Page 1 RPM4-AD™ Reference Pressure Monitor, Air Data Version Operation and Maintenance Manual © 2005-2007 DH Instruments, a Fluke Company...
Page 2 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.
Page 3: Table Of Contents
O P E R A T I O N ..............1 3 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 Page I © 2005-2007 DH Instruments, a Fluke Company...
Page 4 [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...
Page 5 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 Page III © 2005-2007 DH Instruments, a Fluke Company...
Page 7: Tables
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.
Page 8 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 ©...
Page 9: A B O U T T H I S M A N U Al
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.
Page 11: I N T R O D U C T I On
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.
Page 12: Specifications
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.
Page 13: Table 1. Quartz Reference Pressure Transducer (Q-Rpt) Module Designations And Ranges
Allows operation ± 20° from reference plane without significant effect Predicted Stability ± 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)
Page 14: On-Board Barometer
Battery Voltage 12 VDC Battery Capacity Typical: 9000 mAh Min: 8200 mAh Full charge from empty, 14 to 16 hours approx. Charge Time 8 to 12 hours Approx. Run Time, Full Charge © 2005-2007 DH Instruments, a Fluke Company Page 4...
Page 15: 2. Installation
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.
Page 16: 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.
Page 17: Rear Panel
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.
Page 18: Remote [Ent] Connection (Footswitch Or Other Switch)
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.
Page 19: The Vent And Atm Ports
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.
Page 20: 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).
Page 21: Short Term Storage
2. INSTALLATION The value indicated should be near zero. It is normal for RPM4-AD to indicate a value other than zero when vented when gauge mode is first entered or the range is changed. Press [AutoZ]. This runs AutoZ to zero the Q-RPT reading (see Section 3.3.9.1).
Page 23: O P E R A T I O
Figure 3 and its legend summarize the RPM4-AD MAIN RUN screen fields and their functions. RPM4-AD has a screen saver function which causes the display to dim if no key is pressed for 10 minutes. Pressing a key restores full power to the display. The screen saver time can be changed or screen saving can be completely suppressed (see Section 3.5.5.1).
Page 24: Figure 3. Main Run Screen Display Fields
(<Lo> or <Hi> to right) <F> Display mode is FREEZE and value is last captured reading Blank, no character Current display mode is CLEAN Figure 3. MAIN RUN screen display fields © 2005-2007 DH Instruments, a Fluke Company Page 14...
Page 25: Function / Data Keypad Layout And Protocol
3. OPERATION 3.1.2 FUNCTION / DATA KEYPAD LAYOUT AND PROTOCOL The RPM4-AD has a function/data keypad for local operator access to direct functions, function menus and for data entry. 1. The Function/Data keys allow very commonly 3. The Menu/Data keys provide access to...
Page 26: Remote [Ent] (Enter) Footswitch
RPM4-AD has two Q-RPTs. In RPM4-AD A160K/A160K the two Q-RPTs have of the same range of 160 kPa absolute (23 psi). In RPM4-AD A350K/A160K the Hi Q-RPT has a range of 350 kPa (51 psi) and the Lo Q-RPT has a range of 160 kPa (23 psi). Position indication of the currently active Q-RPT is continuously displayed in the upper right hand corner of the MAIN RUN screen and most other screens.
Page 27: Gauge And Negative Gauge Measurement, Dynamic Compensation For Atmospheric Pressure
Generally, settings selected while one Q-RPT is active apply to that Q-RPT and not to the other Q-RPT. The Q-RPT specific settings are stored with the Q-RPT and recalled whenever the Q-RPT is made active. See Table 5 for a listing of RPM4-AD settings and to what level of RPM4-AD operation they are specific.
Page 28: Altitude And Airspeed Measurement
3.2.3 ALTITUDE AND AIRSPEED MEASUREMENT RPM4-AD is designed to support the measurement of altitude and airspeed with minimal uncertainty. See Section 3.2.3.1 for information on altitude and airspeed measurement with RPM4-AD A160K/A160K (rotary wing) and Section 3.2.3.2 for information on RPM4-AD A350K/A160K (fixed wing).
Page 29: Rpm4-Ad A350K/A160K (Fixed Wing)
3.2.3.2 RPM4-AD A350K/A160K (FIXED WING) RPM4-AD A350K/A160K has two Q-RPTs. A 350 kPa absolute Q-RPTs is in the HIGH RPT (Pt) position and a 160 kPa absolute is in the LOW RPT (Ps) position. Air data measurements are normally made in the following conditions: The two Q-RPTs are separated internally.
Page 30: Pressure Ready/Not Ready
Ready is indicated when the current stability (rate of change) of pressure is less than the stability limit. The user can set the stability limit (see Section 3.4.3). The ready indication is often used when comparing the RPM4-AD and a test device to indicate when a valid reading can be made.
Page 31: Differential Measurement Mode
SDS on both Q-RPTs and TEST ports, whether active or inactive, to be opened and closed directly (see Section 3.5.4.1). The SDS “full time on/off” function allows SDS to be opened permanently so the RPM4-AD can be operated as if SDS were not installed (see Section 3.5.4.2).
Page 32: Use Of The 12Vdc Battery/Charger Pack
OFF for 12VDC power to be output). When RPM4-AD is connected to both a 12 VDC source and an AC source, if the RPM4-AD power switch is OFF, the 12VDC source supplies the RPM4; if the RPM4-AD power switch is ON, the 12 VDC source is disconnected and the AC source supplies the RPM4-AD.
Page 33: Using Rpm4-Ad With A Ppc3 Controller/Calibrator
The function accessed is labeled on the bottom half of the key. Direct function keys are active whenever RPM4-AD is in its MAIN RUN screen. Table 6 summarizes the operation of the direct function keys.
Page 34: Direct Function Keys
The [RANGE] function key is used to specify which Q-RPT (and associated range and settings) is active. To streamline RPM4-AD operation, the [RANGE] key also provides simple shortcuts to the RPM4-AD configurations that support air data measurements. See Section 4.4.5 for procedures to accomplish the same air data setups as [RANGE] shortcuts using remote commands.
Page 35: Rpm4-Ad A160K/A160K (Rotary Wing)
Pressing [ESC] while in the RANGE function returns to the MAIN RUN screen without making any change. Q-RPT specific RPM4-AD operating settings are saved with the Q-RPT when another Q-RPT is made active (see Section 3.2.1, Table 5). When the Q-RPT is selected again, it has the same settings as it was left with.
Page 36: Rpm4-Ad A350K/A160K (Fixed Wing)
Selects Lo Q-RPT with all previous Active A160K settings for that Q-RPT. 60g/160a SECOND [RANGE] SELECTION: HI Q-RPT Selects Hi Q-RPT with all previous user Active A160K settings for that Q-RPT. 60g/160a © 2005-2007 DH Instruments, a Fluke Company Page 26...
Page 37: Unit]
Section 3.3.3 for information on setting measurement mode (absolute, gauge, differential) To change the unit of altitude displayed on the RPM4-AD bottom line with HL, absolute or Hi, absolute + differential (Hd) Q-RPT active, select [DISPLAY], <4PRT> to select the altitude unit for the bottom line display with HL, absolute or Hi, absolute + differential Q- RP Tactive.
Page 38: Table 7. Available Unit Of Measure Types By Active Q-Rpt And Measurement Mode
<d> 1. Altitude measured by Lo Q-RPT can be displayed while measuring airspeed. Internally, RPM4-AD always operates in Pascal (Pa), the SI unit of pressure. Values expressed in other units of measure are obtained by applying conversion or scaling factors to Pascal.
Page 39: Table 9. Default [Unit] Choices By Active Q-Rpt And Measurement Mode
Enter the desired temperature value. The default value for true airspeed air temperature is set in [SPECIAL], <6Punit> when the unit is set up (see Section 3.5.6). In RPM4-AD displays, calibrated airspeed units are represented in lower case (e.g. kts) and true airspeed units are represented in upper case (e.g. KTS).
Page 40: Mode]
For information on selecting the active Q-RPT, see Section 3.3.1. For selecting the unit of measure, see Section 3.3.2. PRINCIPLE RPM4-AD supports simple, one-step switching between different measurement modes: Absolute Measures pressure relative to vacuum (zero is hard vacuum). Range is from zero absolute to full scale.
Page 41: Differential Measurement Mode Operation
(see Section 3.2.3.1). Certain RPM4-AD settings, including AutoZ ON/OFF (see Section 3.5.1) are Q-RPT AND measurement mode specific. See Table 5 for a listing of settings and what they are specific to. 3.3.3.1 DIFFERENTIAL MEASUREMENT MODE OPERATION Differential mode operation is only available with the Hi Q-RPT (<Hi>) active...
Page 42 Exceeding the differential and/or absolute mode Hi Q-RPT UL causes the display of differential pressure to flash. The Lo Q-RPT UL provides an upper limit for the line pressure. © 2005-2007 DH Instruments, a Fluke Company Page 32...
Page 43: Autorange]
To run an automated leak check routine that measures the leak rate of the system connected to the RPM4-AD active TEST port(s). Also used to measure average rate of change over a specified time period as required to evaluate the rate of change of altitude set by an air data test set.
Page 44: Display]
To view the results of the most recently completed test, press <2view>. If NO test data is stored (i.e., if the RPM4-AD has never run a leak test or a reset has cleared previous results), the results screen displays <Data NOT available> briefly and returns to MAIN RUN screen.
Page 45 It is often used as an indication of positive or negative leak rate and as a go/no go criterion of when to take data when comparing RPM4-AD and a device under test, for example in a calibration. Rate is used by the Ready/Not Ready function to determine when a Ready condition exists (see Section 3.2.4).
Page 46: Avg (Average)
Current rate of change of pressure in pressure units/second. R 0.0025 18Avg Countdown in seconds until completion of on- going averaging period. The [+/-] key toggles between the MAIN RUN Average screen and the instantaneous values Average screen. © 2005-2007 DH Instruments, a Fluke Company Page 36...
Page 47: Rate
(see Sections 3.4.3 and 3.2.4). The Rate DISPLAY only causes the current rate of change to be displayed and has NO affect on the stability setting or the Ready/Not Ready condition. Page 37 © 2005-2007 DH Instruments, a Fluke Company...
Page 48: Dev (Deviation)
DISPLAY is active the target value remains at the same numerical value. It is NOT converted. To go to a DISPLAY other than Deviation, press [DISPLAY] and make a new DISPLAY choice (see Section 3.3.6). © 2005-2007 DH Instruments, a Fluke Company Page 38...
Page 49: Rpt
“active” Q-RPT. The other Q-RPT to be displayed on the second (bottom) line of the RPM4-AD display is referred to as the “inactive” Q-RPT. It is “inactive” in the sense that all RPM4-AD functions and settings such as UNIT and RES still apply to the “active”...
Page 50: Hi/Lo
See Section 3.3.6, Principle.. OPERATION To activate the Hi/Lo DISPLAY press [DISPLAY], <5Hi/Lo>. Pressing <5Hi/Lo> resets the Hi/Lo values and returns to the MAIN RUN screen with the Hi/Lo DISPLAY active. © 2005-2007 DH Instruments, a Fluke Company Page 40...
Page 51: Freeze
[ENT] was pressed (displays 0.00 by default when Freeze DISPLAY is first activated). Pressing [ENT] causes the current measurement of the active RPM4-AD Q-RPT to be captured and displayed. If the measurement unit or mode is changed while the Freeze DISPLAY is active, the Freeze value defaults back to zero.
Page 52: Clean
TEST ports and the pressure at the device under test which is at a different height. In this case, it is useful to make a head correction to the pressure measured by the RPM4-AD in order to predict the pressure actually applied present a different height.
Page 53: Sds] (Self Defense System)
SDS can be set to permanently be OPEN as if no SDS were installed (see Section 3.5.4.2). PRINCIPLE SDS is a self defense system to protect RPM4-AD Q-RPTs from overpressure. CLOSES automatically to protect a Q-RPT that is not active. Activating an individual Q-RPT automatically CLOSES SDS on the other Q-RPT.
Page 54 The [SDS] key is used to OPEN SDS. The SDS function can also be used to CLOSE SDS as might be desired when leaving RPM4-AD at rest, when a possible overpressure situation is anticipated or anytime it is desirable to shut off the TEST port and vent the Q-RPT.
Page 55: Sds In Differential Measurement Mode
TEST port’s Q-RPT. Differential measurement mode (see Section 3.2.6) makes measurements using the RPM4-AD’s two Q-RPTs independently. In this mode, the function of the [SDS] key is adapted to facilitate dual Q-RPT operation. [SDS] can OPENS SDS on both the active an inactive Q-RPTs at the same time.
Page 56: Sds In Parallel Measurement Mode, Rpm4-Ad A160K/A160K Only
SDS for the TEST port that is used for the active measurement mode. In parallel measurement mode (see Section 3.2.5), the RPM4-AD’s two RPTs are connected to one TEST port by the internal bypass valve. Only one TEST port is used depending on the measurement mode.
Page 57: Autoz]
MAIN RUN screen. To be sure the Q-RPTs are really open to zero gauge pressure, SDS may be closed to shut the Q-RPTs off from the TEST ports and open vent them to atmosphere. Page 47 © 2005-2007 DH Instruments, a Fluke Company...
Page 58: Autoz] In Absolute Mode
Before running AutoZ in gauge mode, ensure that the pressure applied to the Q-RPT is truly zero gauge (atmospheric pressure). If running AutoZ in gauge mode results in a zero offset that RPM4-AD considers unusually large, <Confirm 0 gauge P!> is displayed when AutoZ is pressed. Check that zero gauge pressure is applied to the TEST port(s) and press ENTER to continue or ESCAPE to abort.
Page 59 (see Section 3.5.1, PRINCIPLE) to be std,0 entered directly from the RPM4-AD front panel. This provides a simple way of AutoZeroing relative to an independent reference device such as a house barometer that does not interface directly with RPM4-AD. To access run AutoZ by entry press [AutoZ], <1entry>. The display is:...
Page 60 RPM4’s COM2 communications port. Observe the displayed pressures and verify that they are stable. When ready, press [ENT] to cause AutoZ to run. RPM4-AD logs both readings and calculates a new AutoZ offset value. The display is: Old P : 0.0 Pa...
Page 61: Autoz In Differential Mode
Run AutoZ by Lo RPT AutoZ by Lo RPT is available only if the active Q-RPT is the Hi Q-RPT. AutoZ by Lo RPT allows the Lo Q-RPT in an RPM4-AD to serve as the AutoZ reference (source of P ) (see Section 3.5.1,...
Page 62: Ent]
[AZ] mode and to press [AutoZ] when ready. Note that the RPM4-AD bypass valve is open so the two Q-RPTs are exposed to the same pressure. Adjust the pressure to the desired line pressure value (in the case of airspeed measurement, adjust the pressure to the desired altitude value, this is the altitude at which airspeed will be measured after AutoZ).
Page 63: Setup]
3. OPERATION [SETUP] PURPOSE [SETUP] accesses a menu of functions and features commonly used in setting up and using RPM4-AD. OPERATION 1range 2res 3stab To access the SETUP menu, press [SETUP] from the MAIN RUN screen. The display is: 4UL 5ATest SETUP menu choices include: <1range>...
Page 64: 3Stab
See Section 3.2.4 Pressure Ready/Not Ready Indication. PRINCIPLE RPM4-AD continuously monitors the rate of change of pressure measured by the active Q-RPT and compares this rate to the stability limit to make a Ready/Not Ready determination (see Section 3.2.4 Pressure Ready/Not Ready Indication). The stability function allows the stability limit to be adjusted by the user to increase or decrease the stability required for a Ready condition to occur.
Page 65: 4Ul> (Upper Limit)
This feature is often used to help protect an external device or system on which RPM4-AD is being used to measure pressure. For example, it might be set just over the full scale of a device under test (DUT) that is being calibrated.
Page 66: Over Pressure Function
3 seconds on/2 seconds off intervals. Change the pressure applied to RPM4-AD so that it is within the upper and/or lower limit to return to normal operation. Upper limit values are specific to each range and measurement mode. Be careful not to assume that the upper limit set in one measurement mode will apply to the other.
Page 67: 1Autoz
(36 ºF) in absolute mode. PRINCIPLE AutoZ Purpose and Principle The main component of the change over time of the RPM4-AD Q-RPTs is change in zero or offset, independent of span. Offsetting or “rezeroing” RPM4-AD Q-RPTs relative to a reference between recalibrations allows measurement uncertainty specifications to be maintained with less frequent full calibrations.
Page 68 Q-RPT reading (P ) and the AutoZ standard offset ). This value is used to correct the RPM4-AD Q-RPT so it agrees with the AutoZ std,0 standard. The AutoZ function manages the determination, storage and application of P offset to correct the Q-RPT in absolute, gauge and differential measurement modes.
Page 69: Table 11. Autoz On And Off
Recommendations for the Use of the AutoZ Function The AutoZ function provides a powerful and easy to use tool for improving the stability over time of RPM4-AD Q-RPTs and maximizing the recalibration interval by compensating for zero drift between full recalibrations.
Page 70 To assure operation within measurement uncertainty specifications (see Section 1.2.2.1), run AutoZ whenever vented in gauge mode, whenever the line pressure is changed in differential mode and at least every 30 days or when RPM4-AD has been exposed to temperature changes exceeding 15 ºC (36 ºF) in absolute mode.
Page 71: Edit Autoz
COM1 and COM2 communications. To select the remote programming communications format. PRINCIPLE The RPM4-AD has two RS-232 communications ports referred to as COM1 and COM2 and a single IEEE-488 (GPIB) port. COM1 or the IEEE-488 port is for communicating with a host computer (see Section 4), and COM2 is reserved for communicating with an external device (e.g.
Page 72: 1Com1, 2Com2
The user can also specify one or two termination characters as well as define these characters. These are referred to as “Term1” and “Term2”. These define the characters that mark the end of commands that are sent to the RPM4-AD. The RPM4-AD looks for an ASCII(13) (carriage return) to terminate a received command but responds with both and ASCII(13) (carriage return) and an ASCII(10) (line feed).
Page 73: 5Rs232 Self-Test
3. OPERATION 3.5.2.4 <5RS232 SELF-TEST> The RS232 self-test is provided to check the RPM4-AD COM ports and the interface cable independently of an external device or computer. If you are having difficulty communicating with RPM4-AD from a host computer using RS232, the RS232 self test can help establish that the RPM4-AD COM1 port you are trying to communicate with and the interface cable you are using are good.
Page 74: 4Sds
SDS on either the Hi or Lo Q-RPT (see Section 3.5.4.1), and; b) turning OFF SDS so that it is open full time and RPM4-AD can be operated as if SDS were not installed (see Section 3.5.4.2).
Page 75: 2Full Time On/Off
Ps and Pt port depending upon measurement mode (see Section 3.2.5). 3.5.5 <5PREFS> PURPOSE To access a menu of RPM4-AD operational preferences and functions. OPERATION 1ScrSvr 2sound 3time To access the PREFS menu press [SPECIAL], <5prefs>. The display is:...
Page 76: 1Scrsvr
To adjust or suppress the RPM4-AD valid key press sound. PRINCIPLE RPM4-AD provides audible feedback by a brief “beep” when a valid key press is made. The tone frequency of this beep may be selected from three choices or it may be completely suppressed.
Page 77: 3Time
TIME and DATE function to set your local time and date. 3.5.5.4 <4ID> PURPOSE To view or edit the RPM4-AD user ID and to view the RPM4-AD serial number. OPERATION To access the ID function press [SPECIAL] and select <5prefs>, <2ID>. Select <1view> to view the current ID.
Page 78: 5Level> (Security)
For these reasons, depending upon the application in which RPM4-AD is being used, it may be desirable to restrict access to some functions. The user level function provides a means of restricting access to certain functions.
Page 79: Table 12. Security Levels
[SPECIAL], <8cal>, <2edit> under any selection [SPECIAL], <4reset> • • • • • [SPECIAL], <4reset>, <4cal> • • • [SPECIAL], <4reset>, <5all> • Remote communications disabled “•” indicates the function/menu is NOT accessible. Page 69 © 2005-2007 DH Instruments, a Fluke Company...
Page 80: 6Punit
Q-RPT and measurement mode (see Section 3.3.2 and Table 9, Table 10). RPM4-AD also supports many commonly used units that are not included in the default set up. These units can be made available for active selection by customizing the UNIT function using [SPECIAL], <6PresU>.
Page 81: Table 13. Available Unit Of Measure Types By Active Q-Rpt And Measurement Mode
3. OPERATION to support his/her six most commonly used units. This allows RPM4-AD to offer a very wide selection of units without having to deal with a long unit list in day to day operation. OPERATION WITH RPM4 A160K/A160K To customize the [UNIT] function key, press [SPECIAL], <6PresU> from the MAIN RUN screen.
Page 82: Table 14. Unit Function - Available Units Of Measure
The user defined unit label can be customized to any alphanumeric, four character label using the remote command “UDU” (see Section 4.4.4). See Section 7.2 for information on the unit of measure conversions used by RPM4-AD. © 2005-2007 DH Instruments, a Fluke Company...
Page 83: Table 15. Available Unit Of Measure Types By Active Q-Rpt And Measurement Mode
Hi absolute mode Enter the number of the unit position on the UNIT function menu that you would like to change. The next display lists the type of measurement units supported by RPM4-AD. Unit#6 1SI 2other Select the unit type. <SI> and <other> are pressure 3altitude 4airspeed units.
Page 84: 7Internal
<Set up unit #n> screen. The user defined unit label can be customized to any alphanumeric, four character label using the remote command “UDU” (see Section 4.4.4). See Section 7.2 for information on the unit of measure conversions used by RPM4-AD. 3.5.7 <7INTERNAL>...
Page 85: 2Readrt
3. OPERATION See Section 5.5, Figure 7 and Section 5.6, Figure 8, Figure 9 for a photo and schematics showing the position of the on-board barometer in RPM4-AD. The on-board barometer is a low accuracy sensor used only for measuring small changes in atmospheric pressure over short periods of time (see Section 3.2.2).
Page 86: 3Rpt2X
<5LOG> PURPOSE To view and/or clear the RPM4-AD event log. PRINCIPLE RPM4-AD records to a log each time one of the following events occurs: • Pmax! of an internal RPM4-AD Q-RPT or utility sensor is exceeded (see Section 3.4.4.1). •...
Page 87: 8Cal
This clears any settings that the user has made, and should be used only to restore the RPM4-AD to a known state. RPM4-AD goes through its power up sequence after any type of reset is executed.
Page 88: 1Sets
Sets the user defined unit to 1.000/Pa (see Section 3.5.6). Sets the reference temperature for inWa unit to 20°C. Sets the reference temperature for true airspeed units to 15°C. 3.5.9.3 <3AT > This function is not used in RPM4-AD models. © 2005-2007 DH Instruments, a Fluke Company Page 78...
Page 89: Cal
The Reset - Cal function will reset Q-RPT, utility sensor and barometer calibration coefficients and settings and reset AutoZ values to zero. This will change the RPM4-AD calibration and could cause it to make out of tolerance measurements. Clears all user values affecting the calibration of Q-RPTs and the on-board barometer.
Page 91: Overview
Sending a program message to the RPM4-AD places it into remote mode. The remote indicator to the right of the display window lights when the RPM4-AD is in remote mode. It also flickers when a program message is received. The menus usually accessed from the front panel are locked out while in remote.
Page 92: Ieee-488
The main difference between the “classic” and “enhanced” formats is that when using the IEEE-488 interface, a query operator “?” must be included in an enhanced command to yield a reply from the RPM4-AD. When using the COM1 port in classic or enhanced mode or using the IEEE-488 port in classic mode, every command has a reply which the host must wait for before continuing.
Page 93: Classic Program Message Format
Each program message sent is also a query. You can only send one program message to the RPM4-AD at time. After sending any program message, you must wait for the RPM4-AD to reply before sending another program message. This reply will contain data, or a numeric error message if the program message was invalid.
Page 94: Using Query Type Commands
You must wait for a reply with a query. If you send any type of program message to the RPM4-AD after a query before receiving a reply, the program message is discarded and an error is generated. Errors are reported using the IEEE Std.
Page 95: Commands
“2” in some commands. The “RANGE” command can be used to select the “Active” Q- RPT. There are some limitations to use of the suffix when the RPM4-AD is in differential mode (see Section 3.2.6) or the “HL” Q-RPT is active (see Section 3.2.5). See the program message descriptions for suffix use with a specific command.
Page 96: Error Messagess
ERR #52 “Command obsolete” ERR# 53 “Not Available” ERR# 60 “Air data unit of measure not compatible with measurement mode” (e.g. airspeed in absolute mode, altitude in mode other than absolute) © 2005-2007 DH Instruments, a Fluke Company Page 86...
Page 97: Program Message Description Overview
This is the Classic program message syntax to send data to the RPM4, to execute an RPM4-AD function, or to query for data. The RPM4-AD must be set to use the classic format (see Section 3.5.2.3). The command may be followed by a ‘(=)’ and additional argument characters to show that argument(s) can be passed.
Page 98: Program Message Descriptions
RPM4-AD™ OPERATION AND MAINTENANCE MANUAL 4.4.4 PROGRAM MESSAGE DESCRIPTIONS Purpose To allow the host PC to communicate with a device connected to the RPM4-AD COM2 port. Classic “#xx” Arguments The string to send out of the RPM4-AD COM2 port. It must be less than 40 characters long.
Page 99 4. REMOTE OPERATION Remarks The RPM4-AD AutoZ function can be turned ON and OFF. There is a separate AutoZ flag for the gauge, absolute, and differential measurement modes for each Q-RPT. This command sets the AutoZ status for the current mode of the specified or the active Q-RPT only. To set the state of AutoZ for a measurement mode, you must be in that mode.
Page 100 The COM1 port is used to communicate to the RPM4-AD. When the COM1 port configuration of the RPM4-AD is changed, the program message reply (COM1 use only) is sent at the old COM1 settings, but all subsequent communications are accomplished at the new COM1 settings.
Page 101 Specify the HL Q-RPT if the HL Q-RPT is active Remarks This command is somewhat different than most as it enables the RPM4-AD to continuously output the selected Q-RPT’s measurement without further queries. This continues until the next query is received by the RPM4, or if the ABORT”...
Page 102 This must be “N2”, “AIR” or “HE”. Command is case sensitive. Remarks The RPM4-AD can make a gas head correction to allow it to display the pressure at a level other than the reference level of the RPM4-AD. Example Cmd sent: “HEAD? 10,in,N2”...
Page 103 Remarks The user can select the type of remote command format using these simplified commands. There is no query format. This format must agree with the format sent to the RPM4-AD. This command is a replacement for the “MSGFMT” command.
Page 104 Example Cmd sent: “MSGFMT? 1” (enhanced) Query reply: “1” Example Sent: “MSGFMT=1” (classic) Reply: “MSGFMT=1” Errors ERR# 6: Missing or improper program message argument(s). See Also “L2 / L3” 4.3, 3.5.2.3 © 2005-2007 DH Instruments, a Fluke Company Page 94...
Page 105 After receiving this program message, the RPM4-AD replies back with the data after a new pressure measurement cycle is complete. This can take up to the current read rate period (1.2 seconds by default).
Page 106 This is followed by the current pressure unit of measure. atm: The pressure measured by the RPM4-AD on-board barometer in the current pressure unit (and always absolute). This is followed by the current active Q- RPT’s pressure unit. If the current active Q-RPT pressure unit is an airspeed unit, then the barometer will be indicated in “feet”...
Page 107 RPT’s pressure unit. If the current active Q-RPT pressure unit is an airspeed unit, then the barometer will be indicated in “feet” Not all RPM4s are equipped with an on-board barometer. This field is missing if the RPM4-AD is not equipped with a barometer. If the Q-RPT’s measurement unit is in airspeed,...
Page 108 Remarks The next available pressure rate of change in the current pressure unit per second is returned. Though the RPM4-AD can set locally to display rate per minute, the response to the “RATE” command is always rate per second. After receiving this program message, the RPM4-AD replies back with the data once a new pressure measurement cycle is complete.
Page 109 “REMOTE” Remarks The RPM4-AD goes into remote mode whenever communications take place. The user can return to local operation by pressing the [ESC] key. The REMOTE program message locks out the front panel completely. The only way to unlock the front panel after the “REMOTE”...
Page 110 “RESET” Remarks The RPM4-AD has user settings (units, resolution, etc.) that can be reset to factory defaults. The remote “RESET” program message corresponds to the front panel “Reset - Sets”. System calibration coefficients and communications settings are not affected. The reset cycle takes up to 3 seconds to complete.
Page 111 Up to two (three including the HL Q-RPT which is a combination of the Hi and Lo) internal Q- RPTs can be available for use in an RPM4-AD. You can query the RPM4-AD for information about each particular Q-RPT. The Q-RPT data is returned in the following format:...
Page 112 SDS is closed. If a Q-RPT’s SDS is full time “OFF”, then it is not be affected by this command. The status of the active Q-RPT’s SDS system is replied. If the RPM4-AD is in differential mode then this command opens or close both the Hi and Lo SDS at the same time, unless the SDS is full time “off”.
Page 113 4. REMOTE OPERATION Purpose To read the serial number of the RPM4-AD. Query “SN?” Classic “SN” Remarks The RPM4-AD is serialized. The serial number can be read using this program message. Example Query sent: “SN?” (enhanced) Query reply: “321” Example Sent: “SN”...
Page 114 Specify the HL Q-RPT if the HL Q-RPT is active Remarks The RPM4-AD handles all pressure values internally in Pascal. The coefficient replied is equivalent of Pres Pa in the current pressure unit of measure. If the optional argument Pres is not given, then 1Pa is assumed and converted.
Page 115 Remarks The RPM4-AD has an upper limit for each range and for each measurement mode (gauge, absolute, and differential). If the pressure does exceed the upper limit, the pressure display flashes. This feature should always be used to prevent accidental over pressure of a device under test.
Page 116 The unit is invalid. ERR# 6: The ref is invalid. ERR# 20: Absolute measurement mode and altitude units are not allowed with a gauge Q-RPT. See Also “MMODE”, “MODE” 3.3.2, 3.3.3, 3.5.6, 7.2 © 2005-2007 DH Instruments, a Fluke Company Page 106...
Page 117: Remote Airdata Setup Procedures
“VER?” Classic “VER” Remarks The software version of the RPM4-AD can be read. This is useful for checking for the presence of the RPM4-AD and for reference purposes. It indicates the internal Q-RPT(s) and software version. Example Query sent: “VER?”...
Page 118: Status Reporting System
STATUS REPORTING SYSTEM The RPM4-AD status reporting system is used to track and report system status and errors. It follows the model of the IEEE Std 488.2 and works for the COM1 and the IEEE-488 port with slight differences. The RPM4-AD can be programmed to respond to various status conditions by asserting the SRQ of the IEEE-488 interface.
Page 119: Status Byte Register
4. REMOTE OPERATION 4.5.2 STATUS BYTE REGISTER The RPM4-AD contains an 8 bit Status Byte Register that reflects the general status of the RPM4-AD. Table 24. 8 bit status byte register OPER RQS/MSS ERROR (128) (64) (32) (16) This register is affected by the RPM4-AD reply output queue, the Error Queue, the Standard Event Status register and the Ready Event Status register.
Page 120: Standard Event Register
RPM4-AD™ OPERATION AND MAINTENANCE MANUAL Message Available Bit 4 (16) Indicates that at least one reply message is waiting in the RPM4-AD IEEE-488 output queue. ERROR Error Queue Not Empty Bit 2 (4) Indicates that at least one command error message is waiting in the RPM4-AD IEEE-488 error message queue.
Page 121: Ready Status Register
4. REMOTE OPERATION 4.5.4 READY STATUS REGISTER The RPM4-AD contains an 8 bit Ready Status Register that reflects specific RPM4-AD Q-RPT measurement ready events. Enabled events in this register will set or clear the RSB bit of the Status Byte Register.
Page 122: Ieee Std. 488.2 Common And Status Program Messages
IEEE STD. 488.2 COMMON AND STATUS PROGRAM MESSAGES The RPM4-AD supports a set of commands that are common to all instruments conforming to IEEE Std. 488.2. These commands make it easy to perform basic function for any device that supports these commands.
Page 123 (as if the “∗RST” program message was executed), and the ∗TST query will return a non zero value. If the RPM4-AD passed the test on power-up OR if the ∗TST query was used at least once since the RPM4-AD was powered up the reply will be a ‘0’.
Page 124 Read the Ready Status Register. Command “RSR?” Remarks The Ready Status Register contents are cleared after reading. The reply is in decimal numeric form. Example Sent: “RSR?” (enhanced) Reply: “6” (The MEAS and NRDY) © 2005-2007 DH Instruments, a Fluke Company Page 114...
Page 125: Maintenance, Adjustments A N D C A L I B R A T I O
For rapid assistance in specific situations see Chapter 6 for troubleshooting information. RPM4-AD is covered by a limited one (1) year warranty. Unauthorized service or repair during the warranty period is undertaken at the owner’s risk and may cause damage that is not covered under warranty and/or may void the warranty.
Page 126: Pa And Pm Coefficients
Each Q-RPT has its own unique PA and PM values. The PA and PM values currently in use can be viewed and edited from the front panel in the RPM4-AD CAL function (see Section 5.2.7). PA and PM values are automatically edited when CalTool software results are activated.
Page 127: Equipment Required
5.2.2 EQUIPMENT REQUIRED The recommended calibration standard for RPM4-AD Q-RPTs is a DHI PG7601 gas piston gauge or ADCS-601 air data calibration standard. Contact DHI for additional information. Gas operated piston gauge (deadweight tester), with the following characteristics: •...
Page 128: Rpm4 A350K/A160K (Fixed Wing)
RPM4 A350K/A160K (FIXED WING) To set-up and prepare an RPM4-AD A350K/A160K for calibration of its Q-RPTs: Set the RPM4-AD on a stable surface near the calibration standard at a height as close as possible to the calibration standard’s reference height.
Page 129: A350K Q-Rpt Calibration Sequence
262.5 (38.1) (50.8) 262.5 (38.1) 175 (25.4) Ascending 87.5 (12.7) Lowest pressure 1 kPa (0.15 psi) or the lowest point that can be set reliably by the reference piston gauge . Page 119 © 2005-2007 DH Instruments, a Fluke Company...
Page 130: Turning Off Absolute And Negative Gauge Measurement Modes
A user level security system is available to control access (see Section 3.5.5.5). A new RPM4-AD is delivered with PA and PM values set to zero and 1 for all ranges. This does not mean that the RPM4-AD has not been calibrated. In the original factory calibration, privileged factory coefficients are used for calibration with the user PA and PM set to zero and 1.
Page 131: Q-Rpt Calibration/Adjustment Without Caltool For Rpts Software
5.2.8 Q-RPT CALIBRATION/ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE PRINCIPLE The RPM4-AD Q-RPTs can be calibrated and adjustments made without using CalTool for RPTs software. This requires: • Applying pressures with a calibration standard and recording the pressures measured by RPM4-AD.
Page 132 Perform a linear regression to find the offset and slope that best fit the non-corrected RPM4-AD readings to the calibration standard pressures. The offset is the new value of PA, the slope is the new value of PM. Press [SPECIAL], <8Cal>, <1Hi RPT> or <2Lo RPT>, <2edit> and write the new calibration date and the new values of PA and PM for the Q-RPT(s) calibrated.
Page 133: Adjustment Of On-Board Barometer
MEMORY RPM4-AD uses FLASH memory. This allows the embedded software that controls RPM4-AD operations and functions to be loaded into RPM4-AD over its COM1 port from a computer with a simple FLASH loading utility program. To replace corrupted software or upgrade your software, access the DHI worldwide web site at www.dhinstruments.com and go to SOFTWARE.
Page 134: Subassembly Description And Location
The micro board supports a Motorola 68302 micro-controller, EPROM, EEPROM, 128k x 16 bit NVRAM, 8 Mbit flash memory; RS-232 and IEEE-488.2 communications; keypad and display control. An I/O port controls other ports and devices in RPM4-AD. 5.5.2 POWER SUPPLY MODULE + 12 V DC (±...
Page 135: Driver Board
The Q-RPT module is an integrated Quartz Reference Pressure Transducer (Q-RPT) assembly. The module includes a Q-RPT, brackets to hold the transducer, interconnecting tubing. RPM4-AD models use a single interconnection manifold for the two Q-RPT modules. The manifold includes the TEST(Ps), TEST(Pt), VENT ATM ports.
Page 136: Q-Rpt Module Pneumatic Schematic And Valve States
(airspeed at varying altitude) VALVE STATE VALVE STATE CONDITION CONDITION SDS Open SDS Open SDS Closed SDS Closed Power off Run AutoZ Figure 8. Pneumatic schematic and valve states, RPM4-AD A160K/A160K (rotary wing) © 2005-2007 DH Instruments, a Fluke Company Page 126...
Page 137: Rpm4-Ad A350K/A160K (Fixed Wing)
CONDITION CONDITION SDS Open SDS Open SDS Open SDS Closed SDS Closed SDS Closed Power off Power off Run AutoZ Figure 9. Pneumatic schematic and valve states, RPM4-AD A350K/A160K (fixed wing) Page 127 © 2005-2007 DH Instruments, a Fluke Company...
Page 139: T R O U B L E S H O O T I N
RPM4-AD operation. This troubleshooting guide is intended as an aid in identifying the reason for RPM4-D behavior and determining whether the behavior is due to normal operation or an internal or external problem.
Page 140 3.3.6 followed by <avg>. Purge and clean affected systems. Pressure measurement seems The RPM4-AD and/or the connection to the Contact DHI Authorized Service erratic when measuring gas test system is contaminated with liquids. Provider if RPM4-AD is contaminated pressure.
Page 141 Q-RPT. the RPT, OPEN SDS. 3.2.8, 3.3.8 indication. Familiarize yourself with your RPM4-AD RPM4-AD has two TEST ports and the configuration. Connect pressure to be pressure to be measured is connected to the measured to correct TEST port.
Page 143: Remote [Ent]
The RPM4-AD remote ENTER function operates by detecting the open or closed status of the REMOTE ENTER switch. The normal status of the ENTER switch is OPEN. When RPM4-AD detects a CLOSED condition held for 300 ms, it is interpreted as equivalent to a press of the [ENT] key.
Page 144: Unit Conversion
Geopotential Feet.” MIL-STD-859A provides tables of pressure in inches of mercury as a function of altitude in feet. RPM4-AD uses a set of equations to model the pressure/altitude relationship. The worst case deviation between the MIL-STD-859A table and the calculated pressure is 0.0001 inches of mercury (0.3 Pa).
Page 145: Airspeed
The Mach number times the speed of sound is the resultant air speed. In both cases, the resultant airspeed value is in meters per second. Length and time unit conversions are applied to yield all cases of airspeed units. Page 135 © 2005-2007 DH Instruments, a Fluke Company...
Page 146 Gas constant. 287.05287 j/(Kkg) γ Constant ratio of specific heats of air (1.400). Calculated Mach number as a function of static pressure. The input or calculated differential pressure converted into Pa. © 2005-2007 DH Instruments, a Fluke Company Page 136...
Page 147 Mach number starting with the Mach number calculated for the subsonic case. The iteration continues until the change in calculated Mach number between iteration cycles is less than 0.01 parts per million. For M<1 Page 137 © 2005-2007 DH Instruments, a Fluke Company...
Page 148 RPM4-AD™ OPERATION AND MAINTENANCE MANUAL For M>1 Start with M for the case in which M<1 © 2005-2007 DH Instruments, a Fluke Company Page 138...
Page 149: Overview
The provisions of this warranty and limitation may not be modified in any respect except in writing signed by a duly authorized officer of DH Instruments, a Fluke Company The above warranty and the obligations and liability of DH Instruments, a Fluke Company and its Authorized Service Providers exclude any other warranties or liabilities of any kind.
Page 150: Table 34. Dhi Authorized Service Providers
Peoples Republic of DH Products Technical Heat Division Tel 010.64218637 ext 5 China Service Division Pressure & Vacuum Lab Fax 010.64218703 NO. 18, Bei San Huan Donglu cxcen@mx.cei.gov.cn Beijing 100013 PR CHINA © 2005-2007 DH Instruments, a Fluke Company Page 140...
Page 151 Absolute Mode Measurement mode in which the Q-RPT indicates absolute pressure (difference from vacuum). The Q-RPT that is currently selected to be displayed on the top line of the RPM4-AD Active Q-RPT display. Most function selections affect the active Q-RPT.
Page 152 PPC3. PPC3 automates RPM4-AD pressure control. The transducer used by RPM4-AD for low uncertainty pressure measurement. May be designated as Hi, Lo or HL depending on its position and role in t he RPM4-AD. Q-RPT...

Fluke RPM4-AD Operation And Maintenance Manual

Tables

A B O U T T H I S M a N U al

1 Introduction

2 Installation

3 O P E R a T I O

4 Remote Operation

5 Maintenance, Adjustments a N D C a L I B R a T I O

6 T R O U B L E S H O O T I N

7 A P P E N D I

8 Warranty

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Summary of Contents for Fluke RPM4-AD

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