Fluke A20M-AF, A70M, HPMS User Manual

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RPM4/HPMS A70M/A20M-AF™

Reference Pressure Monitor with

High Pressure Mounting System

Operation and Maintenance Manual

NSN 6685-01-529-6990 RN

(2 of 3)

RPM4/HPMS A70M/A20M-AF 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.

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, GPC1-1000, PGC-1000-AF, RPM4, QDUT, Q-RPT, RPM4 and SDS are trademarks, registered and otherwise, of DH Instruments, a Fluke Company.

Document No. 550136b-01 070627 Printed in the USA

AABBLLEE

OONNTTEENNTTS

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

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

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

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

1. INTRODUCTION ................................................................. 1

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

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

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

1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS .......................................................................................3

1.2.2.1 QUARTZ REFERENCE PRESSURE TRANSDUCERS (Q-RPT)..............................................................3

1.2.2.2 ON-BOARD BAROMETER ........................................................................................................................3

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

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

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

2.1.2 INSPECTING CONTENTS.............................................................................................................................6

2.2 PGC-10000-AF SYSTEM.........................................................................................................................6

2.3 SITE REQUIREMENTS............................................................................................................................7

2.4 SETUP .....................................................................................................................................................8

2.4.1 PREPARING FOR OPERATION...................................................................................................................8

2.4.2 RPM4/HPMS FRONT, REAR AND SIDE VIEWS..........................................................................................8

2.4.2.1 RPM4/HPMS FRONT VIEW ......................................................................................................................8

2.4.2.2 RPM4/HPMS REAR VIEW.........................................................................................................................9

2.4.2.3 RPM4/HPMS SIDE VIEW ........................................................................................................................10

2.4.3 RPM4 FRONT AND REAR PANELS ..........................................................................................................10

2.4.3.1 RPM4 FRONT PANEL .............................................................................................................................10

2.4.3.2 RPM4 REAR PANEL................................................................................................................................11

2.4.4 POWER CONNECTION...............................................................................................................................11

2.4.5 FOOTSWITCH CONNECTION....................................................................................................................11

2.4.6 TEST PORT CONNECTION........................................................................................................................11

2.4.6.1 THE ATM PORTS OF RPM4 ...................................................................................................................12

2.4.7 CHECK/SET SECURITY LEVEL.................................................................................................................12

2.4.8 SETTING UP AUTOTEST FILES ................................................................................................................12

2.5 POWER-UP AND VERIFICATION.........................................................................................................13

2.5.1 SWITCH POWER ON ..................................................................................................................................13

2.5.2 CHECK PRESSURE MEASUREMENT OPERATION ................................................................................13

2.5.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT.............................................................13

2.5.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT...................................................................13

2.6 SHORT TERM STORAGE.....................................................................................................................14

2.7 LONG TERM STORAGE AND/OR PREPARATION FOR SHIPPING ..................................................14

3. OPERATION..................................................................... 15

3.1 USER INTERFACE................................................................................................................................15

3.1.1 MAIN RUN SCREEN....................................................................................................................................15

3.1.2 FUNCTION / DATA KEYPAD LAYOUT AND PROTOCOL........................................................................17

3.1.3 REMOTE [ENT] (ENTER) FOOTSWITCH...................................................................................................18

3.1.4 SOUNDS......................................................................................................................................................18

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

3.2 GENERAL OPERATING PRINCIPLES.................................................................................................18

3.2.1 PRESSURE READY/NOT READY..............................................................................................................18

3.2.2 GAUGE MODE, DYNAMIC COMPENSATION FOR ATMOSPHERIC PRESSURE ..................................19

3.2.3 MULTIPE RANGES (Q-RPTS, AUTORANGE AND INFINITE RANGING) ................................................19

3.2.4 AUTOMATED TEST AND CALIBRATION SEQUENCES ..........................................................................20

3.2.5 HPMS (HIGH PRESSURE MOUNTING SYSTEM) .....................................................................................20

3.2.6 DIRECT FUNCTION KEYS SUMMARY......................................................................................................24

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

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

3.3.2 [UNIT]...........................................................................................................................................................26

3.3.3 [MODE] ........................................................................................................................................................27

3.3.4 [AUTORANGE]............................................................................................................................................27

3.3.5 [LEAK CK]...................................................................................................................................................29

3.3.6 [DISPLAY]....................................................................................................................................................31

3.3.6.1 AVG (AVERAGE).....................................................................................................................................32

3.3.6.2 RATE........................................................................................................................................................33

3.3.6.3 DEV (DEVIATION) ...................................................................................................................................34

3.3.6.4 RPT ..........................................................................................................................................................35

3.3.6.5 HI/LO........................................................................................................................................................36

3.3.6.6 FREEZE ...................................................................................................................................................37

3.3.6.7 CLEAN .....................................................................................................................................................37

3.3.7 [HEAD].........................................................................................................................................................38

3.3.8 [SDS]............................................................................................................................................................39

3.3.9 [AUTOZ].......................................................................................................................................................39

3.3.9.1 [AUTOZ] IN GAUGE MODE.....................................................................................................................39

3.3.9.2 [AUTOZ] IN ABSOLUTE MODE...............................................................................................................40

3.3.10 [ENT] (RUN AUTOTEST)............................................................................................................................43

3.3.10.1 AUTOTEST INITIALIZATION...................................................................................................................44

3.3.10.2 TEST EXECUTION ..................................................................................................................................45

3.4 [SETUP].................................................................................................................................................47

3.4.1 <1RANGE> ..................................................................................................................................................47

3.4.1.1 SAVING AN AUTORANGE RANGE ........................................................................................................47

3.4.1.2 DELETING AUTORANGE RANGES .......................................................................................................48

3.4.2 <2RES> (RESOLUTION).............................................................................................................................48

3.4.3 <3STAB>......................................................................................................................................................49

3.4.4 <4UL> (UPPER LIMIT) ................................................................................................................................50

3.4.4.1 OVER PRESSURE FUNCTION...............................................................................................................50

3.4.5 <5ATEST>....................................................................................................................................................51

3.4.5.1 DATA........................................................................................................................................................51

3.4.5.2 FILE..........................................................................................................................................................52

3.5 [SPECIAL] .............................................................................................................................................54

3.5.1 <1AUTOZ>...................................................................................................................................................55

3.5.1.1 EDIT AUTOZ............................................................................................................................................58

3.5.2 <2REMOTE>................................................................................................................................................58

3.5.2.1 <1COM1, 2COM2> ..................................................................................................................................59

3.5.2.2 <3IEEE-488>............................................................................................................................................59

3.5.2.3 <4FORMAT>............................................................................................................................................59

3.5.2.4 <5RS232 SELF-TEST>............................................................................................................................59

3.5.3 <3HEAD>.....................................................................................................................................................60

3.5.4 <4SDS>........................................................................................................................................................60

3.5.5 <5PREFS> ...................................................................................................................................................60

3.5.5.1 <1SCRSVR> ............................................................................................................................................61

3.5.5.2 <2SOUND> ..............................................................................................................................................61

3.5.5.3 <3TIME>...................................................................................................................................................62

3.5.5.4 <4ID>........................................................................................................................................................62

3.5.5.5 <5LEVEL> (SECURITY) ..........................................................................................................................63

3.5.6 <6PUNIT>.....................................................................................................................................................65

3.5.7 <7INTERNAL>.............................................................................................................................................66

3.5.7.1 <1BARO>.................................................................................................................................................67

3.5.7.2 <2READRT> ............................................................................................................................................67

3.5.7.3 <3RPT2X>................................................................................................................................................68

3.5.7.4 <4LO VNT> ..............................................................................................................................................68

3.5.7.5 <5LOG>....................................................................................................................................................68

3.5.8 <8CAL>........................................................................................................................................................69

3.5.9 <9RESET> ...................................................................................................................................................69

3.5.9.1 <1SETS>..................................................................................................................................................69

3.5.9.2 <2 UNITS> ...............................................................................................................................................70

3.5.9.3 <3ATEST>................................................................................................................................................70

3.5.9.4 <4 CAL> ...................................................................................................................................................71

3.5.9.5 <5 ALL>....................................................................................................................................................71

TABLE OF CONTENTS

4. REMOTE OPERATION ....................................................... 73

4.1 OVERVIEW............................................................................................................................................73

4.2 INTERFACING.......................................................................................................................................73

4.2.1 RS232 INTERFACE.....................................................................................................................................73

4.2.1.1 COM1.......................................................................................................................................................73

4.2.1.2 IEEE-488..................................................................................................................................................74

4.2.1.3 COM2.......................................................................................................................................................74

4.3 PROGRAMMING FORMATS.................................................................................................................74

4.3.1 CLASSIC PROGRAM MESSAGE FORMAT ..............................................................................................75

4.3.2 ENHANCED PROGRAM MESSAGE FORMAT..........................................................................................75

4.3.2.1 USING COMMAND TYPE COMMANDS .................................................................................................75

4.3.2.2 USI NG Q U E R Y T Y P E C O M M A N D S...................................................................................................76

4.4 COMMANDS..........................................................................................................................................77

4.4.1 PROGRAMMING MESSAGES....................................................................................................................77

4.4.2 ERROR MESSAGESS.................................................................................................................................78

4.4.3 PROGRAM MESSAGE DESCRIPTION OVERVIEW..................................................................................79

4.4.4 PROGRAM MESSAGE DESCRIPTIONS....................................................................................................80

4.5 STATUS REPORTING SYSTEM...........................................................................................................97

4.5.1 ERROR QUEUE...........................................................................................................................................97

4.5.2 STATUS BYTE REGISTER.........................................................................................................................98

4.5.3 STANDARD EVENT REGISTER.................................................................................................................99

4.5.4 READY STATUS REGISTER....................................................................................................................100

4.6 IEEE STD. 488.2 COMMON AND STATUS PROGRAM MESSAGES ...............................................101

4.6.1 PROGRAM MESSAGE DESCRIPTIONS..................................................................................................101

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION ..............105

5.1 OVERVIEW..........................................................................................................................................105

5.2 RPM4 MAINTENANCE........................................................................................................................105

5.2.1 AUTOZERO OF Q-RPTS ...........................................................................................................................105

5.2.1.1 GAUGE MODE AUTOZERO..................................................................................................................105

5.2.1.2 ABSOLUTE MODE AUTOZERO ...........................................................................................................106

5.2.2 ADJUSTMENT OF THE ON-BOARD BAROMETER................................................................................106

5.3 RPM4 Q-RPT CALIBRATION..............................................................................................................107

5.3.1 PRINCIPLE ................................................................................................................................................107

5.3.1.1 PA AND PM COEFFICIENTS ................................................................................................................107

5.3.1.2 AS RECEIVED AND AS LEFT DATA ....................................................................................................108

5.3.2 EQUIPMENT REQUIRED..........................................................................................................................108

5.3.3 SET-UP AND PREPARATION ..................................................................................................................109

5.3.4 RECOMMENDED CALIBRATION POINT SEQUENCE ...........................................................................110

5.3.5 TURNING OFF ABSOLUTE MODE CAPABILITY FOR A Q-RPT ...........................................................110

5.3.6 Q-RPT CALIBRATION USING CALTOOL FOR Q-RPTS SOFTWARE...................................................111

5.3.7 EDITING AND VIEWING Q-RPT CALIBRATION INFORMATION...........................................................111

5.3.8 Q-RPT ADJUSTMENT WITHOUT CALTOOL FOR Q-RPTS SOFTWARE..............................................112

5.4 RPM4 REPAIR.....................................................................................................................................114

5.4.1 REMOVING RPM4 FROM HPMS..............................................................................................................114

5.4.2 OPENING AND CLOSING THE RPM4 ENCLOSURE..............................................................................115

5.4.3 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY...........................................................115

5.4.4 SUBASSEMBLY DESCRIPTION AND LOCATION..................................................................................116

5.4.4.1 MICRO BOARD......................................................................................................................................116

5.4.4.2 POWER SUPPLY MODULE ..................................................................................................................117

5.4.4.3 DRIVER BOARD....................................................................................................................................117

5.4.4.4 ON-BOARD BAROMETER ....................................................................................................................117

5.4.4.5 Q-RPT MODULE....................................................................................................................................117

5.4.4.6 DISPLAY ................................................................................................................................................117

5.4.4.7 COOLING FAN.......................................................................................................................................118

5.4.5 Q-RPT MODULE PNEUMATIC SCHEMATIC...........................................................................................118

5.5 RPM4 ILLUSTRATED PARTS BREAKDOWN ...................................................................................118

5.6 HPMS MAINTENANCE........................................................................................................................124

5.6.1 HPMS OVERHAUL....................................................................................................................................124

5.7 HPMS ILLUSTRATED PARTS BREAKDOWN...................................................................................125

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

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

7. APPENDIX......................................................................133

7.1 UNIT CONVERSION............................................................................................................................133

7.1.1 PRESSURE................................................................................................................................................133

8. WARRANTY ....................................................................135

8.1 OVERVIEW..........................................................................................................................................135

9. GLOSSARY .....................................................................137

TABLES & FIGURES

AABBLLEES

Table 1. RPM4/HPMS A70M/A20M-AF Parts List.......................................................................................6

Table 2. Settings and what they are specific to (range, measurement mode, Q-RPT, system)................20

Table 3. Summary of RPM4 function key operation..................................................................................24

Table 4. Settings made by AutoRange......................................................................................................28

Table 5. AutoZ ON and OFF......................................................................................................................56

Table 6. Security levels.............................................................................................................................. 64

Table 7. UNIT function - available units of measure..................................................................................66

Table 8. READRT - display update rates...................................................................................................68

Table 9. Reset – Sets.................................................................................................................................70

Table 10. Reset – Cal ................................................................................................................................71

Table 11. Reset – All..................................................................................................................................71

Table 12. COM1 pin designations and connections..................................................................................73

Table 13. COM2 DB-9F pin designations..................................................................................................74

Table 14. Program message list ................................................................................................................77

Table 15. Error #s and descriptions...........................................................................................................78

Table 16. 8 Bit status byte register ............................................................................................................98

Table 17. 8 bit standard event register ......................................................................................................99

Table 18. 8 bit ready status register.........................................................................................................100

Table 19. Program message list ..............................................................................................................101

Table 20. Calibration point sequence for A20M and A70M Q-RPTs.......................................................110

Table 21. RPM4 Front Panel Illustrated Parts Breakdown (see Figure 15)............................................118

Table 22. RPM4 Rear Panel Illustrated Parts Breakdown (see Figure 16) ............................................119

Table 23. RPM4 Illustrated Parts Breakdown of Display Assembly (see Figure 17).............................120

Table 24. RPM4 Illustrated Parts Breakdown of Internal Assembly (see Figure 18) ............................121

Table 25. RPM4 Illustrated Parts Breakdown of Internal Assembly (see Figure 19) ............................122

Table 26. RPM4 Illustrated Parts Breakdown of Electronic Chassis (see Figure 20) ...........................123

Table 27. HPMS Assembly Illustrated Parts Breakdown (see Figure 21 and 22)..................................125

Table 28. Troubleshooting guide .............................................................................................................129

Table 29. Pressure unit of measure conversion coefficients ...................................................................133

Table 30. DHI Authorized Service Providers ...........................................................................................135

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

IIGGUURREES

Figure 1. Typical PGC-10000-AF installation layout....................................................................................7

Figure 2. RPM4/HPMS front view................................................................................................................8

Figure 3. RPM4/HPMS rear view.................................................................................................................9

Figure 4. RPM4/HPMS side view...............................................................................................................10

Figure 5. RPM4 front panel........................................................................................................................10

Figure 6. RPM4 rear panel......................................................................................................................... 11

Figure 7. MAIN RUN screen display fields.................................................................................................16

Figure 8. Keypad layout.............................................................................................................................17

Figure 9. RPM4/HPMS front view..............................................................................................................22

Figure 10. HPMS pneumatic schematic.....................................................................................................23

Figure 11. Status register schematic .........................................................................................................98

Figure 12. RPM4/HPMS disassembly view .............................................................................................115

Figure 13. RPM4 internal view.................................................................................................................116

Figure 14. Pneumatic schematic of RPM4 Q-RPT Module ......................................................................118

Figure 15. RPM4 Illustrated Parts Breakdown of Front Panel..................................................................118

Figure 16. RPM4 Illustrated Parts Breakdown of Rear Panel...................................................................119

Figure 17. RPM4 Illustrated Parts Breakdown of Display Assembly........................................................120

Figure 18. RPM4 Illustrated Parts Breakdown of Internal Assembly........................................................121

Figure 19. RPM4 Illustrated Parts Breakdown of Internal Assembly........................................................122

Figure 20. RPM4 Illustrated Parts Breakdown of Electronic Chassis.......................................................123

Figure 21. HPMS Schematic.....................................................................................................................126

Figure 22. RPM4/HPMS-AF Assembly.....................................................................................................127

ABOUT THIS MANUAL

BBOOUUTT

This manual is intended to provide the user with the basic information necessary to operate an RPM4/HPMS A70M/A20M reference pressure monitor with high pressure mounting system. It also includes a great deal of additional information provided to allow you to optimize the use of the instrument and take full advantage of its many features and functions.

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 users. Section 3 is most important for those using the local front panel interface but should be read over by all users to familiarize themselves with general RPM4 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 behavior based on the symptom of that behavior. Certain words and expressions have specific meaning as they pertain to RPM4. 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/HPMS 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 new instrument. THEN… when you have questions or start to wonder about all the great features you might be missing, get into the manual!

HHIISS

AANNUUAAL

RPM4/HPMS A70M/A20M-AF is usually delivered as part of an PGC-10000-AF system which includes a PGC1-10000-AF pneumatic pressure controller and a GB-152-AF gas booster. The PGC1 and the GB-152 have their own Operation and Maintenance Manuals.

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 screen displays (e.g., <1yes>).

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

OOTTEES

1. INTRODUCTION

11.

NNTTRROODDUUCCTTIIOON

1.1 PRODUCT OVERVIEW

RPM4/HPMS A70M/A20M-AF is the combination of an RPM4 A70M/A20M-AF reference pressure monitor and an HPMS High Pressure Mounting System.

RPM4 A70M/A20M-AF is a stand-alone, microprocessor driven, reference pressure monitor intended to accurately measure gas pressure in a variety of pressure calibration, measurement and testing applications. It has been designed to provide very high performance and extensive features combined with maximum versatility, ease of use and durability. RPM4 A70M/A20M-AF covers the range from 0 to 10 000 psi gauge and atmosphere to 10 000 psi absolute using two high accuracy quartz reference pressure transducers (Q-RPTs) and an on-board barometer to measu re p ressure.

RPM4 A70M/A20M-AF is controlled locally by the operator using its front panel display, keypad and foot pedal or remotely by a computer using ASCII character command strings over its RS-232 and IEEE-488 interfaces.

RPM4 A70M/A20M-AF uses an AutoRange feature to automatically select the most appropriate Q-RPT and to optimize the RPM4 setup to cover the range.

The HPMS mounts the RPM4 at a convenient viewing angle and contains the hardware to isolate the RPM4’s low pressure Q-RPT (A20M (3 000 psi)) when the high pressure Q-RPT (A70M (10 000 psi) ) is in use.

RPM4/HPMS A70M/A20M-AF is typically delivered as part of a PGC-10000-AF Pneumatic Gauge Calibrator. The PGC-10000-AF system includes a GPC1-10000-AF pneumatic pressure controller and a GB-152-AF gas booster that have their own Operation and Maintenance Manuals.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

1.2 SPECIFICATIONS

1.2.1 GENERAL SPECIFICATIONS

Power Requirements: 85 to 264 VAC, 50/60 Hz, 25 VA max consumption

Operating Temperature Range: 18 to 28 °C

Storage Temperature Range: - 20 to 70 °C

Weight: 11 kg (22 lb) approx.

Dimensions: 23.5 cm H x 29.4 cm W x 37.5 cm D (9.3 in. x 11.6 in. x 14.8 in.)

Communication Ports

Pressure Range: 0 to 10 000 psi (70 MPa) in gauge mode

Operating Medium: Any clean, dry, non-corrosive gas

Pressure Connections: DH500 female

Pressure Limits: Maximum Working Pressure: 10 000 psi (70 MPa)

PGC-10000-AF SYSTEM

Fuses:

and 12VDC, 1.2 A

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

Atmosphere to 10 000 psi (70 MPa) in absolute mode

DH500 is a gland and collar type fitting for 6mm (1/4 in.) coned and left

hand threaded tubes equivalent to AE F250C, HIP HF4, etc.

Maximum Pressure Without Damage: 12 000 psi (83 MPa)

When low Q-RPT is connected to pressure:

Maximum Working Pressure: 3 000 psi (20 MPa) Maximum Pressure Without Damage: 3 600 psi (24 MPa)

Temperature: Operating:

Storage:

Relative Humidity: Operating: 15 to 70%RH (non-condensing)

Storage: 10 to 90%RH (non-condensing)

18 to 28 °C

-20 to 70 °C

1. INTRODUCTION

1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS

1.2.2.1 QUARTZ REFERENCE PRESSURE TRANSDUCERS (Q-RPT)

RPM4 A70M/A20M is configured with two quartz reference pressure transducers (Q-RPT) modules to measure pressure.

The Q-RPTs can measure absolute and 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).

Warm Up Time 30 minute temperature stabilization recommended from

Compensated Temperature Range 5 to 35 °C

Operating Temperature Range 8 to 28 °C

Maximum Range 3 000 psi (20 MPa)

Resolution

Precision

Predicted Stability

Measurement Uncertainty

1. Combined linearity, hysteresis, repeatability.

2. Predicted Q-RPT measurement stability limit (k=2) over one year assuming regular use of AutoZero function. As stabi lity

can only be predicted and varies from Q-RPT to Q-RPT, stability for a specific Q-RPT should be established from experience.

3. Maximum deviation of the Q-RPT indication from the true value of applied press ure including precision, predicted one year stability, temperature effect and calibration uncertainty (assumes calibr ation reference uncertainty of ±0.005% of reading), combined and expanded (k=2) following the ISO “Guide to the Expression of Uncertainty in Measurement.”.

cold power up.

A20M Q-RPT A70M-QRPT

10 000 psi (70 MPa)

user adjustable to 1 ppm of Q-RPT maximum or 10 ppm

of active AutoRange, whichever is larger,

± 0.0175 % of reading, or

0.13 psi, whichever is larger

± 0.02 % of reading, or

0.15 psi, whichever is larger

± 0.004 of reading

± 0.0175 % of reading, or

0.44 psi, whichever is larger

± 0.02 % of reading, or

0.5 psi whichever is larger

1.2.2.2 ON-BOARD BAROMETER

The measurement uncertainty of the on-board barometer is not significant to RPM4 Q-RPT measurement uncertainty. It is used only to measure small, short term changes in atmospheric pressure to provide dynamic compensation of the Q-RPT’s atmospheric pressure offset when in gauge pressure measurement mode (see Section 3.2.2)

Sensor Technology: Micro-machined silicon

Warm Up Time: None required

Resolution: 0.1 Pa (0.000015 psi)

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

OOTTEES

2. INSTALLATION

22.

NNSSTTAALLLLAATTIIOON

2.1 UNPACKING AND INSPECTION

RPM4/HPMS A70M/A20M-AF is usually delivered as part of an PGC-10000-AF system which includes a

GPC1-10000-AF gas pressure controller and a GB-152-AF gas booster.

2.1.1 REMOVING FROM PACKAGING

RPM4/HPMS A70M/A20M-AF is delivered, along with its accessories, in a reusable molded plastic, shipping container with polyurethane inserts to hold it in place.

Remove the RPM4/HPMS A70M/A20M-AF and its accessories from the shipping container and remove each element from its protective plastic bag.

Retain the shipping container for repacking the RPM4/HPMS A70M/A20M-AF when it is

shipped for recalibration or repair.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

2.1.2 INSPECTING CONTENTS

Check that all items are present and have no visible damage. If damage is noted, report it to your Receiving Department for appropriate action.

A new RPM4/HPMS A70M/A20M-AF includes all items listed in Table 1.

Table 1. RPM4/HPMS A70M/A20M-AF Parts List

DESCRIPTION PART NO.

RPM4/HPMS A70M/A20M-AF Reference Pressure Monitor/High Pressure Mounting System

ACCESSORIES:

1 ea. Transport case (with inserts) (used for original

shipment) 1 ea. Foot switch assembly 401613 1 ea. PGC-10000-AF Documentation Disk including:

• RPM4/HPMS A70M/A20M-AF Operation and

Maintenance Manual, p/n 550136

• GPC1-10000-AF Operation and Maintenance Manual, p/n 550135

• GB-152-AF Operation and Maintenance Manual, p/n 550137

1 ea. Calibration Report 550100 1 ea. Test Report (PGC-10000-AF) (if the RPM4/HPMS is

delivered as part of an PGC-10000-AF system) 1 ea. Power cord (7.5 ft) 100770 1 ea. General Accessories Disk (white CD) (Important :

Includes system support software and

documentation)

402192

124198

402189

550138

102987

2.2 PGC-10000-AF SYSTEM

RPM4/HPMS A70M/A20M-AF is usually delivered as the reference pressure measurement component of a PGC-10000-AF Pneumatic Gauge Calibrator. The PGC-10000-AF system includes:

• RPM4/HPMS A70M/A20M-AF: Reference pressure monitor and high pressure mounting system used as the pressure measuring reference of the calibration system.

• GPC1-10000-AF: Gas pressure controller used to set and adjust high pressure gas in the calibration system.

• GB-152-AF: Gas booster package used to supply gas pressure up to 10 000 psi (70 MPa) to the GPC1-10000-AF pressure controller.

2. INSTALLATION

Each of the three components of the PGC-10000-AF system has its own Operation and Maintenance Manual and individual setup and start up instructions. Figure 1 shows the typical setup configuration of a complete PGC-10000-AF system.

RPM4/HPMS A70M/A20M Reference Pressure Monitor

GPC1-10000-AF

CAUTION

GB152-AF

GB152-AF GB152 Setting

GB152 Setting

Drive Air Control Kit

GPC1-10000-AF Gas Pressure Controller

Gas Pressure Controller

GB152 Pressure Generation Component

GB152-AF Gas

GB152 Pressure Generation Component

GB152-AF Gas Booster

Booster

Remote ENTER Footswitch

Figure 1. Typical PGC-10000-AF installation layout

2.3 SITE REQUIREMENTS

The RPM4/HPMS A70M/A20M-AF is usually delivered as part of an PGC-10000-AF pneumatic gauge calibrator. The PGC-10000-AF also includes a GPC1-10000-AF and a GB-152-AF that each have their own Operation and Maintenance Manual. See the GPC1 and GB-152 Operation and Maintenance Manuals for information on their site requirements. Also see Section 2.2 for information on setup of a complete PGC-10000-AF system.

Install RPM4 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. Consider the placement of the FOOT SWITCH which may need to be accessed frequently while running calibrations.

Support facilities required for RPM4/HPMS A70M/A20M-AF include an electrical power source of 85 to 264 VAC, 47 to 440 Hz.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

2.4 SETUP

2.4.1 PREPARING FOR OPERATION

To prepare RPM4 for check out and operation:

Remove the plastic plug from the RPM4/HPMS rear panel TEST connection. Remove the protective plastic sheet from the front panel display. Familiarize yourself briefly with the RPM4 and HPMS front and rear panels (see Sections

2.4.2, 2.4.3).

2.4.2 RPM4/HPMS FRONT, REAR AND SIDE VIEWS

2.4.2.1 RPM4/HPMS FRONT VIEW

1. RPM4 A70M/A2 0M-AF Reference Pressure Monitor

2. Lo Q-RPT shut-off valve position LED

3. Lo Q-RPT shut-off valve

Figure 2. RPM4/HPMS front view

4. Lo Q-RPT active valve position LED

5. Lo Q-RPT active caution LED

2. INSTALLATION

2.4.2.2 RPM4/HPMS REAR VIEW

1. Foot switch (remote [ENT]) cable connector

Figure 3. RPM4/HPMS rear view

2. TEST port (DH500 F)

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

2.4.2.3 RPM4/HPMS SIDE VIEW

1. Lo Q-RPT shut off valve

2. RPM4/HPMS A70M/A20M Reference Pressure Monitor

3. Pressure relief valve (3 300 psi)

4. Foot switch (remote [ENT]) cable connector

5. TEST port (DH500 F)

Figure 4. RPM4/HPMS side view

2.4.3 RPM4 FRONT AND REAR PANELS

2.4.3.1 RPM4 FRONT PANEL

1. Ready/Not Ready indicator

2. Display

3. Remote activity indicator

Figure 5. RPM4 front panel

4. Cursor control keys

5. Multi-function keypad

2. INSTALLATION

2.4.3.2 RPM4 REAR PANEL

1. 12VDC Power Supply Connection

2. Accessories connector (to HPMS rear panel FOOTSWITCH and LEDs)

3. IEEE-488 Connector

4. COM2 Connector

5. COM1 Connector

6. Power Switch

7. Fuse

Figure 6. RPM4 rear panel

8. Electrical Power Connector (IEC-320-C13)

9. Fan

10. TEST(+) Pressure Port, Lo Q-RPT

11. TEST(+) Pressure Port, Hi Q-RPT

12. ATM Pressure Port, Lo Q-RPT

13. ATM Pressure Port, Hi Q-RPT

14. Product Label (bottom of case)

2.4.4 POWER CONNECTION

Connect the supplied power cable to the RPM4 rear panel power module. Connect the other end of the power cable to an electrical supply of 85 to 264 VAC,

50/60 Hz.

2.4.5 FOOTSWITCH CONNECTION

Connect the foot switch supplied in the RPM4/HPMS accessories to the HPMS rear panel electrical connection labeled FOOT SWITCH. Place the foot switch on the floor at a convenient location (see Section 2.2, Figure 1). The FOOT SWITCH function is equivalent to the RPM4 front panel [ENT] key and may be used frequently while running tests and calibrations.

2.4.6 TEST PORT CONNECTION

A single high pressure TEST port is provided on the rear panel of the HPMS. The test port connection is a DH500 F. DH500 is a gland and collar type fitting for 1/4 in.

(6 mm) coned and left hand threaded tube. DH500 is equivalent to AE F250C, HIP HF4, etc.

Connection to GPC1 if the RPM4/HPMS is Part of an PGC-10000-AF System

If the RPM4/HPMS was delivered as part of a PGC-10000-AF Pneumatic Gauge Calibrator, a GPC1 Gas Pressure Controller was delivered with it. The GPC1 includes a fittings kit with the necessary fittings to interconnect the RPM4/HPMS and GPC1 as well as instructions on making the connection. See the GPC1-10000-AF manual.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

USE THE CORRECT PRESSURE CONNECTORS: The RPM4/HPMS TEST port fitting is a DH500 F (see Section 1.2.1). It is NOT a 1/8 in. NPT F. Never use a fitting other than the corresponding male fitting in these connectors. Damage to the connectors and dangerous failure under pressure could result from using incorrect fittings.

DO NOT APPLY PRESSURE UNTIL YOU ARE FAMILIAR WITH OPERATION: The RPM4/HPMS rear panel test port connects internally to both the RPM4’s 3 000 psi (20 MPa) and 10 000 psi (70 MPa) Q-RPTs. The valve on the front of the HPMS isolates the low pressure Q-RPT when the high pressure Q-RPT is in use. Do not apply pressure to the RPM4/HPMS until you are familiar with its operation and know how to protect the low pressure Q-RPT from overpressure (see Section 3.2.5). FAILURE TO PROTECT THE LOW PRESSURE Q-RPT FROM OVERPRESSURE MAY DESTROY IT. DAMAGE DUE TO Q-RPT OVERPRESSURE IS NOT COVERED BY THE PRODUCT WARRANTY.

2.4.6.1 THE ATM PORTS OF RPM4

The ATM ports on the RPM4 Q-RPT modules are connected to the RPM4’s internal barometer to assure that the RPM4 gauge pressure measurements are relative to ambient pressure. These ports should always be left completely unobstructed and open to atmosphere.

NEVER plug, obstruct or connect a supply pressure to the RPM4 Q-RPT module ATM ports. This may adversely affect GAUGE mode operation and AutoZeroing functions.

2.4.7 CHECK/SET SECURITY LEVEL

RPM4 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 startup, determine the security level that is appropriate for the RPM4 and set a password if desired.

RPM4 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.

2.4.8 SETTING UP AUTOTEST FILES

RPM4 supports automated test/calibration sequences. AutoTest sequence parameters for testing specific DUTs can be stored in File AutoTest files and recalled to run a test. Consider setting up File AutoTest files for frequently tested DUTs as part of the RPM4 set up process (see Section 3.3.10, 3.4.5.2).

2. INSTALLATION

2.5 POWER-UP AND VERIFICATION

2.5.1 SWITCH POWER ON

Actuate the power switch on the RPM4 rear panel. Observe the front panel display as RPM4 initializes, error checks and goes to the MAIN RUN screen (see Section 3.1.1). If the RPM4 fails to reach the main run screen, service is required. Record the sequence of operations and displays observed and contact a DHI Authorized Service Provider (see Section 8, Table 23).

Check that one of the two green Valve Status LEDs on the front panel of the HPMS is lit (the red LED should NOT be ON). If neither of the green LEDs on the HPMS front panel lights, check that the 12 pin circular connector at the rear of the RPM4 itself is properly connected to the ACC. J1 connector.

2.5.2 CHECK PRESSURE MEASUREMENT OPERATION

2.5.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT

Let the RPM4 warm up with power ON for approximately 30 minutes. Press [MODE] on the RPM4 and select absolute. If desired, change the

pressure unit of measure using [UNIT] (see Section 3.3.2). Open the RPM4/HPMS TEST port to atmosphere. Put the valve knob in the

HPMS front panel into the Lo Q-RPT Active position. This opens the Lo and Hi Q-RPTs to the HPMS TEST port.

Use [RANGE] (see Section 3.3.1) to select the Lo Q-RPT. Observe the RPM4 indicated pressure. Check that the agreement of the RPM4 indicated value with a calibrated barometer in the same room is ± 0.15 psi. The calibrated barometer must have a measurement uncertainty of ± 0.25% of better.

Use [RANGE] to select the Hi Q-RPT Check that the agreement of the RPM4 indicated value with a calibrated barometer in the same room is ± 0.5 psi.

If a Q-RPT does not agree within tolerance, it may need to be AutoZeroed (see Section 3.3.9), calibrated (see Section 5.3) or repaired.

2.5.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT

Let the RPM4 warm up with power ON for at approximately 30 minutes. Open the RPM4/HPMS TEST port to atmosphere. Put the valve knob in the

HPMS front panel into the Lo Q-RPT Active position. This opens the Lo and Hi Q-RPTs to the HPMS TEST port.

Use [RANGE] (see Section 3.3.1) to select the Lo Q-RPT. Press [MODE] on the RPM4 and select gauge. If desired, change the pressure unit of measure using [UNIT] (see Section 3.3.3).

The value indicated should be near zero. 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.

Use [RANGE] to select the Hi Q-RPT and repeat the zeroing process.

If the display fails to zero properly for either Q-RPT, RPM4 may need repair.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

It is normal for RPM4 to indicate a value other than zero when vented when gauge mode is first entered or ranges are changed, especially if AutoZ is OFF, RPM4 has been OFF for some time or its location has changed.

2.6 SHORT TERM STORAGE

The following is recommended for short term storage of RPM4/HPMS:

• Vent the RPM4/HPMS TEST port.

• Switch the RPM4 power OFF.

2.7 LONG TERM STORAGE AND/OR PREPARATION FOR SHIPPING

The following is recommended for long term storage and or shipping of RPM4/HPMS:

• Plug the HPMS TEST port.

• Place the RPM4/HPMS in a plastic bag.

• Place the RPM4/HPMS in the custom shipping/storage case in which it was delivered.

3. OPERATION

33.

PPEERRAATTIIOON

3.1 USER INTERFACE

RPM4/HPMS is designed to offer the optimum balance between simple, straight forward operation and the availability of a wide variety of functions with a high level of operator discretion if desired.

The local operator interface is through the RPM4 front panel 2 x 20 character alpha-numeric display, a function/data keypad, a cursor control pad, an [ENTER] footswitch and a Ready/Not Ready indicator. Remote communications are also available via RS-232 or IEEE-488 interfaces (see Section 4).

The HPMS mounts the RPM4 at a convenient viewing angle and includes a valve and visual indicators to isolate and protect the RPM4’s 3 000 psi Q-RPT (A20M) when using the 10 000 psi Q-RPT (A70M) (see Section 3.2.5).

3.1.1 MAIN RUN SCREEN

The RPM4 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 st ructures.

The MAIN RUN screen is where RPM4 is left in normal operation. It displays the current measured pressure as well as a variety of additional information if desired.

Figure 7 and its legend summarize the RPM4 MAIN RUN screen fields and their function s.

RPM4 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/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

↑

PRESSURE1UNITM hzRR DDISPLAYFUCNIONnn/nn

DISPLAY FIELD NAME PURPOSE CONTENTS SECTION

1. PRESSURE1 Measured pressure

Displays pressure measured by the

Numerical pressure value and sign.

1.2.2.1,

3.3.1

active Q-RPT

2. UNIT Unit of measure

Identifies unit of measure in which

Pressure unit symbol 3.3.2

pressure values are displayed

3. M Measurement mode

Identifies measurement mode

<a> absolute <g> gauge

3.3.3

of displayed pressure

4. h Head pressure indicator

Indicates whether a fluid head correction is applied to

<h> the fluid head is not

zero

<blank> fluid head is zero

3.3.7

PRESSURE1

5. z AutoZero indicator

Indicates whether the AutoZero function

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

3.5.1,

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

6. RR Active Q-RPT position

Indicates the position of the active Q-RPT in the RPM4

<Hi> Internal Hi <Lo> Internal Lo

3.2.3

indicator

7. nn/nn Sequence progress indicator

8. DISPLAY

FUNCTION

Information specific to the DISPLAY mode

Indicates progress of an ATest sequence, during test execution

Pressure indication depending on current RPM4 DISPLAY function. Leading

<nn/nn> Number of this point

over total number of points in the sequence

Numerical pressure value

and sign.

3.3.10

3.3.6

character identifies the value

9. D Pressure information indicator

Pressure information indicator depending on current RPM4 DISPLAY function.

<σ> Display mode is

AVERAGE and value is standard deviation

<R> Display mode is RATE

3.3.6

and value is pressure rate of change per second

<H> Display mode is HI/LO and

value is high, then low

<D> Display mode is

DEVIATION and value is difference from current target

<),

,↓ > Display mode is Q-

RPT and value is measurement of inactive Q-RPT

<F> Display mode is FREEZE

and value is last captured reading

Blank, no character Current

display mode is CLEAN

Figure 7. MAIN RUN screen display fields

3. OPERATION

3.1.2 FUNCTION / DATA KEYPAD LAYOUT AND PROTOCOL

The RPM4 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 the bottom 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.

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 used as a part of day to day operation (see Section

3.5). These keys enter numerical values when editing.

Figure 8. 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 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/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

3.1.3 REMOTE [ENT] (ENTER) FOOTSWITCH

Operating the footswitch is the equivalent of pressing [ENT] on the front panel. The remote ENTER feature can be particularly convenient when running AutoTests (see

Section 3.3.10) in which the operator’s hands are not free or attention is on the device under test rather than the RPM4.

3.1.4 SOUNDS

RPM4 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

Invalid key press Change HPMS Lo Q-RPT

shut-off valve setting Leak check completed Upper or lower limit exceeded Pmax! (overpressure limit)

exceeded Hi Q-RPT is selected but Lo

Q-RPT is being pressurized

AutoTest in/out of tolerance reading

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

Descending two tone “blurp”. Four one second beeps (see Section 3.2.5, 3.3.1).

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).

Intermittent two second high frequency beep. The audible alarm is combined with flashing of the red, Lo Q-RPT Active LED on the HPMS (see Section 3.2.5, 3.3.1).

Ascending triad/descending triad ( see Section 3.3.10).

3.2 GENERAL OPERATING PRINCIPLES

3.2.1 PRESSURE READY/NOT READY

There is a Ready/Not Ready indicator LED on the RPM4 front panel. It is intended to provide the user with a clear and 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) and the stability limit can be set automatically by a AutoRange or AutoTest (see Section 3.3.4, 3.3.10). The Ready indication is often used when comparing the RPM4 and a test device to indicate when a valid reading can be made.

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.

3. OPERATION

3.2.2 GAUGE MODE, DYNAMIC COMPENSATION FOR ATMOSPHERIC PRESSURE

The RPM4 A70M/A20M-AF Q-RPTs are intrinsically absolute but they are also used for gauge measurement mode (see Section 3.3.3,  PR INCIPLE ). Gauge measurement mode is achieved by subtracting the value of atmospheric pressure, P using AutoZ (see Section 3.2.2). The AutoZ routine that measures P [AutoZ] whenever RPM4 is in the vented condition. This assures the continuous updating of the

value corresponding to atmospheric pressure. Gauge pr e s s u r e is the mea sur ed ab solut e

offset,G

pressure, P

, minus the atmospheric offset, P

gauge

offset,G

= Pu - P

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 uses

offset,G

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

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

offset,G

Later, when no longer vented, the change in atmospheric pressure, ΔP updated, is the difference between the current barometer reading, P

atm

atm,0

= P

atm

reading at the time of AutoZ execution, P

ΔP

Dynamic compensation for atmospheric pressure uses ΔP thus always compensating real time for changes in atmospheric pressure:

, from the Q-RPT’s absolute reading

offset,G

, is run by pressing

offset,G

. When AutoZ runs, and

offset,G

, is also recorded.

atm,0

, since P

atm

, and the barometer

atm

- P

atm,0

to correct the value of P

atm

offset,G

was

offset,G

gauge

= Pu - P

offset,G

- ΔP

atm

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 completely insignificant in the range of pressure covered by the RPM4 A70M/A20M-AF.

3.2.3 MULTIPE RANGES (Q-RPTS, AUTORANGE AND INFINITE RANGING)

RPM4 A 7 0 M/ A2 0 M- A F has two Quartz Reference Pressure Transducers (Q-RPTs). The A70M (10 000 psi) Q-RPT is designated the Hi Q-RTP. The A20M (3 000 psi) Q-RPT is designated the Lo Q-RTP. Which Q-RPT is currently active is continuously by characters in the upper right hand corner of the MAIN RUN screen and most other screens.

Each RPM4 Q-RPT has a default range which is its maximum range. Additional ranges, lower than the Q-RPT’s maximum, may also be created using AutoRange and AutoTest (see Sect ion 3.3.4 , 3. 3.10). Ranges created using AutoRange are temporary but may be saved with all their settings for reactiv ation (see Se ction 3. 4.1.1).

An RPM4 range is identified by a range screen showing the Q-RPT used by the range, its current unit of measure and its full scale pressure in gauge an d absolute measurement modes. The range screen is:

1. Q-RPT designator.

2. Type of range. DF for the Q-RPT’s default r ange; AR for a range created by AutoRange.

3. Q-RPT position designator.

4. Current pressure unit of measure.

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

Active A70M DF Hi psi 10000g/10000a

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

The ranges available on the RPM4 are accessed using [RANGE] (see Section 3.3.1) and/or created using [AutoRange] (see Section 3.3.4).

Most settings made in an RPM4 range, such as unit of measure, measurement mode, display resolution, and stability setting are specific to the range. Settings selected while one range is active apply to that range and not to other ranges. The range specific settings are stored with the range and recalled whenever the range is made active. This makes setting up ranges a convenient way to store and recall frequently used operating configurations. See Table 2 f or a li sti ng of RPM4 adjustments and settings and whether they are range, Q-RPT or system specific.

Table 2. Settings and what they are specific to

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

SETTING PURPOSE SPECIFIC TO SECTION

[UNIT] Set pressure unit of measure Range 3.3.2 [MODE] Set pressure measurement mode

[DISPLAY] Set bottom line display function System 3.3.6 [HEAD] Set fluid head correction height, fluid, unit

[AutoZ] Run AutoZ Q-RPT and measurement mode 3.3.9

Resolution Set pressure display resolution Range 3.4.2 Stability Set Ready/Not Ready stability test. Range 3.4.3 Upper Limit (UL) Set upper limit alarm Range 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

Cal Various Q-RPT and barometer calibration

(absolute, gauge)

of measure

Set system user preferences System 3.5.5

functions, including turning off absolute and negative gauge modes

Range 3.3.3

System 3.3.7

Q-RPT or barometer 3.5.8

3.2.4 AUTOMATED TEST AND CALIBRATION SEQUENCES

The RPM4 AutoTest function supports “Quick” and “File” automated calibration sequences. These automatically AutoRange the RPM4, setting its resolution, stability limit and upper limit based on the characteristics of the device under test. They also prompt the user through the increments of the calibration sequence and log calibration data. The AutoTest function should be used for most common calibration tasks, especially calibration of analo g pressure gauges (see Section 3.3.10).

3.2.5 HPMS (HIGH PRESSURE MOUNTING SYSTEM)

The HPMS (high pressure mounting system) holds the RPM4 at a convenient viewing angle and includes a valve and visual indicators to isolate and protect the RPM4’s 2 000 psi (A20M) Q-RPT when using the 10 000 psi (A70M) Q-RPT.

See Figure 10 for an HPMS schematic.  OPERATION Numerical references in this Section refer to Figure 9. In normal use, the operator’s only interaction with the HPMS is to operate the isolation valve

knob to connect and disconnect the Lo Q-RPT from the TEST port. The valve’s operation is prompted by the Valve Position LEDs (2, 4).

3. OPERATION

The Lo Q-RPT isolation valve (3) isolates and protects the Lo Q-RPT from the TEST port

when it is closed (knob fully CCW) and opens the Lo Q-RPT to the TEST port when it is open (knob fully CW).

The Valve Position LEDs (2, 4) indicate the position in which the valve knob should be set based on the current Q-RPT selection on the RPM4. If the Hi Q-RPT is selected, the LO Q- RPT SHUT OFF LED (2) is lit indicating that the valve knob should be turned fully CW to close the valve, protecting the Lo Q-RPT from high pressure. If the Lo Q-RPT is selected, the LO Q-RPT ACTIVE LED (4) is lit indicating that the valve knob should be turned fully CCW to open the valve, connecting the Lo Q-RPT to the test pressure.

The HPMS isolation valve (3) must always be in the closed position (knob fully CCW) when

operating at pressure greater than 3 000 psi (20 MPa).

The CAU TION LO Q-RPT ACTIVE LED (5) is used to indicate tha t the Lo Q-RPT is active and provide an alert when the Lo Q-RPT is active but a Hi Q-RPT ra nge is selected on th e RPM4.

The CAUTION LO Q-RPT ACTIVE LED (5) is driven by the value of pressure current ly measured by the Lo Q-RPT , it is not driven by the val ve positio n as the re is no se nsing of t he valve p osition.

The CAUTION LO Q-RPT ACTIVE LED (5) has three possible conditions:

• LED is OFF: The Lo Q-RPT is NOT active. The Lo Q-RPT is considered active when it measures a pressure greater than about 30 psig (200 kPa).

• LED ON continuously: The Lo Q-RPT IS active and the Lo Q-RPT is selected on the RPM4. The LED is lit as a reminder that the Lo Q-RPT is active and pressure over its maximum working pressure of 3 000 psi (20 MPa) should not be applied.

• LED is flashing ON/OFF accompanied by high frequency beeps and <!!LO Q-RPT ACTIVE!!> displayed by RPM4: Lo Q-RPT IS active and the Hi Q-RPT is selected on RPM4. The Lo Q-RPT should NOT be exposed to pressure when the Hi Q-RPT is selected. Exposing the Lo Q-RPT to pressures for which the Hi Q-RPT is normally used, will overpressure and damage the Lo Q-RPT Vent pressure from the RPM4 and shut off the Lo Q-RPT with the Lo Q-RPT shut off valve before continuing to use the Hi Q-RPT.

If the Hi RPT is selected with the Lo Q-RPT active, RPM4 goes into an alarm condition to avoid accidental overpressure of the Lo Q-RPT while using a Hi Q-RPT. The pressure on the Lo Q-RPT must be reduced to less than 30 psig (200 kPa) so that the CAUTION LO Q-RPT ACTIVE LED is OFF before shutting the Lo Q-RPT shut off valve and selecting the Hi Q-RPT.

The HPMS pressure relief valve (Figure 10, Ref 3) is set to open at 110 % of the RPM4 Lo Q-RPT maximum range. When the pressure applied to the Lo RPT reaches approximately 3 300 psi (23 MPa), the pressure relief valve will open exhausting gas to atmosphere and reducing pressure. Prior to opening the pressure relief valve, the RPM4 will have gone into an overpressure condition (see Section 3.4.4.1). If an overpressure condition occurs, reduce pressure as soon as possible. The pressure relief valve will reseat automatically and close when pressure is reduced.

Do NOT overpressure the Lo Q-RPT. The Lo Q-RPT may be damaged beyond repair by pressure greater than 3 300 psi (23 MPa). Q-RPT damage from overpressure is logged in user and factory maintenance pages and is not covered by the product warranty. The HPMS pressure relief valve should only be considered a last resort means of protecting the Lo Q-RPT. Following proper operating procedures, the Lo Q-RPT should never be overpressured.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

1. RPM4 A70M/A2 0M-AF Reference Pressure Monitor

2. Lo Q-RPT shut-off valve position LED

3. Lo Q-RPT shut-off valve

Figure 9. RPM4/HPMS front view

4. Lo Q-RPT active valve position LED

5. Lo Q-RPT active caution LED

3. OPERATION

1. HPMS TEST port (DH500 F)

2. Connection to R PM4 Lo Q-RPT (A20M) (3 000 psi)

3. Lo Q-RPT pressure relief valve (3 300 psi)

5. RPM4 A70M/A2 0M-AF Reference Pressure Monitor

6. Connection to RPM4 Hi Q-RPT (A70M) (10 000 psi)

4. Lo Q-RPT shut off valve

Figure 10. HPMS pneumatic schematic

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

3.2.6 DIRECT FUNCTION KEYS SUMMARY

Table 3 provides a brief summary of RPM4 direct function key operation. It may be useful to keep a copy of this summary near the RPM4/HPMS, especially when first becoming acquainted with its operation.

Local operation of RPM4 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 is in its MAIN RUN screen. Table 3 summarizes the operation of the direct function keys.

Table 3. Summary of RPM4 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.

The SDS function is not used in the A70M/A20M-AF configuration of RPM4.

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

Set up and optimize RPM4 features for a specific operating range and measurement mode.

Run automated leak checking routine.

View active range and toggle through available ranges. [ENT] on a range activates it.

Select pressure unit of measure for the active range. Choice of units available in this menu can be customized.

Select the pressure measurement mode for the active range (absolute, or gauge).

Menu of less commonly used internal functions and settings.

Menu of commonly used setup features including save/delete AutoRange ranges, set display resolution, set stability limit, set upper/lower, set up File AutoTest sequences and view AutoTest data.

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

3.3 DIRECT FUNCTION KEYS

3.3.1 [RANGE]

 PURPOSE

To view and/or change the active pressure measurement range and associated settings.

 PRINCIPLE

An RPM4 range is defined as a pressure span and associated settings (see Sect ion 3.2.3). An RPM4 may have multiple ranges. Each Q-RPT in the RPM4 system has a default range

which is its maximum span. The default ranges of the RPM4 A70M/A20M are 10 000 psi (A70M) and 3 000 psi (A20M). Additional ranges, lower than the Q-RPT’s maximum span, may also be created using AutoRange (see Section 3.3.4) or AutoTest (see Section 3.3.10).

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

3. OPERATION

Ranges created using AutoRange or AutoTest may be saved, with their settings, for reactivation (see Section 3.4.1).

The [RANGE] function key allows the available RPM4 pressure ranges to be viewed and selected.

 OPERATION

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

1. Q-RPT designator.

2. Type of range. DF for the Q-RPT’s default range; AR for a range created by AutoRange.

3. Q-RPT position designator.

4. Current pressure unit of measure.

5. Range’s full scale pressure in current unit of measure in gauge and/or absolute measurement mode depending on type of Q-RPT and range .

Active A20M DF Lo psi 3000g/3000a

Pressing the [+/-] key or the [RANGE] key again while in the RANGE functions toggles through displays of the other available ranges, from lo west range to high est range.

To select a range to become the active range, press [ENT] while the range is displayed. Any time a range change causes the active Q-RPT to change, the HPMS Lo Q-RPT

Isolation valve must be operated to connect or disconnect the Lo RPT from the TEST port. The green Lo Q-RPT Valve Position LEDs indicate the correct position of the Lo Q-RPT Valve Isolation Knob based on the RPM4 Q-RPT currently in use (see Section 3.2.5).

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

The HPMS Lo Q-RPT Isolation valve protects the Lo Q-RPT (3 000 psi max) from

overpressure when the Hi RPT is in use. Familiarize yourself with HPMS operation (see Section

3.2.5) before changing ranges and applying pressures. Always turn the Lo RPT Isolation Valve fully in the direction of the lighted green LED before applying pressure.

Range full scale limits are given in the pressure unit that is currently active for that range.

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

active range.

Many RPM4 settings and functions are range specific. See Table 2 for identification of

range specific settings.

For best metrological performance, vent the RPM4 Q-RPT before changing ranges.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

3.3.2 [UNIT]

 PURPOSE

To select the measurement mode (absolute, gauge), use [MODE] (see Section 3.3.3).

To select the unit of measure in which RPM4 displays pressure values.

 PRINCIPLE

RPM4 allows the unit of measure in which pressure values are displayed to be changed. RPM4 A70M/A20M-AF supports 13 standard pressure units of measure as well as user

defined units. To simplify operation, quick access to six units is made available under the [UNIT] key. The [UNIT] key contents can be customized by the user to any configuration of six units (see Section 3.5.6).

Internally, RPM4 always operates in Pascal (Pa), the SI unit of pressure. Values of pressure are represented in other units by the application of conversion factors to convert from Pa (see Section 7.1.1).

 OPERATION

To change the active pressure unit of measure for a range, press [UNIT] from the MAIN RUN screen while the range is active. The display is:

1psi 2MPa 3kPa 4bar

The cursor is on the number correspo nding to the active pre ssure unit of measure for t he 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.

The pressure unit of measure selected is range specific. When in a given range, all functions and settings are represented in the current measurement unit 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 range unit.

See Section 7.1.1 for tables of the conversion factors used by RPM4.

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 choice of up to 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 by reset (see Section 3.5.9.2).

3. OPERATION

3.3.3 [MODE]

 PURPOSE

To select the unit of measure, use [UNIT] (see Section 3.3.2).

To set the measurement mode (absolute, gauge) for the active range.

 PRINCIPLE

RPM4 A70M/A20M-AF supports simple, one-step switching between two measurement modes:

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

from zero absolute to full scale.

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.

The RPM4 A70M/A20M-AF Q-RPTs measure pressure relative to a sealed vacuum reference and are intrinsically absolute. Gauge mode is accomplished by offsetting of atmospheric pressure with dynamic compensation for atmospheric pressure changes between offsets using an on-board barometer (see Section 3.2.2). Access to absolute operation can be turned OFF (see Section 5.3.5).

When changing modes for a range, if the full scale of the range is 100 psi (700 kPa) or greater, the full scale is the same in both absolute and gauge modes. If the full scale is less than 100 psi, the gauge mode full scale is 14.5 psi (100 kP a) lower than the absol ute mode full sca le.

Measurement mode selection is range specific.  OPERATION

To change the active measurement mode for a range, press [MODE] from the MAIN RUN screen while the range is active. The display is:

Measurement mode: 1absolute 2gauge

Select the desired measurement mode and operation returns to the main run screen with the selected measurement mode active. If absolute measurement mode has been turned OFF in calibration (see Section 5.3.5), absolute mode is not available.

Certain RPM4 settings, including AutoZ ON/OFF (see Section 3.5.1) are range AND measurement mode specific. See Table 2 for a listing of settings and what they are specific to.

Absolute mode capability can be turned OFF in the calibration function (see Section 5.3.5). When absolute mode is turned OFF, only gauge mode can be activated. <Gauge mode only, other modes OFF> is displayed when [MODE] is pressed.

3.3.4 [AUTORANGE]

 PURPOSE

To automatically set up RPM4 to optimize its measurement characteristics and features for a specific, user defined pressure range of operation.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

 PRINCIPLE

RPM4 A70M/A20M-AF is designed to support the calibration and test of a very wide variety of test ranges in absolute and gauge measurement modes.

The AutoRange function simplifies the task of selecting the Q-RPT best suited to cover a specific test range and setting measurement parameters appropriately for that specific range. These a re set automatically based on operator entry of desired measurement mode, pressure unit of measure and range full scale. The selections and settings made by AutoRange are summarized in Table 4.

A range set up using AutoRange and all its range specific settings, may be saved for recall using [SETUP], <1range> (see Section 3.4.1). Saved ranges are available for later selection using [RANGE] (see Section 3.3.1). If a range created by AutoRange is not saved, it is overwritten by the next AutoRange or erased when another range is selected.

Press [ENT] from the main run screen in Rate DISPLAY mode to use the [AutoTest] function to AutoRange RPM4 based on DUT tolerance (see Section 3.3.10).

Table 4. Settings made by AutoRange

SETTING/

SELECTION

Unit Set pressure unit of

Mode Set pressure

Full scale Establish span

Q-RPT Select most

Upper limit Set maximum pressure

Resolution Set display resolution 10 ppm of AutoRange

Stability Limit Set Ready/Not Ready

PURPOSE

measure

measurement mode (absolute, gauge)

maximum

appropriate Q-RPT to cover range and mode.

alarm limit.

stability criterion.

SETTING BY

[AUTORANGE]

Operator specified during AutoRange

Q-PRT with lowe s t default full scale that is greater than the AutoRange full scale

105 % of AutoRange full scale pressure

span or 1 ppm of default QRPT span, whichever is larger

50 ppm of AutoRange span or 2 ppm of default Q-RPT span, whichever is larger

SETTING BY [AUTOTEST[

(see Section 3.3.10)

Operator specified in AutoTest definition

Maximum pressure of AutoTest definition

Q-PRT with lowe s t default full scale that is greater than the maximum pressure of AutoTest definition

105% of maximum pressure of AutoTest definition

10% of DUT tolerance or 1 ppm of default QRPT span, whichever is larger.

10% of DUT tolerance or 2 ppm of default QRPT span, whichever is larger

SECTION

3.3.2

3.3.3

None

1.2.2.1

3.4.4

3.4.2

3.4.3,

3.2.1

3. OPERATION

 OPERATION To use the AutoRange function, press [AutoRange] and respond to the RPM4’s prompt s.

Select AutoRange measurement mode: The screen is identical in appearance and

function to the [MODE] screen (see Section 3.3.3).

Select pressure unit of measure: The screen is identical in appearance and function

to the [UNIT] screen (see Section 3.3.2).

Enter the AutoRange full scale pressure: Enter the full scale pressure value in the

<------> entry field and press [ENT]. If the full scale value entered cannot be covered by RPM4, an error message appears. If the full scale value can be covered, AutoRange proceeds to the range display.

View proposed AutoRange range: The proposed AutoRange range screen is:

1. Indication that this is a screen of the proposed AutoRange range.

2. Designator and position of the Q-RPT that AutoRange has selected to cover the AutoRange full scale and measurement mode.

3. Pressure unit of measure specified in AutoRange.

4. AutoRange full scale pressure in gauge mode and absolute.

AutoRange A70M Hi psi 5000g/5000a

If AutoRange selects a Q-RPT but you would like to use the other one, the [ ] and [ ] cursor

control keys may be used to toggle between Q-RPTs so that the other can be selected.

Accept proposed AutoRange: To accept the proposed AutoRange and go to the MAIN

RUN screen with the new AutoRange range active, press [ENT] or [AutoRange]. To modify the AutoRange full scale, measurement mode or pressure unit of measure, use [ESC] to back through the AutoRange screens and make changes.

The HPMS Lo Q-RPT Isolation Valve protects the Lo Q-RPT (3 000 psi max) from

overpressure when the Hi Q-RPT is in use. Familiarize yourself with HPMS operation (see Section

3.2.5) before changing ranges and applying pressures. Always turn the Lo Q-RPT Isolation Valve fully in the direction of the lighted green LED before applying pressure.

To verify or confirm the range from the MAIN RUN screen, use [+/-] or [RANGE] to view the

active range (see Section 3.3.1).

See Table 4 for a listing of all selections and settings affected by AutoRange and their values.

3.3.5 [LEAK CK]

 PURPOSE

To run an automated leak check routine that determines the leak rate of the system connected to the RPM4/HPMS TEST port.

 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/HPMS TEST port.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

The principle of the LEAK CHECK function 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.

 OPERATION

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 much longer for large pressure changes and as volume and pressure increases.

To run a leak check, first set the pressure to the desired leak check pressure.

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

Set leak check time:

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

15 s

Edit the leak check time if desired (minimum 1, maximum 999 seconds) and press [ENT]. Press [ENT] again when ready to start the leak test. The leak test display is:

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

2. Active Q-RPT position indicator

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

4566.8 psi g Hi Leak testing 13 s

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

1. Total pressure change from start to finish of leak check time.

2. Indicator of Q-RPT used to run the leak check.

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

∆P - 0.12 psi g Hi Rate 0.008 psi/sec

From the leak check results screen, press [ENT] to repeat the leak 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 leak check, press <2view>. If NO leak

check data is stored (i.e., if the RPM4 has never run a leak test or a reset has cleared previous leak test 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.

3. OPERATION

Leak check is range specific in the sense that a leak check is run using the active range. 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 leak check run regardless of the range that is now active. The results screen includes the range indicator to indicate the range in which the leak check 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 display.

 PRINCIPLE

RPM4 supports a variety of advanced pressure measurement functions that are displayed on the second (bottom) line of the RPM4 display. In summary, the available display functions included are:

AVERAGE Calculates the average measured pressure 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 magnitude 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.

RATE Calculates and displays the current rate of change of pressure in current

pressure units/second (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 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 3.2.1).

DEVIATION Continuously calculates and displays the difference between the pressure

measured by RPM4 and a target pressure 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 pressure measurement from the RPM4’s two Q-RPTs to be displayed

simultaneously (see Section 3.3.6.4).

HI/LO Records and displays maximum and minimum pressures 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 pressure measured by the active range of RPM4

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 gauge is 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

is used when a simple display of pressure measured by the RPM4 active range with minimal additional information is desired.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

 OPERATION To set the DISPLAY function press [DISPLAY] from the main run screen.

The display is:

The cursor is on the active DISPLAY function. Selecting a DISPLAY function returns to the main run screen with the selected function active. See Sections 3.3.6.1 to 3.3.6.7 for information on each of the DISPLAY choices.

The DISPLAY selection is NOT range specific. A DISPLAY selection made in one range applies to all ranges.

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 second.

3.3.6.1 AVG (AVERAGE)

1avg 2rate 3dev 4RPT 5HiLo 6freeze 7clean

 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. Press [ENT] to return to the main run screen with the Average DISPLAY active.

With the Average DISPLAY active the main run screen is:

1. Average measured pressure over last completed averaging period.

2. Standard deviation in active pressure unit of measure of last completed averaging period.

3. Countdo wn in seconds until completion of ongoing averaging period.

3001.57 psi a Hi δ 0.03 18Avg

3. OPERATION

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 active pressure unit/second.

3. Countdo wn in seconds until completion of ongoing averaging period.

3001.51 psi a Hi R 0.01 18Avg

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

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 3.2.1). 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,  Principle.

The AutoTest function (see Section 3.3.10) to AutoRange RPM4 based on DUT characteristics and run an automated test sequence is accessed by pressing [ENT] from the Rate run screen.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

 OPERATION To activate the Rate DISPLAY press [DISPLAY], <2Rate>. Pressing <2Rate>

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 pressure in current pressure unit per second.

8455.25 psi a Hi R 0.03/sec

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 3.2.1). 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.

The Rate DISPLAY is the default RPM4 main run screen display.

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

See Section 3.3.6,  Principle.

 OPERATION

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

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 pressure - target pressure

Target:

9000.0 psi a

3. OPERATION

With the Deviation DISPLAY active the main run screen is:

1. Deviation of current pressure from the target value.

2. Target value.

D -1.8 T9000.0

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 and without going through the DISPLAY menu.

8998.2 psi a zH3

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).

3.3.6.4 RPT

 PURPOSE To activate the RPT DISPLAY.

See Section 3.3.6,  Principle.

 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 display is referred to as the “inactive” Q-RPT. It is “inactive” in the sense that all RPM4 functions and settings such as UNIT and RES still apply to the “active” Q-RPT. To make changes to the “inactive” Q-RPT, for example to change its pressure measurement unit, it must be made the active Q-RPT by a conventional range change (see Section 3.3.1).

To activate the RPT DISPLAY, press [DISPLAY], <4RPT>. Operation returns to the MAIN RUN screen with the inactive Q-RPT displayed on the display’s bottom line. The range of the inactive Q-RPT is always the default range, not an AutoRanged range (see Section 3.2.3).

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

With the RPT DISPLAY active the main run screen is:

1. Active Q-RPT display.

2. Inactive Q-RPT display with Ready/Not Ready indicator on far left (<*> indicates Ready).

2010.66 psi a zHi *14.27 psi g zLo

When the RPT display is active, executing a range change to a range on 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.

With the Hi/Lo DISPLAY active the main run screen is:

9989.2 psi a zHi

1. Highest pressure observed since Hi/Lo reset.

2. Lowest pressure observed since Hi/Lo reset.

H 9991.5 L 9987.3

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 pressure measurement unit, mode or range 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. OPERATION

3.3.6.6 Freeze

 PURPOSE

See Section 3.3.6,  Principle.

To activate the Freeze DISPLAY.

 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 range of RPM4 when [ENT] was pressed (displays 0.00 by default when Freeze DISPLAY is first activated).

4435.6 psi a zHi F 4420.7

Pressing [ENT] causes the current pressure measured by the active RPM4 Q-RPT to be captured and displayed.

If the pressure measurement unit, mode or range 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).

3.3.6.7 Clean

 PURPOSE To activate the Clean DISPLAY.

See Section 3.3.6,  Principle..

 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.

99.76 psi a zHi

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

DISPLAY choice (see Section 3.3.6).

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

3.3.7 [HEAD]

 PURPOSE

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

 PRINCIPLE

RPM4/HPMS measures gauge or absolute pressure at the height of the rear panel TEST port. Frequently, when performing a calibra tion or tes t, the de vice or system under test is at a diffe rent height than the RPM4/HPMS’s TEST port. This difference in height, frequently called head, can cause a significant difference between the pressure measured by the RPM4/HPMS at its TEST port height and the pressure actually appl ied t o the devi ce under te st whic h is at a d ifferent heig ht. In this case, it is useful to make a head correction to the pressure measured by the RPM4 in order to predict the pressure actually applied at a different hei ght.

RPM4 can accurately determine “head” pressures for gases (nitrogen, helium and air) and liquids (oil, water) as the pressurized medium. In calculating the head value, standard gravity (9.80665 m/s density correcting for temperature of 20°C and the measured pressure using the gas’s compressibility factor to 100 MPa (15 000 psi) and extrapolated above 100 MPa. Oil density is taken to be 850 kg/m to be 998.2321kg/m

) is used. Gas densities are calculated from the selected gas’s standard

, the density of typical calibration oils at 20°C. Water density is taken

(20°C). A custom liquid density may also be specified.

The [HEAD] function key is used to specify the height difference between the RPM4/HPMS TEST port and another height. Entering a height of zero turns the function off. The height units and the test medium can be changed using [SPECIAL], <3Head> (see Section 3.5.3).

As a general rule with RPM4 A20M/A70M-AF, use of the HEAD function to assure in tolerance measurements with RPM4 A70M/A20M-AF is necessary only when the head exceeds 10 in. (25 cm) if the medium is a gas.

 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.

+ 8 in 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 pressure measurement is the middle of the RPM4 TEST port. The head height should be entered as a positive value if the device or system under test is higher than the RPM4 and negative if it is lower.

The HEAD function is NOT range specific. The HEAD ON or OFF status remains the same as Q-RPTs and ranges are changed. Edits made to the head settings are independent of active range or Q-RPT.

3. OPERATION

When a head correction is being applied, it is indicated by <h> in the fourth character from the right 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.

The default head height unit is inches and the fluid species is Nitrogen (N2).To change units of head height between inches and centimeters and to change the test fluid species, use [SPECIAL], <3head> (see Section 3.5.3).

3.3.8 [SDS]

 PURPOSE

The SDS function is not used in RPM4 A70M/A20M-AF.

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).

3.3.9.1 [AUTOZ] IN GAUGE MODE

 PURPOSE To “rezero” the active Q-RPT in gauge measurement mode.

See Section 3.51,  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 3.51). 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 gauge measurement mode, use [MODE] to set 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.

RPM4/HPMS A70M/A20M-AF 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 considers unusually large, <Confirm 0 gauge P!> is displayed. Check that zero gauge pressure is applied to the Q-RPT module rear panel TEST(+) port and the ATM port is open to atmosphere and unobstructed.

Allow the RPM4 to stabilize at atmospheric pressure and ambient temperature for 2 to 3 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 is OFF for the active range, and measurement mode, <AutoZ OFF> is displayed when [AutoZ] is pressed.

To run AutoZ in absolute measurement mode, use [MODE] to 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

AutoZ Hi abs by: 13ntry 2COM2 3Lo RPT

Selecting <1entry> allows the value of P Selecting <2COM2> allows the value of P

DHI RPMx connected to RPM4’s COM2 communications port. Selecting <3Lo RPT > is shown only if the Hi Q-RPT is active. 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 to stabilize at atmospheric pressure and ambient temperature

for 5 to 10 minutes before running AutoZ in absolute mode.

to be entered from the front panel keypad.

std,0

to be read automatically from another

std,0

3. OPERATION

If running AutoZ results in a value of P

that is greater than ± 0.005 % FS

offset

of the span of the Q-RPT that is being AutoZeroed, the Q-RPT and/or the reference used as the source of P Before activating a new P

may be out of tolerance or the AutoZ process may have been faulty.

std,0

greater than ± 0.005 % FS of the active Q-RPT, check to

offset

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

Before running AutoZ in absolute mode, use <SETUP>, <2res> to set the resolution of the active range to 0.001 or 0.0001%FS.

AutoZ by entry allows the value of P

(see Section 3.5.1,  PRINCIPLE) to be

std,0

entered manually from the RPM4 front panel. This provides a simple way of AutoZeroing relative to an independent reference device such as a house barometer that does not interfaced directly with RPM4.

To 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

14.03 psi a Hi Pstd,0:0.00

) in the same unit of measure as the top line display and press [ENT]. RPM4 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

The value of P

offset

) value.

std,0

is always in Pascal (Pa). The value of P

Old P New P

: 0 Pa

offset

: 2745 Pa

offset

std,0

is entered in the

current pressure unit of measure.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

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 COM2 communications port. The RPMx is read and the new P

is calculated automatically.

offset

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.

14.03 psi a Hi Pstd,0:0.00

Observe the displayed pressures and verify that they are stable. When ready, press [ENT] to cause AutoZ to run. RPM4 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

: 0.0 Pa

offset

: 2745 Pa

offset

For RPM4 to communicate with an RPMx connected to its COM2 port, the RPM4 and the RPMx RS-232 interfaces must be set up properly (see Section 3.5.2). If, the RPM4 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>.

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 when the active Q-RPT is the Hi Q-RPT. AutoZ by Lo RPT allows the Lo Q-RPT in an the RPM4 to serve as the AutoZ reference (source of P The Lo Q-RPT is read and the new P

) (see Section 3.5.1,  PRINCIPLE).

std,0

is calculated automatically.

offset

To access run AutoZ by Lo Q-RPT 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.

14.03 psi a Hi Pstd,0: 14.08

Observe the displayed pressures and verify that they are stable. When ready, press [ENT] to cause AutoZ to run. RPM4 logs both readings and calculates a new AutoZ offset value. The display is:

: 0 Pa

offset

: -345 Pa

offset

Old P New P

Press [ENT] to activate the new value of

or [ESC] to start over.

offset

The value of P

is always displayed and entered in Pascal (Pa).

offset

3. OPERATION

3.3.10 [ENT] (RUN AUTOTEST)

 PURPOSE

Run AutoTest is accessed by pressing [ENT] from the Rate or Clean DISPLAY mode (see

Section 3.3.6). In other DISPLAY modes, the function of [ENT] is specific to the mode.

To run the AutoTest function which runs a calibration test sequence (Quick Test or File Test).

 PRINCIPLE RPM4 supports AutoTest automated sequences to assist in the testing or calibration of

analog gauges and other pressure sensitive devices. The AutoTest function is intended to:

• AutoRange the RPM4 (see Section 3.3.4) to the range of the DUT being tested with settings appropriate for the tolerance of the DUT.

• Step the operator through a planned sequence of test pressure increments if desired.

• Alert the operator to possible out of tolerance conditions at each test point.

• Log test data in RPM4 that can be viewed following the test.

There are two types of AutoTest: Quick AutoTest and File AutoTest.

• Quick AutoTest: The DUT and test parameters are entered “on the fly” during the initialization of the test, then the test is executed if desired. In Quick AutoTest tests, the test points are defined in % of test FS pressure.

• File AutoTest: The DUT and test parameters are stored in a file (see Section 3.4.5.2) and retrieved when a DUT is to be te sted. In File AutoTe sts, test p oints ar e defined individua lly.

AutoTest operation is oriented towards running tests in which the pressure is set to the DUT cardinal point indication and then the actua l reference pressu re present is read from the RP M4.

AutoTest Settings and Calculations

The data required to initialize an AutoTest is either entered “on the fly” (Quick AutoTest) or retrieved from a file (File AutoTest). The data items required are:

• Pressure measurement mode (gauge or absolute).

• Pressure unit of measure.

• DUT full scale in pressure unit of measure.

• DUT tolerance in ± % FS (full scale).

• Test increment in % FS (Quick AutoTest) or number of test increments and the value of

each increment in the pressure unit of measure (File AutoTest).

• Test point sequence: ascending, descending or both (Quick AutoTest only).

The initialization data is used to AutoRange the RPM4 appropriately for the DUT and test to be run. At the end of the AutoTest initialization, the RPM4 is AutoRanged as follows (see Section 3.3.4, Table 4):

• Q-RPT: The Lo Q-RPT is active if the maximum pressure in the Au toTest is less than 20 MPa (3 000 psi), the Hi Q-RPT is active if the maximum pressure in the AutoTest is greater than 20 MPa (3 000 psi).

• Pressure measurement mode and unit: As specified in the AutoTest initialization.

• Display resolution: The DUT tolerance divided by 10 and rounded to the nearest digit, or

1 ppm of Q-RPT span, whichever is greater.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

• Stability test for Ready/Not Ready indication(see Section 3.2.1): The DUT tolerance divided by 10, or 2 ppm of Q-RPT span, whichever is greater.

• Upper limit (UL): The DUT full scale plus 5 %, or the Q-RPT’s maximum UL, whichever is less (see Section 3.4.4).

To AutoRange the RPM4 based on DUT characteristics but not execute an AutoTest, the AutoTest can be aborted just after the initialization. Then the RPM4 is set up appropriately for the DUT to be tested but the AutoTest increments don’t execute.

See OPERATION in this Section for information on running a Quick or File AutoTest. See Section 3.4.5.2 for information on setting up File AutoTest files. See Section 3.4.5.1 for information on viewing the data files that result from running a File

AutoTest.  OPERATION

To run an AutoTest, press [ENT] from the Rate, RPT or Clean run screen (DISPLAY modes that do not use [ENT] (see Section 3.3.6)). The display is:

Run AutoTest: 1Quick 2File

Select <1Quick> to run a Quick AutoTest or <2File> to run a File AutoTest (see PRINCIPLE above in this Section).

If <2File> is selected, the File AutoTest file number must be specified (see Section 3.4.5.2). The test is initialized automatically using the information in the File AutoTest file and test execution begins with the <SET VALVE FOR RPT> screen (see Section 3.2.10.2).

If <1Quick> is selected, test initialization begins with the <Measurement mode:> screen (see Section 3.2.10.1)

3.3.10.1 AUTOTEST INITIALIZATION

When <2File> is selected to run a File AutoTest, the test initialization information is obtained from the file selected. Operation proceeds directly to the test confirmation. The RPM4 asks the operator to confirm the range of the AutoTest (<ENTER to run…>), AutoRanges (see Section 3.3.4) and operation proceeds directly to test execution (see Section 3.3.10.2).

When <1Quick> is selected to run a Quick AutoTest, the display is:

This selection provides the choice between running the last Quick AutoTest, including AutoRanging the RPM4 based on the previously entered DUT characteristics or setting up a new Quick AutoTest definition. Select <1yes> to rerun the last Quick AutoTest (see below in this Section). Select <2no> to define a new Quick AutoTest.

un current Quick

AutoTest: 1yes 2no

When <2no> is selected from the <Run current Quick AutoTest> screen, the AutoTest set-up/edit routine is accessed. The information needed to AutoRange RPM4 based on the DUT characteristics is then collected in successive screens as follows.

• <Measurement mode:>: Select <1gauge> or <2absolute> depending on the measurement mode of the DUT being tested (see Section 3.3.3).

• <Press ure units of measure>: The units of measure screen from the [UNIT] function key is presented (see Section 3.3.2). Select the desired pressure unit of measure. The choice of units m ay be modifi ed (see Se ction 3. 5.6).

• <DUT full scale:>: Enter the full scale pressure (maximum pressure) of the DUT in the measurement mode and pressure units that have been specified in the previous two steps.

3. OPERATION

• <DUT tolerance:>: Enter the DUT measurement uncertainty, accuracy or precision specification as desired in ± % FS (percent of full scale). This value will be used to determine appropriate RPM4 resolution and stability test settings.

• <Test increment:>: Enter the test increment in % FS of the DUT. When executing the test, the test increments will be from zero to the DUT full scale, dividing by the value of the increment. If a non-even increment value is entered, the actual increments will be rounded to the lower number of increments. For example, if the DUT full scale is 10 000 psi and the increment specified is 42 %, the Sequence will run points of 0, 5 000 and 10 000 psi because 42 % goes into 100 less than three but more than two times.

• <Test point sequence:>: Select <1up> for the AutoTest sequence to run from zero to the DUT full scale; <2down> for the sequence to start at the DUT full scale and run down to zero, <3u&d> for the sequence to run from zero to the DUT full scale and back to zero; <4d&u> for the sequence to run from the DUT full scale down to zero and back to the DUT full scale.

After the last test definition entry, a screen is offered for the user to check that the correct test has been defined or selected and that it does not exceed the range of the device or system being tested. :

1. Indication of minimum and maximum pressure included in the sequence which is about to run.

ENTER to run psi g

0.000 to 5000.0

Pressing [ESC] returns to the AutoTest selection screen without AutoRanging the RPM4 and without sequence execution. Pressing [ENT] causes the RPM4 to AutoRange based upon the DUT characteristics (see Section 3.3.4) and the AutoTest proceeds to text execution (see Section 3.3.10.2). To AutoRange the RPM4 based on DUT characteristics but not run a test sequence, [ESC] right after AutoRanging completes (at the <Set valve for …> screen).

3.3.10.2 TEST EXECUTION

The last step of test initialization is to AutoRange the RPM4 (see Section

3.3.10.1), then test execution begins.

The first step of test execution is to set the HPMS Lo Q-RPT isolation valve correctly for the Q-RPT that will be used to run the test (see 3.2.5). The RPM4

et valve for XX RPT et supply to DUT FS

display is (<XX> is Lo or Hi): Set the HPMS isolation valve to shut off or use the RPM4’s Lo Q-RPT as indicated

by the HPMS valve indicator LED (see Section 3.2.5). Turn the valve knob fully towards the lit valve indicator LED until it reaches its stop. If using a GPC1 to adjust pressure, set the GPC1 supply regulator so the GPC1 supply is equal to the DUT full scale pressure (see the GPC1 Operation and Maintenance Manual). Press [ENT] when ready to proceed with the test.

To abort the test but use the RPM4 with the settings for the DUT that was initialized, press [ESCAPE] from the <SET VALVE FOR xx PRT> screen. This can be useful for setting up the RPM4 to make DUT adjustments or run tests other than the one defined by the AutoTest.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

The display is:

0.0 psi g Lo xercise DUT & [ENT]

The top line is the standard RPM4 run screen indicating the current measured pressure (see Section 3.1.1). Exercise th e DUT if desi red using th e top line in dicati on of the measured pressure and press [ENT] when complete.The display is:

1. Standard RPM4 run screen indicating current measured pressure.

2. Number of this test point/the total number of test points in the sequence.

3. Pressure to set for this increment in current pressure unit of measure and measurement mode.

0.0 psi g Lo Set 0.0 1/11

Adjust the pressure to the <Set nnnn> value indicated. Set the pressure so that the DUT, NOT the RPM4, indicates the <Set nnnn> value.

Once the specified pressure has been set, press [ENT]. If the RPM4 pressure reading is in Not Ready condition (see Section 3.2.1), the RPM4 makes an invalid entry sound and displays <Pressure NOT READY, TRY AGAIN>. Correct the conditions that are causing the RPM4 reading to be excessively unstable and press [ENT] again. If the RPM4 pressure reading is in Ready condition, the RPM4 makes a valid entry sound and the display is:

1. Standard RPM4 run screen indicating current measured pressure.

2. Number of this test point/the total number of test points in the sequence.

3. <F> to indicate freeze (see Section 3.3.6.7) followed by the RPM4 pressure reading in current units of measure captured when [ENT] was pressed in the previous <Set> screen. This is the reference pressure that was applied to the DUT when the DUT indicated the cardinal point. The frozen pressure value flashes if the reading was out of tolerance (definition of out of tolerance is: Set point – RPM4 reading > DUT tolerance)..

497.7 psi g Lo F497.6 OT 2/11

Press [ENT] to accept this test point and proceed to the next test point or [←] to repeat the point.

Repeat the set pressure, take reading and accept data procedure until all points in the sequence have been accepted.

After the last pressure point in the sequence has been accepted the display is:

AutoTest complete 1data 2new 3repeat

Select <1data> to view the data collected in the AutoTest that was just completed (see Section 3.4.5.1).

Select <2new> to run a new Quick or File AutoTest. Select <3repeat> to repeat the AutoTest that was just completed. Press [ESCAPE] to return to the main run screen.

3. OPERATION

3.4 [SETUP]

 PURPOSE [SETUP] accesses a menu of functions and features commonly used in setting up and using RPM4.

 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> Save and delete ranges created by AutoRange (see Section 3.4.1). <2res> Adjust the resolution of pressure displays (see Section 3.4.2). <3stab> Adjust the pressure stability limit that is the criterion for the Ready/Not Ready indication

(see Section 3.4.3).

<4UL> Adjust upper pressure limit alarm (see Section 3.4.4). <5ATest> Set up File AutoTest files and view data files resulting from running AutoTests (See

Section 3.4.5).

3.4.1 <1RANGE>

 PURPOSE

Save AutoRange ranges and associated settings for recall. Delete previously saved AutoRange ranges.

 PRINCIPLE

The RPM4 AutoRange function creates a range and automatically sets various operating parameters proportionally to the range (see Section 3.3.4). Operating settings can then be changed by the user. Many operating settings are specific to the cu rrent range (see Tabl e 2).

[SPECIAL], <1range> allows the AutoRange range and associated settings to be saved for recall using the [RANGE] key (see Section 3.3.1). This can avoid having to recreate frequently used ranges and settings.

[SPECIAL], <1range> is also used to delete ranges that have been saved but are no longer needed.

3.4.1.1 SAVING AN AUTORANGE RANGE

 OPERATION

To save a range created by AutoRange, the range must be the active range. Use AutoRange or AutoTest to create the range (sees Sections 3.3.4, 3.3.10) and then make any desired feature and setting adjustments.

Once the AutoRange range is set up as desired, press [SETUP], <1range>, <1save>. The display is:

1. Indication that this is a range to be saved.

2. Designator and position of the Q-RPT used by the range to be saved.

3. Pressure unit of measure of the range to be saved.

4. Full scale pressure of the range to be saved in gauge mode and absolute mode if available.

Save range A70M Hi psi 4000g/4000a

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

Press [ENT] to save the range or [ESC] to re turn to the MAIN RUN s cr e en w it h ou t saving the range.

Default (<DF>) Q-RPT ranges cannot be saved. They are permanent.

Duplicate AutoRange ranges cannot be saved. A duplicate AutoRange range is a range that has the same measurement mode and full scale and uses the same QRPT as a range that has already been saved.

3.4.1.2 DELETING AUTORANGE RANGES

 OPERATION

To delete a single saved AutoRange range, press [SE TUP ], <1range>, <2delete>. If there are any saved ranges available to delete, the display is:

1. Indication that the cursor control keys may be used to toggle through the saved ranges to select the one to be deleted.

2. Designator and position of the Q-RPT used by the range to be deleted.

3. Pressure unit of measure of the range to be deleted.

4. Full scale pressure of the range to be deleted in gauge mode and absolute mode if available.

< and > A70M Hi psi 4000g/4000a

Use the cursor control keys to toggle through the ranges available to be deleted. When the desired range to be deleted is displayed, press [E N T]. If you are sure you want to delete this range, press [ENT] again in response to the <Delete?> query. [ESC] returns to the <AutoRange:> screen without deleting a range.

To delete all of the saved AutoRange ranges, press [SETUP], <1range>, <3delete a ll> . If you are sure you want to delete all the ranges, respond <1yes> to the <Delete all saved ranges?> query. If not, respond <2no>.

3.4.2 <2RES> (RESOLUTION)

 PURPOSE

To set the resolution with which measured pressures and other pressure indications and settings are displayed.

 PRINCIPLE

The resolution with which RPM4 displays pressure values can be adjusted. This feature can be used to reduce the resolu tion when lower precision measur ements are being made and excess resolution might confuse or dist ract the op erator.

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 1 500 psi is 1 500 X 0.001 % = 0.015 which is rounded down to 0.01 psi.

Default resolution is 10 ppm of active range span. Resolution is set automatically by

AutoRange (see Section 3.3.4) and by AutoTest initialization (see Section 3.3.10).

3. OPERATION

 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 range specific. A resolution setting made in one range does NOT

affect other ranges.

The maximum resolution setting is limited in AutoRange ranges that are less than 10% of

the Q-RPT default full scale.

3.4.3 <3STAB>

 PURPOSE

To view and/or adjust the stability test that is the Ready/Not Ready criterion for the active QRPT and range.

See Section 3.2.1 Pressure Ready/Not Ready.

 PRINCIPLE

RPM4 continuously monitors the rate of change of pressure measured by the active Q-RPT and compares this rate to the active stability limit to make a Ready/Not Ready determination (see Section 3.2.1). 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 when using AutoRange is + 0.005% FS of active range span. Default

statbility when AutoRanging as part of an AutoTest is 10% of the DUT tolerance (see Section

3.3.4, Table 4).

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:

Stability limit: Hi

0.5 psi/s

Edit the desired stability limit setting. [ENT] activates the stability limit for the active range and returns to the main run screen Press [ESC] to return to the MAIN RUN screen with no change to the stability limit.

The stability setting is range specific. A stability setting made in one range does NOT

affect other ranges.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

3.4.4 <4UL> (UPPER LIMIT)

 PURPOSE

To set the upper pressure limit value for a pressure range and measurement mode.

 PRINCIPLE

The UPPER LIMIT function provides the user with a settable pressure limit at which an alarm sounds.

When the limit is reached, RPM4’s beeper sounds intermittently as long as pressure is above 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 range 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 a system to which RPM4 is connected. For example, it might be set just over the full scale of a device under test (DUT) that is being calibrated. Note that using AutoRange or AutoTest automatically sets the UL to just above the AutoRange full scale (see Sections 3.3.4, 3.3.10).

The default upper limit is 105 % of AutoRange span or 102 % of Q-RPT default (maximum)

range when AutoTest is used, whichever is lower.

 OPERATION

To view or edit upper limit of the active range press [SETUP], <4UL>. The display is:

Upper limit: Hi

1. Entry field for upper limit value in active pressure unit of measure and measurement mode.

10200 psi a

Edit the upper limit value as desired. The maximum upper limit is 105 % of span in an AutoRange range or 102 % of default Q-RPT full scale, whichever is smaller. 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.

When the upper limit has been exceeded, the display of current pressure flashes and a beep sounds for 3 seconds on/2 seconds off intervals. Reduce the pressure applied to RPM4 so that it is below the upper 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 absolute mode.

3.4.4.1 OVER PRESSURE FUNCTION

In addition to the UL function, RPM4 has an over pressure function. The over pressure function executes when a Q-RPT measures a pressure that is

greater than 104 % of the Q-RPT’s default span. This is 3120 psi (215.2 MPa) for the A20M Q-RPT and 10400 psi (717.2 MPa) for the A70M Q-RPT.

3. OPERATION

The over pressure function ca uses the measured pressure display to flash. The overpressure function also logs the time and date of the overpressure condition in both user and factory logs to assist in incident diagnosis (see Section 3.5.7.5).

To recover from an overpressure condition, cycle RPM4 power. Before cycling power, be sure to correct the condition that caused the overpressure.

3.4.5 <5ATEST>

 PURPOSE

To view data collected while running an AutoTest and/or to view and edit File AutoTest definition files.

See Section 3.3.10, PRINCIPLE for information on the AutoTest function.

 OPERATION

To access the ATest menu select [SETUP], <5ATest>. The display is:

Select <1data> to view AutoTest results data (see Section 3.4.5.1).

Select <2file> to view or edit an AutoTest definition file (see Section 3.4.5.2).

AutoTest: 1data 2file

3.4.5.1 DATA

 PURPOSE

To view the data files that are created when an AutoTest is run.  PRINCIPLE RPM4 supports AutoTest automated tests (see Section 3.3.10). When an

AutoTest is run, the RPM4 pressure measurement accepted by the operator at each point is logged. The logged pressure measurements and an identifying header are stored in a data file. The data file can be viewed immediately following the last point of the sequence by selecting <1data>. In addition, the last ten data files recorded can be viewed anytime by selecting [SETUP],

<5ATest>, <1data>. Data File Protocol

Up to ten data files are buffered, ten at a time, in RPM4 memory. When a new AutoTest run is completed, its data file goes to the back of the queue and the oldest data file is deleted.

Data files are identified by a header whose first line is the full scale of the DUT and the number of test points in the AutoTest. The second line is the date (YYYYMMDD) and time (HH:MM:SS) at which the last point of the sequence was accepted.

Following the data file header, each test point is recorded including the pressure reading of the RPM4 with head, AutoZ and range status as well as an indication of whether the reading was out of tolerance and the test point number over the total number of test points in the Sequence.

 OPERATION To access the AutoTest results data file viewing function press [SETUP],

<5ATest>, <1data>. The first display is the data file header which can be used to toggle through

data files:

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

1. Full scale of the AutoTest with pressure unit of measure and measurement mode.

2. Number of test points executed/total number of points in the AutoTest.

3. Date and time that the last point in the AutoTest was executed.

Press [+/-] or [→] to scroll through the headers of the other AutoTest data files available. RPM4 stores up to ten AutoTest data files in order of execution with a new data file pushing all the files back and deleting the oldest one. When the header of the AutoTest data file you would like to view appears, press [ENT] to view the first point of the identified AutoTest data file.

The display is:

1. RPM4 reading logged for the test point.

2. Head, AutoZ and Q-RPT indicator (same as in the RPM4 main run screen) (see Section

3.1.1).

3. Indication that this is an AutoTest data file view screen.

4. <FA> indicating that the AutoTest was a File AutoTest or <QA> indicating a Quick AutoTest. This is preceded by <OT> if the test point was out of tolerance (definition of out of tolerance is Set point – RPM4 reading > DUT tolerance).

5. Number of this test point over total number of points in the AutoTest.

6000 psig 6/6 20050922 10:51:01 am

0.00 psig hzHi View data FA 1/10

Press [ENT] to move to the next data point. Press [←] or [→] to scroll backward and forward through the test points. The data file header is between the first point and the last point.

Press [ESC] to exit the data file. Confirmation is required to exit the data view function.

Up to ten data files are buffered, ten at a time, in RPM4 memory. When a new AutoTest run is completed, its data file goes to front of the queue and the oldest data file is deleted.

3.4.5.2 FILE

 PURPOSE

To view and edit File AutoTest definition files.  PRINCIPLE RPM4 supports AutoTests (see Section 3.3.10,  PRINCIPLE). There are two

types of AutoTests:

• Quick AutoTests in which the DUT and test parameters are entered “on the

fly” during the initialization of the test.

• File AutoTests in which the DUT and test parameters are stored in a file and

retrieved when the file is selected to run an AutoTest.

File AutoTest parameters are stored in definition files. [SETUP], <5AutoTest>, <2file> allows File AutoTest definition files to be viewed and edited. Up to 40 File AutoTest definition files with up to 21 test points in each file can be created.

3. OPERATION

A File AutoTest definition file defines:

• The identifying number of the File AutoTest definition file.

• Pressure measurement mode (gauge or absolute).

• Pressure unit of measure.

• DUT full scale in pressure unit of measure and measurement mode.

• DUT tolerance (% FS).

• Number of test points or pressure targets to include in the AutoTest.

• Numerical value of each test point or pressure target.

See Section 3.3.10,  OPERATION for information on running a Quick or File AutoTest.

See Section 3.4.5.1 for information on viewing the data files that result from running a Sequence.

See Section 3.3.10, OPERATION, for information on RUNNING a Quick or File AutoTest.

 OPERATION

To access the AutoTest definition viewing and editing functions press [SETUP],

<5ATest>, <2file>. Select <1view> to view an AutoTest definition file. Select <2edit> to edit an AutoTest definition file.

When <2edit> is selected the display is:

Edit File AutoTest # 1

Enter the number (1 - 40) of the File AutoTest to be edited.

To create a File AutoTest definition file similar to an existing definition file without entering all the definition information, edit an existing definition file and at the end of the editing process, save it as a different file number.

The display is:

Measurement mode: 1absolute 2gauge

The cursor is on the current selection. Select the desired pressure measurement mode for the AutoTest (see Section 3.3.3).

The display is:

1psi 2MPa 3kPa 4bar

The unit of measure selection screen is the current [UNIT] selection screen (see Section 3.3.2). Select the desired pressure measurement unit for the AutoTest.

The display is:

DUT full scale: 6000 psi g File1

Enter the full scale pressure of the DUT to be calibrated with this File AutoTest. The value entered will be used along with the DUT tolerance to AutoRange RPM4 settings when the File AutoTest is run (see Section 3.3.10,  PRINCIPLE).

The display is:

DUT tolerance:

0.25% FS File1

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

Enter the tolerance in % of full scale (measurement uncertainty, precision or accuracy as desired) of the DUT to be calibrated using this File AutoTest. The value entered will be used along with the DUT full scale to determine RPM4 AutoRange settings when the AutoTest is run (see Section 3.3.10,  PRINCIPLE).

The display is:

Enter the total number of pressure points or target pressures to be included in the AutoTest. The maximum number of points is 21. If data is to be taken at “zero” pressure, include the “zero” points in the point count.

The display is: Enter the numerical value of the target pressure point <N>. Repeat until all of the

points in the File AutoTest have been defined. After entering the last pressure target, the

display is: Enter the identifying number under which this File AutoTest definition file should

be saved. A confirmation is required to overwrite and existing sequence. While editing a File AutoTest, pressing [ESC] backs through entries until editing

of the pressure target values has begun. Then [ESC] can only be used to abandon editing.

3.5 [SPECIAL]

 PURPOSE

Number of targets: 1 File1

Pressure target N:

0.00 psi g File1

Save as File AutoTest #:1

[SPECIAL] accesses a menu of RPM4 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:

4SDS 5prefs 6Punit 7intern 8cal 9reset

Some screens, such as the SPECIAL menu, 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.

SPECIAL menu choices include:

<1AutoZ> Manage the AutoZero function for the active Q-RPT (see Section 3.5.1). <2remote> View and edit COM port (RS-232) and IEEE-488 interface settings. Select remote syntax

style (see Section 3.5.2).

<3head> Set HEAD function fluid and height unit of measure (see Section 3.5.3). <4SDS> Feature not used in this RPM4 model. <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 the [UNIT] key pressure unit of measure selections (See section 3.5.6).

3. OPERATION

<7intern> Access internal functions including on-board barometer viewing, read rate adjustment, incid ent

log viewing (see Section 3.5.7).

<8cal> View and adjust RPM4 Q-RPT and barometer calibration coefficients (see Sections 3. 5.8, 5.2, 5.3). <9reset> Access RPM4’s various reset functions (see Se ct ion 3.5.9).

3.5.1 <1AUTOZ>

 PURPOSE

To turn ON and OFF the AutoZ function that offsets the RPM4 Q-RPT readings relative to a reference value in order to compensate for possible Q-RPT zero drift between full recalibrations. To view and adjust the value of the AutoZ offset.

To RUN the AutoZ routine that rezeroes the Q-RPT, use [AutoZ] (see Section 3.3.9).

 PRINCIPLE AutoZ Purpose and Principle

The main component of the change over time of the RPM4 Q-RPTs is change in zero or offset, independent of span. Offsetting or “rezeroing” RPM4 Q-RPTs relative to a reference between recalibrations allows measurement uncertainty specifications to be maintained with less frequent full calibrations. The RPM4 AutoZero function (AutoZ) provides full on-board support for the rezeroing process to simplify its regular 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 th e

std,0

reference relative to which to off set the RPM4 Q-RP T. In absolute measurement mode, the pressure at which AutoZ is performed is normally

atmospheric pressure and the P

value can be supplied a) by manual entry, b)

std,0

automatically from a DHI RPMx connected to RPM4’s COM2 communications port, or c) automatically from the Lo Q -RPT for t he Hi 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 atm osphere.

2. P

: The pressure reading of the Q-RPT, with no AutoZ offset, at the time AutoZ is

u,0

performed.

3. P

offset

std,0

and P

offset,G

) and the AutoZ standard (P

u,0

represents the difference between the Q-RPT reading (P

: The difference between the reading of the Q-RPT with no AutoZ offset

offset,A

) for gauge (G) and absolute(A) measurement mode:

std,0

offset

= P

u,0

- P

std,0

) and the AutoZ standard

u,0

). The AutoZ function manages the determination, storage and application of P

offset

correct the zero offset in absolute and gauge 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 zero drift. The AutoZ function can be turned ON and OFF. Table 5 summarizes the effect of AutoZ ON

and OFF in absolute and gauge measurement modes.

AutoZ in absolute measurement mode

The RPM4 A70M/A20M-AF Q-RPTs are intrinsically absolute. They have an evacuated and sealed reference and naturally measure absolute pressure (difference from vacuum).

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

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

being AutoZeroed. Given the high pressure range of the RPM4 Q-RPTs, adequate uncertainty is easily available from a variety of digital barometers or, for the Hi Q-RPT, by the Lo Q-RPT.

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 3.3.9.1).

offset,A

AutoZ in gauge measurement mode, dynamic compensation for atmospheric pressure

The RPM4 A70M/A20M-AF Q-RPTs are intrinsically absolute but they are also used in gauge measurement mode (difference from atmosphere). 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,  PRINCIPLE).

In gauge measurement mode, the value of P

is always zero gauge pressure. Zero gauge

std,0

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

, minus P

offset,G

When AutoZ is ON, dynamic compensation for atmospheric pressure is also applied to compensate for changes in atmosph eric pressure as measured by RPM4’s o n-board barometer

) between AutoZ updates (see Section 3.2.2). The measured gauge pressure is

(ΔP

atm

calculated using ΔP

to correct the value of P

atm

= Pu - P

gauge

offset.G

- ΔP

atm

In gauge measurement mode, running AutoZ is initiated by the operator pressing [AutoZ] (see Section 3.3.9.1) when the RPM4 is vented. This assures regular updating of the value

offset,G

and P

of P

When gauge mode is first activated, the value of P

atm,0

. ΔP

is continuously updated automatically.

atm

offset.G

subtracted 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 vent the RPM4 Q-RPT and press [AutoZ] to run AutoZ and obtain an actual value of P

offset.G

AutoZ ON/OFF

The AutoZ function can be turned ON and OFF separately for gauge and absolute measurement modes. Table 5 summarizes the effect of AutoZ ON and OFF. Generally, AutoZ should always be left ON.

Table 5. AutoZ ON and OFF

MEASUREMENT

MODE

Absolute

Gauge

AutoZ

STATUS

ON YES

OFF NO

ON YES

OFF

offset

APPLIED

YES

ΔP

atm

APPLIED

Not Applicable

AutoZ

ROUTINE

RUNS

When initiated

by operator

Not available

When initiated

by operator

3. OPERATION

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 Q-RPTs and maximizing the recalibration interval by compensating for zero drift between full recalibrations. The following simple recommendations will help assure that you use this feature to best advantage.

• In gauge mode: Always leave AutoZ ON. Use [AutoZ] to run AutoZ whenever RPM4 is

vented and displays a significantly non-zero value. Wait at least 2 minutes after venting before running AutoZ.

• In absolute measurement mode: Always leave AutoZ ON. Use [AutoZ] to run AutoZ every

approximately every 30 days or when RPM4 has been exposed to a temperature change exceeding 15 ºC (36 ºF). AutoZero the Lo Q-RPT against a barometer with measurement uncertainty of ± 0.04 psi (275 Pa) or better (note that this is only 0.3% of atmospheric pressure so a relatively low accuracy barometer is adequate). AutoZero the Hi Q-RPT against the Lo QRPT. Wait 5 to 10 minutes before running AutoZero in absolute mode.

The AutoZ function and values are Q-RPT AND measurement mode (gauge or absolute)

specific.

 OPERATION

To RUN the AutoZ routine that rezeroes the Q-RPT, use [AutoZ] (see Section 3.3.9).

To access the RPM4 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).

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, third character from the

right. When AutoZ is OFF, the character is blank.

Select <2view> to view the current value of P

calibrated. P

should be zero in absolute measurement mode when the RPM4 is new or has just been

offset

should be roughly equal to atmospheric pressure when the Q-RPT is in gauge

offset

for the active Q-RPT and measurement mode.

offset

measurement mode.

Select <3edit> to edit the value of P (see Section 3.5.1.1).

The value of P

is always displayed and entered in Pascal (Pa).

offset

for the active Q-RPT and measurement mode

offset

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

3.5.1.1 EDIT AUTOZ

The edit AutoZ function should be used only with great care as entering inappropriate values may result in out of tolerance measurements. In normal operation, the value of the AutoZ offset, P using [AutoZ] (seen Section 3.3.9). PRINCIPLE.

To edit the current P

value for the active Q-RPT and measurement mode,

offset

press [SPECIAL], <1AutoZ>, <3edit>. The display is:

offset

Before editing P

, should be changed by running AutoZ

, see Section 3.5.1, 

offset

1. Indication of active measurement mode (<abs> for absolute, <gage> for gauge).

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 viewed.

offset

Poffset, Abs Hi 275 Pa

abandon changes.

The value of P

is always displayed and entered in Pascal (Pa).

offset

3.5.2 <2REMOTE>

 PURPOSE

To configure the RPM4 COM1, COM2 and IEEE-488 (GPIB) communication ports. To test COM1 and COM2 communications. To select the remote programming communications format.

 PRINCIPLE

The RPM4 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, etc.). These ports’ settings can be viewed and changed using [SPECIAL], <2remote>.

RPM4 has two remote communications formats, classic and enhanced (see Section 4.3). Th e active format can be selected.

A self test is supplied for RS-232 communications. The self test allows verification that the RPM4 RS232 ports (COM1 and COM2) are operating properly and that a valid interface cable is being used.

 OPERATION

To access the communications settings, press [SPECIAL], <2Remote>.

• Select <1COM1> to view and edit COM1 settings (see Section 3.5.2.1.).

• Select <2COM2> to view and edit COM2 settings (see Section 3.5.2.1.).

• Select <3IEEE> to view and edit IEEE-488 settings (see Section 3.5.2.2).

• Select <4format> to select the remote communications command format (see Section 3.5.2.3).

• Select <5RS232test> to run the COM1 and COM2 communications test (see Section 3.5.2.4).

3. OPERATION

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, referred to as

“Term1” and “Term2”, as well as define these characters. These define the characters that mark the end of commands that are sent to the RPM4 as well as mark the end of replies sent back to the host computer. The RPM4 typically uses the <Term1> character to mark the end, and will ignore the <Term2> character. The characters can be any decimal number from 1 to 255. The defaults are <13> (carriage return) and <10> (line feed) and usually should not be changed.

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 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 inte rface wi ll reset (PON) and becom e idle.

3.5.2.3 <4FORMAT>

The RPM4 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], <2remote>, <4format> allows the remote program command syntax to

be selected. The cursor is on the active format. Select <1classic> or <2enhanced> as desired.

3.5.2.4 <5RS232 SELF-TEST>

The RS232 self-test is provided to check the RPM4 COM ports and the interface cable independently of an external device or computer.

If you are having difficulty communicating with RPM4 from a host computer using RS232, the RS232 self test can help establish that the RPM4 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>.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

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).

Once the cable has been installed, press [ENT] to run the self-test. The test is first executed in the COM1→COM2 di rection and th en 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 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 and

therefore cannot communicate together (see Section 3.5.2.1 to set 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 fluid type and species for density calculations.

 OPERATION

From the MAIN RUN screen, press [SPECIAL], <3Head>. Select the desired height unit of measure and press [ENT]. Select <1gas> or <2liqud> depending on the pressurized medium between the RPM4 and

the height at which pressure is to be calculated. Select the gas or liquid species. The liquid selection <3User>, is to create a custom liquid with a user entered density.

Use [HEAD] to set a head height if desired.

3.5.4 <4SDS>

 PURPOSE

This feature is not used in RPM4 A70M/A20M-AF.

3.5.5 <5PREFS>

 PURPOSE

To access a menu of RPM4 operational preferences and functions.

 OPERATION

3. OPERATION

To access the PREFS menu press [SPECIAL], <5prefs>. The display is:

1ScrSvr 2sound 3time 4ID 5level

The PREFS menu includes:

<1ScrSvr> View and change the screen saver activation time (see Section 3.5.5.1). <2sound> View and change the key press sounds (see Section 3.5.5.2). <3time> View and edit the internal time and date settings (see Section 3.5.5.3). <4ID> View the RPM4 serial number (SN) and view or edit the ID number

(see Section 3.5.5.4).

<4level> View and set the 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 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 t he SCREEN SAVER function.

3.5.5.2 <2SOUND>

 PURPOSE

To adjust or suppress the RPM4 valid key press sound.

See Section 3.1.4 for information on the complete list of sounds made by

RPM4 and their meanings.

 PRINCIPLE

RPM4 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.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

The sound function only affects the valid key press tone. The invalid key press

tone and other RPM4 sounds cannot be adjusted or suppressed.

3.5.5.3 <3TIME>

 PURPOSE

To view and edit the RPM4 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 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 user ID and to view the RPM4 serial number.

 OPERATION

To access the ID function press [SPECIAL], <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).

3. OPERATION

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 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 is being used, it may be desirable to restrict access to some functions. The user level function pr ovides a means of restrictin g ac ce s s to c er ta i n 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 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 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).

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

The security levels are structured to support typical levels of operation as shown in Table 6. Specifically, the security levels prevent execution of the functions accessed by the key strokes marked by “•”:

Table 6. Security levels

FUNCTION LOW MEDIUM HIGH

[RANGE] [ENT] (AutoTest) [UNIT] [MODE] [AutoRange] [LEAK CK] [DISPLAY] [HEAD] [SDS] (NOT USED IN THIS RPM4 MODEL) [AutoZ] (in absolute mode) [SETUP] [SETUP], <1range> [SETUP], <2res> [SETUP], <4UL> [SETUP], <5ATest> [SPECIAL] [SPECIAL], <1AutoZ> [SPECIAL], <1AutoZ>, <1on/1off> [SPECIAL], <1AutoZ>, <3edit> [SPECIAL], <2remote> [SPECIAL], <2remote>, make changes [SPECIAL], <3head> [SPECIAL], <4SDS> (NOT USED IN THIS RPM4 MODEL) [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> (NOT USED)) [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.

•

• •

•

• •

•

• •

•

• •

•

• •

• • •

•

• •

• • •

• •

• • •

• •

• • •

• •

• • •

•

3. OPERATION

 OPERATION

RPM4 is delivered with no active password and access to the User Level menu is open. The use r le vel is set t o <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 password entry screen appears. The user must enter the user defined password or the factory secondary

RPM4 SNnnnn-xx Password: pppppp

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 23). 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 selection of pressure units of measure that are available in the [UNIT] key menu.

 PRINCIPLE

The [UNIT] function key makes available a choice of four default pressure units (psi, MPa, kPa, bar) (see Section 3.3.2). RPM4 also supports many commonly used units other than those included in the default set up. These units can be made available for active selection by customizing the UNIT function using [SPECIAL], <6PresU>. This allows RPM4 to offer a very wide selection of units while simplifying day to day operation. The typical user

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

customizes the [UNIT] function key to support his/her most commonly used units. Up to six units can be included in the [UNIT] screen.

 OPERATION

To customize the [UNIT] function key, press [SPECIAL], <6PresU> from the MAIN RUN screen. The display is:

1. Entry field to specify which unit position (1 to 6) of the [UNIT] function key menu is to be changed.

Enter the number of the unit position that you would like to change. The display becomes:

Set up unit #6

Unit#6 1SI 2other 3altitude 4user

Select the desired pressure unit category (SI units include units based on SI units such as mmHg), then select the desired unit from the unit menu. Note: <3altitude> is not available in this RPM4 model.

The units of measure available are listed in Table 7.

Table 7. UNIT function - available units of measure

<1SI> <2OTHER> <3ALTITUDE

<1Pa> <2hPa> <3kPa>

<4MPa>

<5mbar>

<6bar> <7mmHg> <8mmWa>

<1psi>

<2psf>

<3inHg> <4inWa> <5kcm2>

Not available in this RPM4

model

<4USER>

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 7.1.1 for the pressure unit conversion factors used by RPM4.

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:

1baro 2ReadRt 3RPT2x 4lo vnt 5log

3. OPERATION

The INTERNAL menu choices include: <1baro> View the real time output of the RPM4 on-board barometer (see Section

3.5.7.1).

<2ReadRt> Turn ON and OFF RPM4’s automated, rate of change dependent, reading

and integration and display rate feature (see Section 3.5.7.2).

<3RPT2x> Feature not used in this RPM4 model. <4lo vnt> Feature not used in this RPM4 model. <5log> View the RPM4 incident log (see Section 3.5.7.5).

3.5.7.1 <1BARO>

 PURPOSE

To view the value of atmospheric pressure as measured by the RPM4 on-board barometer.

 PRINCIPLE

RPM4 A70M/A20M-AF is equipped with an on-board barometer. The atmospheric pressure measurements made by the on-board barometer are used for dynamic compensatio n o f a t mos p h er ic pressure w hen making gauge pressure measurements (see Sections 3.2.2, 3.3.3,  PRINCIPLE).

See Section 5.4,4 Figure 13 and Section 5.4.5, Figure 14 for a photo and

schematics showing the position of the on-board barometer in RPM4.

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 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 0.1 Pa, or its equivalent.

3.5.7.2 <2READRT>

 PURPOSE

To turn ON and OFF RPM4’s automated, rate of change dependent, reading integration and display rate feature.

 PRINCIPLE

To obtain maximum resolution from RPM4 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 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.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

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 8. 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

DISPLAY

UPDATE

≈ 0.2 s ≈ 0.6 s ≈ 1.2 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 OFF. In this case, the reading rate is always the high resolution rate of about 1.2 readings per second.

 OPERATION

To turn the automated read rate function ON or OFF or check its current status, press [SPECIAL], <7internal>, <3ReadRt>.

The display is:

Auto read rate: H3 1on 2off

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.

The default RPM4 condition is auto read rate ON.

Auto read rate ON/OFF is NOT Q-RPT or range specific. Turning auto read rate ON or OFF in one range turns it ON or OFF for all RPM4 ranges.

3.5.7.3 <3RPT2X>

 PURPOSE

This feature is not used in this RPM4 model.

3.5.7.4 <4LO VNT>

 PURPOSE

This feature is not used in this RPM4 model.

3.5.7.5 <5LOG>

 PURPOSE

To view and/or clear the RPM4 event log.

 PRINCIPLE

RPM4 records to a log each time one of the following events occurs:

• Pmax! of an internal RPM4 Q-RPT is exceeded (see Section 3.4.4.1).

• A memory fault occurs.

3. OPERATION

 OPERATION

To view the event log press [SPECIAL], <7internal>, <5log>. The oldest logged event appears. Pressing [ENT] steps through the logged events from the oldest to the most recent and ending with the option to clear the log, <1no>, <2yes>. The log clear choice is not available in all security levels (see Section 3.5.5.5, Table 6).

When all events have been viewed, <End of log> displays.

3.5.8 <8CAL>

 PURPOSE

To calibrate the RPM4 Hi and Lo Q-RPTs and adjust the on-board barometer. These functions are considered part of RPM4 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 settings to default or factory values.

 PRINCIPLE

RPM4 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 to a known state. RPM4 goes through its power up sequence after any type of reset is executed.

RPM4 reset functions will change current settings to factory defaults. These may include settings vital to RPM4 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> to reset unit of measure functions (see Section 3.5.9.2). <3ATest> to reset AutoTest parameters, clear File AutoTest files and clear the AutoTest data

log (see Section 3.5.9.3).

<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).

3.5.9.1 <1SETS>

 PURPOSE

Sets most general operating parameters back to default values. Does not affect calibration coefficients, remote interfaces or AutoRan ge ranges. The Reset – Sets resets are itemized in Table 9.

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

Table 9. Reset – Sets

RESET RESULT SEE SECTION

[UNIT] Pressure unit of measure to first of the six available (psi) 3.3.2 [MODE] Measurement mode to the native mode of the Q-RPT (absolute) 3.3.3 [RANGE] Hi Q-RPT default range (10000 psi) 3.3.1 [HEAD] 0 cm height and Nitrogen medium 3.3.7

Stability Limit 0.005 % of Hi Q-RPT default range 3.4.3 Upper Limit Hi Q-RPT default range default value 3.4.4 Resolution 0.001 % FS of Hi Q-RPT default range 3.4.2 AutoZ AutoZ ON for both Q-RPTs and gauge and asbsolute

AutoZ P 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 Automatic 3.5.7.4 ReadRate Automatic 3.5.7.2

measurement modes. Z

set to 101.325 kPa a 3.5.1, 3.2.2

atm,0

value not affected

offset

3.5.1

3.5.9.2 <2 UNITS>

 PURPOSE

Sets the pressure units available under the UNIT function to default selections depending (see Section 3.3.2).

Sets the user defined unit to 1.000/Pa (see Section 3.5.6). Sets the reference temperature for inWa unit to 20°C.

3.5.9.3 <3ATEST>

 PURPOSE

• Resets Auto Tests to default characteristics (see Section 3.3.10).

• Clears File AutoTest definition files (see Section 3.4.5.2).

• Clears AutoTest results data logs (see Section 3.4.5.1).

3. OPERATION

3.5.9.4 <4 CAL>

The Reset - Cal function will reset the Q-RPT and barometer calibration coefficients and reset AutoZ values to zero. This will change the RPM4 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 10.

Table 10. Reset – Cal

RESET RESULT SEE SECTION

All Q-RPT calibration coefficients

Q-RPT absolute mode ON 5.3.5 On-board barometer

calibration coefficients Calibration date Set all dates to 19800101 5.3.7 AutoZ values All P

AutoZ function ON, all Q-RPT s, all measurement modes 3.5.1

PA to zero, PM to 1 5.3.1

PA to zero, PM to 1 5.2.2

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 to the “as delivered” condition. The Reset – All resets are itemized in Table 11.

Table 11. 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 3.5.9.3 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 Parallel Measurement Mode Off 3.5.7.3

3.5.2

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

OOTTEES

4. REMOTE OPERATION

44.

EEMMOOTTEE

PPEERRAATTIIOON

4.1 OVERVIEW

Most of the RPM4 front panel functions can also be executed by commands from a remote computer. The host computer can communicate to the RPM4 usi ng the RPM4’s COM1 RS232 port or it’s IEEE-488 port.

Before writing code using RPM4 remote commands, familiarize yourself with its operating principles by reviewing Section 3 of this manual.

4.2 INTERFACING

Sending a program message to the RPM4 places it into remote mode. The remote indicator to the right of the display window lights when the RPM4 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 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 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-to-pin 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 to reply from the previous command before issuing another command.

Table 12. COM1 pin designations and connections

RPM4 COM1 DB-9F PIN DESIGNATIONS

PIN # FUNCTION DESCRIPTION

2 TxD This pin transmits serial data from the RPM4 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 DB9F

CONNECTION

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

4.2.1.2 IEEE-488

The RPM4 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 IEEE-488 interface while using the COM1 interface. The IEEE-488 receive buffer is 250 bytes deep. If you attempt to overflow the buffer, the RPM4 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 COM2 RS232 interface is located on the back of the unit. It can be used to allow the host computer to communicate with another d evice through the RPM4. This allows the user to use o ne host COM port to commun icate with the RP M4 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 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 13. COM2 DB-9F pin designations

PIN # FUNCTION DESCRIPTION

2 RxD This pin transmits serial data from the RPM4 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 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 “?” must be included in an enhanced command to yield a reply from the RPM4. When using the COM1 port in classic or enhanced mode or using the IEEE-488 port in class ic mode, every command has a reply which the host must wa it for before continuing. In add ition, the enhanced message format suppor ts IEEE Std 488.2 syntax, format and status reporting. The default is the classic format.

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 classic and enhanced commands are common with DHI 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 at time. After sending any program message, you must wait for the RPM4 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. This insures that the RPM4 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. “RPT”, “ARANGE”, “AUTOZERO=RUN”: Up to 3 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. 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 in the form of comma delimited arguments. This data is usually a setting of some sort that is stored in the RPM4. 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.

If you are using the IEEE-488 port, the Command type does not generate a reply 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/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

Examples:

• IEEE-488 enhanced mode command series using query operator:

“*CLS?” (Clear the e rror queue. Wait for reply) “UNIT? KPA” (Generates a reply. User must wait for reply before continuing) “MMODE? A” (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) “UNIT KPA” (No reply) “MMODE A” (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) “UNIT KPA;MMODE A” (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. 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 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”, “ARANGE”, “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 in enhanced mode via the IEEE-488 port that results in an error will not result in a reply. You must check the error queue (use the “ERR” querie) to see if an error has occurred.

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. In most cases, each Q-RPT in the R PM4 operates as a n independent meas urement device. If the suffix is not specified, then the “Active” Q-RPT is assumed. The “RANGE” or “ARANGE” command can be used to select the “Active” Q-RPT. See the program message descriptions for suffix use with a specific command.

Table 14. Program message list

COMMAND

‘n’ indicates an

optional suffix

# Send a command string out of the RPM4 COM2 port. ABORT Stop pending operations ARANGEn Read or set a new AutoRange to use. ATM Read the current atmospheric pressure (on-board barometer). AUTOZEROn Read or set the status of the AutoZ automatic zeroing function. AUTOZEROn=RUN Run AutoZero. CALAMB Read or set the on-board barometer calibration COM1 Read or set the configuration of the COM1 port. COM2 Read or set the configuration of the COM2 port. CONTn Enable continuous measurements DATE Read or set the current date. ERR Read the last error message. GPIB Read or set the GPIB interface address. HEAD Read or set the fluid head settings. ID Read or set the RPM4 alphanumeric asset ID tag. L2 Selects “classic” program message format L3 Selects “enhanced” program message format LOCAL Return control to the RPM4 front panel. MEM Read the power-up memory test status. MMODEn Read or change the active measurement mode. MSGFMT Read or set the type of program message format to use. PCALn Read or set the user Lo Q-RPT calibration information. PCAL:XX Read or set the user Lo Q-RPT calibration information (old command). PRn Read the next RPM4 pressure. PRRn Read the next RPM4 pressure, rate, and ATM. QPRRn Read the last RPM4 pressure, rate and ATM. RANGE Select a Q-RPT to be “active” in it’s default full scale range RATEn Read the next available rate of change of pressure. READRATEn Read or set the Q-RPT measurement read rate and mode READYCKn Read or set a flag that is cleared by a Not Ready condition. REMOTE Enable remote local lockout operation. RESn Read or set the pressure display resolution for the current transducer and range. RESET Reset the RPM4 to default user parameters. RPTn Read the available Q-RPT data. SCRSAV Read or set the front panel screen saver period. SN Read the serial number of the RPM4. SRn Read the next available pressure status (Ready/Not Ready). SSn Read or set the stability required for a Ready condition. SS%n Read or set the stability required for a Ready condition (% span/ s). TIME Read or set the current time of day. UCOEFn Convert a pressure in Pascal to pressure in the current units. UDU Read or set the user defined pressure unit. ULn Read or set the upper limit for the current range. UNITn Read or set the pressure unit of measure for the current range. VER Read the RPM4 software version. ZOFFSETn Read or set the AutoZero Z ZOFFSET:XX Read or set the AutoZ Z

offset

DESCRIPTION

for the specified Q-RPT.

offset

for the specified Q-RPT (old command).

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

4.4.2 ERROR MESSAGESS

Table 15. 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”

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 or to execute

an RPM4 function. The RPM4 must be set to use the enhanced format (see Section

3.5.2.3) to use the syntax and style shown. It may be sent alone, or followed by at least one white space and additional argument(s) to show that arguments can be passed. If there are multiple arguments, then commas must separate them. If you are using the IEEE488 port, multip le com mand type program messages can be sent in one message if you separate them with a semicolon. There will be no reply from the RPM4 using the IEEE488 port unless the command is immediately followed by the query operator “?”. If you are using the COM1 port, the PPC1 will reply and you must wait for this reply. If this field is not listed in the program message descripti on, then the Command type is not sup ported when using the Enhanced format.

Quer y This is the Enhanced program message syntax to request data from the RPM4. The RPM4

must be set to use the enhanced format (see Section 3.5.2.3). The RPM4 will always reply to a query. You must wait for this reply before issuing another program me ssage. If this field (Query) is not listed in the program message description, then the Query type for the program message is not supported when using the Enhanced format.

Classic This is the Classic program message syntax to send data to the RPM4, to execute an

RPM4 function, or to query for data. The RPM4 must be set to use the classic format (see Section 3.5.2.3). The command may be followed by a ‘(=)’ and additional argument characters to show that argument(s) can be passed. If there are multiple arguments, then commas must separate them. The RPM4 will always reply to a Classic program message. You must wait for this reply before issuing another program message. If this field is not listed in the program message description, then it is not supported when using the classic format.

Suff ix Some commands support an optional suffix. This suffix is used to specify a Q-RPT to which

the command applies, since many settings are Q-RPT spe cific: Suffix of ‘1’ for Hi Q-RPT acce ss Suffix of ‘2’ for Lo Q-RPT acce ss Suffix of ‘3’ for HL Q-RPT access. If an optional suffix is allowed but not given, then the “Active Q-RPT” will be addressed. The “Active Q-RPT” is the Q-RPT that is currently displayed on the top line of the front panel of the RPM4, and is identified by the text label in the upper right of the pressure display screen. The last Q-RPT ranged or selected using the “RANGE” or “ARANGE” commands is the “Active” QRPT. The “ARANGE”, “RANGE” or “RPT” command query can be used to determine which Q-RPT is currently active. With the Hi Q-RPT In differential mode of operation, there are some limitations on access to the Lo Q-RPT, and with the HL Q-RPT there are limitations on access to both the Hi and the Lo Q-RPTs independently.

Argu me nt s If the program message can be used to set data inside the RPM4, then this section describes

the arguments and their limits.

Default If the program message can be used to set data inside the RPM4, then this line shows

(using the enhanced format) the default setting from the factory. Remarks This field has the details and remarks about the command. Example Examples are given for the enhanced and classic methods.

Enhanced: An example of the use of an enhanced format program message to be

sent to the RPM4 is shown. The message sent to the RPM4 app ears after the “Cmd sent:” label. If only a Query type exists, the “Query sent:” label is shown instead. Directly under this label, “Query reply” shows a typical reply to a query type. “Reply:” shows that a query format does not exist. It may have a short description next to it.

Classic: An example of the use of a classic program message to be sent to the

RPM4 is shown. The command sent to the RPM4 appears after the

“Cmd sent:” label. The “Reply” label shows a typical reply to the “Sent” example. It may have a short description next to it.

Errors If the program message can report an argument error, the types of errors are listed.

If using the classic format or the COM1 port, the error message is replied after rec eiving

the program message. If using the enhanced format via the IEEE-488 port, the error

condition is handled by the status reporting model which stores the errors in an Error

Queue and can be programmed to assert the IEEE-488 SRQ line to signal an erro r has

occurred. In either case, the “ERR” or “ERR?” program message can be used to

retrieve a text description of the error. See Also Indicates related commands (“----“) and refers to manual sections giving detail on RPM4

operation corresponding to the program message.

Each program message description is separated into the following sections:

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL

4.4.4 PROGRAM MESSAGE DESCRIPTIONS

Purpose To allow the host PC to communicate with a device connected to the RPM4 COM2 port. Classic Arguments

Remarks The RPM4 COM2 port can be used to communicate to another RS232 device (such as

Example (classic) This example assumes that a second RPM4’s COM1 port is connected to the RPM4

Fluke A20M-AF, A70M, HPMS 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

1.2.2.1 QUARTZ REFERENCE PRESSURE TRANSDUCERS (Q-RPT)

1.2.2.2 ON-BOARD BAROMETER

2. INSTALLATION

2.1 UNPACKING AND INSPECTION

2.1.1 REMOVING FROM PACKAGING

2.1.2 INSPECTING CONTENTS

2.2 PGC-10000-AF SYSTEM

2.3 SITE REQUIREMENTS

2.4 SETUP

2.4.1 PREPARING FOR OPERATION

2.4.2 RPM4/HPMS FRONT, REAR AND SIDE VIEWS

2.4.2.1 RPM4/HPMS FRONT VIEW

2.4.2.2 RPM4/HPMS REAR VIEW

2.4.2.3 RPM4/HPMS SIDE VIEW

2.4.3 RPM4 FRONT AND REAR PANELS

2.4.3.1 RPM4 FRONT PANEL

2.4.3.2 RPM4 REAR PANEL

2.4.4 POWER CONNECTION

2.4.5 FOOTSWITCH CONNECTION

2.4.6 TEST PORT CONNECTION

2.4.6.1 THE ATM PORTS OF RPM4

2.4.7 CHECK/SET SECURITY LEVEL

2.4.8 SETTING UP AUTOTEST FILES

2.5 POWER-UP AND VERIFICATION

2.5.1 SWITCH POWER ON

2.5.2 CHECK PRESSURE MEASUREMENT OPERATION

2.5.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT

2.5.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT

2.6 SHORT TERM STORAGE

2.7 LONG TERM STORAGE AND/OR PREPARATION FOR SHIPPING

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 PRESSURE READY/NOT READY

3.2.2 GAUGE MODE, DYNAMIC COMPENSATION FOR ATMOSPHERIC PRESSURE

3.2.3 MULTIPE RANGES (Q-RPTS, AUTORANGE AND INFINITE RANGING)

3.2.4 AUTOMATED TEST AND CALIBRATION SEQUENCES

3.2.5 HPMS (HIGH PRESSURE MOUNTING SYSTEM)

3.2.6 DIRECT FUNCTION KEYS SUMMARY

3.3 DIRECT FUNCTION KEYS

3.3.1 [RANGE]

3.3.2 [UNIT]

3.3.3 [MODE]

3.3.4 [AUTORANGE]

3.3.5 [LEAK CK]

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]

3.3.9 [AUTOZ]

3.3.9.1 [AUTOZ] IN GAUGE MODE

3.3.9.2 [AUTOZ] IN ABSOLUTE MODE

3.3.10 [ENT] (RUN AUTOTEST)

3.3.10.1 AUTOTEST INITIALIZATION

3.3.10.2 TEST EXECUTION

3.4 [SETUP]

3.4.1 <1RANGE>

3.4.1.1 SAVING AN AUTORANGE RANGE

3.4.1.2 DELETING AUTORANGE RANGES