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.

+ 100 hidden pages