Fluke RPM4-AD User manual

© 2005-2007 DH Instruments, a Fluke Company
RPM4-AD™
Reference Pressure Monitor, Air Data Version
Operation and Maintenance Manual

© 2005-2007 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.
© 2005-2007 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, parallel measurement mode, //m mode, RPM4, QDUT, Q-RPT,
RPM4-AD and SDS are trademarks, registered and otherwise, of DH Instruments, a Fluke Company
Document No. 550148
051115
Printed in the USA.

TABLE OF CONTENTS
Page I © 2005-2007 DH Instruments, a Fluke Company
T
TA
AB BL LE E O
OF
F C
CO
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 TRANSDUCERS (Q-RPT)..............................................................2
1.2.2.2 ON-BOARD BAROMETER ........................................................................................................................4
1.2.3 BATTERY AND CHARGER PACK................................................................................................................4
2. INSTALLATION .................................................................. 5
2.1 UNPACKING AND INSPECTION ............................................................................................................5
2.1.1 REMOVING FROM PACKAGING..................................................................................................................5
2.1.2 INSPECTING CONTENTS.............................................................................................................................5
2.2 SITE REQUIREMENTS............................................................................................................................6
2.3 SETUP .....................................................................................................................................................6
2.3.1 PREPARING FOR OPERATION ...................................................................................................................6
2.3.2 FRONT AND REAR PANELS........................................................................................................................6
2.3.2.1 FRONT PANEL ..........................................................................................................................................6
2.3.2.2 REAR PANEL.............................................................................................................................................7
2.3.3 POWER CONNECTION.................................................................................................................................7
2.3.3.1 85 TO 264 VAC, 50/60 HZ VAC POWER ..................................................................................................7
2.3.3.2 BATTERY PACK ........................................................................................................................................7
2.3.4 REMOTE [ENT] CONNECTION (FOOTSWITCH OR OTHER SWITCH)......................................................8
2.3.5 CONNECTING TO MEASURE PRESSURE (PS AND PT PORTS)..............................................................8
2.3.6 THE VENT AND ATM PORTS .......................................................................................................................9
2.3.7 CHECK/SET SECURITY LEVEL ...................................................................................................................9
2.3.8 SDS FULL TIME OFF ....................................................................................................................................9
2.4 POWER-UP AND VERIFICATION.........................................................................................................10
2.4.1 SWITCH POWER ON ..................................................................................................................................10
2.4.2 CHECK PRESSURE MEASUREMENT OPERATION.................................................................................10
2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT.............................................................10
2.4.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT...................................................................10
2.5 SHORT TERM STORAGE .....................................................................................................................11
3. OPERATION..................................................................... 13
3.1 USER INTERFACE ................................................................................................................................13
3.1.1 MAIN RUN SCREEN....................................................................................................................................13
3.1.2 FUNCTION / DATA KEYPAD LAYOUT AND PROTOCOL.........................................................................15
3.1.3 REMOTE [ENT] (ENTER) FOOTSWITCH...................................................................................................16
3.1.4 SOUNDS ......................................................................................................................................................16

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company Page II
3.2 GENERAL OPERATING PRINCIPLES .................................................................................................16
3.2.1 Q-RPTS AND Q-RPT SELECTION..............................................................................................................16
3.2.2 GAUGE AND NEGATIVE GAUGE MEASUREMENT, DYNAMIC COMPENSATION
FOR ATMOSPHERIC PRESSURE..............................................................................................................17
3.2.3 ALTITUDE AND AIRSPEED MEASUREMENT...........................................................................................18
3.2.3.1 RPM4-AD A160K/A160K (ROTARY WING).............................................................................................18
3.2.3.2 RPM4-AD A350K/A160K (FIXED WING).................................................................................................19
3.2.4 PRESSURE READY/NOT READY ..............................................................................................................20
3.2.5 PARALLEL MEASUREMENT MODE (//MTM) (RPM4-AD A160K/A160K ONLY) .......................................20
3.2.6 DIFFERENTIAL MEASUREMENT MODE...................................................................................................21
3.2.7 AUTOZERO FUNCTION ..............................................................................................................................21
3.2.8 SDS SELF DEFENSE SYSTEM ..................................................................................................................21
3.2.9 USE OF THE 12VDC BATTERY/CHARGER PACK ...................................................................................22
3.2.10 USING RPM4-AD WITH A PPC3 CONTROLLER/CALIBRATOR ..............................................................23
3.2.11 DIRECT FUNCTION KEYS SUMMARY ......................................................................................................23
3.3 DIRECT FUNCTION KEYS....................................................................................................................24
3.3.1 [RANGE] ......................................................................................................................................................24
3.3.1.1 RPM4-AD A160K/A160K (ROTARY WING).............................................................................................25
3.3.1.2 RPM4-AD A350K/A160K (FIXED WING).................................................................................................26
3.3.2 [UNIT]...........................................................................................................................................................27
3.3.3 [MODE] ........................................................................................................................................................30
3.3.3.1 DIFFERENTIAL MEASUREMENT MODE OPERATION .........................................................................31
3.3.4 [AUTORANGE] ............................................................................................................................................33
3.3.5 [LEAK CK]/RATE OF CHANGE MEASUREMENT .....................................................................................33
3.3.6 [DISPLAY]....................................................................................................................................................34
3.3.6.1 AVG (AVERAGE) .....................................................................................................................................36
3.3.6.2 RATE........................................................................................................................................................37
3.3.6.3 DEV (DEVIATION) ...................................................................................................................................38
3.3.6.4 RPT ..........................................................................................................................................................39
3.3.6.5 HI/LO ........................................................................................................................................................40
3.3.6.6 FREEZE ...................................................................................................................................................41
3.3.6.7 CLEAN .....................................................................................................................................................42
3.3.7 [HEAD] .........................................................................................................................................................42
3.3.8 [SDS] (SELF DEFENSE SYSTEM) .............................................................................................................43
3.3.8.1 SDS IN DIFFERENTIAL MEASUREMENT MODE ..................................................................................45
3.3.8.2 SDS IN PARALLEL MEASUREMENT MODE, RPM4-AD A160K/A160K ONLY.....................................46
3.3.9 [AUTOZ].......................................................................................................................................................47
3.3.9.1 [AUTOZ] IN GAUGE AND NEGATIVE GAUGE MODE ...........................................................................47
3.3.9.2 [AUTOZ] IN ABSOLUTE MODE...............................................................................................................48
3.3.9.3 AUTOZ IN DIFFERENTIAL MODE ..........................................................................................................51
3.3.10 [ENT] ............................................................................................................................................................52
3.4 [SETUP] .................................................................................................................................................53
3.4.1 <1RANGE> ..................................................................................................................................................53
3.4.2 <2RES> (RESOLUTION) .............................................................................................................................53
3.4.3 <3STAB>......................................................................................................................................................54
3.4.4 <4UL> (UPPER LIMIT) ................................................................................................................................55
3.4.4.1 OVER PRESSURE FUNCTION...............................................................................................................56
3.4.5 <5ATEST>....................................................................................................................................................56
3.5 [SPECIAL] .............................................................................................................................................56
3.5.1 <1AUTOZ> ...................................................................................................................................................57
3.5.1.1 EDIT AUTOZ ............................................................................................................................................61
3.5.2 <2REMOTE> ................................................................................................................................................61
3.5.2.1 <1COM1, 2COM2>...................................................................................................................................62
3.5.2.2 <3IEEE-488>............................................................................................................................................62
3.5.2.3 <4FORMAT> ............................................................................................................................................62
3.5.2.4 <5RS232 SELF-TEST>............................................................................................................................63
3.5.3 <3HEAD> .....................................................................................................................................................63
3.5.4 <4SDS>........................................................................................................................................................64
3.5.4.1 <1TEMP OPEN/CLOSE>.........................................................................................................................64
3.5.4.2 <2FULL TIME ON/OFF> ..........................................................................................................................65
3.5.5 <5PREFS> ...................................................................................................................................................65
3.5.5.1 <1SCRSVR> ............................................................................................................................................66
3.5.5.2 <2SOUND> ..............................................................................................................................................66
3.5.5.3 <3TIME>...................................................................................................................................................67
3.5.5.4 <4ID>........................................................................................................................................................67
3.5.5.5 <5LEVEL> (SECURITY)...........................................................................................................................68
3.5.6 <6PUNIT>.....................................................................................................................................................70
3.5.7 <7INTERNAL> .............................................................................................................................................74
3.5.7.1 <1BARO> .................................................................................................................................................74
3.5.7.2 <2READRT> ............................................................................................................................................75
3.5.7.3 <3RPT2X>................................................................................................................................................76
3.5.7.4 <4LO VNT> ..............................................................................................................................................76

TABLE OF CONTENTS
Page III © 2005-2007 DH Instruments, a Fluke Company
3.5.7.5 <5LOG>....................................................................................................................................................76
3.5.8 <8CAL> ........................................................................................................................................................77
3.5.9 <9RESET> ...................................................................................................................................................77
3.5.9.1 <1SETS>..................................................................................................................................................78
3.5.9.2 <2 UNITS> ...............................................................................................................................................78
3.5.9.3 <3ATEST>................................................................................................................................................78
3.5.9.4 <4 CAL> ...................................................................................................................................................79
3.5.9.5 <5 ALL>....................................................................................................................................................79
4. REMOTE OPERATION ....................................................... 81
4.1 OVERVIEW ............................................................................................................................................81
4.2 INTERFACING.......................................................................................................................................81
4.2.1 RS232 INTERFACE .....................................................................................................................................81
4.2.1.1 COM1 .......................................................................................................................................................81
4.2.1.2 IEEE-488 ..................................................................................................................................................82
4.2.1.3 COM2 .......................................................................................................................................................82
4.3 PROGRAMMING FORMATS.................................................................................................................82
4.3.1 CLASSIC PROGRAM MESSAGE FORMAT ...............................................................................................83
4.3.2 ENHANCED PROGRAM MESSAGE FORMAT ..........................................................................................83
4.3.2.1 USING COMMAND TYPE COMMANDS .................................................................................................83
4.3.2.2 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
4.4.5 REMOTE AIRDATA SETUP PROCEDURES............................................................................................107
4.5 STATUS REPORTING SYSTEM .........................................................................................................108
4.5.1 ERROR QUEUE.........................................................................................................................................108
4.5.2 STATUS BYTE REGISTER .......................................................................................................................109
4.5.3 STANDARD EVENT REGISTER ...............................................................................................................110
4.5.4 READY STATUS REGISTER ....................................................................................................................111
4.6 IEEE STD. 488.2 COMMON AND STATUS PROGRAM MESSAGES................................................112
4.6.1 PROGRAM MESSAGE DESCRIPTIONS ..................................................................................................112
5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION ................115
5.1 OVERVIEW ..........................................................................................................................................115
5.2 CALIBRATION OF QUARTZ REFERENCE PRESSURE TRANSDUCERS (Q-RPT).........................115
5.2.1 PRINCIPLE ................................................................................................................................................115
5.2.1.1 PA AND PM COEFFICIENTS ................................................................................................................116
5.2.1.2 AS RECEIVED AND AS LEFT DATA ....................................................................................................116
5.2.2 EQUIPMENT REQUIRED ..........................................................................................................................117
5.2.3 SET-UP AND PREPARATION...................................................................................................................117
5.2.3.1 RPM4 A160K/A160K (ROTARY WING).................................................................................................117
5.2.3.2 RPM4 A350K/A160K (FIXED WING) .....................................................................................................118
5.2.4 RECOMMENDED CALIBRATION POINT SEQUENCE............................................................................118
5.2.4.1 A160K Q-RPT CALIBRATION SEQUENCE ..........................................................................................118
5.2.4.2 A350K Q-RPT CALIBRATION SEQUENCE ..........................................................................................119
5.2.5 TURNING OFF ABSOLUTE AND NEGATIVE GAUGE MEASURE ME NT MO DE S ...........................120
5.2.6 Q-RPT CALIBRATION USING CALTOOL FOR RPTS SOFTWARE........................................................120
5.2.7 EDITING AND VIEWING Q-RPT CALIBRATION INFORMATION............................................................120
5.2.8 Q-RPT CALIBRATION/ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE.........................121
5.3 ADJUSTMENT OF ON-BOARD BAROMETER...................................................................................123
5.4 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY......................................................123
5.5 SUBASSEMBLY DESCRIPTION AND LOCATION ............................................................................124
5.5.1 MINI MICRO BOARD .................................................................................................................................124
5.5.2 POWER SUPPLY MODULE ......................................................................................................................124
5.5.3 DRIVER BOARD........................................................................................................................................125
5.5.4 ON-BOARD BAROMETER........................................................................................................................125
5.5.5 Q-RPT MODULE........................................................................................................................................125
5.5.5.1 HI Q-RPT MODULE ...............................................................................................................................125
5.5.5.2 LO Q-RPT MODULE ..............................................................................................................................125
5.5.6 DISPLAY ....................................................................................................................................................125

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company Page IV
5.6 Q-RPT MODULE PNEUMATIC SCHEMATIC AND VALVE STATES .................................................126
5.6.1 RPM4-AD A160K/A160K (ROTARY WING)..............................................................................................126
5.6.2 RPM4-AD A350K/A160K (FIXED WING) ..................................................................................................127
6. TROUBLESHOOTING .......................................................129
7. APPENDIX......................................................................133
7.1 REMOTE [ENT] ...................................................................................................................................133
7.2 UNIT CONVERSION............................................................................................................................134
7.2.1 PRESSURE................................................................................................................................................134
7.2.2 ALTITUDE..................................................................................................................................................134
7.2.3 AIRSPEED .................................................................................................................................................135
8. WARRANTY ....................................................................139
8.1 OVERVIEW ..........................................................................................................................................139
9. GLOSSARY.....................................................................141

TABLES & FIGURES
Page V © 2005-2007 DH Instruments, a Fluke Company
T
TA
AB BL LE ES S
Table 1. Quartz Reference Pressure Transducer (Q-RPT) module designations and ranges ................... 3
Table 2. RPM4-AD packing list .................................................................................................................... 5
Table 3. Making pressure connections to RPM4-AD................................................................................... 8
Table 4. Position designators of Q-RPTs in an RPM4-AD system............................................................ 16
Table 5. Settings and what they are specific to (range, measurement mode, Q-RPT, system) .............. 17
Table 6. Summary of RPM4-AD function key operation ............................................................................ 24
Table 7. Available unit of measure types by active Q-RPT and measurement mode,
RPM4-AD A160K/A160K (rotary wing).................................................................................... 28
Table 8. Available unit of measure types by active Q-RPT and measurement mode,
RPM4-AD A350K/A160K (fixed wing) ..................................................................................... 28
Table 9. Default [UNIT] choices by active Q-RPT and measurement mode,
RPM4 A160K/A160K (rotary wing).......................................................................................... 29
Table 10. Default [UNIT] choices by active Q-RPT and measurement mode,
RPM4 A350K/A160K (rotary wing).......................................................................................... 29
Table 11. AutoZ ON and OFF.................................................................................................................... 59
Table 12. Security levels............................................................................................................................ 69
Table 13. Available unit of measure types by active Q-RPT and measurement mode,
RPM4-AD A160K/A160K (rotary wing).................................................................................... 71
Table 14. UNIT function - available units of measure................................................................................ 72
Table 15. Available unit of measure types by active Q-RPT and measurement mode,
RPM4-AD A350K/A160K (fixed wing) ..................................................................................... 73
Table 16. READRT - display update rates................................................................................................. 75
Table 17. Reset – Sets............................................................................................................................... 78
Table 18. Reset – Cal ................................................................................................................................ 79
Table 19. Reset – All.................................................................................................................................. 79
Table 20. COM1 Pin Designations and Connections ................................................................................81
Table 21. COM2 DB-9F Pin Designations ................................................................................................. 82
Table 22. Program Message List............................................................................................................... 85
Table 23. Error #s and Descriptions .......................................................................................................... 86
Table 24. 8 bit status byte register........................................................................................................... 109
Table 25. 8 bit standard event register .................................................................................................... 110
Table 26. 8 bit ready status register......................................................................................................... 111
Table 27. IEEE-488.2 common and status program message list .......................................................... 112
Table 28. Calibration point sequence, A160K Q-RPT ............................................................................. 119
Table 29. Calibration point sequence, A350K Q-RPT ............................................................................. 119
Table 30. Q-RPT module valve states, RPM4-AD A160K/A160K........................................................... 126
Table 31. Q-RPT module valve states, RPM4-AD A350K/A160K........................................................... 127
Table 32. Troubleshooting guide ............................................................................................................. 129
Table 33. Pressure unit of measure conversion coefficients ................................................................... 134
Table 34. DHI Authorized Service Providers ........................................................................................... 140

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company Page VI
F
FI
IG GU UR RE ES S
Figure 1. Front panel.................................................................................................................................... 6
Figure 2. Rear panel .................................................................................................................................... 7
Figure 3. MAIN RUN screen display fields ................................................................................................ 14
Figure 4. Keypad layout ............................................................................................................................. 15
Figure 5. Battery pack/charger................................................................................................................... 23
Figure 6. Status register schematic ......................................................................................................... 109
Figure 7. Internal view.............................................................................................................................. 124
Figure 8. Pneumatic schematic and valve states, RPM4-AD A160K/A160K (rotary wing) ..................... 126
Figure 9. Pneumatic schematic and valve states, RPM4-AD A350K/A160K (fixed wing)....................... 127
Figure 10. Remote [ENT] connector schematic....................................................................................... 133

ABOUT THIS MANUAL
Page VII © 2005-2007 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-AD
reference pressure monitor. It also includes a great deal of additional information provided to allow you to
optimize RPM4-AD use and take full advantage of its many features and functions.
This manual is specific to the “-AD” configuration of RPM4 (“AD” in front panel configuration window). If
you are not using an RPM4-AD, use the general RPM4 Operation and Maintenance Manual p/n 550129.
Before using the manual, take a moment to familiarize yourself with the Table of Contents structure:
Sections 1, 2 and 3 should be read by all first time RPM4-AD users. Section 3 is most important for those
using the local front panel interface but should be read over by all users to familiarize themselves with
general RPM4-AD operating principles. Section 4 is for remote operation from an external computer. Section
5 provides maintenance and calibration information. Section 6 is a quick troubleshooting guide. Use it to
troubleshoot unexpected RPM4-AD behavior based on the symptom of that behavior. Certain words and
expressions have specific meaning as they pertain to RPM4-AD. The Glossary, Section 9, is useful as a
quick reference for exact definition of specific words and expressions as they are used in the manual.
For those of you who “don’t read manuals”, go directly to Section 2.3 to set up your RPM4-AD and
then go to Section 2.4 for power-up and verification. This will get you up and running quickly with a
minimal risk of causing damage to yourself or your RPM4-AD. THEN… when you have questions or
start to wonder about all the great features you might be missing, get into the manual!
Manual Conventions
(CAUTION) is used in throughout the manual to identify user warnings and cautions.
(NOTE) is used throughout the manual to identify operating and applications advice and
additional explanations.
[ ] indicates direct function keys (e.g., [RANGE]).
< > indicates RPM4-AD screen displays (e.g., <1yes>).

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company Page VIII
N
NO
OT TE ES S

1. INTRODUCTION
Page 1 © 2005-2007 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-AD is a stand-alone, microprocessor driven, reference pressure monitor intended to precisely
measure gas pressure in the range of air data instruments. It is designed to provide very high
performance and extensive features combined with maximum versatility and ease of use. It is particularly
well suited as a reference air data measurement device used to validate or calibrate air data test sets.
RPM4-AD uses two quartz reference pressure transducer (Q-RPT) modules and a barometer to measure
pressure. There are two configurations. RPM4 A160Ka/A160Ka covers the altitude and airspeed range
typically appropriate for rotary winged aircraft. RPM4 A350Ka/A160Ka covers the range of altitude and
airspeed typically appropriate for fixed wing aircraft.
RPM4-AD can be controlled locally by the operator using its front panel display and keypad or remotely
by a computer using ASCII character command strings transmitted over its standard RS232 or
IEEE-488.2 interface.
RPM4-AD is a specialized air data version of the RPM4 Reference Pressure Monitor. The RPM4
Reference Pressure Monitor is available in a very wide variety of other configurations covering pressure
ranges from as low as - 3 to 3 kPa (0.4 psi) to as high as 280 MPa (40 000 psi) in absolute, gauge,
compound gauge and differential measurement modes.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 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
Ventilation To prevent product overheating, provide proper ventilation. Allow 10 cm
(4 in.) clearance from rear panel cooling fan.
Storage Temperature Range - 20 to 70 °C
Vibration Meets MIL-T-28800D
Weight 5 kg (11 lb)
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 Lo Q-RPT Hi Q-RPT Qc (sea level)
A160K/A160K 160 kPa abs (23 psi) 160 kPa abs (23 psi) 60 kPa (8.7 psi)
A160K/A350K 160 kPa abs (23 psi) 350 kPa abs (51 psi) 250 kPa (36 psi)
Altitude Range
A160K/A160K - 4 000 to 20 000 m (- 13 000 to 66 000 ft)
A160K/A350K - 4 000 to 30 000 m (- 13 000 to 100 000 ft)
Airspeed Range (sea level)
A160K/A160K 0 to 1020 km/hr (550 kts)
A160K/A350K 0 to 2040 km/hr (1100 kts)
Operating Medium Clean, dry, non-corrosive gas
Pressure Connections
Ps , Pt AN-4 (37º flare) male
VENT, ATM 10-32 UNF
Self Defense System (SDS™) Included. Isolates Q-RPTs from Ps and Pt test ports and vents Q-RPTs to
atmosphere.
Pressure Limits A160K Q-RPT A350K Q-RPT
Maximum working pressure 160 kPa abs (23 psi) 350 kPa abs (51 psi)
Maximum pressure without
damage
200 kPa abs (29 ipsi) 370 kPa abs (54 psi)
Maximum SDS protection 10 MPa (1500 psi)
CE Mark Available, must be specified
1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS
1.2.2.1 QUARTZ REFERENCE PRESSURE TRANSDUCERS (Q-RPT)
RPM4-AD includes two quartz reference pressure transducers (Q-RPT). Both are of the
absolute (Axxx) type using an evacuated, permanently sealed reference.
Axxx Q-RPTs are used to measure absolute, gauge and negative gauge pressure.
Gauge pressure is defined by offsetting atmospheric pressure and applying dynamic
compensation for atmospheric changes using the on-board barometer (see
Section 3.2.2). Airspeed is calculated from the differential pressure between the
Hi (Pt) and Lo (Ps) Q-RPTs or from gauge pressure (differential from current
atmospheric pressure). See Section 3.3.3 for additional information on
RPM4-AD measurement modes
In RPM4-AD A160K/A160K, the two Q-RPTs are sometimes used together in
parallel measurement mode (//mTM) to measure altitude or airspeed at altitude
corresponding to ambient atmospheric pressure, reducing the uncertainty on the
measurement (see Section 3.2.5).

1. INTRODUCTION
Page 3 © 2005-2007 DH Instruments, a Fluke Company
Table 1. Quartz Reference Pressure Transducer (Q-RPT)
module designations and ranges
MAXIMUM PRESSURE
[kPa]
MAXIMUM PRESSURE
[psi]
Q-RPT
DESIGNATION
Absolute Gauge Absolute Gauge
A350Ka1 (Pt) 350 250 51 36
A160Ka1(Ps or Pt) 160 60 23 8.7
GENERAL
Pressure Ranges Lo Q-RPT Hi Q-RPT Qc (sea level)
A160K/A160K 160 kPa abs (23 psi) 160 kPa abs (23 psi) 60 kPa (8.7 psi)
A160K/A350K 160 kPa abs (23 psi) 350 kPa abs (51 psi) 250 kPa (36 psi)
Altitude Range
A160K/A160K - 4 000 to 20 000 m (- 13 000 to 66 000 ft)
A160K/A350K - 4 000 to 30 000 m (- 13 000 to 100 000 ft)
Airspeed Range (sea level)
A160K/A160K 0 to 1020 km/hr (550 kts)
A160K/A350K 0 to 2040 km/hr (1100 kts)
Resolution To 1 ppm, user adjustable
Warm Up Time 30 minute temperature stabilization recommended from cold power up for
optimum performance.
Operating Temperature
Range
15 to 35 °C
Acceleration Affect ± 0.008 % /g maximum, worst axis
Allows operation ± 20° from reference plane without significant effect
Predicted Stability1± 0.005% of reading
Note: the two Q-RPTs in RPM4-AD A160K/A160K can be compared one
to the other to assist in identifying Q-RPT drift between calibrations
RPM4-AD A160K/A160K (rotary wing)
HL Q-RPT
(absolute, gauge)
Used for: altitude with
best uncertainty;
airspeed at ground
altitude only
HI or LO Q-RPT
(absolute, gauge)
Used for: Not normally
used for air data
measurements
HI Q-RPT
(differential)
Used for: airspeed at
varying altitude
Precision2± 0.004 % of reading or
2 Pa, whichever is
greater4
± 0.005 % of reading or
2.4 Pa, whichever is
greater4
± 0.005 % of reading or
2.4 Pa, whichever is
greater4
Measurement
Uncertainty3
± 0.006% of reading or
3 Pa, whichever is
greater4
± 0.008% of reading or
3.8 Pa, whichever is
greater4
± 0.008% of reading or
3 Pa, whichever is greater
1. Predicted Q-RPT measurement stability limit (k=2) over one year assuming regular use of AutoZero function. AutoZero is
performed by the operator: against zero pressure when vented in gauge mode, by direct comparison of one Q-RPT to the
other at the line pressure in differential mode, by comparison with a barometric reference in absolute mode. Absolute
mode predicted one year stability without AutoZ is ± (0.005 % Q-RPT span + 0.005 % of reading).
2. Combined linearity, hysteresis, repeatability. Add + 1 Pa (0.00015 psi) in gauge mode for the resolution and short term
stability of the on-board barometer.
3. Maximum deviation of the Q-RPT indication from the true value of applied pressure including precision, predicted one year
stability limit, temperature effect and calibration uncertainty, combined and expanded (k=2) following the ISO “Guide to the
Expression of Uncertainty in Measurement.” Add + 1 Pa (0.00015 psi) when measuring airspeed and using the Lo Q-RPT
to display altitude.
4. % of reading applies to 30 to 100 % of Q-RPT span. Under 30 % of Q-RPT span, the value is a constant which is the % of
reading value times 30 %.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company Page 4
RPM4-AD A350K/A160K (fixed wing)
LO Q-RPT
(absolute, gauge)
Used for: altitude
HI Q-RPT
(absolute, gauge)
Used for: airspeed at
ground altitude only
HI Q-RPT
(differential)
Used for: airspeed at
varying altitude
Precision2± 0.005 % of reading or
2.4 Pa, whichever is
greater4
± 0.005 % of reading or
5.25 Pa, whichever is
greater4
± 0.005 % of reading or
5.25 Pa, whichever is
greater4
Measurement
Uncertainty3
± 0.008% of reading or
3.8 Pa, whichever is
greater4
± 0.008% of reading or
8.4 Pa, whichever is
greater4
± 0.008% of reading or
6.6 Pa, whichever is greater
1. Predicted Q-RPT measurement stability limit (k=2) over one year assuming regular use of AutoZero function. AutoZero is
performed by the operator: against zero pressure when vented in gauge mode, by direct comparison of one Q-RPT to the
other at the line pressure in differential mode, by comparison with a barometric reference in absolute mode. Absolute
mode predicted one year stability without AutoZ is ± (0.005 % Q-RPT span + 0.005 % of reading).
2. Combined linearity, hysteresis, repeatability. Add + 1 Pa (0.00015 psi) in gauge mode for the resolution and short term
stability of the on-board barometer.
3. Maximum deviation of the Q-RPT indication from the true value of applied pressure including precision, predicted one year
stability limit, temperature effect and calibration uncertainty, combined and expanded (k=2) following the ISO “Guide to the
Expression of Uncertainty in Measurement.” Add + 1 Pa (0.00015 psi) when measuring airspeed and using the Lo Q-RPT
to display altitude.
4. % of reading applies to 30 to 100 % of Q-RPT span. Under 30 % of Q-RPT span, the value is a constant which is the % of
reading value times 30 %.
1.2.2.2 ON-BOARD BAROMETER
The on-board barometer is used only to measure changes in atmospheric
pressure to provide dynamic compensation of the Q-RPT’s atmospheric pressure
offset when making gauge pressure measurements and when displaying altitude
while measuring airspeed.
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

2. INSTALLATION
Page 5 © 2005-2007 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-AD is delivered in a corrugated container with polyethylene inserts to hold it in place;
or in the optional molded, medium density polyethylene shipping case with a custom foam
insert for holding the RPM4-AD.
Remove the RPM4-AD and its accessories from the shipping container and remove each
element from its protective plastic bag.
2.1.2 INSPECTING CONTENTS
Check that all items are present and have no visible damage.
A standard RPM4-AD includes all items indicated in Table 2.
Table 2. RPM4-AD packing list
DESCRIPTION PART #
1 ea. RPM4-AD Reference Pressure Monitor FAM008
1 ea. Calibration Report 550100
ACCESSORIES: 402294 (402294-CE)
1 ea. Operation and Maintenance Manual 550148
1 ea. Power Cord (7.5 ft.) 100770 (100770-CE)
1 ea. Ferrite sleeve (snap on to COM2 cable for CE) 103303
1 ea. General Accessories Disk (white CD) 102987
OPTIONAL BATTERY/CHARGER PACK 401904 (401904-CE)
1 ea. Battery/charger pack 401980
1 ea. Battery/charger pack to RPM4-AD cable 401979
1 ea. Power Cord (7.5 ft.) 100770 (100770-CE)
1 ea. Instruction Sheet 560062

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company Page 6
2.2 SITE REQUIREMENTS
Install RPM4-AD on a flat, stable surface at a convenient height. The front feet can be extended so that
the unit can be inclined for easier viewing. The RPM4-AD can also be mounted in a standard 19 in. rack
using the optional rack mount kit.
2.3 SETUP
2.3.1 PREPARING FOR OPERATION
To prepare RPM4-AD for check out and operation:
Remove the plastic caps from the RPM4-AD rear panel pressure connections.
Remove the protective plastic sheet from the front panel display.
Familiarize yourself briefly with the front and rear panels (see Section 2.3.2).
2.3.2 FRONT AND REAR PANELS
2.3.2.1 FRONT PANEL
1. Ready/not ready indicator
2. Display
3. Remote activity indicator
4. Cursor control keys
5. Multi-function keypad
Figure 1. Front panel

2. INSTALLATION
Page 7 © 2005-2007 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. Product label (bottom of case)
11. TEST (Ps), low Q-RPT
12. TEST (Pt), high Q-RPT
13. ATM port
14. VENT port
Figure 2. Rear panel
2.3.3 POWER CONNECTION
2.3.3.1 85 TO 264 VAC, 50/60 HZ VAC POWER
Check that the RPM4-AD power switch is OFF.
Connect the supplied power cable to the rear panel power module.
Connect the other end of the power cable to an electrical supply of 85 to 264 VAC,
50/60 Hz.
2.3.3.2 BATTERY PACK
Charge the battery pack fully (see Section 3.2.9).
Connect the RPM4-AD 12VDC power connection on the rear panel of the
RPM4-AD to the 12 VDC power connection on the battery/charge pack using
the cable supplied with the pack.
See Section 3.2.9 for additional information on battery/charger pack
operation and maintenance.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company Page 8
2.3.4 REMOTE [ENT] CONNECTION (FOOTSWITCH OR OTHER
SWITCH)
Connect the optional remote ENTER footswitch, if available or a user supplied switch fitted to
the optional cable (see Section 7.1). Connect the cable to the RPM4-AD rear panel
connection labeled REMOTE ENTER. Closing the switch is equivalent to pressing the [ENT]
key on the front panel (see Section 3.1.3).
2.3.5 CONNECTING TO MEASURE PRESSURE (PSAND PT
PORTS)
Using a pressure connecting hose or tube of appropriate pressure rating, connect the device
or system to be tested to the RPM4-AD TEST (Pt) and/or TEST (Ps) ports.
The RPM4-AD TEST (Pt) and TEST (Ps) connections are AN4 (1/4 in.) male.
See Table 3 for instructions on how to connect to the RPM4-AD TEST ports depending on
what is to be measured. See Section 5.6 for schematics of RPM4-AD TEST ports, Q-RPTs
and internal valve configurations. Typically, when testing an air data device, the air data
device Ps port is connected to the RPM4-AD Ps port and the air data device Pt port is
connected to the RPM4-AD Pt port.
Table 3. Making pressure connections to RPM4-AD
RPM4-AD A160K/A160K RPM4-AD A350K/A160KTYPE OF
MEASUREMENT TEST(Pt) TEST(Ps) VENT TEST(Pt) TEST(Ps) VENT
Airspeed at varying
altitude (true Ps
and Pt differential
operation)
Connect to
DUT Pt
port
Connect
to DUT Ps
or altitude
port
Not used Connect to
DUT Pt
port
Connect to
DUT Ps or
altitude port
Not used
Altitude only, best
uncertainty
and
absolute pressure
Not used.
May be
connected
to DUT Pt
port
Connect
to DUT
Ps,
altitude or
abs port
Not used Not used.
May be
connected
to DUT Pt
port
Connect to
DUT Ps,
altitude or
abs port
Not used
Airspeed at ground
altitude only
(A160K/A160)
and
gauge pressure
Connect to
DUT Pt
port
Not used.
May be
connected
to DUT or
Ps port
Not used.
May be
connected
to DUT or
Ps port
Connect to
DUT Pt
port
Not used. May
be connected
to DUT or Ps
port
Not used
Gauge pressure
or
negative gauge
pressure
Connect to
DUT (+) or
gauge port
Not used Connect
to DUT (-)
port
(optional)
Connect to
DUT (+)or
gauge port
to measure
with Hi
Q-RPT
Connect to
DUT (+)or
gauge port to
measure with
Lo Q-RPT
Connect to
DUT (-)
port
(optional)
RPM4-AD includes the SDS Self Defense System on both of its Q-RPTs. SDS, operated
properly, allows a the Q-RPT TEST port to be left connected to a pressure up to
10 MPa (1 500 psi) without damage to the Q-RPT. Do NOT attempt to use SDS in this
manner without first becoming thoroughly familiar with its operation and limitations (see
Sections 3.2.8, 3.3.8, 3.5.4).

2. INSTALLATION
Page 9 © 2005-2007 DH Instruments, a Fluke Company
Using the RPM4-AD connected to a system with liquid contaminants without taking
proper precautions to purge the system and test line may cause contamination of the
RPM4-AD that will require non-warranty service.
2.3.6 THE VENT AND ATM PORTS
The RPM4-AD Hi Q-RPT module has a VENT port. The VENT port is connected to the Q-RPT
Self Defense System (SDS) Q-RPT vent valves. The VENT port should always be left completely
unobstructed and open to ambient atmospheric pressure.
RPM4-AD Lo Q-RPT module has an ATM port. The ATM port is connected to the RPM-AD
internal barometer. The VENT port should always be left completely unobstructed and open to
ambient atmospheric pressure. When operating RPM4-AD A160K/A160K in parallel gauge
pressure mode to measure airspeed, the vent port may be connected to the DUT Ps or
altitude port to assure that the RPM4 and the DUT are at the same altitude setting. In this
case, altitude must remain between -700 and 3000 m (110 to 70 kPa abs).
See Section 5.6 for schematics of RPM4-AD TEST and VENT ports, Q-RPT and internal
valve configurations.
NEVER plug, obstruct or connect a supply pressure to an RPM4-AD VENT port. This will
adversely affect GAUGE mode operation and AutoZeroing functions.
2.3.7 CHECK/SET SECURITY LEVEL
RPM4-AD has a security system based on user levels. By default, the security system is set
to “low”, which includes access restriction to internal calibration coefficients, and there is no
password required to change the security level. See Section 3.5.5.5 for information on the
security level system. As part of the RPM4-AD startup, determine the security level that is
appropriate for the RPM4-AD and set a password if desired.
RPM4-AD is delivered with the security level set to “low” to avoid inadvertent altering of
critical internal settings but with access to changing security levels unrestricted. It is
recommended that the low security level be maintained at all times and password
protection be implemented if control over setting of security levels is desired.
2.3.8 SDS FULL TIME OFF
RPM4-AD includes the SDS Self Defense System on both its TEST ports to shut
them off from a pressure connected to them when they are not in use. If this
function is not desired, SDS can be turned full time off so that in regular
operation, SDS is not present. With SDS full time off, the SDS overpressure
protection is still active.
See Section 3.5.4.2 for instructions on turning SDS full time off if desired.

RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company Page 10
2.4 POWER-UP AND VERIFICATION
2.4.1 SWITCH POWER ON
Actuate the power switch on the RPM4-AD rear panel (if a 12 VDC power supply is already
connected to the 12 VDC connection, RPM4-AD power is already on). Observe the front panel
display as RPM4-AD initializes, error checks and goes to the MAIN RUN screen (see 3.1.1).
If the RPM4-AD fails to reach the MAIN RUN screen, service is required. Record the
sequence of operations and displays observed.
SDS is CLOSED at power up and the TEST ports are shut off. This causes <SDS
CLOSED> to be flash periodically in the MAIN RUN screen in place of the measured
pressure value.
2.4.2 CHECK PRESSURE MEASUREMENT OPERATION
2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT
Check the RPM4-AD operates properly in absolute mode.
Make sure that the TEST (Ps) and TEST (Pt) ports are vented to atmosphere.
Press the [MODE] function key and select <absolute> mode (see Section 3.3.3).
Use [UNIT] to select a pressure unit of measure (not altitude) (see Section 3.3.2).
If SDS is CLOSED (<SDS CLOSED> flashes over the display of pressure on
the top line of the display), Press [SDS], <2yes> to OPEN SDS (see Section 3.3.8).
Do NOT OPEN SDS with a pressure higher than the maximum pressure of the
Q-RPT applied to the TEST port. Damage to the Q-RPT may result.
The RPM4-AD should be measuring the current value of atmospheric pressure.
Check that the value agrees with the local value of atmospheric pressure within
measurement tolerances (see Section 1.2.2.1). If RPM4-AD does not agree
within tolerance, it may need to be AutoZeroed (see Section 3.3.9), calibrated
(see Section 5.2) or repaired.
2.4.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT
Check the RPM4-AD operates properly in gauge mode.
Make sure that the TEST (Ps) and TEST (Pt) ports are vented to atmosphere.
Press the [MODE] function key and select <gauge> mode. Use [UNIT] to select a
pressure unit of measure (not airspeed) (see Section 3.3.2).
If SDS is CLOSED (<SDS CLOSED> flashes over the display of pressure on the
top line of the display), OPEN SDS. Press [SDS], <2yes> to OPEN SDS.
Do NOT OPEN SDS with a pressure higher than the maximum pressure of the
Q-RPT applied to the TEST port. Damage to the Q-RPT may result.