K/A160K (ROTARY WING)

Pressing [RANGE] always displays the active Q-RPT information. Pressing [RANGE] again toggles through the other Q-RPT choices available and the three

air data shortcuts. There are a total of five [RANGE] displays.

The first time [RANGE] is pressed, the active range is displayed. Pressing [RANGE] again displays the next range choice. Pressing [ENT] activates the displayed selection and returns to the main run screen.

The sequence of selections when [RANGE] is pressed is:

FIRST [RANGE] SELECTION: HI Q-RPT

Selects Hi Q-RPT with all previous settings (measurement mode, unit of measure, etc) for that Q-RPT.

SECOND [RANGE] SELECTION: HL (PARALLEL MODE) Q-RPT

Selects HL Q-RPT (Hi and Lo Q-RPTs in parallel ) with all previous settings (measurement mode, unit of measure, etc) for that Q-RPT.

Select A160K Hi kPa 60g/160a

Active A160K HL kPa 60g/160a

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

THIRD [RANGE] SELECTION: HI Q-RPT, SHORTCUT TO AIRSPEED AT VARYING ALTITUDE

Selects Hi Q-RPT in absolute, differential measurement mode (<Hd>) in which Hi – Lo Q-RPT differential pressure (airspeed) is displayed on top line and Lo Q-RPT absolute pressure (altitude) on the bottom line. Units of measure are default or last selected airspeed and altitude units.

FOURTH [RANGE] SELECTION: HL Q-RPT, SHORTCUT TO ALTITUDE, BEST UNCERTAINTY

Selects HL Q-RPT (Hi and Lo Q-RPTs in parallel) with altitude displayed on top line and rate of change on the bottom line. SDS is set so that the TEST(Ps) port is active. Unit of measure is default or last selected altitude unit.

FIFTH [RANGE] SELECTION: HL Q-RPT, SHORTCUT TO AIRSPEED, BEST UNCERTAINTY

Select A160K dif Hd airspeed & altitude

Select A160K abs HL altitude, parallel

Selects HL Q-RPT (Hi and Lo Q-RPTs in parallel) with airspeed displayed on top line and altitude corresponding to local atmospheric pressure on bottom line. Altitude cannot be changed. SDS is set so that the TEST(Pt) port is active. Unit

Select A160K gage HL airspeed, parallel

of measure is default or last selected airspeed and altitude units.

From the fifth [RANGE] display, pressing [RANGE] again returns to the first display.

3.3.1.2 RPM4-AD A350K/A160K (FIXED WING)

Pressing [RANGE] always displays the active Q-RPT information. Pressing [RANGE] again toggles through the other Q-RPT choices available and an air

data shortcut. There are a total of three [RANGE] displays.

The sequence of selections when [RANGE] is pressed is:

FIRST [RANGE] SELECTION: LO Q-RPT

Selects Lo Q-RPT with all previous settings for that Q-RPT.

SECOND [RANGE] SELECTION: HI Q-RPT

Active A160K Lo kPa 60g/160a

Selects Hi Q-RPT with all previous user settings for that Q-RPT.

Active A160K Hi kPa 60g/160a

3. OPERATION

THIRD [RANGE] SELECTION: SHORTCUT TO AIRSPEED AT VARYING ALTITUDE

Selects Hi Q-RPT in absolute, differential measurement mode (<Hd>) with RPT display in which differential pressure (Qc) is displayed on top line and Lo Q-RPT (Ps) on bottom line. Unit of

Shortcut to airspeed & varying altitude

measure is default or last selected airspeed and altitude units.

From the third [RANGE] display, pressing [RANGE] again returns to the first display.

Q-RPT full scale limits are given in the pressure or air data unit that is currently

active for that range.

Pressing [+/-] from the MAIN RUN screen provides a shortcut to a

momentary view of the active Q-RPT.

Many RPM4-AD settings and functions are Q-RPT specific. See Table 5 for

identification of Q-RPT specific settings.

For best metrological performance, vent the RPM4-AD Q-RPT before

changing active Q-RPT.

3.3.2 [UNIT]

 PURPOSE

To select the unit of measure in which RPM4-AD displays measured values.

The units of measure available under the [UNIT] key depend upon the active Q-RPT and

measurement mode. Seen Section for 3.3.1 information on selecting the active-Q-RPT and Section 3.3.3 for information on setting measurement mode (absolute, gauge, differential)

To change the unit of altitude displayed on the RPM4-AD bottom line with HL, absolute or

Hi, absolute + differential (Hd) Q-RPT active, select [DISPLAY], <4PRT> to select the altitude unit for the bottom line display with HL, absolute or Hi, absolute + differential QRP Tactive. 3.3.6.4.

 PRINCIPLE

RPM4-AD allows the unit of measure in which measured values are displayed to be changed.

RPM4-AD supports a variety of standard pressure units of measure, air data scaling factors and user defined units. To simplify operation, quick access to six units is made available under the [UNIT] key. The default units and the units that are supported depend on which

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

RPM4 Q-RPT is active and the active measurement mode. See Table 7 or Table 8 for definition of the types of units of measure are available by Q-RPT and measurement mode. The choice of six units displayed by the [UNIT] function can be customized by the user (see Section 3.5.6).

Table 7. Available unit of measure types by active Q-RPT and measurement mode,

RPM4-AD A160K/A160K (rotary wing)

MODE

parallel

<HL>

1. Best measurement uncertainty .

2. Altitude measured by Lo Q-RPT can be displayed while measuring airspeed.

Absolute <a>

Gauge,

negative gauge <g>

Absolute <a>

Gauge,

negative gauge <g>,

differential <d>

PRESSURE ALTITUDE AIRSPEED USER

Yes

No2

Yes No No Yes

Yes No

UNIT TYPE -RPT MEASUREMENT

Yes

Hi and

No Yes

1,2

Yes

Table 8. Available unit of measure types by active Q-RPT and measurement mode,

RPM4-AD A350K/A160K (fixed wing)

UNIT TYPE Q-RPT MEASUREMENT

Yes

No Yes

Yes

<Lo>

<Hi>,

<Hd>

MODE

Absolute <a>

Gauge,

negative gauge <g>

Absolute <a>

Gauge,

negative gauge <g>,

differential <d>

PRESSURE ALTITUDE AIRSPEED USER

Yes

Yes No No Yes

Yes No

1. Altitude measured by Lo Q-RPT can be displayed while measuring airspeed.

Internally, RPM4-AD always operates in Pascal (Pa), the SI unit of pressure. Values

expressed in other units of measure are obtained by applying conversion or scaling factors to Pascal. (see Section 7.2).

 OPERATION

To change the active unit of measure for a Q-RPT and measurement mode, press [UNIT] from the MAIN RUN screen while the Q-RPT and measurement mode is active (see Table 9 or Table 10 for default

of measure by active Q-RPT and measurement

units

1kPa 2inHg 3psi 4mbar 5m 6ft

mode). The display is (actual units shown specific to Q-RPT and measurement mode):

The cursor is on the number corresponding to the active pressure unit of measure for the active range.

To change the pressure unit of measure, select the desired unit. Making the selection returns to the MAIN RUN screen with the selected unit active.

3. OPERATION

If the unit of measure selected is a true airspeed (unit label in upper case, e.g. KTS), the temperature used in airspeed calculation must be specified. When the unit is selected, the display is:

True airspeed temp:

1. Entry field for temperature to be used in true airspeed calculation.

15.0 ºC

Enter the desired temperature value. The default value for true airspeed air temperature is set in [SPECIAL], <6Punit> when the unit is set up (see Section 3.5.6).

In RPM4-AD displays, calibrated airspeed units are represented in lower case (e.g. kts)

and true airspeed units are represented in upper case (e.g. KTS).

Table 9. Default [UNIT] choices by active Q-RPT and measurement mode,

RPM4 A160K/A160K (rotary wing)

MODE

Hi and Lo

parallel

<HL>

1. Altitude measured by Lo Q-RPT can be displayed while measuring airspeed.

Absolute <a>

Gauge,

negative gauge <g>

Absolute <a>

Gauge,

negative gauge <g>,

differential <d>

#1 #2 #3 #4 #5 #6

kPa inHg psi mbar m ft

kPa inHg psi inWa kts km/h

kPa inHg psi mbar hPa mmHg

kPa inHg psi inWa kts km/h

Table 10. Default [UNIT] choices by active Q-RPT and measurement mode,

RPM4 A350K/A160K (rotary wing)

UNIT Q-RPT MEASUREMENT

MODE

<Lo>

1. Altitude measured by Lo Q-RPT can be displayed while measuring airspeed.

Absolute <a>

Gauge,

negative gauge <g>

Absolute <a>

Gauge,

negative gauge <g>,

differential <d>

#1 #2 #3 #4 #5 #6

kPa inHg psi mbar m ft

kPa inHg psi inWa mbar hPa

kPa inHg psi mbar m ft

kPa inHg psi inWa kts km/h

UNIT X MEASUREMENT

The pressure unit of measure selected is Q-RPT and measurement mode specific. For that

Q-RPT and measurement mode, all functions and settings are represented in the current unit of measure for that range. However, certain internal and/or metrological functions (e.g., Q-RPT calibration coefficients) are always represented in Pa regardless of the current unit selection.

See Section 7.2 for information on the unit of measure conversion factors used by RPM4-AD.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

If the pressure unit selected is inWa (inches of water), the reference temperature for water

density must we specified in a separate menu (choices are 4ºC, 20ºC 60ºF). No reference temperature selection is necessary for the unit mmWa as the only reference temperature commonly used for mmWa is 4 ºC.

The default units of measure available under the UNIT function depend on the active Q-RPT

and measurement mode (see Tables Table 9 and Table 10). The choice of six units available under the UNIT function can be customized from a wider selection by the user (see Section

3.5.6). The units available under the UNIT function can be reset to default (see Section 3.5.9.2).

3.3.3 [MODE]

 PURPOSE

To set the measurement mode (absolute, gauge, negative gauge or differential) for the active Q-RPT.

For information on selecting the active Q-RPT, see Section 3.3.1. For selecting the unit of

measure, see Section 3.3.2.

 PRINCIPLE

RPM4-AD supports simple, one-step switching between different measurement modes:

Absolute Measures pressure relative to vacuum (zero is hard vacuum). Range is

from zero absolute to full scale.

Absolute mode is used to measure altitude, without airspeed (see

Section 3.2.3).

Gauge Measures

pressure relative to atmosphere (zero is ambient pressure).

Range is from zero gauge to full scale, full scale must be greater than zero.

Gauge mode is used to measure airspeed at altitude corresponding to

ambient atmospheric pressure (see Section 3.2.3).

Negativ

e Gauge Measures pressure relative to atmosphere (zero is ambient pressure).

Range is positive and negative from zero, negative to minus one atmosphere and positive to full scale.

Negative gauge mode does not support air data measurements.

Differential Measures the difference between the Hi and the Lo Q-RPT (Differential = Hi

– Lo). Differential measurement mode is only available when the Hi Q-RPT (<Hi>) is active and the measurement mode is absolute. Differential mode is selected “on top of” the Hi Q-RPT absolute measurement mode.

Differential mode is selected to measure airspeed and altitude

simultaneously with varying altitude. Differential mode allows true Ps and Pt operation (see Section 3.2.3).

Measurement mode selection is Q-RPT specific.

3. OPERATION

See Section 3.2.6 for information on differential mode operation (airspeed at varying

altitude). Differential mode operation is only available when the Hi Q-RPT is active and already in absolute measurement mode.

 OPERATION

To change the measurement mode for the active Q-RPT, press [MODE] from the MAIN RUN screen. The display depends upon the Q-RPT that is active.

If the Hi Q-RPT (<Hi>) is active, all four measurement modes are visible. Use <1abs> + <4dif> to measure altitude and airspeed simultaneously (see Section 3.2.3).

Meas mode: 1abs

2gage 3neg gage 4dif

If the parallel mode Q-RPT (<HL>) (RPM4-AD 160K/A160K only) or the Lo Q-QRPT (<Lo>) (RPM4-AD 350K/A160K only) is active, differential mode is not available. Use <1abs> to measure altitude only or <2gage> to measure airspeed at

Measurement mode: 1abs 2gage 3neg gage

altitude corresponding to current atmospheric pressure (see Section 3.2.3.1).

Certain RPM4-AD settings, including AutoZ ON/OFF (see Section 3.5.1) are Q-RPT AND

measurement mode specific. See Table 5 for a listing of settings and what they are specific to.

3.3.3.1 DIFFERENTIAL MEASUREMENT MODE OPERATION

Differential mode operation is only available with the Hi Q-RPT (<Hi>) active

(see Section 3.2.1) in absolute measurement mode. Differential mode supports simultaneous measurement of air speed and altitude with varying altitude (Ps, Pt, Qc) (see Section 3.2.3).

See Section 3.2.6 for differential measurement mode principle of operation.

To activate differential measurement mode, first be sure the Hi Q-RPT is active and in absolute measurement mode. If necessary, use [RANGE] to select the <Hi> Q-RPT (see Section 3.3.1) and [MODE] to select absolute measurement mode. Then, with the Hi Q-RPT active, press [MODE] from the MAIN RUN screen.

The cursor is on the mode, which should be <1abs>. If differential mode is already active, the cursor is on <1abs> and <4dif>.

The base pressure measurement mode, absolute, is the line pressure mode for the differential pressure (altitude when differential unit is airspeed). If necessary, change the base pressure measurement mode to <1abs>.

base measurement

Meas mode: 1abs 2gage 3neg gage 4dif

To activate differential measurement mode, select <4dif>. Operation returns to the MAIN RUN screen. The Q-RPT identifier in the top right hand corner of the MAIN RUN screen changes from <Hi> to <Hd>. AutoZero should always be run when differential measurement mode is initiated (see Section 3.3.9.3) or when the line pressure (pressure on the Lo Q-RPT (Ps) is changed.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

When differential mode is activated, AutoZ should be run at the line pressure

(altitude) with zero differential pressure applied to eliminate the zero error on differential pressure due to the initial disagreement of the Hi and Lo Q-RPTs (see Section 3.3.9.3).

When differential mode is active, the Q-RPT position indicator in the upper

right hand corner of the MAIN RUN screen and other displays is <Hd> instead of <Hi> (see Section 3.2.1, Table 4).

The following operating conditions are specific to differential mode:

MAIN RUN screen measured pressure display The display of measured

pressure in the MAIN RUN screen, top line, is the difference between the Hi and the Lo Q-RPTs (Hi – Lo) with a differential mode AutoZ correction (see Section 3.5.1). The measurement mode indicator is

<d>. The Q-RPT position indicator is <Hd>.

Default DISPLAY function The default display function is RPT with the

Lo Q-RPT

displayed on the bottom display line (see Section

3.3.6.4). This allows the line pressure (Lo Q-RPT indication) to be viewed simultaneously with

the differential pressure, and altitude measured by the Lo Q-RPT to be viewed while displaying air speed. The Lo Q-RPT altitude unit of measure is set in the RPT DISPLAY function (see Section 3.3.6.4). All other DISPLAY

functions (Average, Rate, Deviation, HiLo,

Freeze) apply to the differential pressure.

SDS function [SDS] key operation to OPEN SDS opens SDS of both

the Hi and Lo Q-RPTs simultaneously (see Section

3.3.8.1). Overpressure is driven by the pressure range of the Lo Q-RPT.

AutoZ function AutoZ

manages zeroing of differential mode and is intended to “tare” the two Q-RPTs at a common line pressure (see Section 3.3.9.3). In air data measurements, the line pressure is the altitude. AutoZ should always be run when the altitude is changed.

Leak Check function The leak check function uses the differential mode

measurement (see Section 3.3.5).

Head function The head function applies to

the differential pressure

(see Section 3.3.7).

UL function The UL limits apply to positive

pressure (see Section 3.4.4) and the default is the maximum Lo and Hi Q-RPT based measurement mode ULs also remain active. The Hi Q-RPT UL provides an upper limit for the maximum pressure on the Hi side of the differential pressure. Exceeding the differential and/or absolute mode Hi Q-RPT UL causes the display of differential pressure to flash. The Lo Q-RPT UL provides an upper limit for the line pressure.

and negative differential

value of the differential pressure. Both the

3. OPERATION

3.3.4 [AUTORANGE]

This feature is not used in RPM4-AD models.

3.3.5 [LEAK CK]/RATE OF CHANGE MEASUREMENT

 PURPOSE

To run an automated leak check routine that measures the leak rate of the system connected to the RPM4-AD active TEST port(s). Also used to measure average rate of change over a specified time period as required to evaluate the rate of change of altitude set by an air data test set.

 PRINCIPLE

The LEAK CHECK function is provided as a means of checking and quantifying the leaks that may be present in the system connected to the RPM4’s active Q-RPT TEST port(s). It is also used to measure rate of change of altitude over a specified time period (rate of climb).

The principle of the LEAK CHECK function for measurement of a leak is the measurement of the natural decrease or increase of pressure in a fixed volume over time. The LEAK CHECK function allows a leak check time to be set. The total pressure change and the average rate of change over the leak check time are calculated and displayed.

The LEAK CHECK function also measures average rate as required to evaluate the rate of change of altitude set by an air data test set. To use the function in this way, set the desired rate measurement time period, then set the rate with the air data test set. When ready, press [ENT] on the RPM4-AD to start the measurement.

In differential pressure measurement mode (see Section 3.2.6), the leak check

measurement is based on the measurement of the differential pressure.

 OPERATION

To run a leak check, first set the pressure to the desired pressure. To verify a rate of change set by another device (such as an air data test set), first set the rate of change on the device.

Changing the pressure in a test system causes adiabatic temperature changes in the

pressurized medium that need to have dissipated before a valid leak measurement can be made. In general, a 0.5 to 1 minute wait before running a leak check is adequate to allow the adiabatic temperature change to dissipate and valid leak measurements to be made. However, stabilization time may be longer as volume and pressure increases.

To access the LEAK CHECK function, press [LEAK CHECK] from the MAIN RUN screen. Select <1run> to run a leak test or rate of change measurement. The display is:

Set sample time:

1. Edit field for the time over which the rate will be determined, in seconds.

15 s

Edit the rate measurement time if desired (minimum 1, maximum 999 seconds) and press [ENT].

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

Press [ENT] again when ready to start the test. The test display is:

1. Standard MAIN RUN screen first line showing measured pressure.

2. Active Q-RPT position indicator

3. Indication that rate measurement test is running and countdown of time remaining.

50.3314 kPa a HL

Measuring... 13 s

[ESC] can be used to abort the test. [ENT] while the test is running restarts the measurement timer. When the timer countdown has completed, RPM4-AD beeps three times and the leak results screen is displayed:

1. Total pressure change from start to finish of measurement time.

2. Indicator of Q-RPT used to run the test.

3. Average rate of change of pressure over the leak check time period (∆P/time in minutes).

∆P 0.323 kPa a HL

Rate 0.021 kPa/min

From the test results screen, press [ENT] to restart the timer and repeat the test.

Press [ESC] to return to leak check main menu and exit to the MAIN RUN screen.

To view the results of the most recently completed test, press <2view>. If NO test data is stored (i.e., if the RPM4-AD has never run a leak test or a reset has cleared previous results), the results screen displays <Data NOT available> briefly and returns to MAIN RUN screen. Press [ENT] or [ESC] to return to the MAIN RUN screen.

Leak check is Q-RPT specific in the sense that a leak check is run using the active Q-RPT.

However, only one set of leak check results is maintained in memory and each leak test completed overwrites the memory. View leak check always shows the results of the last test run regardless of the Q-RPT that is now active. The results screen includes the Q-RPT indicator to indicate the Q-RPT with which the test was run.

3.3.6 [DISPLAY]

 PURPOSE

To select, from a variety of choices, the information that is displayed on the second line of the RPM4-AD main run screen.

 PRINCIPLE

RPM4-AD supports a variety of advanced measurement functions that are displayed on the second (bottom) line of the RPM4-AD main run screen. In summary, the available display functions are:

AVERAGE Calculates the average measurement over a user specified period of time

and displays the average, the standard deviation about the mean and a countdown in seconds to the next average (see Section 3.3.6.1). This function is often used to filter out pressure noise in an unstable system. The of the noise is quantified by the standard deviation about the mean. A second Avg screen allows the instantaneous pressure values to be viewed during an averaging cycle.

magnitude

3. OPERATION

RATE Calculates and displays the current rate of change of pressure, altitude or

airspeed in current unit of measure per second or per minute (see Section

3.3.6.2). This function is a useful indication of the stability of the pressure being measured. It is often used as

an indication of positive or negative leak rate and as a go/no go criterion of when to take data when comparing RPM4-AD and a device under test, for example in a calibration. Rate is used by the Ready/Not Ready function to determine when a Ready condition exists (see Section 3.2.4). To measure rate of change over a period of time,

e the LEAK CHECK function (see Section 3.3.5).

DEVIATION Continuously calculates and displays the difference between

the value

measured by RPM4-AD and a target value entered by the user (see Section

3.3.6.3). This function is useful in monitoring the evolution of pressure around and/or away from a desired set point.

RPT

Allows measurement from the two Q-RPTs to be displayed simultaneously (see Section 3.3.6.4). This function can be used to monitor two separate pressures simultaneously. It is particularly useful when the

measurement unit is airspeed to simultaneously observe the value of altitude measured by the Lo Q-RPT.

HI/LO Records and displays maximum and minimum values measured (see

Section 3.3.6.5). This function is used to keep track of the minimum and maximum

pressure observed in a system over a period of time or to monitor

if a pressure min/max limit has been exceeded..

FREEZE Captures and displays the value measured by the active Q-RPT of RPM4-AD

when the [ENT] key is pressed (see Section 3.3.6.6). This function is useful to record the pressure present at the

time of an operator observed trigger event, for example when the needle of an analog indicator was on the nominal point or when a switch activates.

CLEAN Blanks out the second line of the display (see Section 3.3.6.7). This function

used when a simple display of pressure measured by the RPM4-AD active

is Q-RPT with minimal additional information is desired.

 OPERATION

To set the DISPLAY function press [DISPLAY] from the MAIN RUN screen.

The display is:

1avg 2rate 3dev 4RPT

5HiLo 6freeze 7clean

The cursor is on the active DISPLAY function. Selecting a display function returns to the MAIN RUN screen with the selected function active.

Display menu choices include:

<1avg> Display average pressure and standard deviation. Specify averaging time period

(see Section 3.3.6.1).

<2rate>

> Display deviation of the measured value from a target value and specify the

<3dev

Display rate of change of measured value (see Section 3.3.6.2).

target value (see Section 3.3.6.3).

T> Display the measurement of a Q-RPT other than the active Q-RPT (see

<4RP

Section 3.3.6.4).

<5HiLo>

Display the maximum and minimum values measured by the active Q-RPT since HiLo reset (see Section 3.3.6.5).

<6freeze>

Capture and display the value measured by the active Q-RPT when [ENT] is pressed (see Section 3.3.6.6).

<7clean> Leave the second line of the display blank (see Section 3.3.6.7).

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

The DISPLAY selection is Q-RPT specific. A DISPLAY selection made in one Q-RPT does

not apply to other Q-RPTs.

The default DISPLAY function is Rate which causes the second line of the display to show “R”

followed by the current rate of change of pressure in current pressure units per minute or per second. In differential mode (<Hd>), the default DISPLAY function is RPT which shows the measurement of the Lo Q-RPT .

3.3.6.1 AVG (AVERAGE)

 PURPOSE

To activate the Average DISPLAY and/or adjust the period of time over which averaging occurs.

See Section 3.3.6.  Principle.

 OPERATION

To access the Average DISPLAY, press [DISPLAY], <1Avg>. The display is:

Averaging Period:

1. Edit field for averaging period in seconds. Default is 20. Minimum 1, maximum 999.

20 s

Edit the averaging time period if desired. Pressing [ENT] returns to the MAIN RUN screen with the Average DISPLAY active.

With the Average DISPLAY active the MAIN RUN screen is:

1. Average measured over last completed averaging period.

2. Standard deviation of last completed averaging period.

3. Countdown in seconds until completion of ongoing averaging period.

96.929 kPa a Hi

δ 0.0007 18Avg

The Average DISPLAY has a second screen that allows the instantaneous pressure readings to be viewed while an averaging cycle is running. The instantaneous Average screen is:

1. Instantaneous pressure values at RPM4’s normal update rate.

2. Current rate of change of pressure in pressure units/second.

3. Countdown in seconds until completion of ongoing averaging period.

96.929 kPa a Hi

R 0.0025 18Avg

The [+/-] key toggles between the MAIN RUN Average screen and the instantaneous values Average screen.

3. OPERATION

Pressing [ENT] while in the Average DISPLAY aborts the current averaging

period and causes a new one to begin. [ENT] can thus be use to trigger a new averaging period on demand.

In the Average DISPLAY the Ready/Not Ready indication applies to the result

of the previous averaging period (see Section 3.2.4). <Ready> indicates that all readings during the previous averaging period met the stability criterion. <Not Ready> indicates that one or more readings were outside of the stability criterion.

Changing the pressure unit of measure, measurement mode or range while

the averaging screen is active, starts a new averaging period.

To go to a DISPLAY other than Average, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.3.6).

3.3.6.2 Rate

 PURPOSE

To activate the Rate DISPLAY.

See Section 3.3.6 [DISPLAY],  Principle.

 OPERATION

To activate the Rate DISPLAY press [DISPLAY], . The display is:

Select whether the rate should be displayed in unit per minute or unit per second. The default is per minute.

Display rate per:

1minute 2second

When the selection is made, operation returns to the MAIN RUN screen with the Rate DISPLAY active.

With the Rate DISPLAY active the MAIN RUN screen is:

1. Current rate of change of in current unit of measure per minute (</m>) or second (</s>). The default is per minute.

20473.6 ft a HL

R 378.3 /m

The Rate DISPLAY is different and separate from the stability setting which

is used to set the stability criterion on which the Ready/Not Ready indication is based (see Sections 3.4.3 and 3.2.4). The Rate DISPLAY only causes

the current rate of change to be displayed and has NO affect on the

stability setting or the Ready/Not Ready condition.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

The Rate DISPLAY is the default display except in differential measurement

mode in which the default DISPLAY is RPT so the measurement of the Lo Q-RPT is displayed.

To go to a DISPLAY other than Rate, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.3.6).

3.3.6.3 Dev (Deviation)

 PURPOSE

See Section 3.3.6 [DISPLAY],  Principle.

To activate the Deviation DISPLAY and/or set the deviation target value.

 OPERATION

To activate the Deviation DISPLAY press [DISPLAY], <3Dev>. The display is:

Target:

100.000 kPa a

Edit the desired target value. Pressing [ENT] returns to the MAIN RUN screen with the Deviation DISPLAY active using the entered target value.

The target value is the value from which deviations (D) are measured by the

Deviation DISPLAY following:

D = current value - target value

With the Deviation DISPLAY active the MAIN RUN screen is:

1. Deviation of current measured value from the target value.

2. Target value.

99.1135 kPa a zHL

D -0.8865 T100.000

Pressing [ENT] from the MAIN RUN screen when the Deviation DISPLAY is

active goes directly to the Target editing screen. This allows the target value to be changed without going through the DISPLAY menu.

If the pressure measurement unit or mode is changed while the Deviation

DISPLAY is active the target value remains at the same numerical value. It is NOT converted.

To go to a DISPLAY other than Deviation, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.3.6).

3. OPERATION

3.3.6.4 RPT

 PURPOSE

See Section 3.3.6,  Principle.

To activate the RPT DISPLAY.

The RPT DISPLAY is the default DISPLAY in differential measurement mode

(<Hd>) (see Section 3.2.6).

 OPERATION

For the sake of clarity, when describing the RPT DISPLAY, the Q-RPT

displayed on the top line of the display when the RPT function is selected is referred to as the “active” Q-RPT. The other Q-RPT to be displayed on the second (bottom) line of the RPM4-AD display is referred to as the “inactive” Q-RPT. It is “inactive” in the sense that all RPM4-AD functions and settings such as UNIT and RES still apply to the “active” Q-RPT. In differential pressure measurement mode (<Hd>), the Lo Q-RPT is always the “inactive” Q-RPT. In parallel measurement (<HL>), the Hi or the Lo Q-RPT may be the “inactive” Q-RPT.

To activate the RPT DISPLAY, press [DISPLAY], <4RPT>.

If the active measurement unit is NOT an airspeed unit, operation returns to the MAIN RUN screen with the inactive Q-RPT displayed on the display’s bottom line and the settings (unit of measure, resolution) of the inactive Q-RPT are the same as for the active Q-RPT.

If the active measurement unit IS an airspeed unit, the display on the bottom line is altitude so that airspeed and altitude can be viewed simultaneously. When <4RPT> is selected, the altitude unit must be specified. The display is:

Select the desired unit for the second line display of altitude.

Lo Q-RPT altitude unit: 1ft 2m

After the altitude unit selection, operation returns to the main run screen with the RPT display active.

When RPM4-AD A160K/A160K is in parallel (<HL>) mode in which both Q-RPTs

measure the same pressure in parallel, if the active unit is airspeed the bottom line display of altitude is obtained using the last measurement of atmospheric pressure made by the Lo Q-RPT corrected by the change in atmospheric pressure since the last measurement as measured by the on-board barometer. If the active unit is NOT airspeed, the Q-RPT to display on the lower display line (<Hi> or <Lo>) must be specified.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

When the RPT DISPLAY is active and the unit of measure for the active Q-RPT IS an airspeed unit, the MAIN RUN screen is:

1. Active Q-RPT measurement.

2. Active Q-RPT indicator.

3. Altitude at which airspeed is being measured.

498.778 kts d zHd

*22477.5 ft a zLo

When the RPT DISPLAY is active and the unit of measure for the active Q-RPT is NOT an airspeed unit, the MAIN RUN screen is:

1. Active Q-RPT measurement.

2. Active Q-RPT indicator.

3. Inactive Q-RPT measurement.

150.582 kPa a zHi

* 98.477 kPa a zLo

If SDS Self Defense System (see Section 3.2.8) is CLOSED on the inactive Q-

RPT when the RPT DISPLAY is activated, SDS can be OPENED on the inactive QRPT using [SPECIAL], <4SDS>, <1temp open/close> (see Section 3.5.4). In differential measurement mode, SDS is be opened simultaneously on

both Q-

RPTs using [SDS] (see Section 3.3.8).

The RPT DISPLAY is the default display in differential measurement mode.

When the RPT display is active, executing a Q-RPT change to the inactive

Q-RPT makes the inactive Q-RPT the active Q-RPT. The DISPLAY defaults back to Rate ( Section 3.3.6.2).

To go to a DISPLAY other than RPT, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.3.6).

3.3.6.5 Hi/Lo

 PURPOSE

To activate the Hi/Lo DISPLAY.

See Section 3.3.6,  Principle..

 OPERATION

To activate the Hi/Lo DISPLAY press [DISPLAY], <5Hi/Lo>. Pressing <5Hi/Lo> resets the Hi/Lo values and returns to the MAIN RUN screen with the Hi/Lo DISPLAY active.

3. OPERATION

With the Hi/Lo DISPLAY active the MAIN RUN screen is:

1. Highest measurement observed since Hi/Lo reset.

2. Lowest measurement observed since Hi/Lo reset.

18377.6 ft a zHi

H 17344.5 L18444.2

The Hi/Lo values change each time a new Hi or Lo pressure is observed.

The Hi/Lo record can be reset at any time by pressing [ENT]. This allows a

Hi/Lo reset without going back through the DISPLAY menu.

If the measurement unit or mode is changed while the Hi/Lo DISPLAY is

active, Hi/Lo resets.

To go to a DISPLAY other than Hi/Lo, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.3.6).

3.3.6.6 Freeze

 PURPOSE

To activate the Freeze DISPLAY.

See Section 3.3.6,  Principle.

 OPERATION

To activate the Freeze DISPLAY press [DISPLAY], <6Freeze>. Pressing <6Freeze> returns to the MAIN RUN screen with the Freeze DISPLAY active.

With the Freeze DISPLAY active the MAIN RUN screen is:

1. Pressure measured by active Q-RPT when [ENT] was pressed (displays 0.00 by default when Freeze DISPLAY is first activated).

99.135 kPa a zHi

F 99.2133

Pressing [ENT] causes the current measurement of the active RPM4-AD Q-RPT to be captured and displayed.

If the measurement unit or mode is changed while the Freeze DISPLAY is

active, the Freeze value defaults back to zero.

To go to a DISPLAY other than Freeze, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.3.6).

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

3.3.6.7 Clean

 PURPOSE

See Section 3.3.6,  Principle.

To activate the Clean DISPLAY.

 OPERATION

To activate the Clean DISPLAY press [DISPLAY], <7Clean>. Pressing <7Clean> returns to the MAIN RUN screen with the Clean DISPLAY active.

With the Clean DISPLAY active the MAIN RUN screen is:

1. Conventional MAIN RUN screen first line.

2. “Clean” second line.

99.135 kPa a zHi

To go to a DISPLAY other than Clean, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.3.6).

3.3.7 [HEAD]

 PURPOSE

To cause a pressure head correction to be added to or subtracted from the pressure measured by the RPM4-AD in order to predict the pressure at a height other than the RPM4’s reference level.

 PRINCIPLE

RPM4-AD measures gauge, absolute or differential pressure at the height of the rear panel TEST ports. Frequently, when performing a calibration or test, the device or system under test is at a different height than the RPM4’s TEST ports. This difference in height, frequently called head, can cause a significant difference between the pressure measured by the RPM4-AD at the height of its TEST ports and the pressure at the device under test which is at a different height. In this case, it is useful to make a head correction to the pressure measured by the RPM4-AD in order to predict the pressure actually applied present a different height.

RPM4-AD can accurately determine “head” pressures for nitrogen, helium and air as the pressurized medium. In calculating the head value, standard gravity (9.80665 m/s Gas densities are calculated from the selected gas’s standard density correcting for temperature of 20°C and the measured pressure using the gas’s compressibility factor

The [HEAD] function key is used to specify the height difference between the RPM4-AD TEST ports and another height. Entering a height of zero turns the function off. The height unit and the test gas are specified by pressing [SPECIAL], <3Head> (see Section 3.5.3).

) is used.

Specifying the head height within ± 2.5 cm (1 in.) is adequate to assure that, even in the

worst case, the uncertainty on the head correction will be insignificant relative to the tolerance on the pressure measurement.

3. OPERATION

 OPERATION

To access the HEAD function, press [HEAD]. The display is:

Edit head height:

1. Edit field for head height.

2. Test gas currently specified for the head correction.

+ 25 cm N2

Edit the head height to the desired value. Press [ENT] to return to the MAIN RUN screen with the new head correction active. Press [ESC] to return with no changes.

The reference height of the RPM4-AD

pressure measurement is the middle of the RPM4-AD TEST ports. The head height should be entered as a positive value if the device or system under test is higher than the RPM4-AD and negative if it is lower.

The HEAD function is NOT Q-RPT specific. The HEAD ON or OFF status and settings

remain the same as active Q-RPT is changed.

When a head correction is being applied, it is indicated by <h> in the top line of the MAIN

RUN screen (see Section 3.1.1). When the head correction is zero, the <h> is not shown.

To change units of head height between inches and centimeters and to change the test

gas species, use [SPECIAL], <3head> (see Section 3.5.3).

3.3.8 [SDS] (SELF DEFENSE SYSTEM)

 PURPOSE

To CLOSE SDS on all reference pressure transducers (Q-RPTs). To OPEN SDS on the

active Q-RPT/TEST port.

The [SDS] key should be used with care to avoid accidentally over pressuring a Q-RPT.

Always double check to ensure that the pressure applied to the Q-RPT’s TEST port is lower than the Q-RPT’s maximum pressure before OPENING SDS.

SDS can be set to permanently be OPEN as if no SDS were installed (see Section 3.5.4.2).

 PRINCIPLE

SDS is a self defense system to protect RPM4-AD Q-RPTs from overpressure. SDS CLOSES automatically to protect a Q-RPT that is not active. Activating an individual Q-RPT automatically CLOSES SDS on the other Q-RPT. Powering down the RPM4-AD or energizing it also CLOSES SDS on all Q-RPTs.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

When SDS is CLOSED, the Q-RPT(s) is (are) isolated from the active TEST port and opened to the VENT port. SDS must be OPENED for the pressure applied to the TEST port to be measured. The [SDS] key is used to OPEN SDS.

The SDS function can also be used to CLOSE SDS as might be desired when leaving RPM4-AD at rest, when a possible overpressure situation is anticipated or anytime it is desirable to shut off the TEST port and vent the Q-RPT. Pressing [SDS] always CLOSES SDS.

See Sections 3.3.8.1 and 3.3.8.2 for information specific to SDS operation in

differential and

parallel measurement modes which are frequently used by RPM4-AD.

See Section 3.2.8 for general information on SDS and its principles and Section 5.6, for

Q-RPT module schematics and valve states with SDS open and closed.

SDS closed is indicated by <SDS CLOSED> flashing in the current measured pressure

display field. When SDS is closed, the Q-RPT is isolated from the TEST port and connected to the VENT port.

 OPERATION

Though the SDS self defense system includes features to protect Q-RPTs against

overpressure, SDS should NOT be considered a fail-safe overpressure protection system. SDS cannot guarantee that overpressure damage will NOT occur. SDS closing automatically may protect a Q-RPT in case of accidental overpressure but conventional measures for overpressure protection should always be used. Damage to Q-RPTs due to overpressure is NOT covered by the RPM4-AD product warranty even when SDS is present and ON.

The maximum pressure that should be applied to an RPM4-AD TEST(+) port when SDS is

CLOSED is 10 MPa (1 500 psi).

Use [SDS] to OPEN SDS if it is CLOSED for the active Q-RPT(s) and/or to CLOSE SDS for the active and inactive Q-RPT.

When [SDS] is pressed, there are three possible results, depending on whether SDS is ON (see Section 3.5.4.2), and whether SDS of the active Q-RPT is OPEN or CLOSED.

. If the active Q-RPT’s SDS is “full time OFF” (see Section 3.5.4.2): <SDS

is OFF and

OPEN> is displayed for 5 seconds and operation returns to the MAIN RUN screen.

2. If the SDS on the active RPT is OPEN: SDS is CLOSED and operation returns to the MAIN RUN screen.

3. If the SDS on the active Q-RPT is CLOSED: The OPEN SDS routine is presented. The display is :

1. Maximum acceptable pressure of active Q-RPT(s) (always absolute).

2. Position designator of Q-RPT for which SDS will be opened.

3. Indication of which TEST port(s) will be open-end when SDS is opened.

Pmax! 160 kPa a HL

Open Ps? 1no 2yes

Check that the pressure applied to the indicated TEST port does NOT exceed the maximum acceptable value for the Q-RPT. Select <1no> to return to the MAIN RUN

3. OPERATION

screen without OPENING SDS, select <2yes> to OPEN SDS and return to the MAIN RUN screen with SDS OPEN (the active TEST port open).

Opening SDS with a pressure greater than Pmax! applied to the test port may cause

overpressure damage to the Q-RPT(s).

In differential measurement mode, opening SDS acts simultaneously on BOTH the Ps and

Pt TEST ports (see Sections 3.3.8.1).

In parallel measurement mode (HL Q-RPT), the active TEST port is the TEST(Ps) port in

absolute measurement mode and the TEST(Pt) port in gauge measurement mode. Normal SDS operation using [SDS] opens and closes the active TEST port while the inactive test port is always closed. SDS temp open/close can be used to open SDS on the inactive TEST port.

The [SDS] key is also the [2] key which is pressed to select <2Yes> to OPEN SDS.

Thus, SDS can be OPENED by two rapid presses of [SDS]. Use this feature to conveniently OPEN SDS but always check that the pressure connected the active TEST port does NOT exceed the Q-RPT(s) Pmax! before doing so.

When changing active Q-RPT, SDS is automatically CLOSED for the Q-RPT that is being

changed from, leaving the inactive Q-RPT with SDS CLOSED.

The SDS valves can be controlled directly regardless of which Q-RPT is currently active

(see Section 3.5.4).

SDS can be permanently opened so regular operation is as if SDS were not present (see

Section 3.5.4.2).

3.3.8.1 SDS IN DIFFERENTIAL MEASUREMENT MODE

In differential measurement mode, opening SDS opens SDS for BOTH the Hi

and Lo Q-RPTs (Ps and Pt TEST ports). Before opening SDS, be certain that the pressure applied to both the Ps and Pt TEST ports is less than the maximum pressure of TEST port’s Q-RPT.

Differential measurement mode (see Section 3.2.6) makes measurements using the RPM4-AD’s two Q-RPTs independently. In this mode, the function of the [SDS] key is adapted to facilitate dual Q-RPT operation. SDS on both the active an inactive Q-RPTs at the same time.

[SDS] can OPENS

Pressing [SDS] always CLOSES any OPEN SDS, as it does in single Q-RPT mode operation. If both SDS are CLOSED, pressing SDS goes to the usual OPEN SDS routine which OPENS SDS for both Q-RPTs.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

The display is :

1. Maximum acceptable pressure of the Lo Q-RPT (always absolute).

2. Position designator of active Q-RPT (<Hd> for differential mode).

3. Indication that opening SDS will open both the Pt and Ps TEST ports.

Check that the pressure applied to BOTH the TEST ports does NOT exceed the maximum acceptable value. Select <1no> to return to the MAIN RUN screen without OPENING SDS, select <2yes> to OPEN SDS for both Q-RPTs and return to the MAIN RUN screen with SDS OPEN (both Q-RPTs open to their TEST ports).

3.3.8.2 SDS IN PARALLEL MEASUREMENT MODE, RPM4-AD A160K/A160K ONLY

In parallel mode both Q-RPTs are connected together internally by the

RPM4-AD’s internal bypass valve (see Section 3.2.5). For gauge measurement mode, the active TEST port is the TEST(Pt) port. For absolute measurement mode, the active TEST port is the TEST(Ps) port. Opening SDS opens SDS for the TEST port that is used for the active measurement mode.

Pmax! 160 kPa a Hd

Open Pt&Ps? 1no 2yes

In parallel measurement mode (see Section 3.2.5), the RPM4-AD’s two RPTs are connected to one TEST port by the internal bypass valve. Only one TEST port is used depending on the measurement mode. The (Ps) TEST port is used for absolute mode, the (Pt) TEST port is used for gauge mode. [SDS] OPENS and CLOSES SDS on the test port that is used, the other port is always kept CLOSED.

Pressing [SDS] always CLOSES any ON and OPEN SDS, as it does in single Q-RPT mode operation. However, if SDS for the active TEST port is CLOSED, pressing SDS goes to the usual OPEN SDS routine which will OPEN SDS for active TEST port.

The display is :

1. Maximum acceptable pressure of the HL Q-RPT (always absolute).

2. Position designator of active Q-RPT (<HL> in parallel mode.

3. Active TEST port on which SDS will be opened (Pt in gauge measurement mode, Ps in absolute measurement mode).

Pmax! 160 kPa a HL

Open Pt? 1no 2yes

Check that the pressure applied to the active TEST port does NOT exceed the maximum acceptable value. Select <1no> to return to the MAIN RUN screen without OPENING SDS, select <2yes> to OPEN SDS and return to the MAIN RUN screen with SDS OPEN (both Q-RPTs open to the active TEST port).

3. OPERATION

3.3.9 [AUTOZ]

 PURPOSE

See Section 3.5.1,  Principle for a full explanation of the AutoZ function.

To run the AutoZ function that rezeros the active Q-RPT between full calibrations.

 PRINCIPLE

Run AutoZ is the function by which the current Q-RPT reading is compared to a reference,

, at atmospheric pressure to determine a new value of P

std,0

. The value of P

offset

is then used by AutoZ to automatically correct the Q-RPT for possible changes in zero over time (see Section 3.5.1,  PRINCIPLE).

Running AutoZ in parallel mode (see Section 3.2.5) autozeros the Hi and Lo Q-RPTs

simultaneously and independently. There are no Zoffset values specific to the HL Q-RPT.

See Section 3.3.9.1 to run AutoZ in gauge in negative gauge modes.

See Section 3.3.9.2 to run AutoZ in absolute mode.

See Section 3.3.9.3 to run AutoZ in differential mode.

3.3.9.1 [AUTOZ] IN GAUGE AND NEGATIVE GAUGE MODE

 PURPOSE

See Section 3.5.1,  Principle for a full explanation of the AutoZ function.

To “rezero” the active Q-RPT in gauge measurement mode.

 OPERATION

For the AutoZ function key to run AutoZ, AutoZ must be turned ON for the

active Q-RPT and measurement mode. AutoZ ON is indicated by <z> to the left of the Q-RPT designator on the first line of the MAIN RUN screen. AutoZ ON and OFF is set using [SPECIAL], <1AutoZ> (see Section 3.5.1). If AutoZ

is OFF for the active Q-RPT, and measurement mode, <AutoZ is

off…> is displayed when [AutoZ] is pressed.

Running AutoZ in or parallel mode (see Section 3.2.5) autozeros both the Hi

and Lo Q-RPTs simultaneously.

To run AutoZ in gauge measurement mode, set gauge or negative gauge as the measurement mode (see Section 3.3.3) and press [AutoZ] from the MAIN RUN screen. <Running gauge AutoZ> is displayed briefly before returning to the MAIN RUN screen. To be sure the Q-RPTs are

really open to zero gauge pressure, SDS may be closed to shut the Q-RPTs off from the TEST ports and open vent them to atmosphere.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

Before running AutoZ in gauge mode, ensure that the pressure applied to

the Q-RPT is truly zero gauge (atmospheric pressure). If running AutoZ in gauge mode results in a zero offset that RPM4-AD considers unusually large, <Confirm 0 gauge P!> is displayed when AutoZ is pressed. Check that zero gauge pressure is applied to the TEST port(s) and press ENTER to continue or ESCAPE to abort. To be sure the Q-RPTs are really open to zero gauge pressure, SDS may be closed to shut the Q-RPTs off from the TEST ports and open vent them to atmosphere.

Allow the RPM4-AD to stabilize at atmospheric pressure and ambient

temperature for 1 to 2 minutes before running AutoZ in gauge mode.

3.3.9.2 [AUTOZ] IN ABSOLUTE MODE

 PURPOSE

See Section 3.5.1,  Principle for a full explanation of the AutoZ function.

To “rezero” the active Q-RPT in absolute measurement mode.

 OPERATION

For the AutoZ function key to run AutoZ, AutoZ must be turned ON for the

active Q-RPT and measurement mode. AutoZ ON is indicated by <z> to the left of the range designator on the first line of the MAIN RUN screen. AutoZ ON and OFF is set using [SPECIAL], <1AutoZ> (see Section 3.5.1). If AutoZ

OFF for the active range, and measurement mode, <AutoZ is off…> is

is displayed when [AutoZ] is pressed.

Running AutoZ in or parallel mode (see Section 3.2.5) autozeros both the Hi

and Lo Q-RPTs simultaneously.

AutoZ cannot be run when the active unit of measure is an altitude unit.

To run AutoZ in absolute measurement mode, set absolute measurement mode (see Section 3.3.3) and press [AutoZ] from the MAIN RUN screen. The display is:

1. Active Q-RPT designator.

2. Current measurement mode (absolute).

3. Selection of source of P to AutoZ.

reference to which

std,0

Selecting <1Entry> allows the value of P

Selecting <2COM2> allows the value of P DHI RPMx connected to RPM4’s COM2 communications port.

AutoZ Hi abs by:

1Entry 2COM2 3Lo RPT

to be entered from the front panel keypad.

std,0

to be read automatically from another

std,0

3. OPERATION

Selecting <3Lo RPT> is shown only if the active Q-RPT is Hi. This selection allows the value of P

for the Hi Q-RPT to be read automatically from the

std,0

RPM4s Lo Q-RPT.

Allow the RPM4-AD to stabilize at atmospheric pressure and ambient

temperature for 10 to 15 minutes before running AutoZ in absolute mode.

If running AutoZ results in a value of P

that is greater than ± 0.005 % FS of

offset

the span of the Q-RPT that is being AutoZeroed, the Q-RPT and/or the reference used as the source of P have been faulty. Before activating a new P

may be out of tolerance or the AutoZ process may

std,0

greater than ± 0.005 % FS of

offset

the active Q-RPT, check to be sure that both the Q-RPT and the reference were in good working order, properly vented to stable atmospheric pressure, at the same height, and reading in the same pressure units when AutoZ was run.

When the run AutoZ selection is made, if a HEAD correction is currently active

(see Section 3.3.7) the head correction is momentarily disabled while running AutoZ to avoid “zeroing out” the head value.

The value of P

is always displayed and entered in Pascal (Pa).

offset

Run AutoZ by Entry

AutoZ by entry allows the value of P

(see Section 3.5.1,  PRINCIPLE) to be

std,0

entered directly from the RPM4-AD front panel. This provides a simple way of AutoZeroing relative to an independent reference device such as a house barometer that does not interface directly with RPM4-AD.

To access run AutoZ by entry press [AutoZ], <1entry>. The display is:

1. Real time pressure reading (without head correction), pressure unit of measure and measurement mode of the active Q-RPT.

2. Active Q-RPT position designator.

3. Entry field for the value of P pressure unit of measure.

. in the current

std,0

Enter the value of the AutoZ reference (P

std,0

96.7755 kPa a Hi

Pstd,0:0.00000

) in the same unit of measure as the top line display and press [ENT]. RPM4-AD logs the reading and calculates a new AutoZ offset value. The next display is:

Press [ENT] to activate the new value of

or [ESC] to start over with entry of a

offset

new AutoZ reference (P

std,0

) value.

Old P

New P

offset

: 0.0 Pa

: 1.3 Pa

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

If AutoZeroing the HL (parallel mode) Q-RPT the Old P

offset

/New P

display

offset

shows the values for both Q-RPTs simultaneously:

1. Old value of P This is the value RPM4-AD is currently using.

2. New value of P Q-RPT. This is the value RPM4-AD will use if it is activated.

3. Old value of P This is the value RPM4-AD is currently using.

4. New value of P Q-RPT. This is the value RPM4-AD will use if it is activated.

The value of P

in Pascal for the Hi Q-RPT.

offset

just determined for the Hi

offset

in Pascal for the Lo Q-RPT.

offset

just determined for the Lo

offset

is always in Pascal (Pa). The value of P

offset

HiOld 1 Pa New 2 LoOld 1 Pa New 2

is entered in

std,0

the current pressure unit of measure.

Run AutoZ by COM2

AutoZ by COM2 allows the value of P

(see Section 3.5.1  Principle) to be read

std,0

automatically from a DHI RPMx connected to the RPM4-AD COM2 communications port. The RPMx is read and the new P

is calculated

offset

automatically.

Before running AutoZ by COM2, if the AutoZ reference is another RPM4, the RPM4 must be set up so that the active Q-RPT, measurement mode (absolute) and unit of measure are compatible. RPM4 AutoZ by COM2 reads the reference RPM4 “as is” and will use whatever pressure value it responds with to a simple pressure request command.

To access run AutoZ by COM2 press [AutoZ], <2COM2>. The display is:

1. Real time pressure reading (without head correction), pressure unit of measure and measurement mode of the active Q-RPT.

2. Active Q-RPT position designator.

3. Real time reading from the RPMx connected to RPM4’s COM2 communications port.

96.7755 kPa a Hi

Pstd,0:96.7742

Observe the displayed pressures and verify that they are stable. When ready, press [ENT] to cause AutoZ to run. RPM4-AD logs both readings and calculates a new AutoZ offset value. The display is:

Press [ENT] to activate the new value of

or [ESC] to start over.

offset

Old P

New P

offset

: 0.0 Pa

: 3.1 Pa

When AutoZeroing the HL Q-RPT in absolute measurement mode (see

Section 3.2.5), the Old P

offset

/New P

screen display shows both Q-RPTs

offset

simultaneously.

For RPM4-AD to communicate with an RPMx connected to its COM2 port,

the RPM4-AD and the RPMx RS-232 interfaces must be set up properly (see Section 3.5.2.1). If, the RPM4-AD is unable to communicate with an RPMx via COM2

when running AutoZ by COM2, it times out after 6 seconds and

displays <RPM NOT detected>.

3. OPERATION

The value of P

is always displayed and entered in Pascal (Pa).

offset

Run AutoZ by Lo RPT

AutoZ by Lo RPT is available only if the active Q-RPT is the Hi Q-RPT. AutoZ by Lo RPT allows the Lo Q-RPT in an RPM4-AD to serve as the AutoZ reference (source of P the new P

) (see Section 3.5.1,  PRINCIPLE). The Lo Q-RPT is read and

std,0

is calculated automatically.

offset

To access run AutoZ by Lo RPT, first be sure that both Q-RPTs are at atmospheric pressure. This can be accomplished by using SDS to isolate them from the TEST ports and vent them. Press [AutoZ], <3Lo RPT>. The display is:

1. Real time pressure reading (without head correction), pressure unit of measure and measurement mode of the active Q-RPT.

2. Active Q-RPT position designator.

3. Real time reading from the Lo Q-RPT.

96.7755 kPa a Hi

Pstd,0:97.7786

Observe the displayed pressures and verify that they are stable. When ready, press [ENT] to cause AutoZ to run. RPM4-AD logs both readings and calculates a new AutoZ offset value. The display is:

Press [ENT] to activate the new value of

or [ESC] to start over.

offset

Old P

New P

offset

: 0.0 Pa

: 3.1 Pa

The value of P

is always displayed and entered in Pascal (Pa).

offset

3.3.9.3 AUTOZ IN DIFFERENTIAL MODE

 PURPOSE

To compensate for the offset between the Hi Q-RPT and the Lo Q-RPT at the operating “line pressure” in differential measurement mode.

See Section 3.5.1,  Principle for a full explanation of the AutoZ function.

 OPERATION

For the AutoZ function key to run AutoZ, AutoZ must be turned ON for the

active range and measurement mode. AutoZ ON is indicated by <z> to the left of the Q-RPT designator on the first line of the MAIN RUN screen. AutoZ ON and OFF is set using [SPECIAL], <1AutoZ> (see Section 3.5.1). If AutoZ is OFF for the active Q-RPT, and

measurement mode, <AutoZ is off >

is displayed when [AutoZ] is pressed.

To run AutoZ in differential measurement mode, set differential as the measurement mode (see Section 3.3.3) and OPEN SDS if SDS is CLOSED (see Section 3.3.8.1).

ress [AutoZ] from the MAIN RUN screen.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

If the pressure on the Hi Q-RPT is higher than the maximum pressure of the Lo Q-RPT, the display is:

Press [ESC] to return to the run screen. Reduce the pressure on the Hi Q-RPT TEST port and try again.

Reduce Hi Q-RPT P for bypass to open

If the pressure on the Hi Q-RPT is lower than the maximum pressure of the Lo Q-RPT, the RPM4-AD internal bypass valve opens (see Section 5.6 for RPM4-AD A160K/A160K pneumatic schematic) and the display is:

1. Differential measurement (Hi – Lo).

2. Active Q-RPT position designator.

3. Lo Q-RPT measurement.

4. Prompt that RPM-AD is in differential AutoZ mode and to press [AutoZ] when ready.

0.001 kts d Hd *1000.44 ft [AZ]

Note that the RPM4-AD bypass valve is open so the two Q-RPTs are exposed to the same pressure. Adjust the pressure to the desired line pressure value (in the case of airspeed measurement, adjust the pressure to the desired altitude value, this is the altitude at which airspeed will be measured after AutoZ). The line pressure or altitude is displayed on the bottom line of the RPM4-AD display.

Once the pressure has been adjusted to the desired line pressure, allow the pressure to stabilize for at least 60 seconds.

After pressure stabilization, press [AutoZ] or [ENT] to proceed with the AutoZero process.

<Running dif AutoZ> displays for about 7 seconds and operation returns to the MAIN RUN screen. The bypass valve is closed and normal operation in differential mode may resume. The differential measurement value should be very near zero.

Before running AutoZ in differential mode, be sure the pressure applied to the Hi

Q-RPT (TEST (Pt) port) is not higher than the maximum pressure of the Lo QRPT (160 kPa abs (23 psia)). When running AutoZ, the RPM4-AD internal bypass valve connects the Hi and Lo Q-RPTs together so the pressure on the Hi Q-RPT must be safe for the Lo Q-RPT. If running AutoZ in differential mode results in a zero offset that RPM4-AD considers unusually large, <Confirm 0 DP> is displayed when AutoZ is pressed. Check that the pressure applied to the TEST ports is stable and leak free and try to AutoZ again.

Allow the RPM4-AD to stabilize at the line pressure (altitude) for at least

60 seconds before running AutoZ in differential mode.

3.3.10 [ENT]

 PURPOSE

Purpose depends on active DISPLAY mode (see Section 3.3.6).

3. OPERATION

3.4 [SETUP]

 PURPOSE

[SETUP] accesses a menu of functions and features commonly used in setting up and using RPM4-AD.

 OPERATION

To access the SETUP menu, press [SETUP] from the MAIN RUN screen. The display is:

1range 2res 3stab

4UL 5ATest

SETUP menu choices include:

<1range> This function is not used in RPM4-AD models.

<2res> Adjust the resolution of measurement displays (see Section 3.4.2).

<3stab>

Adjust the pressure stability test that is the criterion for the Ready/Not Ready indication (see Section 3.4.3).

<4UL>

<5ATest>

Adjust upper and lower pressure limit alarms (see Section 3.4.4).

This function is not used in RPM4-AD models.

3.4.1 <1RANGE>

This function is not used in RPM4-AD models.

3.4.2 <2RES> (RESOLUTION)

 PURPOSE

To set the resolution with which various measured values and settings are displayed.

 PRINCIPLE

The resolution with which RPM4-AD displays pressure values can be adjusted. The resolution setting determines the number of digits with which pressure is displayed.

The resolution is calculated based on the span of the range and then rounded to the furthest digit to the right. For example, resolution of 0.001 % on a range of 150 kPa is 150 X 0.001 % = 0.0015 which is rounded down to 0.001 kPa.

When the displaying units of altitude, the resolution is adjusted as follows: 1, 0.1, 0.01% resolution: display 1 m or ft.

0.001% resolution: display 0.1 m or ft.

0.0001% resolution: display 0.01 m or ft.

Default resolution is 0.001% of active range span.

 OPERATION

To access the resolution function, press [SETUP], <2res>. The display is:

Display resltn: Hi

0.0010 %FS < and >

Use the cursor control keys to set the desired level of resolution. Press [ENT] to return to the MAIN RUN screen with the new resolution setting active or [ESC] to make no changes.

The resolution setting is Q-RPT specific. A resolution setting made on one Q-RPT does

NOT affect other Q-RPTs.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

The displayed resolution is fixed for altitude units at “1” for 1, 0.1 and 0.01% resolution; 0.1 for

0.001% resolution; 0.01 for 0.0001% resolution.

3.4.3 <3STAB>

 PURPOSE

To view and/or adjust the stability test that is the Ready/Not Ready criterion for the active

See Section 3.2.4 Pressure Ready/Not Ready Indication.

RPT and range.

 PRINCIPLE

RPM4-AD continuously monitors the rate of change of pressure measured by the active Q-RPT and compares this rate to the stability limit to make a Ready/Not Ready determination (see Section 3.2.4 Pressure Ready/Not Ready Indication). The stability function allows the stability

limit to be adjusted by the user to increase or decrease the stability required for a

Ready condition to occur.

Default stability limits are:

RPM4-AD A160K/A160K, all Q-RPTs

Absolute and gauge measurement modes: +/- 3 Pa ( 0.00044 psi) or air data equivalent.

RPM4-AD A350K/A160K, A160K (Lo) Q-RPT

Absolute and gauge measurement modes: +/- 3 Pa ( 0.00044 psi) or air data equivalent.

RPM4-AD A350K/A160K, A350K (Hi) Q-RPT

Absolute, gauge and absolute differential measurement modes: +/- 6 Pa ( 0.00088 psi) or air data equivalent.

The stability limit is separate and different from the Rate DISPLAY function (see Section

3.3.6.2) which allows the current rate of change of pressure to be displayed.

 OPERATION To access the stability setting adjustment, press [SETUP], <3stab>. The display is:

The stability limit is always displayed in the current unit of measure if the unit of measure is a pressure unit. If the unit is an airdata unit, the stability limit is expressed in Pascal (Pa), the SI unit of pressure.

Stability: Hi

3 Pa

Edit the desired stability limit setting if desired. [ENT] activates the stability limit for the active Q-RPT and returns to the MAIN RUN screen Press [ESC] to return to the MAIN RUN screen with no change to the stability limit.

The default stability limit is + 3 Pa (0.00044 psi) for A160K Q-RPTs in all measurement

modes and + 6 Pa (0.00088 psi) for the A350K Q-RPT in all measurement modes.

The stability setting is Q-RPT specific. A stability setting made for one Q-RPT does NOT

affect other Q-RPTs.

3. OPERATION

3.4.4 <4UL> (UPPER LIMIT)

 PURPOSE

To set the upper and lower pressure limit values for a pressure range and measurement mode.

 PRINCIPLE

The UPPER LIMIT function provides the user with settable pressure limits at which an alarm sounds. Absolute and gauge measurement modes (see Section 3.3.3,  PRINCIPLE) have upper limits only. Differential and negative gauge modes have a lower limit.

When the limit is reached, RPM4’s beeper sounds intermittently as long as pressure is outside the limit.

The UPPER LIMIT function has two purposes. First, when UL is set to its default value, it serves as a warning that the maximum pressure of the active Q-RPT is about to be exceeded. Second, UL can be set by the user to a value other than the default value to provide an alarm that a specific pressure limit has been exceeded. This feature is often used to help protect an external device or system on which RPM4-AD is being used to measure pressure. For example, it might be set just over the full scale of a device under test (DUT) that is being calibrated.

The default upper limit is 102 % of Q-RPT maximum working pressure. The default lower

limit (negative gauge mode only ) is – 110 kPa (- 16 psi).

In differential measurement mode (see Section 3.2.6), UL has upper and lower limits. If

the measurement unit is an airspeed unit, there is no lower limit.

In differential measurement mode, the ULs on the Lo Q-RPT and Hi Q-RPT default range are

also active so that line pressure (Lo Q-RPT) and total pressure (Hi Q-RPT) upper limit can be set and monitored in addition to a differential limit.

 OPERATION

To view or edit upper and lower limits press [SETUP], <4UL>.

If the current measurement mode is absolute or gauge or if the active unit of measure is an airspeed unit, there is an upper limit only. The display is:

Upper limit: Hi

1. Entry field for upper limit value in active pressure unit of measure and measurement mode.

163.2 kPa a

Edit the upper limit value as desired. The maximum upper limit is 102 % of default Q-RPT full scale. Press [ENT] to return to the MAIN RUN screen with the new upper limit active. Press [ESC] to return to the MAIN RUN screen with no change to the upper limit.

If the current measurement mode is negative gauge or differential and the unit of measure is not an airspeed unit, there is an upper limit and a lower limit. The display is:

1. Entry field for upper limit value.

2. Entry field for lower limit value and active range pressure unit of measure and measurement mode indication.

Upper: 63.2 Hi

Lower:-110.0 kPa g

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

Edit the upper and lower limit values as desired. Use the cursor control keys to move between the two edit fields. The lower limit must be a negative value. Press [ENT] to return to the MAIN RUN screen with the new upper and/or lower limit active. Press [ESC] to return to the MAIN RUN screen with no change to the limits.

When the upper or lower limit has been exceeded, the display of current pressure flashes and a buzzer sounds for 3 seconds on/2 seconds off intervals. Change the pressure applied to RPM4-AD so that it is within the upper and/or lower limit to return to normal operation.

Upper limit values are specific to each range and measurement mode. Be careful not to

assume that the upper limit set in one measurement mode will apply to the other. For example, if you change the upper limit in gauge mode, the upper limit will not be changed in negative gauge mode.

3.4.4.1 OVER PRESSURE FUNCTION

In addition to the UL function, RPM4-AD has an over pressure function. The over pressure function executes when a Q-RPT measures a pressure that is

104 % of its maximum working pressure. The over pressure function causes the measured pressure display to flash.

SDS closes shutting off the TEST port (see Section 3.2.8). The overpressure function also logs the time and date of the overpressure condition i factory logs to assist in incident diagnosis (see Section Error! Reference source not found.).

To recover from an overpressure condition, cycle RPM4-AD power. Be sure to correct the condition that caused the overpressure before cycling power.

n both user and

3.4.5 <5ATEST>

This function is not used in RPM4-AD models.

3.5 [SPECIAL]

 PURPOSE

[SPECIAL] accesses a menu of RPM4-AD functions and features that are less commonly used or not

normally used in regular operation.

 OPERATION

1AutoZ 2remote 3head

Press [SPECIAL] from the MAIN RUN screen to access the SPECIAL menu. The display is:

Some screens, such as the SPECIAL menu, go beyond the two lines provided by the display. This is

SPECIAL menu choices include:

<1AutoZ> Manage AutoZero function for the active Q-RPT (see Section 3.5.1).

ote> View and edit COM port (RS-232) and IEEE-488 interface settings. Select remote syntax

<2rem

style (see Section 3.5.2).

4SDS 5prefs 6Punit

7intern 8cal 9reset

3. OPERATION

<3head> Set HEAD function gas and height unit of measure (see Section 3.5.3). <4SDS> View and set the temporary and full time ON/OFF and OPEN/CLOSED status of SDS for

Q-RPTs.

<5prefs> View and set screen saver time, keypad sound frequency, unit ID number, time/date,

security protection level (see Section 3.5.5).

<6Punit> Customize <7i

ntern> Access internal functions including on-board barometer viewing, read rate adjustment, incident

the [UNIT] key unit of measure selections (see section 3.5.6).

log viewing (see Section 3.5.7).

<8cal>

View and adjust RPM4, Q-RPT and barometer calibration coefficients (see Sections

3.5.7.5, 5.2, 5.3).

<9reset>

Access RPM4’s various reset functions (see Section 3.5.9).

3.5.1 <1AUTOZ>

 PURPOSE

To offset the RPM4-AD Q-RPTs readings relative to a reference value in order to compensate for possible changes in Q-RPT zero between full recalibrations. In differential measurement mode, to compensate for the difference between the reading of the Hi and Lo Q-RPTs at the “line pressure” at which differential measurements are made.

To assure operation within measurement uncertainty specifications (see Section 1.2.2.1),

it is recommended that AutoZ be run (the value of P

updated) whenever vented in

offset

gauge mode, whenever the line pressure is changed in differential mode and at least every 30 days or when RPM4-AD has been exposed to temperature changes exceeding 15 ºC (36 ºF) in absolute mode.

 PRINCIPLE

AutoZ Purpose and Principle

The main component of the change over time of the RPM4-AD Q-RPTs is change in zero or offset, independent of span. Offsetting or “rezeroing” RPM4-AD Q-RPTs relative to a reference between recalibrations allows measurement uncertainty specifications to be maintained with less frequent full calibrations. AutoZ is also used to compensate for the difference between the Hi and Lo Q-RPT at the “line pressure” at which differential measurements are made. The RPM4-AD AutoZero function (AutoZ) provides full on-board support for the rezeroing process to simplify its application by the user.

The AutoZero function uses three values:

1. P

: The pressure value indicated by the AutoZ reference, the device that is acting as

std,0

the reference relative to which to offset the RPM4-AD Q-RPT.

In absolute measurement mode, the pressure at which AutoZ is performed is normally atmospheric pressure and the P

value can be obtained by RPM4-AD a) by manual

std,0

entry, b) automatically from a DHI RPMx connected to RPM4-AD COM2 communications port, or automatically from the Lo Q-RPT.

In gauge measurement mode, P

is always zero (atmospheric pressure) which is

std,0

supplied by definition when the Q-RPT is vented to atmosphere.

In differential measurement mode, P

is the pressure indicated by the Lo Q-RPT

std,0

when the Hi and Lo Q-RPTs are connected to a common pressure.

2. P

: The pressure reading of the Q-RPT, with no AutoZ offset, at the time AutoZ is

u,0

performed.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

3. P AutoZ offset (P absolute(

offset

std,0

standard. The AutoZ function manages the determination, storage and application of P

, P

offset,G

represents the difference between the Q-RPT reading (P

offset,A

and P

) and the indication of the AutoZ reference (P

u,0

: The difference between the reading of the Q-RPT with no

offset,D

) or differential (D) measurement mode:

offset

= P

u,0

- P

std,0

) for gauge (G),

std,0

) and the AutoZ standard

u,0

). This value is used to correct the RPM4-AD Q-RPT so it agrees with the AutoZ

offset

to correct the Q-RPT in absolute, gauge and differential measurement modes.

When the Q-RPT is calibrated, P intervals using the AutoZ function. The most recent value of P

is set to zero. P

offset

is then redetermined at regular

offset

is applied to the Q-RPT

offset

reading to correct for change in zero.

The AutoZ function can be turned ON and OFF. Table 11 summarizes the effect of AutoZ ON and OFF.

AutoZ in absolute measurement mode

RPM4-AD Q-RPTs are intrinsically absolute. They have an evacuated and sealed reference.

In absolute measurement mode, the source of P

must be an absolute pressure, nominally

std,0

atmospheric pressure, with uncertainty significantly better than that of the Q-RPT that is being AutoZeroed.

When a Q-RPT is in absolute measurement mode with AutoZ ON, absolute pressure is calculated as:

= Pu - P

abs

offset,A

In absolute measurement mode, running the AutoZ function to update the AutoZ value (P

), is initiated by the operator using [AutoZ] (see Section 3.3.9.2).

offset,A

AutoZ in gauge and negative gauge measurement modes, dynamic compensation for atmospheric pressure

RPM4-AD Q-RPTs are intrinsically absolute but they are also used in gauge and negative gauge (difference from atmosphere) measurement modes (see Section 3.3.3, 

PRINCIPLE). Gauge measurement mode is achieved by subtracting the value of atmospheric pressure from the Q-RPT’s absolute reading using AutoZ and by dynamically compensating for changes in atmospheric pressure between opportunities for AutoZ to execute (see Section 3.2.2).

In gauge measurement modes, the value of P

is always zero gauge pressure. Zero

std,0

gauge pressure, by definition, is applied to the Q-RPT when it is vented to atmosphere. Gauge pressure is the measured absolute pressure, P

= Pu - P

gauge

offset,G

, minus P

offset,G

When AutoZ is ON, dynamic compensation for atmospheric pressure is also applied to compensate for changes in atmospheric pressure as measured by a barometer (ΔP AutoZ updates (see Section 3.2.2). The measured gauge pressure is calculated using ΔP to correct the value of P

offset.G

gauge

= Pu - P

offset.G

- ΔP

atm

In gauge measurement mode, running the AutoZ function to update the value of P initiated by the operator using [AutoZ] (see Section 3.3.9.1). ΔP

resets when AutoZ is run

atm

) between

atm

atm,0

atm

, is

is then updated continuously as new atmospheric pressure measurements are made by the barometer.

3. OPERATION

When gauge or negative gauge mode is first activated, the value of P

subtracted

offset.G

from the absolute pressure reading to achieve gauge pressure is standard atmosphere of

101.325 kPa. This can cause a large zero error when gauge mode is activated if atmospheric pressure is significantly different from standard atmospheric pressure. When gauge mode is activated, always press [AutoZ] to run AutoZ and obtain an actual value of P

offset.G

AutoZ in differential measurement mode

RPM4-AD supports differential measurement mode (see Section 3.2.6) in which the measured pressure is the difference between the

pressure measured by the Hi Q-RPT (Pt)

and the Lo Q-RPT (Ps) (Hi – Lo, Pt – Ps).

In differential measurement mode, the purpose of AutoZ is to compensate for the offset between the Hi and Lo Q-RPT indications at the “line pressure” at which the differential pressure is being measured. In differential measurement mode, when the active unit of measure is an airspeed unit, the line pressure is altitude. The value of P

is the pressure

std,0

measured by the Lo Q-RPT at the time of AutoZ.

In differential measurement mode, with AutoZ ON, differential pressure is calculated as:

differential

= PHi - PLo - P

offset,D

In differential measurement mode, AutoZ is run when initiated by the operator pressing [AutoZ]. RPM4-AD’s differential mode AutoZ function connects both RPTs together internally to the TEST (Ps) port to be sure they are exposed to the same pressure.

AutoZ ON/OFF

The AutoZ function can be turned ON and OFF, separately for gauge, absolute and differential measurement modes and for each Q-RPT. Table 11 summarizes the effect of AutoZ ON and OFF.

Table 11. AutoZ ON and OFF

MEASUREMENT

MODE

Absolute

Gauge or

negative gauge

Differential

AutoZ

STATUS

ON YES

OFF NO

ON YES

OFF

ON YES

OFF NO

offset

APPLIED

YES

ΔP

atm

APPLIED

Not Applicable

AutoZ

ROUTINE

RUNS

When initiated

by operator

Not available

When initiated

by operator

When initiated

by operator

Not available

Recommendations for the Use of the AutoZ Function

The AutoZ function provides a powerful and easy to use tool for improving the stability over time of RPM4-AD Q-RPTs and maximizing the recalibration interval by compensating for zero drift between full recalibrations. In differential measurement mode, it minimizes the uncertainty in the differential pressure due to the offset between the Hi and Lo Q-RPTs at the “line pressure” (altitude in air data measurement). The following simple recommendations will help assure that you use the AutoZ feature to best advantage.

• In gauge and differential measurement mode: Always leave AutoZ ON when operating.

• In absolute measurement mode: Always leave AutoZ ON when operating if the AutoZ

routine has been run regularly using a valid atmospheric reference.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

• To assure operation within measurement uncertainty specifications (see Section 1.2.2.1),

run AutoZ whenever vented in gauge mode, whenever the line pressure is changed in differential mode and at least every 30 days or when RPM4-AD has been exposed to temperature changes exceeding 15 ºC (36 ºF) in absolute mode.

• In absolute measurement mode: Run AutoZ only when a reference whose

measurement uncertainty is known to be significantly better than that of the Q-RPT to be AutoZeroed is available. The best possible reference with which to run AutoZ in absolute measurement mode is a gas operated piston gauge (such as a DHI PG7601) applying atmospheric pressure to the RPM4-AD TEST port. The best day to day reference is a properly calibrated DHI RPM4 BA100K/BA100K interfaced directly as an external device to the RPM4-AD COM2 port.

• In absolute measurement modes: Allow the RPM4-AD to stabilize at atmospheric

pressure and ambient temperature for 10 to 15 minutes before running AutoZ.

The AutoZ function and values are Q-RPT AND measurement mode (absolute, gauge or

differential) specific.

 OPERATION

[SPECIAL], <1AutoZ> is to perform AutoZ management functions such as turning AutoZ

ON and OFF. In day to day operation, to RUN the AutoZ routine that rezeroes the Q-RPTs, use [AutoZ] (see Section 3.3.9).

To access the RPM4-AD AutoZ function press [SPECIAL], <1AutoZ>. The display is:

1. Active Q-RPT designator.

2. Indication of active measurement mode (<abs> for absolute, <gage> for gauge and negative gauge, <dif> for differential).

3. Indication of whether AutoZ is currently ON or OFF for this Q-RPT and measurement mode.

1off 2view Hi

3edit abs ON

Select <1off> (or <1on>) to change the AutoZ status for the current Q-RPT and measurement mode from ON to OFF or vice versa.

AutoZ ON is indicated by a <z> in the MAIN RUN screen, top line, fourth character from

the right. When AutoZ is OFF, the character is blank.

Select <2view> to view the current value of P

should be zero when the RPM4-AD is new or has just been calibrated. P

offset

be roughly equal to atmospheric pressure when operating in gauge mode.

Select <3edit> to edit the value of P

offset

(see Section 3.5.1.1). This function is not normally used. In normal be used to obtain the value of P

The value of P

is always displayed and entered in Pascal (Pa).

offset

(see Section 3.3.9).

offset

for the active Q-RPT(s) and measurement mode.

offset

should

offset

for the active Q-RPT and measurement mode

operation, [AutoZ] should

3. OPERATION

3.5.1.1 EDIT AUTOZ

The edit AutoZ function should be used with great caution as entering

inappropriate values and turning AutoZ ON may result in out of tolerance measurements. In normal operation, the value of the AutoZ offset, P should be changed by running AutoZ using [AutoZ] (seen Section 3.3.9). Before editing P

To edit the current P

, see Section 3.5.1,  PRINCIPLE.

offset

value for the active Q-RPT and measurement mode,

offset

press [SPECIAL], <1AutoZ>, <3edit>. The display is:

offset

1. Indication of active measurement mode (<abs> for absolute, <gage> for gauge and negative gauge, <dif> for differential).

2. Active Q-RPT for which P

3. Edit field for value of P

Edit P

as desired and press [ENT] to activate the new value. Press [ESC] to

offset

is being edited.

offset

Poffset, Abs Hi

8.4 Pa

abandon changes.

If editing the HL (parallel mode) P

values, the editing display shows the

offset

values for both Q-RPTs simultaneously:

1. Indication of measurement mode for which this is P

2. Edit field for value of Hi Q-RPT P

3. Indication that this is the Hi Q-RPT P

4. Edit field for value of Lo Q-RPT P

5. Indication that this is the Lo Q-RPT P

The value of P

(<a> for absolute, <g> for gauge).

offset

is always in Pascal (Pa). The value of P

offset

off,a: 1 Pa Hi

Poff,a: -1 Pa Lo

is entered in

std,0

the current pressure unit of measure.

3.5.2 <2REMOTE>

 PURPOSE

To configure the RPM4-AD COM1, COM2 and IEEE-488 (GPIB) communication ports. To test COM1 and COM2 communications. To select the remote programming communications format.

 PRINCIPLE

The RPM4-AD has two RS-232 communications ports referred to as COM1 and COM2 and a single IEEE-488 (GPIB) port. COM1 or the IEEE-488 port is for communicating with a host computer (see Section 4), and COM2 is reserved for communicating with an external device (e.g. an RPMx, a multimeter, [SPECIAL], <2remote>.

RPM4-AD has two remote communications formats, classic and enhanced (see Section 4.3).

hich of these is active can be selected.

A self test is supplied for RS-232 communications. The self test allows verification that the RPM4-AD RS232 ports (COM1 and COM2) are operating properly and that a valid interface cable is being used.

etc.). These ports’ settings can be viewed and changed using

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

 OPERATION

To access the communications settings, press [SPECIAL], <2Remote>.

• Select <1COM1> to view and edit COM1 settings (see Section 3.5.2.1.).

• Selec

t <2COM2> to view and edit COM2 settings (see Section 3.5.2.1.).

t <3IEEE> to view and edit IEEE-488 settings (see Section 3.5.2.2). t <4format> to select the remote communications command format (see Section 3.5.2.3). t <5RS232test> to run the COM1 and COM2 communications test (see Section 3.5.2.4).

3.5.2.1 <1COM1, 2COM2>

The COMx ports can be set for specific communications settings. The settings are baud rate, parity, data bits and stop bits. The available options are:

Baud 300, 600, 1 200, 2 400, 4 800, 9 600, 19 200, 28 800, 38 400

Parity NONE, ODD or EVEN

Length 7 or 8

Stop Bit 1 or 2

The default is <2 400, E, 7,1> for both COM1 and COM2.

The user can also specify one or two termination characters as well as define these characters. These are referred to as “Term1” and “Term2”. These define the characters that mark the end of commands that are sent to the RPM4-AD. The RPM4-AD looks for an ASCII(13) (carriage return) to terminate a received command but responds with both and ASCII(13) (carriage return) and an ASCII(10) (line feed). There are no other options.

3.5.2.2 <3IEEE-488>

The IEEE-488 port’s primary address can be set from 1 to 31 in this screen. The factory default value is 10. Secondary addressing is not used or supported. This address must not conflict with the address of any other device on the same IEEE-488 bus.

The receiving terminating character must be a line feed and EOI. Carriage returns are ignored if received. The RPM4-AD sends a line feed and asserts the EOI line to terminate a reply. These settings are fixed to agree with IEEE Std. 488.2. If you change the address, the IEEE interface will reset (PON) and become idle.

3.5.2.3 <4FORMAT>

The RPM4-AD has two different syntax formats available for the remote program commands.

The classic remote command format is highly intuitive and conforms with previous DHI PPC and RPM products.

The enhanced remote command format generally uses the same commands as the classic format, but in addition it follows the syntax, format, and status reporting features of IEEE Std 488.2.

The details of each format are covered in Section 4.3.

[SPECIAL], <2rem syntax to be selected. The cursor is on the active format. Select <1classic> or <2enhanced> as desired.

ote>, <4format> allows the remote program command

3. OPERATION

3.5.2.4 <5RS232 SELF-TEST>

The RS232 self-test is provided to check the RPM4-AD COM ports and the interface cable independently of an external device or computer.

If you are having difficulty communicating with RPM4-AD from a host computer using RS232, the RS232 self test can help establish that the

RPM4-AD COM1 port you are trying to communicate with and the interface cable you are using are good.

To run a self test of the RS232 ports (COM1 and COM2), press [SPECIAL], <2remote>, <5RS232test>.

The display prompts you to connect COM1 to COM2 using a standard pin-to-pin DB-9F to DB-9M RS232 cable (see Section 4.2.1.1, 4.2.1.3).

the cable has been installed, press [ENT] to run the self-test. The test is first

Once executed in the COM1→COM2 direction and then in the COM2→COM1 direction.

If the COM1→COM2 test passes: <PASSED> displays briefly and the test

proceeds to COM2→COM1.

If COM2→COM1 passes: <PASSED> is displayed briefly followed

by the conclusion, <The RS232 test has

PASSED>.

If a test fails: Execution is suspended until [ENT] is

pressed.

The RPM4-AD RS232 test can fail for three reasons:

1. The RS232 cable being used is incorrect (Section 4.2.1.1, 4.2.1.3 for

information on the correct cable).

2. COM1 and COM2 do NOT have the same serial communications settings

therefore cannot communicate together (see Section 3.5.2.1 to set

and the COM ports).

3. COM1 or COM2 is defective. The reason for failed communications is almost always a cable or incorrect

RS232 interface settings. Be sure that these are correct before concluding that a COM port is defective.

3.5.3 <3HEAD>

 PURPOSE

To view or change the properties of the HEAD function (see Section 3.3.7) including the unit of measure of length for head height entry and the test gas species for density calculations.

 OPERATION

From the MAIN RUN screen, pressure [SPECIAL], <3Head>.

Select the desired height unit of measure and press [ENT].

Select the gas species and press [ENT].

Use [HEAD] to set a head height if desired (see Section 3.3.7).

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

3.5.4 <4SDS>

 PURPOSE

See Section 3.2.8 for complete information on RPM4’s SDS (Self Defense System) feature.

To open and close SDS temporarily or to turn the SDS function ON and OFF full time.

 PRINCIPLE

SDS is a self defense system to protect RPM4-AD Q-RPTs from overpressure (see Section 3.2.8). Normally,

opening and closing SDS is performed automatically by the RPM4-AD or by the operator

using the [SDS] key.

[SPECIAL], <4SDS> gives further control over the SDS function. This includes: a) temporarily opening or closing SDS on either the Hi or Lo Q-RPT (see Section 3.5.4.1), and; b) turning OFF SDS so that it is open full time and RPM4-AD can be operated as if SDS were not installed (see Section 3.5.4.2).

The temporary opening or closing of SDS allows the

SDS open/closed state to be set to the desired state immediately. Following the change, normal automated operation of SDS and control using the [SDS] continues. This function is often used to open SDS on the inactive Q-RPT.

Setting the SDS function to full time OFF eliminates the SDS function completely for both Q-RPTs (except for reaction to an overpressure condition) until SDS is set to full time ON again.

3.5.4.1 <1TEMP OPEN/CLOSE>

 OPERATION

See Section 3.2.8 for complete information on RPM4’s SDS (Self Defense

System) feature.

To temporarily open or close the SDS of the Hi or Lo Q-RPT press [SPECIAL], <4SDS>, <1temp open/close>. Select the Hi or Lo Q-RPT. The next display is:

The cursor is on the current state of SDS for the designated Q-RPT. Select <1close> to close SDS or <2open> to open SDS and return to the MAIN RUN screen. Press [ESC] to return without making changes.

SDS temporary: Hi 1close 2open

If <2open> is selected and SDS for the Q-RPT is not already open, the SDS opening screen with indication of the maximum pressure of the Q-RPT is displayed. This is the same screen used when opening SDS using the [SDS] key (see Section 3.3.8). Check that the pressure applied to the Q-RPT module TEST port does not exceed the Q-RPT’s Pmax!

value before confirming that SDS should be

opened.

SDS temporary open and close in parallel measurement mode (HL)

In parallel measurement mode (HL Q-RPT), the active TEST port is the TEST(Ps) port in absolute measurement mode and the TEST(Pt) port in gauge

measurement mode. Opening SDS using [SDS] opens the active TEST port and the internal bypass valve between the two Q-RPTs (see Section 5.6 for schematics and valve states) while the inactive TEST port is left closed. Closing SDS using [SDS] closes the active TEST port amd the internal

Q-RPT bypass

valve. When SDS is open, SDS temporary open can be used to open the

3. OPERATION

inactive TEST port. When SDS is open, SDS temporary close can be used to isolate and vent the specified Q-RPT.

Opening SDS with a pressure greater than Pmax! applied to the test port

may cause overpressure damage to the Q-RPT.

3.5.4.2 <2FULL TIME ON/OFF>

See Section 3.2.8 for complete information on RPM4’s SDS (Self Defense

System) feature.

 OPERATION

Turning SDS “full time OFF” eliminates normal SDS operation so that the

active TEST port remains open. However, the SDS overpressure function (see Section 3.4.4.1) remains active.

To turn SDS full time ON/OFF, press [SPECIAL], <4SDS>, <2full time on/off >. The next display is:

The cursor is on the current state of SDS ON/OFF. Select <1on> to set SDS for normal operation and return to the MAIN RUN screen. Select <2off> to open SDS permanently so operation is as if SDS were not installed. Press

SDS full time: 1on 2off

[ESC] to return without making changes.

If <2off> is selected and SDS is not already open, the SDS opening screen with indication of the maximum pressure of the Q-RPT is displayed. This is the same screen used when opening SDS using the [SDS] key (see Section 3.3.8). Check that the pressure applied to the Q-RPT module TEST port does not exceed the Pmax! value before confirming that SDS should be opened.

Opening SDS with a pressure greater than Pmax! applied to the TEST port

may cause overpressure damage to the Q-RPT.

With SDS “full time OFF”, when using parallel measurement, the active TEST

port is still switched between the Ps and Pt port depending upon measurement mode (see Section 3.2.5).

3.5.5 <5PREFS>

 PURPOSE

To access a menu of RPM4-AD operational preferences and functions.

 OPERATION

To access the PREFS menu press [SPECIAL], <5prefs>. The display is:

1ScrSvr 2sound 3time

4ID 5level

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

The PREFS menu includes:

<1ScrSvr> View and change the screen saver activation time (see Section 3.5.5.1).

<2sound>

<3ti

me> View and edit the internal time and date settings (see Section 3.5.5.3).

<4I

D> View the RPM4-AD serial number (SN) and view or edit the ID number

View and change the key press sounds (see Section 3.5.5.2).

(see Section 3.5.5.4).

4level> View and set user security level and/or password (see Section 3.5.5.5).

3.5.5.1 <1SCRSVR>

 PURPOSE

To adjust the idle time after which RPM4’s SCREEN SAVER activates.

 PRINCIPLE

RPM4-AD has a SCREEN SAVER function which causes the display to dim after a front panel key is NOT pressed for a certain amount of time. The default is for the screen saver to activate after 10 idle minutes. The screen saver activation time can be adjusted by the user or screen saving can be completely eliminated.

Setting screen saver time to zero eliminates the SCREEN SAVER function so

that the display permanently remains at full brightness.

 OPERATION

To access the SCREEN SAVER function, press [SPECIAL], <5prefs>, <1ScrSav>. Edit, in minutes, the idle time after which screen saver will activate

to dim the screen. Set the time to zero to eliminate the SCREEN SAVER function.

3.5.5.2 <2SOUND>

 PURPOSE

To adjust or suppress the RPM4-AD valid key press sound.

 PRINCIPLE

RPM4-AD provides audible feedback by a brief “beep” when a valid key press is made. The tone frequency of this beep may be selected from three choices or it may be completely suppressed. Invalid key presses are indicated by a descending two tone “blurp” which cannot be suppressed.

 OPERATION

To access the keypad sound adjustment function press [SPECIAL], <5prefs>, <2sound>.

Select between <2lo>, <3mid> or <4hi> to adjust the valid key press tone frequency.

Select <1none> to suppress the valid key press tone.

The sound function only affects the valid key press tone. The invalid key

press tone and other RPM4-AD sounds cannot be adjusted or suppressed.

3. OPERATION

3.5.5.3 <3TIME>

 PURPOSE

To view and edit the RPM4-AD internal time and date settings.

 OPERATION

To access the TIME function press [SPECIAL], <5prefs>, <3time>. The display is:

Edit: 1time 2date

08:32:11 am 20030125

Select <1time> to edit the time. Edit hours, then minutes, then am/pm by pressing [ENT] after each entry. Seconds go to zero when minutes are entered. This can be used to synchronize the time with a time standard.

Select <2date> to edit the date. The date must be specified in YYYYMMDD format.

The RPM4-AD date and time are set to United States Mountain Standard

Time in the final test and inspection process at the factory. If desired, use the TIME and DATE function to set your local time and date.

3.5.5.4 <4ID>

 PURPOSE

To view or edit the RPM4-AD user ID and to view the RPM4-AD serial number.

 OPERATION

To access the ID function press [SPECIAL] and select <5prefs>, <2ID>.

Select <1view> to view the current ID.

Select <2edit> to edit the ID.

The ID has twelve characters. When the edit screen is opened, the cursor is on the first character. Numerical values can be entered directly from the keypad. In addition, the cursor control keys can be used to toggle through a list of available alphanumeric characters. Holding the key slews through the characters. Character order going up is: blank space, symbols, lower case letters, upper case letters, numbers. After selecting a character, press [ENT] to activate it and move to the next character field.

When a character is selected the cursor moves to the next character. To leave a blank character, press [ENT] with the field for that character blank. Use this for the trailing characters if the ID being entered is less than twelve characters.

After the last of the twelve characters has been entered, the <Save ID?> option is offered. Select <1no> to return to the ID edit screen. Select <2yes> to save the edited ID.

The ID can be set remotely from a computer which is quite a bit more

convenient than entering characters from the keyboard (see Section 4.4.4, ID command). The ID is not cleared or reset by any RESET function (see Section 3.5.9).

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

3.5.5.5 <5LEVEL> (SECURITY)

 PURPOSE

To set user protection levels to restrict access to certain functions and to edit the password required for changing user levels.

 PRINCIPLE

RPM4’s front panel user interface provides the means to access all RPM4-AD user defined data, settings and functions including calibration data. Inadvertent, uninformed or unauthorized altering or deleting of data, settings and functions could require extensive reconfiguration by the user and might cause invalid readings and behavior. For these reasons, depending upon the application in which RPM4-AD is being used, it may be desirable to restrict access to some functions. The user level function provides a means of restricting access to certain functions. Four different levels of security are available.

Access to changing security levels can be left open, or be protected by a password.

Security Levels

The security levels are structured to support typical operating environments as follows:

None This level is intended for use only by the system manager and/or

calibration facility. It allows access and editing in all areas including critical metrological information.

Low Low security is designed to protect the specific metrological

information and SYSTEM DIAGNOSTIC AND MAINTENANCE functions of the system against accidental alteration. It is intended for an advanced operator performing many different tasks. Low security is the default user level setting.

Medium Medium security is designed to protect specific metrological

information in the system and to assure that the RPM4-AD is operated using consistent operational parameters.

High High security is designed to protect all operating parameters. It is

intended to minimize operator choices, for example to perform repeated identical calibrations under consistent conditions.

RPM4-AD is delivered with the security level set at low to avoid inadvertent

altering of critical internal settings but with access to changing security levels unrestricted. It is recommended that the low security level be maintained at all times. If there is a risk of unauthorized changing of the security level, changing authority should be password protected (see  OPERATION of this section).

The security levels are structured to support typical levels of operation as shown in Table 12. Specifically, the security levels prevent execution of the functions accessed by the key strokes marked by “•”:

3. OPERATION

Table 12. Security levels

FUNCTION LOW MEDIUM HIGH

[RANGE]

[ENT]

[UNIT]

[MODE]

[AutoRange]

[LEAK CK]

[DISPLAY]

[HEAD]

[SDS]

[AutoZ] (in absolute mode)

[SETUP]

[SETUP], <1range>

[SETUP], <2res>

[SETUP], <4UL>

[SPECIAL]

[SPECIAL], <1AutoZ>

[SPECIAL], <1AutoZ>, <1on/1off>

[SPECIAL], <1AutoZ>, <3edit>

[SPECIAL], <2remote> [SPECIAL], <2remote>, make changes

[SPECIAL], <3head>

[SPECIAL], <4SDS>

[SPECIAL], <5pref>, <1ScrSvr>

[SPECIAL], <5pref>, <2sound>

[SPECIAL], <5pref>, <3time> [SPECIAL], <5pref>, <3time>, make changes

SPECIAL], <5pref>, <4ID>, <2edit>

[SPECIAL], <6Punit>

[SPECIAL], <7internal>

[SPECIAL], <7internal>, <3RPT2x> [SPECIAL], <7interrnal>, <5log>, clear log

[SPECIAL], <8cal> [SPECIAL], <8cal>, <2edit> under any selection

[SPECIAL], <4reset>

[SPECIAL], <4reset>, <4cal>

[SPECIAL], <4reset>, <5all>

Remote communications disabled

“•” indicates the function/menu is NOT accessible.

•

• •

•

• •

•

• •

•

• •

•

• •

• • •

•

• •

• • •

• •

• • •

• •

• • •

• •

• • •

•

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

 OPERATION

RPM4-AD is delivered with no active password and access to the User Level menu is open. The user level is set to <1Low>. User levels can be changed freely until a password has been created.

To access the LEVEL function press [SPECIAL], <5prefs>, <5level>. The display is:

Selecting <1change user level> brings up the restriction menu:

1change user level

2edit password

Restrictions: 1none

2low 3medium 4high

The cursor is on the current restriction level. Select a different level or or [ESC] back to the MAIN RUN screen.

If no password is active, selecting <2edit password> displays the user

password and allows it to be edited.

Password: pppppp

0 disables password

Once a password has been entered, the user level cannot be changed without

reentering the password.

Passwords can be up to six numbers in length and cannot start with a zero. If <0> is entered, the password is made inactive and the user will not be required to enter a password to access the user level menu. This condition, with a security level of <2low>, is the factory default.

If there is an active password, the RPM4-AD password entry screen appears. The user must enter the user defined password or the factory

RPM4 SNnnnn-xx

Password: pppppp

secondary password to proceed further:

The first field, <nnnn>, is the serial number of the RPM4, followed by a second field, <xx>, that represents the number of times that a secondary password has been used. The second field, <xx>, increments each time a secondary password is used. The third field, <pppppp> is for user entry of the normal password.

The factory secondary password is available in case the user’s password has

been misplaced or forgotten. It can be obtained by contacting a DHI Authorized Service Center (see Table 34). The factory secondary

password

is different for all RPM4’s and changes each time it is used.

3.5.6 <6PUNIT>

 PURPOSE

To customize the choice of units of measure available in the [UNIT] key menus.

 PRINCIPLE

The [UNIT] function key makes available a choice of six default units of measure depending on the active Q-RPT and measurement mode (see Section 3.3.2 and Table 9, Table 10). RPM4-AD also supports many commonly used units that These units can be made available for active selection by customizing the UNIT function using [SPECIAL], <6PresU>. The typical user customizes the [UNIT] function key displays

are not included in the default set up.

3. OPERATION

to support his/her six most commonly used units. This allows RPM4-AD to offer a very wide selection of units without having to deal with a long unit list in day to day operation.

 OPERATION WITH RPM4 A160K/A160K

To customize the [UNIT] function key, press [SPECIAL], <6PresU> from the MAIN RUN screen. The display is:

Select the Q-RPT and measurement modes for which the UNIT function menu is being customized. The <other> selection covers the measurement modes other than absolute (gauge, negative gauge, differential) when applicable.

Setup unit for Q-RPT

1Hi abs 2Hi other

3HL abs 4HL other

The next display is:

1. Entry field to specify which unit position (1 to 6) of the UNIT function menu is to be changed.

Set up unit #6

for Hi absolute mode

Enter the number of the unit position on the UNIT function menu that you would like to change. The next display lists the types of measurement unit supported by RPM4-AD.

Select the unit type. <SI> and <other> are pressure units. Not all unit types are available for all Q-RPTs and measurement modes.

Unit#6 1SI 2other 3altitude 4airspeed

5user

See Table 13 for definition of unit type availability by Q-RPT and measurement mode. If the measurement unit type selected is not

available for the selected Q-RPT and/or measurement mode, <Not available on [Q-RPT], [measurement mode]> is displayed. Press [ESC] to return to the unit type selection screen and select a valid unit type.

Table 13. Available unit of measure types by active Q-RPT and measurement mode,

RPM4-AD A160K/A160K (rotary wing)

UNIT TYPE Q-RPT MEASUREMENT

Yes

Hi and

No Yes

Yes

parallel

<HL>

MODE

Absolute <a>

Gauge,

negative gauge <g>

PRESSURE ALTITUDE AIRSPEED USER

Yes

No2

Yes

1. Best measurement uncertainty .

2. Altitude measured by Lo Q-RPT can be displayed while measuring airspeed.

Absolute <a>

Gauge,

negative gauge <g>,

differential <d>

Yes No No Yes

Yes No

Yes

After selecting the unit type, select the unit. Table 14 lists the unit selection menus by unit type.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

Table 14. UNIT function - available units of measure

<4AIRSPEED> <1SI>1 <2OTHER> <3ALTITUDE>

<1calibrated> <2true>

<1Pa> <2hPa> <3kPa>

<4MPa>

<5mbar>

<6bar> <7mmHg> <8mmWa>

1. SI pressure units include certain units based on SI such as mmWa.

<1psi> <2psf>

<3inHg> <4inWa> <5kcm2>

<6Torr> <7mTor>

<1feet>

<2meters>

<1kts>

<2mph>

<3km/h>

<4mach>

<1KTS> <2MPT>

<3KM/H>

<4MACH>

<4USER>

If <3airspeed> is selected, the type of airspeed unit must be selected. The display is:

Select <1calibrated> for airspeed calculated from the differential pressure (Qc) assuming a fixed altitude and air temperature (see Section 7.2 for information

on RPM4-AD unit conversions). This is the most commonly used air speed unit. Select <2true> for airspeed calculated from differential

Airspeed type:

1calibrated 2true

pressure (Qc) taking into consideration altitude (Ps) and a user entered temperature value.

If <2true> is selected, the default air temperature to be used in calculating airspeed must be entered. The display is:

True airspeed

1. Entry field for default temperature to be used in true airspeed calculation. The default value is 15 ºC.

default T: 15.0 ºC

Enter the default temperature value. This value can be edited when a true airspeed unit is selected in the [UNIT] menu. Changing this value changes the default temperature value for any true airspeed units that have already been setup.

In RPM4-AD displays, calibrated airspeed units are represented in lower case (e.g. kts)

and true airspeed units are represented in upper case (e.g. KTS).

If <4user> is selected, the user unit must be defined. The display is:

Define user unit:

1. Entry field.

1.000000 unit/Pa

Enter the number of user units per Pascal (Pa) in the entry field. Pressing [ENT] defines the user unit and returns to the <Set up unit #n> screen.

The user defined unit label can be customized to any alphanumeric, four character label

using the remote command “UDU” (see Section 4.4.4).

See Section 7.2 for information on the unit of measure conversions used by RPM4-AD.

3. OPERATION

 OPERATION WITH RPM4 A350K/A160K

To customize the [UNIT] function key, press [SPECIAL], <6PresU> from the MAIN RUN screen. The display is:

Select the Q-RPT for which the UNIT function menu is being customized.

Setup UNIT for Q-RPT

1Hi 2Lo

The next display is:

1. Q-RPT for which UNIT function menu is being customized.

Measurement mode: Hi 1absolute 2other

Select the measurement mode for which the UNIT function key menu is being customized.

1. Entry field to specify which unit position (1 to 6) of the UNIT function menu is to be changed.

Set up unit #6

for Hi absolute mode

Enter the number of the unit position on the UNIT function menu that you would like to change.

The next display lists the type of measurement units supported by RPM4-AD.

Select the unit type. <SI> and <other> are pressure units.

Unit#6 1SI 2other 3altitude 4airspeed

5user

See Table 15 for definition of unit type availability by Q-RPT and measurement mode. If the measurement unit type selected is not

Table 15. Available unit of measure types by active Q-RPT and measurement mode,

RPM4-AD A350K/A160K (fixed wing)

MODE

<Lo>

1. Altitude measured by Lo Q-RPT can be displayed while measuring airspeed.

Absolute <a>

Gauge,

negative gauge <g>

Absolute <a>

Gauge,

negative gauge <g>,

differential <d>

PRESSURE ALTITUDE AIRSPEED USER

Yes

Yes No No Yes

Yes No

UNIT TYPE Q-RPT MEASUREMENT

Yes

No Yes

Yes

After selecting the unit type, select the unit. Table 14 lists the unit selection menus by unit type.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

If <user> is selected, the user unit must be defined. The display is:

1. Entry field.

Define user unit:

1.000000 unit/Pa

Enter the number of user units per Pascal (Pa) in the entry field. Pressing [ENT] defines the user unit and returns to the <Set up unit #n> screen.

The user defined unit label can be customized to any alphanumeric, four character label

using the remote command “UDU” (see Section 4.4.4).

See Section 7.2 for information on the unit of measure conversions used by RPM4-AD.

3.5.7 <7INTERNAL>

 PURPOSE

To view, set, adjust, and maintain various aspects of RPM4’s internal operation.

 OPERATION

To access the internal selections press [SPECIAL], <7internal>. The display is:

The INTERNAL menu choices include:

<1baro> View the real time output of the on-board barometer, if present (see Section

3.5.7.1).

1baro 2ReadRt 3RPT2x

4lo vnt 5log

<2ReadRt>

Turn ON and OFF RPM4’s automated, rate of change dependent, reading integration rate feature (see Section 3.5.7.2).

<3RPT2x>

The ability to turn ON and OFF parallel measurement mode is not used in RPM4-AD. Parallel measurement mode is always enabled in RPM4-AD A160K/A160K (rotary wing) (see Section 3.2.5). Parallel mode is not available in RPM4 A350K/A160K (fixed wing).

4lo vnt> This feature is not used in RPM4-AD models..

<5log> View the RPM4-AD incident log (see Section Error! Reference source not

found.).

3.5.7.1 <1BARO>

 PURPOSE

To view the value of atmospheric pressure as measured by the RPM4-AD onboard barometer.

 PRINCIPLE

RPM4-AD is equipped with a separate, on-board barometer. The atmospheric pressure measurements made by the on-board barometer are used for dynamic compensation of atmospheric pressure when making gauge pressure measurements (see Sections 3.3.3,  PRINCIPLE and 3.2.2).

3. OPERATION

See Section 5.5, Figure 7 and Section 5.6, Figure 8, Figure 9 for a photo and

schematics showing the position of the on-board barometer in RPM4-AD.

The on-board barometer is a low accuracy sensor used only for measuring

small changes in atmospheric pressure over short periods of time (see Section 3.2.2). RPM4-AD measurement uncertainty does not depend on the measurement uncertainty of the on-board barometer.

 OPERATION

To view the current reading of the on-board barometer press [SPECIAL], <7internal>, <1baro>. The display is in the active pressure unit of measure

(see Section 3.3.2). The display resolution is fixed to 0.01 Pa, or its equivalent.

The barometer pressure reading is displayed in the current unit of measure.

If the current unit of measure is airspeed, the barometer pressure reading is displayed in the default or last selected altitude unit. To display the barometer in the a desired unit of pressure, return to the main run screen and use [UNIT] to set the desired unit (see Section 3.3.2).

3.5.7.2 <2READRT>

 PURPOSE

To turn ON and OFF RPM4’s automated, rate of change dependent, reading integration rate feature.

 PRINCIPLE

To obtain maximum resolution from RPM4-AD Q-RPT pressure measurements, an integration time of about 1.2 second per reading is used. In most situations, maximum precision is needed when pressures are stable so a relatively slow display update rate presents no disadvantage. However, when pressure is changing quickly, more rapid pressure updates are usually more important than obtaining maximum precision on individual readings. The RPM4-AD read rate function automatically adjusts pressure measurement integration time depending on the rate of change of pressure. When pressure is changing rapidly, reading rate is increased. When pressure is evolving slowly, reading rate is decreased and maximum precision is obtained.

When the automated read rate function is ON, three pressure rate of change dependent read rates are used. The result is three display update rates:

Table 16. READRT - display update rates

PRESSURE

RATE OF CHANGE

> 3 % of range span/s > 0.5 and < 3 % of range span/s < 0.5 % of range span/s

For situations in which maximum reading precision is desired regardless of pressure rate of change, the RPM4 automated read rate function can be turned

DISPLAY

UPDATE

≈ 0.2 s ≈ 0.6 s ≈ 1.2 s

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

OFF. In this case, the reading rate is always the high resolution rate of about 1.2 seconds per reading.

 OPERATION

To turn the automated read rate function ON or OFF or check its current status, press [SPECIAL], <7internal>, <3ReadRt>.

The display is:

The cursor is on the current selection. Selecting <1on> activates the automated reading rate and returns to the MAIN

RUN screen. Selecting <2off> turns OFF the automated reading rate and returns to the MAIN RUN screen.

Auto read rate: 1on 2off

Auto read rate ON/OFF is Q-RPT specific. Turning auto read rate ON or OFF

applies to all RPM4 measurements.

3.5.7.3 <3RPT2X>

The default RPM4-AD condition is auto read rate ON.

 PURPOSE

To enable and disable the RPM4-AD parallel measurement mode in which two Q-RPT modules are used to measure in parallel and their readings are averaged.

The ability to turn ON and OFF parallel measurement mode is not used in RPM4-AD. Parallel measurement mode is always enabled in RPM4-AD A160K/A160K (rotary wing) (see Section 3.2.5). It is not available in RPM4 A350K/A160K (fixed wing).

3.5.7.4 <4LO VNT>

This function is not used in RPM4-AD models.

3.5.7.5 <5LOG>

 PURPOSE

To view and/or clear the RPM4-AD event log.

 PRINCIPLE

RPM4-AD records to a log each time one of the following events occurs:

• Pmax! of an internal RPM4-AD Q-RPT or utility sensor is exceeded (see Section 3.4.4.1).

• A memory fault occurs.

 OPERATION

To view the event log press [SPECIAL], <9Log>. Use [

] and [ ] to move back and forth between older and newer log entries.

Each log entry has two screens, one with the event description and one with the even time and date. Use [

] and [ ] to toggle between the two screens. The

oldest logged event appears.

3. OPERATION

After the last log has been viewed, the option to clear the log, <1no>, <2yes> is presented. Use <2yes> to remove all entries from the log. Use <1no> to continue without altering the log.

To leave the log, use [ESC].

3.5.8 <8CAL>

 PURPOSE

To calibrate the RPM4-AD Hi and Lo Q-RPTs and adjust the on-board barometer. These functions are considered part of RPM4-AD maintenance and are covered in the maintenance section of this manual (see Sections 5.2, 5.3).

3.5.9 <9RESET>

 PURPOSE

To reset various RPM4-AD settings to default or factory values.

 PRINCIPLE

RPM4-AD stores its user definable settings in non-volatile memory. The reset menu allows the user to selectively or completely reset these settings to factory defaults. This clears any settings that the user has made, and should be used only to restore the RPM4-AD to a known state. RPM4-AD goes through its power up sequence after any type of reset is executed.

RPM4-AD reset functions will change current settings to factory defaults. These may include

settings vital to RPM4-AD operation and affecting the calibration of the quartz reference pressure transducers (Q-RPTs). Reset functions should only be used by qualified personnel with knowledge of reset consequences. Reset functions should never be used “experimentally”.

 OPERATION

To access the RESET menu, press [SPECIAL], <9reset>. The display is:

1sets 2units 3ATest

4cal 5all

RESET menu choices include:

<1set> to reset general system operating parameters (see Section 3.5.9.1).

<2units>

<3ATest>

to reset unit of measure functions (see Section 3.5.9.2).

not used in RPM4-AD models.

<4cal> to reset internal calibration coefficients and modes (see Section 3.5.9.4).

5all> to reset all settings except ID and security password to factory default values

(see Section 3.5.9.5).

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

3.5.9.1 <1SETS>

 PURPOSE

Sets most general operating parameters back to default values. Does not affect calibration coefficients or remote interfaces. The Reset – Sets resets are itemized in Table 17.

RESET RESULT SEE SECTION

Active Q-RPT Hi 3.2.1, 3.3.1

[UNIT]

[MODE]

[RANGE]

[HEAD]

Stability Limit 3 Pa for A160K Q-RPT, 6 Pa for A350K Q-RPT 3.4.3

Upper Limit 102% of Hi Q-RPT range 3.4.4

Resolution 0.001 % FS of Hi Q-RPT default range 3.4.2

AutoZ AutoZ ON for all Q-RPTs and measurement modes.

AutoZ

Leak Check 15 second run time. Clear logged results 3.3.5

Screen Saver 10 minutes to activation 3.5.5.1

Key Sounds Medium tone valid key press sound 3.5.5.2

Lo Vnt Not used in RPM4-AD models. 3.5.7.4

Display RPT display 3.3.6.4

ReadRate Automatic 3.5.7.2

Pressure unit of measure to kts for Hd Q-RPT and ft for Lo QRPT

Measurement mode to absolute + differential.. 3.3.3

Hi Q-RPT in absolute + differential mode (Hd) 3.3.1

0 cm height and Nitrogen medium 3.3

value not affected

offset

set to 101.325 kPa a

atm,0

Table 17. Reset – Sets

3.3.2

3.5.1

3.5.1, 3.2.2

3.5.9.2 <2 UNITS>

 PURPOSE

Sets the six pressure units available under the UNIT function for various measurement modes to the default selections (see Section 3.3.2, 3.5.6).

Sets the user defined unit to 1.000/Pa (see Section 3.5.6).

Sets the reference temperature for inWa unit to 20°C.

Sets the reference temperature for true airspeed units to 15°C.

3.5.9.3 <3ATEST>

This function is not used in RPM4-AD models.

3. OPERATION

3.5.9.4 <4 CAL>

The Reset - Cal function will reset Q-RPT, utility sensor and barometer

calibration coefficients and settings and reset AutoZ values to zero. This will change the RPM4-AD calibration and could cause it to make out of tolerance measurements.

 PURPOSE

Clears all user values affecting the calibration of Q-RPTs and the on-board barometer. The Reset – Cal resets are itemized in Table 18.

Table 18. Reset – Cal

RESET RESULT SEE SECTION

All Q-RPT Calibration Coefficients

On-board Barometer Calibration Coefficients

Calibration Date Set all dates to 19800101 5.2.7, 5.3

AutoZ values All P

AutoZ function ON, all Q-RPTs, all measurement modes 3.5.1

PA to zero, PM to 1 5.2.1.1, 5.2.7

PA to zero, PM to 1 5.3

values to zero for absolute mode and

offset

101325 Pa for gauge and negative gauge modes

3.5.1

3.5.9.5 <5 ALL>

 PURPOSE

The reset - all function clears and deletes large amounts of user defined

information including critical calibration data.

Combines all resets in one global reset command that clears the entire user section of non-volatile memory except the ID function (see Section 3.5.5.4) and the security level password (see Section 3.5.5.5) returning RPM4-AD to the “as delivered” condition. The Reset – All resets are itemized in Table 19.

Table 19. Reset – All

RESET RESULT SEE SECTION

Reset – Sets All the resets of Reset - Sets 3.5.9.1

Reset – Units All the resets of Reset - Units 3.5.9.2

Reset – Atest All the resets of Reset - ATest --

Reset – Cal All the resets of Reset – Cal 3.5.9.4

Remote Interfaces COM1, COM2 and IEEE-R88 interfaces to

default settings.

Remote Communications Remote command format to Classic 3.5.2.3

Level (Security) Reset security level to low 3.5.5.5

SDS All SDS full time ON 3.5.4.2

3.5.2

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

OOTTEES

4. REMOTE OPERATION

44..

EEMMOOTTEE

PPEERRAATTIIOON

4.1 OVERVIEW

Most of the RPM4-AD front panel functions can also be executed by commands from a remote computer. The host computer can communicate to the RPM4-AD using the RPM4’s COM1 RS232 port or it’s IEEE-488 port.

Before writing test code using RPM4-AD remote commands, familiarize yourself with its operating principles by reading Section 3 of this manual.

4.2 INTERFACING

Sending a program message to the RPM4-AD places it into remote mode. The remote indicator to the right of the display window lights when the RPM4-AD is in remote mode. It also flickers when a program message is received. The menus usually accessed from the front panel are locked out while in remote. The [ESC] key returns the RPM4-AD to local operation unless the <REMOTE> program message, which locks out all keypad operation, was sent to the unit.

4.2.1 RS232 INTERFACE

4.2.1.1 COM1

The RPM4-AD COM1 RS232 interface is located on the back of the unit. It is a 9-pin male DB-9F connector configured as a DCE device. Data is transmitted out of the unit using pin 2, and is received on pin 3. This allows a normal pin-topin DB-9M to DB-9F RS232 cable to be used to connect to a DTE host.

Handshaking is not required or supported. The COM1 receive buffer is 80 bytes deep. If you overflow the buffer by sending too much data, the data will be lost. Because of this, you must send a single program message at a time and you must wait for the RPM4-AD to reply from the previous command before issuing another command.

Table 20. COM1 Pin Designations and Connections

RPM4-AD COM1 DB-9F PIN DESIGNATIONS

PIN # FUNCTION DESCRIPTION

2 TxD This pin transmits serial data from the RPM4-AD to the host. 3 RxD This pin accepts serial data from the host computer. 5 Grn This pin is the common return for the TxD and RxD signals.

IBM PC/XT DB-9F

CONNECTIONS

DB-25M DB-9F DB-9M DB-9F

2 3 3 3 3 2 2 2 7 5 5 5

IBM PC/XT DB-9M TO RPM4-AD DB9F

CONNECTION

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

4.2.1.2 IEEE-488

The RPM4-AD IEEE-488 interface is located on the back of the unit. The physical and electrical interface conforms to IEEE Std 488.1-1987 Subset E2 and IEEE Std. 488.2-1992. You should not attempt to communicate with the IEEE488 interface while using the COM1 interface. The IEEE-488 receive buffer is 250 bytes deep. If you attempt to overflow the buffer, the RPM4-AD will hold off release of the NRFD handshake line until it can service and empty the receive buffer. This keeps the buffer from overflowing. It is recommended that you check for errors using the “ERR?” query after sending a group of non-query program messages. When using queries, ensure that you wait for a reply to each query to ensue proper operation and order of command execution. Replies to queries remain in the reply queue until the host gets them, so they can “stack up”, causing replies to appear out of sequence.

4.2.1.3 COM2

The RPM4-AD COM2 RS232 interface is located on the back of the unit. It can be used to allow the host computer to communicate with another device through the RPM4-AD. This allows the user to use one host COM port to communicate with the RPM4-AD and an additional RS232 device. Refer to the “#” remote program command for details.

COM2 is a 9-pin female DB-9F connector configured as a DTE device. Data is transmitted out of the RPM4-AD using pin 3, and is received on pin 2. This allows a normal pin-to-pin DB-9M to DB-9F RS232 cable to be used to connect to a DCE device.

Handshaking is not required or supported.

Table 21. COM2 DB-9F Pin Designations

PIN # FUNCTION DESCRIPTION

2 RxD This pin transmits serial data from the RPM4-AD to a device. 3 TxD This pin accepts serial data from the external device. 4 DTR This pin is Data Terminal Ready (DTR) (held at + 5 V). 5 Grn This pin is the common return for the TxD and RxD signals.

4.3 PROGRAMMING FORMATS

RPM4-AD supports two program message formats, the “classic”, and the “enhanced” formats. The user must select which format to use. Selection can be accomplished from the front panel (see Section

3.5.2.3) or remotely using the “L2” or “L3” program message (see Section 4.4.4). The ”MSGFMT” command can also be used to select the format, but is not recommended for new designs.

The main difference between the “classic” and “enhanced” formats is that when using the IEEE-488 interface, a query operator “?” using the COM1 port in classic or enhanced mode or using the IEEE-488 port in classic mode, every command has a reply which the host must wait for before continuing. In addition, the enhanced message format supports IEEE Std 488.2 syntax, format and status reporting. The default is the classic format.

must be included in an enhanced command to yield a reply from the RPM4-AD. When

In either format, it is recommended that you start out a command sequence with the “*CLS” command, which clears all of the communication and error queues. The basic commands are similar for both the classic and enhanced formats, but the usage, syntax, format and status reporting are different.

Many RPM4-AD classic and enhanced commands are common with RPM4 (non-AD), PPC2+, PPCK+ and PPC3 Pressure/Controller Calibrators.

4. REMOTE OPERATION

4.3.1 CLASSIC PROGRAM MESSAGE FORMAT

Each program message sent is also a query. You can only send one program message to the RPM4-AD at time. After sending any program message, you must wait for the RPM4-AD to reply before sending another program message. This reply will contain data, or a numeric error message if the program message was invalid. You must wait for this reply before issuing another program message to the RPM4-AD. This insures that the RPM4-AD has completed the program message. Most remote program messages will return a reply within 500 ms except:

“PR?”, “PRR?”, “SR?”, “ATM?”, “RATE?”: Up to 2 seconds.

“AUTOZERO=RUN”: Up to 10 seconds

“MODE=”, “UNIT=”, “RANGE=”: Up to 5 seconds

The syntax and format used for each program message in the classic mode is listed next to the keyword “Classic”’ in each program message summary in Section 4.4.4.

4.3.2 ENHANCED PROGRAM MESSAGE FORMAT

The enhanced program message format uses the IEEE Std. 488.2 format, syntax and status reporting. Errors are reported using the IEEE Std. 488.2 status reporting model. If an error is reported, the error is put into an Error Queue and the “ERR?” query program message can be used to get a text description of the most recent error. If you are using the IEEE-488 port, the service request line can be setup to be asserted if this occurs (see Section 4.5.2). In the enhanced format, there are two possible program message types for every program message. Each of these two types starts with the same basic text referred to as the program message header. The two types are COMMAND type and QUERY type commands.

4.3.2.1 USING COMMAND TYPE COMMANDS

Enhanced format commands DO NOT reply when using the IEEE-488

interface unless a “?” is included in the command. Do not expect a response from the RPM4’s IEEE-488 interface to non-query (no “?”) commands as there is none. Remote software will time-out waiting for a response from RPM4-AD. However, in RS232 communications, there is always a response and the response MUST be read prior to issuing another command.

The COMMAND type of program message executes a process and can additionally send data to the RPM4-AD in the form of comma delimited arguments. This data is usually a setting of some sort that is stored in the RPM4-AD. If data is specified, it must be preceded by at least one white space from the program message header and be within the range and format described in the program message description. The keyword “Command:” appears to the left of the required syntax in each program message description in Section 4.4.4.

you are using the IEEE-488 port, the Command type does not generate a reply

If unless you place a query operator “?” immediately after the command. You also may send multiple program messages at once by separating each program message with a semicolon. The commands are queued and executed in as received order after the entire message stream has been received, so care in determining order of execution is needed.

If you are using the RS232 port COM1, the Command type will always generate a reply so you must wait for a reply before issuing another program message. Because of this, you can only send one Command program message at a time while using the COM1 port.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

Examples:

• IEEE-488 enhanced mode command series using query operator:

“*CLS?” (Clear the error queue. Wait for reply) “MMODE? A” (Generates a reply. User must wait for reply before continuing) “UNIT? KPA” (Generates a reply. User must wait for reply before continuing) “PR?” (Generates a reply. User must wait for reply before continuing)

• IEEE-488 enhanced mode commands without query operator:

“*CLS” (Clear the error queue. No reply) “MMODE A” (No reply) “UNIT KPA” (No reply) “ERR?” (Wait for reply. User should use “ERR?” query following a

series of non query commands to check for errors that may have occurred)

• IEEE-488 enhanced mode multiple commands without query operator:

“*CLS” (Clear the error queue. No reply) “MMODE A; UNIT KPA” (Two command at once. No reply) “ERR?” (Wait for reply. User should use “ERR?”

query following a series of non query commands to check for errors that may have occurred)

• COM1 enhanced mode command:

“*CLS” or “*CLS?” (Clear the error queue. Wait for reply) “UNIT KPA” or “UNIT? KPA” (Generates a reply. User must wait for

reply before continuing)

“MMODE A” or “MMODE? A” (Generates a reply. User must wait for

reply before continuing)

“PR” or “PR?” (Generates a reply. User must wait for

reply before continuing)

4.3.2.2 USING QUERY TYPE COMMANDS

The QUERY type of program message just requests data from the RPM4-AD. Placing the query operator “?” immediately after the command creates a query. You must wait for a reply with a query. If you send any type of program message to the RPM4-AD after a query before receiving a reply, the program message is discarded and an error is generated. Errors are reported using the IEEE Std. 488.2 status reporting model. A Query program message always ends with a question mark. Most queries return a reply within 200 ms except:

“PR?”, “PRR?”, “SR?”, “ATM?”, “RATE?”: Up to 2 seconds.

“RPT”, “AUTOZERO RUN”: Up to 3 seconds

The syntax for using a QUERY program message is listed next to the keyword “Query:” in each program message summary in Section 4.4.4. Please note that queries result in a reply. You must check the error queue (use the “ERR” querie) to see if an error has occurred.

in enhanced mode via the IEEE-488 port that results in an error will not

4. REMOTE OPERATION

4.4 COMMANDS

4.4.1 PROGRAMMING MESSAGES

Some commands accept an optional suffix. This suffix can be used to specify the explicit Q-RPT to address (HI, LO or HL). Only the HI or HL RPT can be the “active” Q-RPT at any time. If the suffix is not specified, then the “Active” Q-RPT (“HI” or “HL”) is assumed. The “LO” QRPT cannot be made the “active” RPT, but you can access it’s measurement using a suffix of “2” in some commands. The “RANGE” command can be used to select the “Active” QRPT. There are some limitations to use of the suffix when the RPM4-AD is in differential mode (see Section 3.2.6) or the “HL” Q-RPT is active (see Section 3.2.5). See the program message descriptions for suffix use with a specific command.

Table 22. Program Message List

COMMAND

‘n’ indicates an

optional suffix

# ABORT ARANGEn ATM AUTOZEROn AUTOZEROn=RUN CALAMB COM1 COM2 CONTn DATE ERR GPIB HEAD ID L2 L3 LLn

LOCAL MEM MMODEn MSGFMT NVENTn PCALn PCAL:XX PRn PRRn QPRRn RANGE RATEn READRATEn READYCKn REMOTE RESn RESET RPTn SCRSAV SDSn SDSACT SDSAUTO SN SRn SSn SS%n TIME UCOEFn

Send a command string out of the RPM4-AD COM2 port. Stop pending operations Command not available in RPM4-AD models.

Read the current atmospheric pressure (on-board barometer). Read or set the status of the AutoZ automatic zeroing function. Run AutoZero. Read or set the on-board barometer calibration Read or set the configuration of the COM1 port. Read or set the configuration of the COM2 port. Enable continuous measurements Read or set the current date. Read the last error message. Read or set the GPIB interface address. Read or set the fluid head settings. Read or set the RPM4-AD alphanumeric asset ID tag. Selects “classic” program message format Selects “enhanced” program message format Read or set the lower limit for the current range (negative gauge and differential modes only). Return control to the RPM4-AD front panel. Read the power-up memory test status. Read or change the active measurement mode. Read or set the type of program message format to use. Command not available in RPM4-AD models. Read or set the user Lo Q-RPT calibration information. Read or set the user Lo Q-RPT calibration information (old command). Read the next RPM4-AD pressure. Read the next RPM4-AD pressure, rate, and ATM. Read the last RPM4-AD pressure, rate and ATM. Select a Q-RPT to be active Read the next available rate of change of pressure. Read or set the Q-RPT measurement read rate and mode Read or set a flag that is cleared by a Not Ready condition. Enable remote local lockout operation. Read or set the pressure display resolution. Reset the RPM4-AD to default user parameters. Read the available Q-RPT data. Read or set the front panel screen saver period. Read or set the SDS state for a specific Q-RPT Read or set the active Q-RPT SDS state Read or set the SDS mode for both Q-RPTs Read the serial number of the RPM4-AD. Read the next available pressure status (Ready/Not Ready). Read or set the stability required for a Ready condition. Read or set the stability required for a Ready condition (% span/ s). Read or set the current time of day. Convert a pressure in Pascal to pressure in the current units.

DESCRIPTION

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL

COMMAND

‘n’ indicates an

optional suffix

UDU ULn UNITn VER ZOFFSETn ZOFFSET:XX

Read or set the user defined pressure unit. Read or set the upper limit for the current range. Read or set the pressure unit of measure for the current range. Read the RPM4-AD software version. Read or set the AutoZero Z Read or set the AutoZ Z

4.4.2 ERROR MESSAGESS

Table 23. Error #s and Descriptions

REPLY DESCRIPTION

ERR# 0 “OK” ERR# 2 “Text argument is too long” ERR# 3 “Arguments cannot be 0” ERR# 4 “External device not detected” ERR# 5 Not used ERR# 6 “Numeric argument missing or out of range” ERR# 7 “Missing or improper command argument(s)” ERR# 8 “External device time-out error”

ERR# 9 “Unknown command” ERR# 10 “Missing or invalid command suffix” ERR# 11 “Command missing argument” ERR# 12 “System overpressured” or “overpressure may result” ERR# 13 “Text queue overflow” ERR# 14 “User unit not defined” ERR# 17 Not used ERR# 18 “Command not yet available” ERR# 19 “Not available with absolute units” ERR# 20 “Not available with gauge device” ERR# 21 Not used ERR# 22 “Pressure is not stable” ERR# 23 “Option not available or installed” ERR# 25 Not used ERR# 26 “COM port failed to initialize” ERR# 27 “Internal device failure” ERR# 28 “Device failure” ERR# 29 “Device not available” ERR# 30 “Must be on range HI” ERR# 31 “Exceeds upper or lower limit” ERR# 32 “Not stable enough” ERR# 37 “Data table is full” ERR# 38 “Selected range is not available” ERR# 39 “Data verify error” ERR# 45 “Argument not allowed” ERR #46 “Argument cannot be negative” ERR #52 “Command obsolete” ERR# 53 “Not Available” ERR# 60 “Air data unit of measure not compatible with measurement

mode” (e.g. airspeed in absolute mode, altitude in mode other than absolute)

DESCRIPTION

for the specified Q-RPT.

offset

for the specified Q-RPT (old command).

offset

4. REMOTE OPERATION

4.4.3 PROGRAM MESSAGE DESCRIPTION OVERVIEW

Purpose A brief description of the programs message’s function. Command This is the Enhanced program message syntax to send data to the RPM4-AD or to

Query This is the Enhanced program message syntax to request data from the RPM4-AD. The

Classic This is the Classic program message syntax to send data to the RPM4, to execute an

Suffix Some commands support an optional suffix. This suffix is typically used to specify a Q-RPT to

Arguments If the program message can be used to set data inside the RPM4, then this section describes

Default If the program message can be used to set data inside the RPM4, then this line shows

Remarks This field has the details and remarks about the command. Example Examples are given for the enhanced and classic methods.

Errors If the program message can report an argument error, the types of errors are listed.

4.4.4 PROGRAM MESSAGE DESCRIPTIONS

Purpose To allow the host PC to communicate with a device connected to the RPM4-AD COM2

Classic “#xx” Arguments xx: The string to send out of the RPM4-AD COM2 port. It must be less than

Remarks The RPM4-AD COM2 port can be used to communicate to another RS232 device (such

Example (classic) This example assumes that a second RPM4’s COM1 port is connected to the RPM4-AD

Fluke RPM4-AD User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

ABOUT THIS MANUAL

1. INTRODUCTION

1.1 PRODUCT OVERVIEW

1.2 SPECIFICATIONS

1.2.1 GENERAL SPECIFICATIONS

1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS

1.2.2.2 ON-BOARD BAROMETER

1.2.3 BATTERY AND CHARGER PACK

2. INSTALLATION

2.1 UNPACKING AND INSPECTION

2.1.1 REMOVING FROM PACKAGING

2.1.2 INSPECTING CONTENTS

2.2 SITE REQUIREMENTS

2.3 SETUP

2.3.1 PREPARING FOR OPERATION

2.3.2 FRONT AND REAR PANELS

2.3.2.1 FRONT PANEL

2.3.2.2 REAR PANEL

2.3.3 POWER CONNECTION

2.3.3.1 85 TO 264 VAC, 50/60 HZ VAC POWER

2.3.3.2 BATTERY PACK

2.3.4 REMOTE [ENT] CONNECTION (FOOTSWITCH OR OTHER SWITCH)

2.3.5 CONNECTING TO MEASURE PRESSURE (PS AND PT PORTS)

2.3.6 THE VENT AND ATM PORTS

2.3.7 CHECK/SET SECURITY LEVEL

2.3.8 SDS FULL TIME OFF

2.4 POWER-UP AND VERIFICATION

2.4.1 SWITCH POWER ON

2.4.2 CHECK PRESSURE MEASUREMENT OPERATION

2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT

2.4.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT

2.5 SHORT TERM STORAGE

3. OPERATION

3.1 USER INTERFACE

3.1.1 MAIN RUN SCREEN

3.1.2 FUNCTION / DATA KEYPAD LAYOUT AND PROTOCOL

3.1.3 REMOTE [ENT] (ENTER) FOOTSWITCH

3.1.4 SOUNDS

3.2 GENERAL OPERATING PRINCIPLES

3.2.1 Q-RPTS AND Q-RPT SELECTION

3.2.2 GAUGE AND NEGATIVE GAUGE MEASUREMENT, DYNAMIC COMPENSATION FOR ATMOSPHERIC PRESSURE

3.2.3 ALTITUDE AND AIRSPEED MEASUREMENT

3.2.3.1 RPM4-AD A160K/A160K (ROTARY WING)

3.2.3.2 RPM4-AD A350K/A160K (FIXED WING)

3.2.4 PRESSURE READY/NOT READY

3.2.5 PARALLEL MEASUREMENT MODE (//MTM) (RPM4-AD A160K/A160K ONLY)

3.2.6 DIFFERENTIAL MEASUREMENT MODE

3.2.7 AUTOZERO FUNCTION

3.2.8 SDS SELF DEFENSE SYSTEM

3.2.9 USE OF THE 12VDC BATTERY/CHARGER PACK

3.2.10 USING RPM4-AD WITH A PPC3 CONTROLLER/CALIBRATOR

3.2.11 DIRECT FUNCTION KEYS SUMMARY

3.3 DIRECT FUNCTION KEYS

3.3.1 [RANGE]

3.3.1.1 RPM4-AD A160K/A160K (ROTARY WING)

3.3.1.2 RPM4-AD A350K/A160K (FIXED WING)

3.3.2 [UNIT]

3.3.3 [MODE]

3.3.3.1 DIFFERENTIAL MEASUREMENT MODE OPERATION

3.3.4 [AUTORANGE]

3.3.5 [LEAK CK]/RATE OF CHANGE MEASUREMENT

3.3.6 [DISPLAY]

3.3.6.1 AVG (AVERAGE)

3.3.6.2 Rate

3.3.6.3 Dev (Deviation)

3.3.6.4 RPT

3.3.6.5 Hi/Lo

3.3.6.6 Freeze

3.3.6.7 Clean

3.3.7 [HEAD]

3.3.8 [SDS] (SELF DEFENSE SYSTEM)

3.3.8.1 SDS IN DIFFERENTIAL MEASUREMENT MODE

3.3.8.2 SDS IN PARALLEL MEASUREMENT MODE, RPM4-AD A160K/A160K ONLY

3.3.9 [AUTOZ]

3.3.9.1 [AUTOZ] IN GAUGE AND NEGATIVE GAUGE MODE