DH Instruments RPM4 401929 User manual

© 2004-2007 DH Instruments, a Fluke Company
RPM4™
Reference Pressure Monitor
Operation and Maintenance Manual

© 2004-2007 DH Instruments, a Fluke Company
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.
© 2004-2007 DH Instruments, a Fluke Company All rights reserved.
Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any
form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, a
Fluke Company 4765 East Beautiful Lane, Phoenix AZ 85044-5318, USA.
DH Instruments makes sincere efforts to ensure accuracy and quality of its’ published materials; however, no warranty, expressed
or implied, is provided. DH Instruments disclaims any responsibility or liability for any direct or indirect damages resulting from the
use of the information in this manual or products described in it. Mention of any product or brand does not constitute an
endorsement by DH Instruments of that product or brand. This manual was originally composed in English and was subsequently
translated into other languages. The fidelity of the translation cannot be guaranteed. In case of conflict between the English version
and other language versions, the English version predominates.
Products described in this manual are manufactured under international patents and one or more of the following U.S. patents:
5,142,483; 5,257,640; 5,331,838; 5,445,035. Other U.S. and international patents pending.
AutoRange, AutoZ, DH Instruments,DH,DHI, CalTool, COMPASS, RPM4, QDUT, Q-RPT, RPM4 and SDS are trademarks,
registered and otherwise, of DH Instruments, a Fluke Company.
Document No. 550129a-03
050815
Printed in the USA.

TABLE OF CONTENTS
Page I © 2004-2007 DH Instruments, a Fluke Company
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OF
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ON NT TE EN NT TS S
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........................................................................................2
1.2.2.1 QUARTZ REFERENCE PRESSURE TRANSDUCER (Q-RPT) ................................................................2
1.2.2.2 ON-BOARD BAROMETER ........................................................................................................................4
1.2.3 BATTERY AND CHARGER PACK................................................................................................................5
2. INSTALLATION .................................................................. 7
2.1 UNPACKING AND INSPECTION ............................................................................................................7
2.1.1 REMOVING FROM PACKAGING..................................................................................................................7
2.1.2 INSPECTING CONTENTS.............................................................................................................................7
2.2 SITE REQUIREMENTS............................................................................................................................8
2.3 SETUP .....................................................................................................................................................8
2.3.1 PREPARING FOR OPERATION ...................................................................................................................8
2.3.2 FRONT AND REAR PANELS........................................................................................................................8
2.3.2.1 FRONT PANEL ..........................................................................................................................................8
2.3.2.2 REAR PANEL.............................................................................................................................................9
2.3.3 POWER CONNECTION.................................................................................................................................9
2.3.3.1 85 TO 264 VAC, 50/60 HZ VAC POWER ..................................................................................................9
2.3.3.2 BATTERY PACK ........................................................................................................................................9
2.3.4 REMOTE [ENT] CONNECTION (FOOTSWITCH OR OTHER SWITCH)....................................................10
2.3.5 CONNECTING TO MEASURE PRESSURE (TEST(+) AND TEST(-) PORTS)...........................................10
2.3.6 THE VENT OR ATM PORT..........................................................................................................................11
2.3.7 CHECK/SET SECURITY LEVEL .................................................................................................................11
2.3.8 TURN OFF ABSOLUTE AND NEGATIVE GAUGE MODE (AXXX RPT)....................................................12
2.3.9 SDS FULL TIME OFF ..................................................................................................................................12
2.3.10 PARALLEL MEASUREMENT MODE..........................................................................................................12
2.4 POWER-UP AND VERIFICATION.........................................................................................................12
2.4.1 SWITCH POWER ON ..................................................................................................................................12
2.4.2 CHECK PRESSURE MEASUREMENT OPERATION.................................................................................13
2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT.............................................................13
2.4.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT...................................................................13
2.5 SHORT TERM STORAGE .....................................................................................................................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
3.2 GENERAL OPERATING PRINCIPLES .................................................................................................18
3.2.1 PRESSURE READY/NOT READY ..............................................................................................................18

RPM4™ OPERATION AND MAINTENANCE MANUAL
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3.2.2 GAUGE AND NEGATIVE GAUGE MODES WITH AN AXXX (ABSOLUTE) Q-RPT, DYNAMIC
COMPENSATION FOR ATMOSPHERIC PRESSURE ...............................................................................19
3.2.3 MULTIPE RANGES (Q-RPTS, AUTORANGE AND INFINITE RANGING) .................................................20
3.2.4 PARALLEL MEASUREMENT MODE..........................................................................................................21
3.2.5 USING RPM4 WITH A PPC3 CONTROLLER/CALIBRATOR.....................................................................21
3.2.6 USE OF THE 12VDC BATTERY/CHARGER PACK ...................................................................................23
3.2.7 SDS SELF DEFENSE SYSTEM ..................................................................................................................24
3.2.8 DIRECT FUNCTION KEYS SUMMARY ......................................................................................................25
3.3 DIRECT FUNCTION KEYS....................................................................................................................25
3.3.1 [RANGE] ......................................................................................................................................................25
3.3.2 [UNIT]...........................................................................................................................................................26
3.3.3 [MODE] ........................................................................................................................................................27
3.3.3.1 DIFFERENTIAL MEASUREMENT MODE OPERATION .........................................................................29
3.3.4 [AUTORANGE] ............................................................................................................................................30
3.3.5 [LEAK CK] ...................................................................................................................................................33
3.3.6 [DISPLAY]....................................................................................................................................................34
3.3.6.1 AVG (AVERAGE) .....................................................................................................................................36
3.3.6.2 RATE........................................................................................................................................................37
3.3.6.3 DEV (DEVIATION) ...................................................................................................................................38
3.3.6.4 RPT ..........................................................................................................................................................39
3.3.6.5 HI/LO ........................................................................................................................................................40
3.3.6.6 FREEZE ...................................................................................................................................................41
3.3.6.7 CLEAN .....................................................................................................................................................41
3.3.7 [HEAD] .........................................................................................................................................................42
3.3.8 [SDS] (SELF DEFENSE SYSTEM) .............................................................................................................43
3.3.8.1 SDS IN DIFFERENTIAL AND PARALLEL MEASUREMENT MODES....................................................46
3.3.9 [AUTOZ].......................................................................................................................................................46
3.3.9.1 [AUTOZ] IN GAUGE AND NEGATIVE GAUGE MODE ...........................................................................47
3.3.9.2 [AUTOZ] IN ABSOLUTE MODE...............................................................................................................48
3.3.9.3 AUTOZ IN DIFFERENTIAL MODE ..........................................................................................................51
3.3.10 [ENT] (RUN AUTOTEST).............................................................................................................................51
3.4 [SETUP] .................................................................................................................................................52
3.4.1 <1RANGE> ..................................................................................................................................................52
3.4.1.1 SAVING AN AUTORANGE RANGE ........................................................................................................52
3.4.1.2 DELETING AUTORANGE RANGES........................................................................................................53
3.4.2 <2RES> (RESOLUTION) .............................................................................................................................53
3.4.3 <3STAB>......................................................................................................................................................54
3.4.4 <4UL> (UPPER LIMIT) ................................................................................................................................55
3.4.4.1 OVER PRESSURE FUNCTION...............................................................................................................57
3.4.5 <5ATEST>....................................................................................................................................................57
3.5 [SPECIAL] .............................................................................................................................................57
3.5.1 <1AUTOZ> ...................................................................................................................................................58
3.5.1.1 EDIT AUTOZ ............................................................................................................................................62
3.5.2 <2REMOTE> ................................................................................................................................................62
3.5.2.1 <1COM1, 2COM2>...................................................................................................................................63
3.5.2.2 <3IEEE-488>............................................................................................................................................63
3.5.2.3 <4FORMAT> ............................................................................................................................................63
3.5.2.4 <5RS232 SELF-TEST>............................................................................................................................64
3.5.3 <3HEAD> .....................................................................................................................................................64
3.5.4 <4SDS>........................................................................................................................................................65
3.5.4.1 <1TEMP OPEN/CLOSE>.........................................................................................................................65
3.5.4.2 <2FULL TIME ON/OFF> ..........................................................................................................................66
3.5.5 <5PREFS> ...................................................................................................................................................66
3.5.5.1 <1SCRSVR> ............................................................................................................................................67
3.5.5.2 <2SOUND> ..............................................................................................................................................67
3.5.5.3 <3TIME>...................................................................................................................................................67
3.5.5.4 <4ID>........................................................................................................................................................68
3.5.5.5 <5LEVEL> (SECURITY)...........................................................................................................................68
3.5.6 <6PUNIT>.....................................................................................................................................................71
3.5.7 <7INTERNAL> .............................................................................................................................................73
3.5.7.1 <1BARO> .................................................................................................................................................73
3.5.7.2 <2READRT> ............................................................................................................................................74
3.5.7.3 <3RPT2X>................................................................................................................................................75
3.5.7.4 <4LO VNT> ..............................................................................................................................................76
3.5.7.5 <5LOG>....................................................................................................................................................77
3.5.8 <8CAL> ........................................................................................................................................................77
3.5.9 <9RESET> ...................................................................................................................................................78
3.5.9.1 <1SETS>..................................................................................................................................................78
3.5.9.2 <2 UNITS> ...............................................................................................................................................79
3.5.9.3 <3ATEST>................................................................................................................................................79
3.5.9.4 <4 CAL> ...................................................................................................................................................79
3.5.9.5 <5 ALL>....................................................................................................................................................80

TABLE OF CONTENTS
Page III © 2004-2007 DH Instruments, a Fluke Company
4. REMOTE OPERATION ....................................................... 81
4.1 OVERVIEW ............................................................................................................................................81
4.2 INTERFACING.......................................................................................................................................81
4.2.1 RS232 INTERFACE .....................................................................................................................................81
4.2.1.1 COM1 .......................................................................................................................................................81
4.2.1.2 IEEE-488 ..................................................................................................................................................82
4.2.1.3 COM2 .......................................................................................................................................................82
4.3 PROGRAMMING FORMATS.................................................................................................................82
4.3.1 CLASSIC PROGRAM MESSAGE FORMAT ...............................................................................................83
4.3.2 ENHANCED PROGRAM MESSAGE FORMAT ..........................................................................................83
4.3.2.1 USING COMMAND TYPE COMMANDS .................................................................................................83
4.3.2.2 USING QUERY TYPE COMMANDS ...................................................................................................84
4.4 COMMANDS..........................................................................................................................................85
4.4.1 PROGRAMMING MESSAGES ....................................................................................................................85
4.4.2 ERROR MESSAGESS.................................................................................................................................86
4.4.3 PROGRAM MESSAGE DESCRIPTION OVERVIEW ..................................................................................87
4.4.4 PROGRAM MESSAGE DESCRIPTIONS ....................................................................................................88
4.5 STATUS REPORTING SYSTEM .........................................................................................................108
4.5.1 ERROR QUEUE.........................................................................................................................................108
4.5.2 STATUS BYTE REGISTER .......................................................................................................................108
4.5.3 STANDARD EVENT REGISTER ...............................................................................................................110
4.5.4 READY STATUS REGISTER ....................................................................................................................110
4.6 IEEE STD. 488.2 COMMON AND STATUS PROGRAM MESSAGES................................................111
4.6.1 PROGRAM MESSAGE DESCRIPTIONS ..................................................................................................112
5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION ................115
5.1 OVERVIEW ..........................................................................................................................................115
5.2 CALIBRATION OF QUARTZ REFERENCE PRESSURE TRANSDUCERS (Q-RPTS) ......................115
5.2.1 PRINCIPLE ................................................................................................................................................115
5.2.1.1 PA AND PM COEFFICIENTS ................................................................................................................116
5.2.1.2 AS RECEIVED AND AS LEFT DATA ....................................................................................................116
5.2.2 EQUIPMENT REQUIRED ..........................................................................................................................117
5.2.2.1 GAS OPERATED Q-RPTS, A10M AND LOWER ..................................................................................117
5.2.2.2 OIL OR GAS OPERATED Q-RPTS A14M AND HIGHER .....................................................................117
5.2.3 SET-UP AND PREPARATION...................................................................................................................118
5.2.4 RECOMMENDED CALIBRATION POINT SEQUENCE............................................................................119
5.2.4.1 STANDARD CLASS Q-RPTS ................................................................................................................119
5.2.4.2 PREMIUM CLASS Q-RPTS ...................................................................................................................120
5.2.5 TURNING OFF ABSOLUTE AND NEGATIVE GAUGE MEAS URE ME NT MODES FOR AXXX
(ABSOLUTE) Q-R PTS .........................................................................................................................122
5.2.6 Q-RPT CALIBRATION USING CALTOOL FOR RPTS SOFTWARE........................................................122
5.2.7 EDITING AND VIEWING Q-RPT CALIBRATION INFORMATION............................................................122
5.2.8 Q-RPT CALIBRATION/ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE.........................124
5.3 ADJUSTMENT OF ON-BOARD BAROMETER...................................................................................125
5.4 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY......................................................126
5.5 SUBASSEMBLY DESCRIPTION AND LOCATION ............................................................................127
5.5.1 MINI MICRO BOARD.................................................................................................................................127
5.5.2 POWER SUPPLY MODULE ......................................................................................................................127
5.5.3 DRIVER BOARD........................................................................................................................................128
5.5.4 ON-BOARD BAROMETER........................................................................................................................128
5.5.5 Q-RPT MODULE........................................................................................................................................128
5.5.5.1 HI Q-RPT MODULE ...............................................................................................................................128
5.5.5.2 LO Q-RPT MODULE ..............................................................................................................................128
5.5.6 DISPLAY ....................................................................................................................................................128
5.6 Q-RPT MODULE PNEUMATIC SCHEMATICS ...................................................................................129

RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page IV
6. TROUBLESHOOTING .......................................................131
7. APPENDIX ......................................................................135
7.1 REMOTE [ENT] ...................................................................................................................................135
7.2 UNIT CONVERSION............................................................................................................................136
7.2.1 PRESSURE................................................................................................................................................136
8. WARRANTY ....................................................................137
8.1 OVERVIEW ..........................................................................................................................................137
9. GLOSSARY.....................................................................139

TABLES & FIGURES
Page V © 2004-2007 DH Instruments, a Fluke Company
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Table 1. Reference Pressure Transducer (Q-RPT) Module Designations and Ranges ............................. 3
Table 2. RPM4 Packing List......................................................................................................................... 7
Table 3. Position Designators of Q-RPTs in an RPM4 System................................................................. 20
Table 4. Settings and What They Are Specific To (Range, Measurement Mode, Q-RPT, System) ......... 21
Table 5. Summary of RPM4 Function Key Operation................................................................................25
Table 6. Settings Made by AutoRange ...................................................................................................... 31
Table 7. AutoZ ON and OFF...................................................................................................................... 60
Table 8. Security Levels............................................................................................................................. 70
Table 9. UNIT Function - Available Units of Measure................................................................................ 72
Table 10. READRT - Display Update Rates .............................................................................................. 74
Table 11. Reset – Sets............................................................................................................................... 79
Table 12. Reset – Cal ................................................................................................................................ 80
Table 13. Reset – All.................................................................................................................................. 80
Table 14. COM1 Pin Designations and Connections ................................................................................81
Table 15. COM2 DB-9F Pin Designations ................................................................................................. 82
Table 16. Program Message List............................................................................................................... 85
Table 17. Error #s and Descriptions .......................................................................................................... 86
Table 18. 8 Bit Status Byte Register ........................................................................................................ 108
Table 19. 8 Bit Standard Event Register.................................................................................................. 110
Table 20. 8 Bit Ready Status Register..................................................................................................... 110
Table 21. Program Message List............................................................................................................. 111
Table 22. Calibration Point Sequence, Standard Class, Axxx and Gxxx Q-RPTs .................................. 119
Table 23. Calibration Point Sequence, Standard Class, BGxxx Q-RPTs................................................ 120
Table 24. Calibration Point Sequence, Standard Class, BA100K Q-RPT............................................... 120
Table 25. Calibration Point Sequence, Premium Class, Axxx and Gxxx Q-RPTs .................................. 121
Table 26. Calibration Point Sequence, Premium Class, BGxxx Q-RPTs................................................ 121
Table 27. Troubleshooting Guide............................................................................................................. 131
Table 28. Pressure Unit of Measure Conversion Coefficients................................................................. 136
Table 29. DHI Authorized Service Providers ........................................................................................... 137

RPM4™ OPERATION AND MAINTENANCE MANUAL
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F
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IG GU UR RE ES S
Figure 1. Front Panel ................................................................................................................................... 8
Figure 2. Rear Panel.................................................................................................................................... 9
Figure 3. MAIN RUN Screen Display Fields .............................................................................................. 16
Figure 4. Keypad Layout............................................................................................................................ 17
Figure 5. Battery Pack/Charger ................................................................................................................. 23
Figure 6. Status Register Schematic ....................................................................................................... 109
Figure 7. Internal View ............................................................................................................................. 127
Figure 8. Pneumatic/hydraulic schematics of RPM4 with Single Q-RPT Module ................................... 129
Figure 9. Pneumatic/hydraulic schematics of RPM4 with Two Q-RPT Modules..................................... 130
Figure 10. Remote [ENT] Connector Schematic ..................................................................................... 135

ABOUT THIS MANUAL
Page VII © 2004-2007 DH Instruments, a Fluke Company
A
AB
BO OU UT T T
TH
HI IS S M
MA
AN NU UA AL L
This manual is intended to provide the user with the basic information necessary to operate an RPM4
reference pressure monitor. It also includes a great deal of additional information provided to allow you to
optimize RPM4 use and take full advantage of its many features and functions.
RPM4-AD is a special air data configuration of RPM4 which has its own dedicated manual, p/n
550148. This manual is for all other configurations of RPM4. If your are using an RPM4-AD (“-AD” in
front panel configuration window) use the RPM4-AD Operation and Maintenance Manual p/n 550148.
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 6, 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 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 RPM4. THEN… when you have questions or start to
wonder about all the great features you might be missing, get into the manual!
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™ OPERATION AND MAINTENANCE MANUAL
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N
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1. INTRODUCTION
Page 1 © 2004-2007 DH Instruments, a Fluke Company
1
1. . I IN
NT TR RO OD DU UC CT TI IO ON N
1.1 PRODUCT OVERVIEW
RPM4 is a stand-alone, microprocessor driven, reference pressure monitor intended to precisely
measure gas or liquid pressure in a wide variety of pressure calibration, measurement and testing
applications. It has been designed to provide very high performance and extensive features combined
with maximum versatility and ease of use.
RPM4 uses one or two quartz reference pressure transducer (Q-RPT) modules and, in some cases a
barometer, to measure pressure.
RPM4 can be controlled locally by the operator using its front panel display and keypad or remotely by a
computer using ASCII character command strings transmitted over its standard RS232 or IEEE-488.2
interface.
RPM4 models are available in ranges from as low as - 3 to 3 kPa (0.4 psi) to as high as 280 MPa (40 000 psi)
in absolute, gauge, compound gauge and differential measurement modes.
RPM4 can be integrated into a PPC3 Pressure Controller/Calibrator System to serve the PPC3’s external
pressure measuring reference (see the PPC3 Operation and Maintenance Manual).
A special configuration of RPM4 designated RPM4-AD is available for air date (altitude and
airspeed) applications. The RPM4-AD model has its own specific manual p/n 550148.

RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 2
1.2 SPECIFICATIONS
1.2.1 GENERAL SPECIFICATIONS
Power Requirements 85 to 264 VAC, 50/60 Hz, 25 VA max consumption
and 12VDC, 1.2 A
Operating Temperature Range 15 to 35 °C
Storage Temperature Range - 20 to 70 °C
Vibration
Ventilation
Meets MIL-T-28800D
To prevent product overheating, provide proper ventilation. Allow 10 cm
(4 in.) clearance from rear panel cooling fan.
Weight 5 kg (11 lb) approx. (varies slightly with number and type of Q-RPT modules)
Dimensions 10 cm H x 22.7 cm W x 24 cm D (3.9 in. x 9.3 in. x 9.5 in.)
Microprocessors Motorola 68302, 16 MHz
Communication Ports
Fuses
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
Pressure Ranges One or two independent quartz reference pressure transducer (Q-RPT)
modules cover vacuum to 280 MPa (40 000 psi)
Operating Medium Any clean, dry, non-corrosive gas or liquid. Q-RPTs less than 7 MPa full scale,
gas only
Pressure Connections Q-RPTs up to A70M Q-RPTs > A70M
TEST(+): 1/8 in. NPT F DH500 F
TEST(-): 1/8 in. NPT F None
VENT or ATM: 10-32 UNF (VENT) 10-32 UNF (ATM)
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.
Self Defense System (SDS™) Included on all gas operated Q-RPT modules of A7M or lower. Isolates
Q-RPT module TEST(+) port and vents it to atmosphere. SDS is not included
with liquid filled Q-RPTs.
Pressure Limits Maximum Working Pressure: 104 % Q-RPT maximum
Maximum Pressure Without Damage: 125 % Q-RPT maximum
Maximum SDS Protection Pressure: 10 MPa (1 500 psi):
Without Damage: 13 MPa (2 000 psi)
CE Mark Available, must be specified
1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS
1.2.2.1 QUARTZ REFERENCE PRESSURE TRANSDUCER (Q-RPT)
RPM4 can be configured with one or two quartz reference pressure transducer (Q-RPT)
modules to measure pressure. The type (Axxx, Gxxx, BGxxx, BAxxx) and range of
the Q-RPT module(s) determines the RPM4 measurement specifications.
All Q-RPTs whose maximum pressure is over 200 kPa (30 psi) are of the absolute
pressure type (Axxx) using an evacuated, permanently sealed reference.
Axxx Q-RPTs can measure absolute, gauge and negative gauge pressure. Gauge
pressure with an Axxx Q-RPT is defined by offsetting atmospheric pressure and
applying dynamic compensation for atmospheric changes using the on-board
barometer (see Section 3.2.2). Gxxx (gauge) Q-RPTs can measure positive gauge
pressure only. BGxxx (bi-directional gauge) Q-RPTs can measure gauge and
negative gauge pressure. See Section 3.3.3 for additional information on
absolute, gauge and negative gauge measurement modes.
RPM4s configured with two Q-RPT modules have independent TEST ports and can
measure separately. Two Q-RPTs can also be used together to operate in
differential mode (see Section 3.3.3.1) and parallel mode (see Section 3.2.4).

1. INTRODUCTION
Page 3 © 2004-2007 DH Instruments, a Fluke Company
Q-RPTs of A10M and lower are available with two different performance
levels, STANDARD class and PREMIUM class. See the product label on the
RPM4 rear panel, the Q-RPT module label on the rear panel and/or the
product calibration reports to determine the class of the Q-RPT(s) installed
in RPM4.
Table 1. Reference Pressure Transducer (Q-RPT) Module Designations and Ranges
SI VERSION US VERSION
Q-RPT
DESIGNATION MAXIMUM
RANGE
[kPa]
Absolute
MAXIMUM
RANGE
[kPa]
Gauge
MAXIMUM
RANGE
[psi]
Absolute
MAXIMUM
RANGE
[psi]
Gauge
A280M-L1280 000 280 000 40 000 40 000
A200M-L1200 000 200 000 30 000 30 000
A140M-L1140 000 140 000 20 000 20 000
A100M-L1100 000 100 000 15 000 15 000
A70M170 000 70 000 10 000 10 000
A40M140 000 40 000 6 000 6 000
A20M120 000 20 000 3 000 3 000
A14M114 000 14 000 2 000 2 000
A10M110 000 10 000 1 500 1 500
A7M17 000 7 000 1 000 1 000
A3.5M13 500 3 500 500 500
A2M12 000 2 000 300 300
A1.4M11 400 1 400 200 200
A700K1700 700 100 100
A350K1350 250 50 35
A200K1200 100 30 15
A160K1160 60 23 8
A100K1110 10 16 1.5
BA100K4110 -- 16 --
G200K2-- 200 -- 30
G100K2-- 100 -- 15
G15K2-- 15 -- 2.2
BG15K3-- ±15 -- ± 2.2
1. All AXXXX RPTs support absolute, gauge and compound (negative) gauge modes.
2. All GXXXX RPTs are positive gauge mode only.
3. BG15K is bi-directional gauge from - 15 to + 15 kPa (- 2.2 to + 2.2 psi).
4. BA100K is a barometric range whose low point is 70 kPa absolute (10 psi).

RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 4
Warm Up Time 30 minute temperature stabilization recommended from
cold power up.
Resolution To 1 ppm, user adjustable
Compensated Temperature Range 5 to 35 °C
Acceleration Affect ± 0.008 % /g maximum, worst axis
Allows operation at ± 20° from reference plane without
significant effect
Predicted One Year Stability
(all classes and types)1± 0.005% of reading
Q-RPTs UP TO A10M (1500 psi)
STANDARD CLASS PREMIUM CLASS
Precision2± 0.008% of reading or
0.0024% of Q-RPT span,
whichever is greater4
± 0.005% of reading, 0.0015%
of AutoRanged span, or
0.0005% of Q-RPT span,
whichever is greater5
Measurement Uncertainty3± 0.01% of reading or 0.0030%
of Q-RPT span, whichever is
greater4
± 0.008 % of reading, 0.0024%
of AutoRanged span, or
0.0007% of Q-RPT span,
whichever is greater5
Q-RPTs A14M TO A140M (2 000 to 20 000 psi)
Precision2± 0.012% of reading or 0.0036% of Q-RPT span, whichever is
greater4
Measurement Uncertainty3± 0.013% of reading or 0.0039% of Q-RPT span, whichever is
greater4
Q-RPTs A200M TO A280M (30 000 to 40 000 psi)
Precision2± 0.015% of reading or 0.0045% of Q-RPT span, whichever is
greater4
Measurement Uncertainty3± 0.018% of reading or 0.0054% of Q-RPT span, whichever is
greater4
1. Predicted Q-RPT measurement stability limit (k=2) over one year assuming regular use of AutoZero function. AutoZero
occurs automatically in gauge mode whenever vented, by comparison with barometric reference in absolute mode.
Absolute mode predicted one year stability without AutoZ is ± (0.005 % Q-RPT span + 0.005 % of reading).
2. Combined linearity, hysteresis, repeatability. Add + 1 Pa (0.00015 psi) in gauge mode with an Axxx (absolute) Q-RPT for
the resolution and short term stability of the on-board barometer.
3. Maximum deviation of the Q-RPT indication from the true value of applied pressure including precision, predicted one year
stability limit, temperature effect and calibration uncertainty, combined and expanded (k=2) following the ISO “Guide to the
Expression of Uncertainty in Measurement.”
4. % of reading value times measured pressure from 100 to 30 % of Q-RPT span. Under 30 % of Q-RPT span, % of reading
value times 30 % of Q-RPT span. For example, if the Q-RPT is a Standard A160K, the Measurement Uncertainty in
pressure is 0.010% times the measured pressure to 48 kPa (160 kPa span x 30%) and 0.0048 kPa (160 kPa span x 30%
x 0.01%) under 48 kPa.
5. % of reading value times measured pressure from 100 to 30 % of AutoRanged span. Under 30% of AutoRanged span, % of
reading value times 30% of AutoRanged span. If AutoRanged span is less then 30% of maximum Q-RPT span, % of reading
values times measured pressure, or % of reading times 9% of Q-RPT span, whichever is greater. For example, if the Q-RPT is a
Premium A160K and AutoRanged span is 160 kPa, the Measurement Uncertainty in pressure is measured pressure x 0.008% to
48 kPa (160 kPa AutoRanged span x 30%) and 0.0038 kPa (160 kPa span x 30% x 0.008%) under 48 kPa. If the AutoRanged
span is 100 kPa (greater than 30% of 160 kPa maximum Q-RPT span), the Measurement Uncertainty in pressure is measured
pressure x 0.008% to 30 kPa (100 kPa AutoRanged span x 30%) and 0.0025 kPa (100 kPa span x 30% x 0.008%) under 30 kPa.
If the AutoRanged span is 30 kPa (less than 30% of the 160 kPa maximum Q-RPT span), the Measurement Uncertainty in
pressure is measured pressure x 0.008% to 14.4 kPa (160 kPa maximum Q-RPT span x 9%) and 0.0012 kPa (160 kPa maximum
Q-RPT span x 9% x 0.008%) under 14.4 kPa.
1.2.2.2 ON-BOARD BAROMETER
The on-board barometer is used only to measure changes in atmospheric pressure
to provide dynamic compensation of the Q-RPT’s atmospheric pressure offset when
using an Axxx (absolute) Q-RPT to make gauge pressure measurements and for
line pressure compensation of G15K and BG15K Q-RPTs.
There is no on-board barometer in RPM4s that have G100K or G200K
Q-RPTs only”.

1. INTRODUCTION
Page 5 © 2004-2007 DH Instruments, a Fluke Company
1.2.3 BATTERY AND CHARGER PACK
Power Requirements 100 to 240 VAC, 50/60 Hz, 15 W max consumption
Operating Temperature Range 0 to 50 °C
Storage Temperature Range - 20 to 50 °C
Vibration Meets MIL-T-28800D
Weight 2 kg (4.4 lb)
Dimensions 8 cm H x 22.5 cm W x 20 cm D (3.1 in. x 8.9 in. x 7.9 in.)
Battery Type Nickel Metal-Hydride
Battery Voltage 12 VDC
Battery Capacity Typical: 9000 mAh
Min: 8200 mAh
Charge Time Full charge from empty, 14 to 16 hours approx.
Approx. Run Time, Full Charge 8 to 12 hours

RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page VI
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OT TE ES S

2. INSTALLATION
Page 7 © 2004-2007 DH Instruments, a Fluke Company
2
2. . I IN
NS ST TA AL LL LA AT TI IO ON N
2.1 UNPACKING AND INSPECTION
2.1.1 REMOVING FROM PACKAGING
RPM4 is delivered in a corrugated container with polyethylene inserts to hold it in place; or in
the optional molded, medium density polyethylene shipping case with a custom foam insert
for holding the RPM4.
Remove the RPM4 and its accessories from the shipping container and remove each
element from its protective plastic bag.
2.1.2 INSPECTING CONTENTS
Check that all items are present and have no visible damage.
A standard RPM4 includes all items indicated in Table 2.
Table 2. RPM4 Packing List
DESCRIPTION PART #
1 ea. RPM4 Reference Pressure Monitor FAM008
1 ea. Calibration Report 550100
ACCESSORIES: 401967 (401967-CE)
1 ea. Operation and Maintenance Manual 550129
1 ea. Power Cord (7.5 ft.) 100770 (100770-CE)
1 ea. Ferrite sleeve (snap on to COM2 cable for CE) 103303
1 ea. General Accessories Disk (white CD) 102987
OPTIONAL BATTERY/CHARGER PACK 401904 (401904-CE)
1 ea. Battery/charger pack 401980
1 ea. Battery/charger pack to RPM4 cable 401979
1 ea. Power Cord (7.5 ft.) 100770 (100770-CE)
1 ea. Instruction Sheet 560062

RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 8
2.2 SITE REQUIREMENTS
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. The RPM4 can also be mounted in a standard 19 in. rack mount
using the optional rack mount kit.
2.3 SETUP
2.3.1 PREPARING FOR OPERATION
To prepare RPM4 for check out and operation:
Remove the plastic caps from the RPM4 rear panel pressure connections.
Remove the protective plastic sheet from the front panel display.
Familiarize yourself briefly with the front and rear panels (see Section 2.3.2).
2.3.2 FRONT AND REAR PANELS
2.3.2.1 FRONT PANEL
1. Ready/Not Ready Indicator
2. Display
3. Remote Activity Indicator
4. Cursor Control Keys
5. Multi-Function Keypad
Figure 1. Front Panel

2. INSTALLATION
Page 9 © 2004-2007 DH Instruments, a Fluke Company
2.3.2.2 REAR PANEL
1. 12VDC Power Supply
Connection
2. Remote [ENT] Connector
3. IEEE-488 Connector
4. COM2 Connector
5. COM1 Connector
6. Power Switch
7. Fuse
8. Electrical Power Connector
(IEC-320-C13)
9. Fan
10. TEST(+) Pressure Port, Lo Q-RPT
(if Lo Q-RPT present)
11. TEST(-) Pressure Port, Lo Q-RPT
(if Lo-QRPT present, <A100M only)
12. TEST(+) Pressure Port, Hi Q-RPT
13. TEST(-) Pressure Port, Hi Q-RPT
(<A100M only)
14. VENT (<A10M>) or ATM (>A10M)
Pressure Port, Lo Q-RPT
15. VENT or ATM Pressure Port, Hi Q-RPT
16. Product Label (bottom of case)
Figure 2. Rear Panel
2.3.3 POWER CONNECTION
2.3.3.1 85 TO 264 VAC, 50/60 HZ VAC POWER
Check that the RPM4 power switch is OFF.
Connect the supplied power cable to the rear panel power module.
Connect the other end of the power cable to an electrical supply of 85 to 264 VAC,
50/60 Hz.
2.3.3.2 BATTERY PACK
Charge the battery pack fully (see Section 3.2.6).
Connect the RPM4 12VDC power connection on the rear panel of the RPM4
to the 12 VDC power connection on the battery/charge pack using the cable
supplied with the pack.
See Section 3.2.6 for additional information on battery/charger pack
operation and maintenance.

RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 10
2.3.4 REMOTE [ENT] CONNECTION (FOOTSWITCH OR OTHER
SWITCH)
Connect the optional remote ENTER footswitch, if available or a user supplied switch fitted to
the optional cable (see Section 7.1). Connect the cable to the RPM4 rear panel connection
labeled REMOTE ENTER. Activating the switch is equivalent to pressing the [ENT] key on
the front panel (see Section 3.1.3).
2.3.5 CONNECTING TO MEASURE PRESSURE (TEST(+) AND
TEST(-) PORTS)
Using a pressure connecting hose or tube of appropriate pressure rating, connect the device
or system to be tested to the RPM4 TEST(+) port.
The RPM4 TEST(+) connection is 1/8 in. NPT female (Q-RPTs of A70M or lower) or DH500 F
(Q-RPTs higher than A70M).
DH500 is a gland and collar type fittings for 6.35 mm (1/4 in.) coned and left hand
threaded tubes. DH500 is equivalent to AE F250C, HIP HF4, etc.
The TEST(+) and TEST(-) ports on Q-RPT modules of A70M and lower are threaded into
the aluminum Q-RPT manifold. Take care in making and breaking fittings not to cross
thread or otherwise damage the threads. It is recommended that an adaptor be
installed in the in Q-RPT manifold and make break operations be made on the adaptor
rather than the manifold.
SDS Self Defense System: Q-RPT modules designated A7M or lower include the SDS Self
Defense System. SDS, operated properly, allows a the Q-RPT TEST(+) port to be left
connected to a pressure up to 10 MPa (1 500 psi) without damage to the Q-RPT.
Do NOT attempt to use SDS in this manner without first becoming thoroughly familiar
with its operation and limitations (see Sections 3.2.7, 3.3.8, 3.5.4).
Q-RPT MODULE TEST(+) AND TEST(-) PORTS
Q-RPT modules of A70M and lower have both TEST(+) and TEST(-) ports. Q-RPT modules
greater than A70M have a TEST(+) port only. See Section 5.6, Figure 8 for RPM4 Q-RPT
module TEST port configurations.
The TEST(+) port is connected to Axxx (absolute) Q-RPTs’ sole measurement port and to the
high side of Gxxx or BGxxx (gauge or bi-directional gauge) Q-RPTs.
The TEST(-) port of Axxx and BGxxx Q-RPTs is connected to RPM4’s internal barometer.
The TEST(-) is connected to the low side of Gxxx (gauge) or Gxxx (bi-directional gauge)
Q-RPTs.
•When operating in absolute mode: The TEST(-) port, if present, is left open to
atmosphere.
•When operating in gauge or negative gauge mode with a range greater than 50 kPa
(7.5 psi): The TEST(-) port, if present, is normally left open to atmosphere. A possible
exception is when the device or system under test is in an ambient pressure that may differ
significantly from the ambient pressure around the RPM4. For example, if the RPM4 is
measuring the pressure applied to DUTs in an environmental chamber, the pressure in the
environmental chamber may be different from ambient pressure around the RPM4. In this