Page 2 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, COMPASS, PPC, PPC4, Q-RPT, RPM, RPM4, SDS and SPLT are trademarks, registered and otherwise, of DH Instruments, a Fluke Company.
Page 3: Table Of Contents
O p e r a t i n g P r i n c i p l e s ............1 7 User Interfaces ............................. 17 General Operating Principles ......................17 Page III © 2009 DH Instruments, a Fluke Company...
Page 4 Interrupting Automated Pressure Control ..................... 62 4.2.1.2 Automated Pressure Commands for Zero Pressure ................62 4.2.2 Vent ................................. 63 Basic Interface menus ......................... 63 4.3.1 Main Menu Tree ............................63 Menu Tree Operation ........................... 64 © 2009 DH Instruments, a Fluke Company Page IV...
Page 5 Automated Pressure Commands for Zero Pressure ................94 5.5.2 Manual Pressure Control ........................94 5.5.3 Vent ................................. 95 Advanced Interface Menus ........................95 5.6.1 Shortcuts ..............................95 5.6.2 Menu Structure ............................95 Page V © 2009 DH Instruments, a Fluke Company...
Page 6 Programming Formats ........................137 6.4.1 Classic Program Message Format .......................137 6.4.2 Enhanced Program Message Format ....................137 6.4.2.1 Using Command Type Commands .....................138 6.4.2.2 Using Query Type Commands ......................139 Commands ............................139 © 2009 DH Instruments, a Fluke Company Page VI...
Page 7 Pneumatic Control Module Configuration ..................197 7.5.1 Basic Interface Operation ........................198 7.5.2 Advanced Interface Operation ......................199 Reloading Embedded Software into Flash Memory ................ 199 Removing the PPC4 Cover ........................ 200 Overhaul .............................. 200 Subassembly Description and Location ..................201 7.9.1 Power Supply Module ...........................202 7.9.2 PowerPC Board .............................202...
Page 9: Tables
Table 1. Reference Pressure Transducer (Q-RPT) Designations and Ranges ........... 2 Table 2. PPC4 Packing List.......................... 5 Table 3. Position Designators of Q-RPTs in a PPC4 System ..............23 Table 4. Settings and What They Are Specific To (Range, Measurement Mode, Q-RPT, System) ..24 Table 5.
Page 10 PPC4™ OPERATION AND MAINTENANCE MANUAL Figures Figure 1. PPC4 advanced interface front panel ................... 7 Figure 2. PPC4 basic interface front panel ....................7 Figure 3. Rear panel with optional connectors ..................... 8 Figure 4. Dynamic Pressure Control Operation ..................18 Figure 5.
Page 11: About This Manual
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 PPC4 users. Section 4 is important for those needing to communicate in local mode with the Basic user interface. Section 5 is important for those using the Advanced user interface.
Page 12  Caution “Caution” is used in throughout the manual to identify conditions or actions that could cause harm to the PPC4 or to the devices that are connected to the PPC4.  Warning “Warning” is used in throughout the manual to identify actions that could pose a hazard to the user of the PPC4.
Page 13: Introduction
ASCII character command strings over RS232, IEEE-488.2 or Ethernet. PPC4 models are available to measure and control pressure in ranges from as low as - 3 to 3 kPa (0.4 psi) to as high as 0 to 14 MPa (0 to 2 000 psi) in absolute, gauge and compound gauge measurement modes.
Page 14: Pressure Measurement Specifications
Quartz reference pressure transducers (Q-RPTs) can be installed in PPC4 to obtain low uncertainty pressure measurement. One or two Q-RPTs can be included in the PPC4 and/or additional Q-RPTs can be used externally mounted in a DHI RPM4 Reference Pressure Monitor (see Section 3.2.5).
Page 15: M A I N T E N A N C E , Ad J U S T M E N T S A N D C A L I B R A T I O
160 kPa maximum Q-RPT span), the measurement uncertainty in pressure is measured pressure x 0.008% to 14.4 kPa (160 kPa maximum Q-RPT span x 9%) and 0.0012 kPa (160 kPa maximum Q-RPT span x 9% x 0.008%) under 14.4 kPa. Note: DHI technical note 8050TN11 provides a detailed description of PPC4 Q-RPT uncertainties. Page 3...
Page 16: Utility Sensor
1.2.2.2 Utility Sensor The PPC4 may be configured with a Utility sensor instead of a Hi Q-RPT. Utility sensors are used for pressure control, system monitoring and safety functions. They are intended for indication only, not to provide reference pressure measurement.
Page 17: Installation
Unpacking And Inspection 2.1.1 Removing From Packaging PPC4 is delivered in a corrugated container with suspension packaging; or in an optional molded shipping case with custom foam inserts. Remove the PPC4 and its accessories from the shipping container and remove each element from its protective plastic bag.
Page 18: Site Requirements
The PPC4 can be installed on any flat, stable surface at a convenient height. The front feet can be extended so that the unit can be inclined for easier viewing. The PPC4 can also be mounted in a standard 19 in. rack using the optional rack mount kit.
Page 19: Front And Rear Panels
Display Select and Enter knob   Multi-function keypad Remote activity indicator   Vent Indicator USB connection Figure 1. PPC4 advanced interface front panel   Ready/Not Ready indicator Direct pressure control keys   Display Vent Indicator ...
Page 20: Rear Panel
Connecting To A Pressure Supply (Supply Port) Using a pressure connecting hose or tube of appropriate pressure rating, connect the pressure supply to the SUPPLY port on the rear panel of PPC4. The PPC4 SUPPLY port connection is 1/8 in. NPT female.
Page 21: Connecting A Vacuum Pump (Exhaust Port)
TEST port and the remote Q-RPT are added, the possibility of difficulty with pressure control when using the external Q-RPT increases. To connect a PPC4 to an RPM4 to be used as part of the PPC4 system, proceed as follows: Note...
Page 22: Connecting To The Device Under Test (Test(+) And Test(-) Ports)
If you are using a self purging liquid trap (SPLT), see Section 2.3.7.1 before proceeding to connect the device under test. If the PPC4 has a G15K or BG15K Q-RPT, a dual volume unit (DVU) should be installed for very low pressure control. See Section 2.3.2.2 before proceeding to connect to the device under test.
Page 23 When operating in gauge or negative gauge mode with a range less than 50 kPa (7.5 psi): As a general rule, it is preferable to connect the PPC4 TEST(-) port(s) directly to the low or reference side of the device under test to ensure that these are at the same pressure.
Page 24: Installing A Self Purging Liquid Trap (Splt)
2.3.8 The ATM Port The PPC4 ATM port is the system vent to atmosphere point used to set zero gauge pressure as well as to obtain Q-RPT measurements of atmospheric pressure. Though a pressure hose can be connected to the ATM port to direct the vented gas flow, a completely unobstructed connection to atmosphere must be maintained for PPC4 reference pressure measurements to operate normally.
Page 25: Turn Off Absolute And Negative Gauge Mode (Axxx Rpt)
Turn Off Absolute And Negative Gauge Mode (AXXX RPT) If your PPC4 has an Axxx (absolute) Q-RPT, it is able to operate in gauge, negative gauge and absolute measurement modes (see Section 3.2.11). If the PPC4 will be used only in gauge mode, the other measurement modes can be turned off so they are no longer accessible.
Page 26: Checking Gauge Mode Pressure Measurement
Main Menu to change the pressure unit if desired (see Section 3.2.10). Observe that, within ten seconds, zero is indicated. It is normal for PPC4 to indicate a value other than zero for up to ten seconds when first entering gauge mode.
Page 27: Leak Test
PPC4 TEST(+) port. PPC4 should set the target pressure and indicate Ready (see Section 3.2.3) continuously in 15 to 60 seconds. If it does not, see Section 8 to troubleshoot.
Page 28: Short Term Storage
Shut OFF or disconnect the pressure supply. Shut OFF or disconnect the vacuum supply. Be sure the pressure supply is disconnected or the vacuum pump is bypassed from the PPC4 EXHAUST port before turning OFF the vacuum pump. © 2009 DH Instruments, a Fluke Company...
Page 29: O P E R A T I N G P R I N C I P L E
During active pressure control, they cause the target pressure to be changed by the fixed amount. One press causes one step. The approximate value of the step is set automatically depending on the current active PPC4 range. The value can be adjusted with the Jog function (see Section 3.2.19).
Page 30: Dynamic Control
Pressure control parameters for each control mode are automatically set to optimal default values for the operating PPC4 range when the range is selected or AutoRange is used (see Section 3.2.8). Control parameters can be customized using screen selections (see Section 4.4.5.1 for Basic Interface and Section Section 5.7.8.2.1...
Page 31: Static Control
Figure 5. Static Pressure Control Operation 3.2.3 Pressure Ready/Not Ready There is a Ready/Not Ready indicator on the PPC4 front panel. This indication is intended to provide the user with a clear and objective criterion for determining when a valid pressure measurement can be made.
Page 32: Figure 6. Ready/Not Ready In Dynamic Pressure Control Mode
NO control valve is operating. • The current measured pressure is at the target value within the hold limit. • The rate of change of pressure is less than the current stability limit. © 2009 DH Instruments, a Fluke Company Page 20...
Page 33: Gauge And Negative Gauge Modes With An Axxx (Absolute) Q-Rpt, Dynamic Compensation For Atmospheric Pressure
AutoZ routine that measures P , is run offset,G automatically whenever the PPC4 is in the vented condition. This ensures the continuous automated updating of the P value corresponding to atmospheric pressure. Gauge pressure offset,G is the measured absolute pressure, P , minus the atmospheric offset.
Page 34: Multiple Internal And External Q-Rpts
Pressure Transducers (Q-RPT). Up to four Q-RPTs can be included in a PPC4 pressure controller/calibrator system. One or two Q-RPTs can be built into the PPC4, up to two may be located outside the PPC4 enclosure, in an RPM4 reference pressure monitor (one or two in the RPM4).
Page 35: Multiple Ranges (Q-Rpts, Autorange And Infinite Ranging)
A PPC4 range is defined as a pressure span and associated settings. A PPC4 may have multiple ranges. Each Q-RPT (and the utility sensor, if present) available to the PPC4 system has a default range which is its maximum span. Additional ranges, lower than the Q-RPT’s maximum span, may be created using AutoRange (see Section 3.2.8).
Page 36: Operation With A Pg7000 Piston Gauge
 PRINCIPLE PPC4 is designed to support the calibration and test of a very wide variety of test ranges in various measurement modes with a single pressure controller system. The AutoRange function simplifies the task of selecting the Q-RPT best suited to cover a specific test range and setting controller parameters appropriately for the range.
Page 37: Table 5. Settings Made By Autorange
100 ppm of AutoRanged span 3.2.20 Q-RPT turn down Turn down Q-RPT See Premium Q-RPT pressure 1.2.2.1 (Premium class Q-RPTs only) characterization to improve measurement specifications measurement uncertainty when span is reduced Page 25 © 2009 DH Instruments, a Fluke Company...
Page 38 <PPC EXT DEV: ACTIVE> (if RPM4 is initialized by PPC4 and is currently in use) • After using an RPM4 as an external device for a PPC4, cycle power to return to the previous RPM4 settings, restore front keypad capability and return to the normal Main Run Screen.
Page 39: Range
A PPC4 range is defined as a pressure span and associated settings (see Section 3.2.8). A PPC4 may have multiple ranges. Each Q-RPT (and the utility sensor if present) available to the PPC4 system has a default range which is its maximum full scale. Additional ranges, lower than the Q-RPT’s full scale, may also be created using AutoRange (see Section 3.2.8).
Page 40: Measurement Mode
Section 3.2.11.  PRINCIPLE PPC4 allows the unit of measure in which pressure values are displayed to be changed. PPC4 supports 18 predefined pressure units of measure as well as up to five user defined units. See Table 35, Section 9.2.1, for a listing of the available units of measure and the...
Page 41: Set Pressure Automatically
3.2.12 Set Pressure Automatically  PURPOSE To use the automated pressure control functions of PPC4 to set and maintain target pressure values.  opens the target screen to initiate the sequence. Page 29 © 2009 DH Instruments, a Fluke Company...
Page 42: Control
When a control mode is selected using the Control function, Control parameters are automatically set to default values for the active range (see Table 6 for definition of PPC4 default control parameters). The default control parameters have been determined to be ©...
Page 43: Vent
3. OPERATING PRINCIPLES most suitable for the typical user to operate within PPC4 pressure control and measurement specifications. Each PPC4 default range has default control parameters and AutoRange automatically sets control parameters appropriate for the AutoRange range. Control mode parameters can be viewed and customized in the Control function (see Section 5.7.8 in the Advanced Interface and Section 4.4.5 in the Basic Interface).
Page 44: Head
 is used to advance to the next test point. Following the completion of the test the PPC4 values for all of the test points are displayed in a list. If the user is calibrating an analogue device, such as a gauge, the user can adjust the PPC4 pressure to set cardinal points on the analogue device before advancing to the next pressure.
Page 45: Purge
PPC4 in order to predict the pressure actually applied at a different height. PPC4 can calculate head pressures for nitrogen, helium and air as the test gas over its working pressure range. The HEAD function allows the height difference to be specified and causes the resulting head pressure to be added to the pressure measured at the TEST port.
Page 46 Pressure control stops and a 5 second wait occurs. SPLT exhaust valve is opened. PPC4 waits until pressure is less than 20 kPa (3 psi) gauge or 110 kPa (16 psi) absolute. PPC4 internal vent valve is opened with the SPLT exhaust valve left open.
Page 47: Leak Test
PPC4 Q-RPTs and pressure in other parts of the test system. A large leak can cause the PPC4 to be unable to set and control pressures reliably. The LEAK CHECK function is provided as a means of checking and quantifying the leaks that may be present in the system.
Page 48: Jog
To set the upper and lower limit pressure value for a pressure range and measurement mode.  PRINCIPLE The Upper Limit function allows the setting of a maximum pressure not to be exceeded when using a specific range and measurement mode. Absolute and gauge measurement modes © 2009 DH Instruments, a Fluke Company Page 36...
Page 49: 3.2.21.1 Over Pressure Function
Automated pressure control targets greater than the upper limit or lower than the lower limit are not accepted. When the pressure measured by PPC4 exceeds the upper limit or lower limit, automated or direct manual pressure control is aborted and an intermittent warning beep sounds.
Page 50: Autozero (Autoz)
 PRINCIPLE AutoZero Purpose and Principle The main component of the change over time of PPC4 Q-RPTs is change in zero or offset, independent of span. Offsetting or “rezeroing” PPC4 Q-RPTs relative to a reference between recalibrations allows measurement uncertainty specifications to be maintained with less frequent full calibrations.
Page 51 AutoZeroed. For higher range Q-RPTs, this is easily accomplished with a variety of digital barometers or with a lower range Q-RPT in the PPC4 system. For lower range Q-RPTs, a piston gauge or other standard may be required to provide P with low enough uncertainty.
Page 52: Table 7. Autoz On And Off
AutoZ in absolute measurement mode on Q-RPTs of A350K or lower, is a gas operated piston gauge (such as a DHI PG7601) applying a pressure near 100 kPa to the PPC4 test port. The best day to day reference is a properly calibrated DHI RPM4 with a BA100K or A100K Q-RPT.
Page 53: 3.2.22.1 Edit Autoz
In gauge and negative gauge measurement modes, AutoZ is run automatically whenever the PPC4 is in the VENT condition. • Allow the PPC4 to stabilize at atmospheric pressure and ambient temperature for 10 to 15 minutes before running AutoZ. •...
Page 54: Drivers
LAN ports are installed only if the appropriate communication option is purchased.)  PRINCIPLE The PPC4 has two RS232 communications ports referred to as COM1 and COM2 as well as a front panel USB port. Optionally, the PPC4 may be configured with either an IEEE-488 (GPIB) port or Ethernet port.
Page 55: Reset
This clears out any settings that the user has made, and should be used only to restore the PPC4 to a known state. PPC4 goes through its power up sequence after any type of reset is executed.
Page 56: 3.2.25.2 Units
Resets Unit selections to factory defaults. For the Basic Interface, resets to the SI or US default selections depending on whether the PPC4 has been factory set for SI or US (see Section 3.2.10). For the Advanced Interface, clears the Favorites list.
Page 57: 3.2.25.5 All
Combines all resets in one global reset command that clears the entire user section of non-volatile memory returning PPC4 to the “as delivered” condition except the ID function (see Section 3.2.27.1) and the security level password (see Section 3.2.26.4).
Page 58: Preferences
To adjust the PPC4’s Screen Saver settings.  PRINCIPLE PPC4 has a Screen Saver function which causes the display to go into a screen saving mode after receiving no front panel input for a certain amount of time. The screen saving mode and default time depends on the PPC4 local interface configuration: Basic or Advanced.
Page 59: 3.2.26.3 Time
For these reasons, depending upon the application in which PPC4 is being used, it may be desirable to restrict access to certain functions for certain users. The user level function provides a means of restricting access to certain functions.
Page 60  Caution PPC4 is delivered with the security level set at low to avoid inadvertent altering of critical internal settings but with access to changing security levels unrestricted. It is recommended that the low security level be maintained at all times during normal operation.
Page 61: Table 11. Security Levels, Advanced Interface
• <Spec>, <Remote> • • <Spec>, <Cal> • <Spec>, <Internal>, <Config> • <Spec>, <Reset> • <Spec>, <AutoZ> “ • ” indicat es t he f unct ion/ menu is NOT accessible. Page 49 © 2009 DH Instruments, a Fluke Company...
Page 62: Internal Functions
To view, set, adjust, and maintain various aspects of PPC4’s internal operation. 3.2.27.1 Identification  PURPOSE To view or edit the PPC4 user ID and to view the PPC4 serial number. Note The ID can be set remotely from a computer which is more convenient than entering characters from the keyboard (see Section 6.5.4, ID command).
Page 63: 3.2.27.3 Barometer
For Basic Interface, see Section 4.5.7.2. For Advanced Interface, see Section 5.7.12.2. 3.2.27.3 Barometer  PURPOSE To view the value of atmospheric pressure as measured by the PPC4 on-board barometer. Note There is no on-board barometer in PPC4’s that have Gxxx (gauge) internal Q-RPTs only.
Page 64: 3.2.27.4 Purge
For Advanced Interface, see Section 5.7.12.4. 3.2.27.6 TEST (-) Vent  PURPOSE To cause a PPC4 or external RPM4’s Gxxx or BGxxx Q-RPT TEST (-) vent valve to stay open or closed rather than open and close automatically. Note This feature is active only when the active Q-RPT is a Gxxx (gauge) or BGxxx (bi-directional gauge) Q-RPT.
Page 65: Calibration
The uncertainty value is available locally with the Advanced Interface and is also available remotely in the response to the PRR command for all PPC4 models (see Section 6.5.4, PRR Command). Uncertainty can be defined with or without control components (delivered or measured pressure uncertainty).
Page 66: 3.2.29.1 Product Uncertainty
PPC4™ OPERATION AND MAINTENANCE MANUAL  PRINCIPLE The following uncertainty components can be configured for pressure uncertainty calculation, displayed when the PPC4 is Ready. 3.2.29.1 Product Uncertainty Product uncertainty is a combination of reference, repeatability, linearity, hysteresis and slope stability uncertainties. There are three quantities that define this component.
Page 67: 3.2.29.2 Head
Static Control The control uncertainty during static control is defined by the stability setting and the read rate of the PPC4. Typically, the control uncertainty in static mode is negligible unless the stability limit is set abnormally high. Page 55...
Page 68: 3.2.29.5 Combining Uncertainties
The value of control uncertainty may be considered pertinent, however, since the measured pressure can vary within the hold limit while Ready. Table 13. Default Values for PPC4 Uncertainty Components Q-RPT CLASS UNCERTAINTY FULL SCALE STANDARD...
Page 69: 3.2.29.6 Delivered Pressure Uncertainty
If in dynamic control mode the additional uncertainty that is combined is equal to the hold limit. When in static control mode the uncertainty is the current pressure stability in pressure units per second multiplied by the update rate of the PPC4.  ...
Page 71: Main Run Screen
Basic User Interface Main Run Screen The PPC4 Main Run Screen is its home display that is reached on power-up and from which other functions and menus are accessed. It is the very top level of all menu structures. The Main Run Screen is where the operator works with PPC4 to set and read pressures.
Page 72: Figure 9. Main Run Screen Display Fields
PPC4 function. pressure unit/second Leading character <T>: Pressure control identifies the value. target <D>: Deviation from the pressure control target Figure 9. Main Run Screen Display Fields © 2009 DH Instruments, a Fluke Company Page 60...
Page 73: Keypad And Controls
Figure 10. Basic PPC4 Keypad Layout 4.2.1 Set Pressure Automatically  PURPOSE To use the automated pressure control functions of PPC4 to set and maintain target pressure values.  OPERATION To set a pressure,  from the Main Run Screen. The display is: Standard Main Run Screen first line showing measured pressure and active Q-RPT.
Page 74: Interrupting Automated Pressure Control
Does not vent pressure. PPC4 passively measures the pressure. • : Suspends control and goes to ENTER target pressure value screen. Does not vent pressure. PPC4 passively measures the pressure applied to its TEST(+) port. To resume automated pressure control,  and ENTER a target pressure value.
Page 75: Vent
 activates a sequence to bring the test pressure to atmosphere (see Section 3.2.14).  OPERATION  causes PPC4 to control pressure to near atmospheric pressure and then open the system vent valve (see Figure 31 andFigure 32). On-going execution of the vent function is indicated by lighting a RED LED to the left of the ...
Page 76: Menu Tree Operation
Menu Tree Operation  PURPOSE Note  from the Main Run Screen to access all menu selections in the Basic Interface. <Setup> accesses a menu of functions and features commonly used in setting up and using PPC4. 4.4.1 <Setup>, <Range> ...
Page 77: Deleting Autorange Ranges
Edit the value of the jog step as desired.  to return to the Main Run Screen with the new jog step size active.  to return to the Main Run Screen with no change to the jog step size. Page 65 © 2009 DH Instruments, a Fluke Company...
Page 78: Setup>,
150 kPa in negative gauge mode of the same range. 4.4.4.1 Over Pressure Function In addition to the UL function, PPC4 has an over pressure function (see Section 3.2.21.1). To recover from an overpressure condition, correct the overpressure condition and cycle PPC4 power.
Page 79: Setup>,
Active control mode (<D> for dynamic, <S> for static). Edit the stability limit value if desired and  to return to the Main Run Screen with the edited values active. Page 67 © 2009 DH Instruments, a Fluke Company...

Page 80: Turning-Off Custom Control Parameters
 from the Main Run Screen to access all menu selections in the Basic Interface.  PURPOSE <Spec> accesses a menu of PPC4 functions and features that are less commonly used or not normally used in regular operation.  OPERATION ♦AutoZ ♦Remote ♦Head...
Page 81: Spec>,
4.5.1 <Spec>, <AutoZ>  PURPOSE To offset the PPC4 system Q-RPTs relative to a reference value in order to compensate for possible changes in Q-RPT zero between full recalibrations (see Section 3.2.22).  OPERATION To access the PPC4 AutoZ function menu use <Spec>, <AutoZ>. The display is: Active Q-RPT designator.

Page 82: Edit Autoz
(see Section 4.5.1.2). <Run> is only applicable to Axxx (absolute) Q-RPTs in absolute measurement mode. AutoZ is run automatically without operator intervention in gauge and negative gauge measurement modes whenever PPC4 is in the VENT condition (see Section 3.2.14). 4.5.1.1...
Page 83: Spec>,
The receiving terminating character must be a line feed and EOI. Carriage returns are ignored if received. The PPC4 sends a line feed and asserts the EOI line to terminate a reply. These settings are fixed to agree with IEEE Std. 488.2. If you change the address, the IEEE interface will reset (PON) and become idle.

Page 84: Rs232Test
PPC4™ OPERATION AND MAINTENANCE MANUAL 4.5.2.4 <RS232test> The RS232 self-test is provided to check the PPC4 COM ports and the interface cable independently of an external device or computer. If you are having difficulty communicating with PPC4 from a host computer using RS232, the RS232 self test can help establish that the PPC4 COM1 port you are trying to communicate with and the interface cable you are using are good.
Page 85: Spec>,
From the Main Menu screen, press <Spec>, <Head>. Select the desired height unit of measure and . Select the type of gas that is being supplied to PPC4 and . The characteristics of the gas selected will be used by PPC4 in calculating head pressures.

Page 86: Units
<Time> View and edit the internal time and date settings (see Section 4.5.5.3). <ID> View the PPC4 serial number (SN) and view or edit the ID number (see Section 4.5.5.4). <Level> View and set user security level and password (see Section 4.5.5.5).
Page 87: Scrsvr
<Date> to edit the date. The date must be specified in YYYYMMDD format. 4.5.5.4 <ID>  PURPOSE To view or edit the PPC4 user ID and to view the PPC4 serial number (see Section 3.2.27.1). Page 75 © 2009 DH Instruments, a Fluke Company...
Page 88: Level> (Security)
Table 12, Section 3.2.26.4.  OPERATION PPC4 is delivered with no active password and access to the User Level menu is open. The user level is set to low. User levels can be changed freely until a password has been created.
Page 89: Spec>,
The first field, <nn>, is the serial number of the PPC4, followed by a second field, <XXXXX> a number that the PPC4 changes each time the secondary password is used. The third field, <pppppp> is for user entry of the normal password.

Page 90: Spec>,
<Set up unit #n> screen. 4.5.7 <Spec>, <Internal>  PURPOSE To view, set, adjust, and maintain various aspects of PPC4’s internal operation (see Section 3.2.27).  OPERATION ♦Config ♦Control Ref To access the internal selections use <Spec>, ♦Baro ♦Purge ♦Lo Vnt...

Page 91: Baro
This is the normal Control Ref setting. <Vac> To set the PPC4 to assume that a vacuum supply is connected to the EXHAUST port. <Atm> To set the PPC4 to assume that the EXHAUST port is open to atmospheric pressure.
Page 92: Lo Vnt
PPC4™ OPERATION AND MAINTENANCE MANUAL 4.5.7.5 <Lo Vnt>  PURPOSE To cause a PPC4 or external RPM4’s Gxxx or BGxxx Q-RPT TEST (-) vent valve to stay open or closed rather than open and close automatically (see Section 3.2.27.5). Note This feature is active only when the active Q-RPT is a Gxxx (gauge) or BGxxx (bi-directional gauge) Q-RPT.
Page 93: Spec>,
Select AutoRange measurement mode: The screen is identical in appearance and function to the <Mode> screen (see Section 4.5.15). The choice of measurement modes offered reflects all the Q-RPT types available (Axxx, Gxxx, BGxxx) in the PPC4 system, not just the active Q-RPT.

Page 94: Leak
 Caution Before operating PPC4 with external Q-RPTs, check carefully that the Q- RPT TEST(+) port is connected to the PPC4 TEST(+) port. If the external Q- RPT is NOT connected to the PPC4 TEST(+) port, it will not measure the...
Page 95: Rpt
To view the results of the most recently completed leak check, press <View>. If NO leak check data is stored (i.e., if the PPC4 has never run a leak test or a reset has cleared previous leak test results), the results screen displays <Data not available> briefly and returns to Main Run Screen.
Page 96: Unit
Q-RPT and range. To select a range to become the active range,  while the desired range is displayed. PPC4 must be vented for the range change to occur.  if necessary to complete the range change.
Page 97: Mode
 PURPOSE To edit the pressure fluid head correction added or subtracted to the pressure measured by the PPC4 reference pressure transducer in order to predict the pressure at a height other than the PPC4 reference level (see Section 3.2.16).
Page 98: Purge
SPLT exhaust valve and displays <PURGING>. Once the pressure reaches less than 20 kPa (3 psi) gauge or 110 kPa (16 psi) absolute, PPC4 opens its internal vent valve and returns to the Main Run Screen in its normal vented condition.
Page 99: Ad V A N C E D U S E R I N T E R F A C
Main Run Screen The PPC4-ui Main Run Screen is the home display for the advanced user interface. It is displayed on power-up and is the screen from which all other functions and menus are accessed. It is the top level of the menu structure.
Page 100: Table 15. Main Run Screen Fields And Buttons
Shortcut to purge screen 5.7.3.1  AutoTest Shortcut to Advanced AutoTest 5.7.2  none [Settings] button Enter the PPC4 Settings menu * Noted fields have pressure values expressed in current pressure units. © 2009 DH Instruments, a Fluke Company Page 88...
Page 101: Other Screens
Some editable fields display current values on the selection screen for  convenience so the user can see them without having to select the field and change screens to do so.  Returns to Main Run Screen [Esc] button Page 89 © 2009 DH Instruments, a Fluke Company...
Page 102: Keypad Layout And Protocol
PPC4™ OPERATION AND MAINTENANCE MANUAL Keypad Layout and Protocol The PPC4 has a keypad and navigation knob for local operator access to on screen menus and for data entry in addition to direct pressure control keys.  Numeric keypad (black characters on white keys) ...
Page 103: Navigating Advanced Interface Menus
 from the Main Run Screen allows momentary viewing of the PPC4 model information screen. Examples of typical screens and descriptions of how to navigate in them are shown in the following examples.
Page 104 Note When the [OK] button is present it is necessary to press [OK] to accept any changes or they will be discarded. © 2009 DH Instruments, a Fluke Company Page 92...
Page 105: Pressure Control
5.5.1 Set Pressure Automatically  PURPOSE To use the automated pressure control functions of PPC4 to set and maintain target pressure values (see Section 3.2.12).  OPERATION To set a pressure,  from the Main Run Screen or click on the...
Page 106: Interrupting Automated Pressure Control
The down valves stay open until another pressure command is given or control is aborted. How low the pressure in the PPC4 and the system connected to the PPC4 TEST(+) will go is a function of the quality of the vacuum pump used, the characteristics of the volume and tubing connected to the TEST(+) port and PPC4’s internal restrictions.
Page 107: Vent
 activates a sequence to bring the test pressure to atmosphere (see Section 3.2.14).  OPERATION  causes PPC4 to control pressure to near atmospheric pressure and then open the system vent valve (see Figure 31 andFigure 32). On-going execution of the vent function is indicated by lighting a RED LED to the left of the ...
Page 108: Menu Operation
[Settings], <Internal> Menu operation 5.7.1 AutoRange  PURPOSE To automatically set up PPC4 to optimize its measurement and control characteristics and features to cover a specific pressure range (see Section 3.2.8). © 2009 DH Instruments, a Fluke Company Page 96...
Page 109 The choice of measurement modes offered reflects all the Q-RPT types available (Axxx, Gxxx, BGxxx) in the PPC4 system, not just the active Q-RPT. Full Scale: Edit the full scale pressure value in the unit of measure specified in the Unit field.
Page 110: Figure 14. Autorange Bar
Q-RPT spans and indicators from the AutoRanger bar on the main run screen (see Figure 14). The AutoRange Bar in the middle of the PPC4 Main Run Screen displays the range and a graphical indicator of the measured pressure within the range for both the active AutoRanged Range and the active Q-RPT (see Figure 14, showing a 200 kPa AutoRanged Span on a 700 kPa Q-RPT).
Page 111: Autotest
AutoTest  PURPOSE To execute a programmed sequence of automated pressure control target values and/or to AutoRange the PPC4 based on the full scale and tolerance of the device under test (see Section 3.2.15). [Tools], <AutoTest> accesses the main AutoTest menu.
Page 112: Quick Test
 aborts the sequence and and returns to the Exercise entry screen. [Esc] returns to the Main Run Screen. When the exercise sequence is complete the PPC4 sounds three two second beeps and returns to the main menu. 5.7.2.2 Quick Test ...
Page 113 (see Section 3.2.3)  and  can be used to adjust the pressure set by the PPC4 until the UUT reaches the cardinal value of the pressure increment using the Jog function (see Section 3.2.20). In User...
Page 114: Advanced Test
The measurement mode associated with the AutoRange. The choice of measurement modes offered reflects all the Q-RPT types available (Axxx, Gxxx, BGxxx) in the PPC4 system, not just the active Q-RPT. Full Scale: Enter the full scale pressure value in the unit of measure...
Page 115 5. ADVANCED USER INTERFACE Use UUT Tolerance: If this field is “Yes” the UUT Tolerance is used to determine the PPC4 resolution and hold limit settings for the resulting AutoRange. If this field is “No” the resolution and hold limit settings for the resulting AutoRange are determined based on the AutoRange full scale and the active selected Q-RPT.
Page 116 The time, in seconds, the pressure will hold at each step if the Timer mode is selected. Timer can be between 1 and 9999 seconds. Control Mode: Choose Static or Dynamic control mode (see Section 3.2.2). © 2009 DH Instruments, a Fluke Company Page 104...
Page 117 3.2.2.1), once a Ready condition has been achieved (see Section 3.2.3)  and  can be used to adjust the pressure set by the PPC4 until the UUT reaches the cardinal value of the pressure increment using the Jog function (see Section 3.2.20).
Page 118: Pressure
To execute the PPC4 test system Purge function using the optional Self Purging Liquid Trap (SPLT). Purge is used to collect and exhaust liquid contaminants from the device or system under test before they reach the PPC4 (see Section 3.2.17). © 2009 DH Instruments, a Fluke Company...
Page 119: Leak Test
Main Run Screen. PPC4 controls pressure down to less than 700 kPa (100 psi), stops control and displays <Preparing to purge> for five seconds. After the five second delay, PPC4 opens the SPLT exhaust valve and displays <Purging…>.
Page 120: Drivers
Leak Test in rate (Units/s) , pressure change in the Units and the Q-RPT active at the time of the test. If NO leak check data is stored (i.e., if the PPC4 has never run a leak test or a reset has cleared previous leak test results), <Pressure>...
Page 121: Control Configuration
This is the pressure reading of the reference device used for comparison. Note that the reference pressure must be entered in the same unit of measure as the PPC4 pressure. The current PPC4 pressure is shown for reference on the second line.
Page 122: Reset
 OPERATION From the Main Run Screen use [Tools], <System>, Reset, Settings. [Yes] to activate changes (perform the reset). The PPC4 will cycle power to complete and return to the Main Run Screen. [No] to make no changes and return to the Reset screen.
Page 123: Pressure
 OPERATION From the Main Run Screen use [Tools], <System>, Reset, Calibration [Yes] to activate changes (perform the reset). The PPC4 will cycle power to complete and return to the Main Run Screen. [No] to make no changes and return to the Reset screen.
Page 124 The Favorites tab in the Pressure Unit menu lists up to ten of the most recently used units for quick and easy selection. Select and Enter the unit selection. After the unit has been chosen the PPC4 returns to the Main Run Screen with the new unit active.
Page 125: Measurement Mode
Axxx Q-RPT, only gauge mode can be activated. 5.7.6.3 Head  PURPOSE To cause a pressure fluid head correction to be added or subtracted to the pressure measured by the PPC4 reference pressure transducer in order to Page 113 © 2009 DH Instruments, a Fluke Company...
Page 126: Resolution
PPC4™ OPERATION AND MAINTENANCE MANUAL predict the pressure at a height other than the PPC4’s reference level (see Section 3.2.16). Note Use of the Head function to ensure in tolerance measurements is most important in low absolute pressure ranges. Specifying the head height within ±...
Page 127: Preferences
Screen Saver screen. Edit Time, from 10 minutes to 8 hours. If Time is set to Off then the screen saver function will be disabled and the screen will remain on as long as the PPC4 power is on. Editing Style chooses the display when the screen saver is activated.
Page 128: Time
5.7.7.3 Time  PURPOSE To view and edit the PPC4 internal time and date settings (see Section 3.2.26.3).  OPERATION Note The PPC4 date and time are set to United States Mountain Standard Time in the final test and inspection process at the factory.
Page 129: Security
Note At the bottom left of the Password entry screen is a code (SN: sss-nnnn). The first part (sss) is the PPC4 serial number. The second part (nnnn) is a numer that is changed each time the secondary password is used (see 3.2.26.5).
Page 130: Control
RPM4 SDS pressure rating is less than the PPC4 maximum pressure then a warning will be displayed on the PPC4 front panel when the RPM4 is detected. addition, AutoRanged ranges greater than the SDS rating are not allowed (see Sections 3.2.5, 6.5.4, 3.2.8). In order...
Page 131: Pressure Control
(m) and psi if the altitude unit is feet (ft). 5.7.8.1.1 Over Pressure Function In addition to the UL function, PPC4 has an over pressure function (see Section 3.2.21.1). To recover from an overpressure condition, correct the overpressure condition and cycle PPC4 power. Be sure to correct the condition that caused the overpressure before cycling power.
Page 132: Jog Step
5.7.9 Remote  PURPOSE To configure the PPC4 COM1, COM2, IEEE-488 (GPIB), or LAN communication ports. To test COM1 and COM2 communications. To select remote programming communications format (see Section 3.2.24).  OPERATION [Settings], <More >>>, <Remote>...
Page 133: Com1 And Com2
The default is <2400, E, 7,1> for both COM1 and COM2. Note The PPC4 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). There are no options.
Page 134: Calibration
Calibration  PURPOSE To calibrate the PPC4 utility sensor, Hi and/or Lo Q-RPTs and adjust the on-board barometer. This function is considered part of PPC4 maintenance and is therefore covered in the maintenance section of this manual (see Sections 7.2, 7.3, 7.4).
Page 135: 5.7.12.2 Control Reference
5. ADVANCED USER INTERFACE 5.7.12.2 Control Reference  PURPOSE To specify whether the PPC4 should automatically determine whether a vacuum source or atmospheric pressure is connected to the EXHAUST port and to manually set the EXHAUST port condition (see Section 3.2.27.2).
Page 136: 5.7.12.5 Test (-) Vent
PPC4™ OPERATION AND MAINTENANCE MANUAL 5.7.12.5 TEST (-) Vent  PURPOSE To cause a PPC4 or external RPM4’s Gxxx or BGxxx Q-RPT TEST (-) Vent valve to stay open or closed rather than open and close automatically (see Section 3.2.27.6). Note This menu selection is available only when the active Q-RPT is a Gxxx (gauge) or BGxxx (bi-directional gauge) Q-RPT.
Page 137: Overview
Remote Operation Overview Most of the PPC4 front panel functions can also be executed by commands from a remote computer. The host computer can communicate to the PPC4 using the PPC4 RS232 (COM1),, IEEE-488 or Ethernet ports. Remote communications via USB are through the PPC4 API only. See PPC4 API documentation.
Page 138: Figure 15. Windows Hardware Wizard
Figure 15. Windows Hardware Wizard The driver is located in the \Driver sub directory of the PPC4 Cockpit application. By Default this directory is C:\Program Files\DH Instruments\PPC4 Cockpit\Driver. Alternatively the driver can be updated from the General Accessories CD distributed with the PPC4.
Page 139: Figure 17. Browse For Driver Location
6. REMOTE OPERATION Figure 17. Browse for Driver Location A driver warning message will display. The PPC4 USB driver has not been digitally signed for Windows Compatibility. [Continue Anyway] to proceed. Figure 18. Driver Warning Message Page 127 © 2009 DH Instruments, a Fluke Company...
Page 140: Running The Cockpit
6.2.3 Running the Cockpit The PPC4 Cockpit must be launched like any other application. It does not auto launch when the USB or RS232 ports are connected to the host PC. Use the desktop short-cut or the Windows Start menu to launch the PPC4 Cockpit. The opening program dialog provides the choice of interface to use for communication between the PPC4 and the PPC4 Cockpit.
Page 141: Usb Interface
If USB is selected, a secondary dialog displays to facilitate the selection of the specific PPC4. Only PPC4s actively connected to the host PC via USB are listed. Choose the specific PPC4. [OK] to continue. The Cockpit will load the PPC4 information and run.
Page 142: Keyboard Shortcuts
Several keyboard shortcuts are provided to emulate the pressure control buttons on the PPC4 front panel. See Table 18 for a list of all pressure control keyboard shortcuts. There is also a pressure control panel accessed by pressing the arrow on the bottom right of the PPC4 Cockpit display.
Page 143: Remote Interfacing
Sending a program message to the PPC4 places it into Remote mode. The remote indicator below the the display window lights when the PPC4 is in Remote mode. It will also flicker when a program message is received. The menus usually accessed from the front panel are locked out while in remote.
Page 144: Rs232 Command Testing
(see Section 5.7.9.1 for the Advanced Interface and Section 4.5.2.1 for the Basic Interface). Refer to the following series of steps to configure Hyperterminal assuming that the PPC4 is connected to COM4 of a host PC using a baud rate of 2400, 7 data bits, event parity and 1 stop bit.
Page 145 COM1 and COM2 ports on the back of the PPC4. After the COM port selection, the RS232 settings of the PPC4 must be defined. The specific PPC4 settings are accessed through the PPC4 front panel.
Page 146: Figure 27. Hyperterminal Ascii Setup
These selections enable a carriage return (ASCII 13) and line feed (ASCII10) to be appended to the end of the commands to the PPC4 and the corresponding responses. Press [OK] after the edits are complete. Figure 27. Hyperterminal ASCII Setup At this point it is best to save and close the current Hyperterminal session.
Page 147: Ieee-488
6.3.2 IEEE-488 The PPC4 IEEE-488 interface is located on the back of the unit. The physical and electrical interface conforms to IEEE Std 488.1-1987 Subset E2 and IEEE Std. 488.2-1992. Do not attempt to communicate with the IEEE-488 interface while using the COM1, Ethernet or USB interfaces.
Page 148: Usb
6.3.3 The PPC4 can be connected to a PC via USB (Universal Serial Bus) through the port on the front of the instrument. If the PPC4 is equipped with the optional Ethernet module (see 6.3.4), the connection can be established via the secondary USB port on the back of the unit.
Page 149: Programming Formats
The main difference between the two formats is that when using the IEEE-488 interface, a “?” must be included in an enhanced command for there to be a response from the PPC4. In all other cases (classic or enhanced), every command has a response. In addition, the enhanced message format supports IEEE Std. 488.2 syntax, format and status reporting.
Page 150: Using Command Type Commands
PPC4 in the form of comma delimited arguments. This data is usually a setting of some sort that is stored in the PPC4. If data is specified, it must be preceded by at least one white space from the program message header and be within the range and format described in the program message description.
Page 151: Using Query Type Commands
Software must wait for a reply with a query. If any type of program message is sent to the PPC4 after a query before receiving a reply, the program message will be discarded and an error will be generated. Errors are reporting using the IEEE Std.
Page 152 QPRR Quickly read the last known pressure, rate, on-board barometer reading, control status and QRPT uncertainty. RANGE Read or set and Q-RPT or utility sensor default range (PPC4 command). RATE Read the next available rate of change of pressure. READYCK Read or set a flag that is cleared by a Not Ready condition.
Page 153: Error Messages
ERR# 38 “Selected range is not available” ERR# 39 “Data verify error” ERR# 45 “Argument not allowed” ERR #46 “Argument cannot be negative” ERR #52 “Command obsolete” ERR# 53 “Not Available” Page 141 © 2009 DH Instruments, a Fluke Company...
Page 154: Program Message Description Overview
A brief description of the programs message’s function. Command This is the Enhanced program message syntax to send data to the PPC4 or to execute a PPC4 function. The PPC4 must be set to use the enhanced format (see Section 3.5.2.3) to use the syntax and style shown.
Page 155: Program Message Descriptions
The PPC4 COM2 port can be used to communicate to another RS232 device (such as another PPC4). This allows the user to use one COM port or IEEE-488 port on the host computer to communicate with the PPC4 and another device. A carriage return and a line feed (<CR><LF>) are added to the string.
Page 156 External RPM4, Lo Q-RPT Remarks The ARANGE command is used to define a PPC4 range by specifying a desired unit of measure, measurement mode and maximum pressure, and have the PPC4 pick the best available Q-RPT and make operational adjustments to optimize that range. Available Q-RPTs may be determined by the use of the “RPT”...
Page 157 ’1’ To enable AUTO mode. This will override the manual selection. Remarks At low pressures, PPC4 control is affected by whether the EXHAUST port is open to atmosphere or connected to vacuum. The PPC4 has an internal sensor that can be used to automatically determine if the EXHAUST port is open to atmosphere or to a vacuum.
Page 158 ’1’ Autozero ON Remarks The PPC4 AutoZ function can be turned ON and OFF. There is a separate AutoZ flag for the gauge and absolute modes for each RPT. This command sets the AutoZ status for the current mode of the active internal or external RPT only.
Page 159 The COM1 port is used to communicate to the PPC4. When the COM1 port configuration of the PPC4 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 160 Arguments date: The date in the numerical only format YYYYMMDD. Remarks The PPC4 has an internal real time calendar clock. It is used for date stamping calibrations. The reply is always in the YYYYMMDD format. Example Cmd sent: “DATE 20030115”...
Page 161 The slow speed will be used for a calculated amount of time (up to 5 seconds) to create the desired change. The PPC4 will not attempt to control the pressure to a target, so the change in pressure will be approximate. This is the equivalent of using .
Page 162 The fluid type. This must be “N2”, “Air”, “He” or “User”. Remarks The PPC4 can make a fluid head correction to allow it to display the pressure at the level of the device under test instead of at the level of the PPC4.
Page 163 An alphanumeric string up to 12 characters long. Remarks The user defined ID label can be used to allow the user to “tag” the PPC4 with a unique identifier. This ID is stored in non-volatile memory and cannot be erased by a power failure, system fault or...
Page 164 The slow speed will be used for a calculated amount of time (up to 5 seconds) to create the desired change. The PPC4 will not attempt to control the pressure to a target, so the change in pressure will be approximate. This is the equivalent of using .
Page 165 Value is always a negative value of gauge pressure. Remarks Negative gauge mode in PPC4 has a lower limit. New automated pressure control targets can not be less than this value. If the pressure exceeds the lower limit, the pressure display flashes, and pressure control is aborted.
Page 166 ’1’ for dynamic pressure control. Remarks The method which the PPC4 controls pressure is selected with the “MODE” program message. When the control mode is set, control parameters go to default parameters for that range. The control mode setting is range dependent.
Page 167 Remarks The user can select the type of remote command format to use. This format must agree with the format sent to the PPC4. The enhanced query form of this command (“MSGFMT? n”) should always be used to set the desired format, as it will be accepted regardless of the current format (classic or enhanced).
Page 168 ‘AUTO’ for the PPC4 to automatically open and close the low vent valve. Remarks A PPC4 with at least one Gxxx or BGxxx Q-RPT has a valve that is used to vent the TEST (-) port. This valve is normally controlled automatically depending on current PPC4 operation but it can be commanded to open or close using the “NVENT”...
Page 169 RPT is an Axxx Q-RPT, then the RPT will only be allowed to operate in gauge mode. Changes made using this program message take effect immediately. The calibration information of DHI RPM4s connected to PPC4 must be adjusted directly on the RPM4. The information cannot be adjusted through the PPC4.
Page 170 (R or NR). The ready status is described in the “SR” program message. The pressure value and pressure unit of measure are right justified in this field. After receiving this program message, the PPC4 replies back with the data after a new pressure measurement cycle is complete. This can take up to 1.5 seconds.
Page 171 (and always absolute). This is followed by the current pressure unit. Not all PPC4s are equipped with an on-board barometer. This field is “NONE” if the PPC4 is not equipped with an on-board barometer. status: Generation status. Similar to the reply of the STAT command. Can be a sum of the following states:: The system is not generating or holding a pressure or vented.
Page 172 The PPC4 sets the specified target pressure using the current control settings and mode. Control continues until a new target pressure is set, the PPC4 goes into LOCAL mode, or an “ABORT” program message is executed. If the given target is ‘0’ and the pressure units are gauge, the PPC4 vents.
Page 173 The target pressure in the current pressure units. Remarks The PPC4 sets the given target pressure using just the slow speed, and stops controlling when the pressure has reached or passed the given target. The system does not attempt to maintain the target pressure.
Page 174 (and always absolute). This is followed by the current pressure unit. Not all PPC4s are equipped with an on-board barometer. This field is “NONE”if the PPC4 is not equipped with an on-board barometer. status: Generation status. Similar to the reply of the STAT command. Can be a sum of the following states: The system is not generating or holding a pressure or vented.
Page 175 “RPT” command or function key before the can be selected The reply indicates the active range in psi if the PPC4 is a “US” version or in kPa if the PPC4 is an “SI” version.
Page 176 “READYCK” Remarks The internal ready check flag is cleared whenever the PPC4 reaches a Not Ready (NR) condition. The “READYCK” query returns the status of the flag. The flag is set by sending the “READYCK 1” program message while the PPC4 is in a Ready condition. The “READYCK”...
Page 177 System calibration coefficients and communications settings are not affected. The remote “RESET” program message corresponds to the front panel “Reset Settings.” The reset cycle takes up to 5 seconds to complete and involves a power cycle of the PPC4. Remote communications should not take place during this period.
Page 178 ‘4’ The first external RPM4, Lo Q-RPT Remarks Up to four Q-RPTs can be available for use in one PPC4 system. Two of these can be internal, and the other two are external. These Q-RPTs must be identified and initalized before the can be used by the PPC4.
Page 179 Default “SCRSAV 10, 0” Remarks The PPC4 front panel will dim basic display or switch the GUI to a screen saver pattern after a period of keyboard and remote inactivity. Setting this value to ‘0’ disables this feature. Example Cmd sent: “SCRSAV 30, 1”...
Page 180 The stability limit can be read and set as a percent of the full scale range of the Q-RPT range. If this program message is used to set the stability limit, the PPC4 will then use CUSTOM control settings. Example Cmd sent: “SS% .1”...
Page 181 The time in a 24 hour format using a colon delimiter (24 hour mode) Remarks The PPC4 has an internal real time clock. It is used for date stamping calibrations and log data. The TIMEFMT command can be used to set the clock for 12hr or 24hr mode Example Cmd sent: “TIME 12:52PM”...
Page 182 “UCOEF?” Classic “UCOEF” Remarks The PPC4 handles all pressure values internally in Pascal. The coefficient replied is equivalent of 1 Pa in the current pressure unit of measure. This program message allows the user to convert pressures Example Query sent: “UCOEF?”...
Page 183 The upper limit pressure in the current pressure unit and measurement mode. Remarks The PPC4 has an upper limit for each range and for each measurement mode (gauge and absolute). New automated pressure control targets cannot be greater than this value. If the pressure does exceed the upper limit, the pressure display flashes, and pressure control stops.
Page 184 “mmH2O”, then the reference temperature is assumed to be 20 °C. Note The legacy units inWa, mWa and mmWa have been replaced by inH2O, mH2O and mmH2O in the PPC4 and in documentation. The unit command and others such as ARANGE continue to support the former “xxWA” units. The conversion factors are identical.
Page 185 6. REMOTE OPERATION Purpose Read or set the status of the PPC4 EXHAUST port vacuum or atmosphere monitoring system. Command “VAC n” Query “VAC?” Classic “VAC=n” “VAC” Default “VAC 0” Arguments ’0’ To disable auto mode and specify that the PPC4 EXHAUST port is open to atmosphere.
Page 186 “VER?” Classic “VER” Remarks The software version of the PPC4 can be read. This is useful for checking for the presence of the PPC4 and for reference purposes. It indicates the internal Q-RPT(s) and software version. Example Query sent: “VER?”...
Page 187: Status Reporting System
6.6.1 Error Queue The PPC4 keeps track of remote errors by using an error queue. If an error occurs, it is pushed onto the Error Queue. If you are using the COM1 port, the error number is immediately replied in the form “ERR#nn where nn is the error code from 0 to 99. The “ERR?” (or “ERR”) query can then be used to pull the error from the Error Queue in it’s descriptive text format.
Page 188: Figure 28. Status Register Schematic
Indicates that the SRQ line of the IEEE-488 interface has been asserted by the PPC4. This bit is cleared when a serial poll is performed on the PPC4, and is a part of the Status Byte Register when read using a serial poll. This bit does not apply if the COM1 port is being used.
Page 189: Standard Event Register
ESB bit. The description of these bits are given as: Power On (Bit 7) Indicates that the PPC4 power has been cycled since the last time this bit was read or cleared. User Request (Bit 6) Indicates that the PPC4 was set to local operation manually from the front panel by the user (pressing the [ESC] key).
Page 190: Ieee Std. 488.2 Common And Status Program Messages
IEEE STD. 488.2 Common And Status Program Messages The PPC4 supports a set of commands that are common to all instruments conforming to IEEE Std. 488.2. These command make it easy to perform basic function for any device that supports these commands.
Page 191 “∗OPC” Query “∗OPC?” Remarks This Command enables the PPC4 to set the OPC bit in the Standard Event Status Register when it has completed all pending functions. The Query replies with a “1” when all functions are complete. Example Sent: “∗OPC”...
Page 192 ∗TST query will return a non zero value. If the PPC4 passed the test on power-up OR if the ∗TST query was used at least once since the PPC4 was powered up the reply will be a ‘0’.
Page 193 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) Page 181 © 2009 DH Instruments, a Fluke Company...
Page 195: Overview
Section 8. Note PPC4 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 196: Pa And Pm Coefficients
General Accessories Disk with the new PPC4. Most users should use CalTool software to assist in the calibration of PPC4. PPC4 is delivered with an interactive Q-RPT calibration utility that steps the operator through the complete Q-RPT calibration procedure including applying the necessary pressures,...
Page 197: As Received And As Left Data
The necessary information to report as received and as left data on the calibration of PPC4 Q-RPTs can be obtained in several ways. When the PPC4 CalTool calibration assistance software is used, as received data is displayed while running the calibration and is automatically recorded and provided if desired.
Page 198: Set-Up And Preparation
Premium, Standard or Full Scale Standard Class (see Section 1.2.2.1). The class of the PPC4 Q-RPTs is indicated on the model number on the product label and on the rear panel Q-RPT model (<p> for premium, <s> for standard and <f> for full scale standard - for example A7Ms or A7Mp).
Page 199: Standard And Full Scale Standard Class Q-Rpts
Axxx (absolute) Q-RPTs calibrated in gauge measurement mode by applying gauge reference pressure values should be used in gauge mode only (see Section 7.2.5). Page 187 © 2009 DH Instruments, a Fluke Company...
Page 200: Premium Class Q-Rpts
AutoRanged span of 30 % of the maximum Q-RPT span. For example, verify an A7M Q-RPT in the default range of 0 to 7 MPa (1 000 psi) and in the AutoRange range of 2.1 MPa (300 psi). © 2009 DH Instruments, a Fluke Company Page 188...
Page 201: Table 30. Calibration Point Sequence, Premium Class, Axxx And Gxxx Q-Rpts
(positive pressures) measurement mode only. Use the gauge mode (Gxxx) calibration point sequence (see Table 30). BGxxx Q-RPTs calibrated in gauge measurement mode only should not be used in negative gauge mode. Page 189 © 2009 DH Instruments, a Fluke Company...
Page 202: Turning Off Absolute And Negative Gauge Measurement Modes For Axxx (Absolute) Q-Rpts
[OK] to accept change and exit to Main Run Screen, [Back] to retun to or  to exit to the Main Run <Calibration> without making changes, [Esc] Screen without making changes. © 2009 DH Instruments, a Fluke Company Page 190...
Page 203: Q-Rpt Calibration Using Caltool For Rpts Software
Note • A new PPC4 is delivered with PA and PM values set to zero and 1 for all ranges. This does not mean that the PPC4 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 204: Basic Interface
Enter Date year/month/day format (yyyymmdd) Enter PA in units of Pa Enter PM (dimensionless) Gauge Only: On to prevent Absolute or Negative Gauge modes with an Absolute Q-RPT (see Section 7.2.5). © 2009 DH Instruments, a Fluke Company Page 192...
Page 205: Q- Rpt Uncertainty
Main Run Screen. [Back] to return to or  to exit to the Main Run Screen <Calibration> and make no changes. [Esc] and make no changes. Page 193 © 2009 DH Instruments, a Fluke Company...
Page 206: Q-Rpt Calibration/Adjustment Without Caltool For Rpts Software
7.2.8 Q-RPT Calibration/Adjustment without CalTool for RPTs Software  PRINCIPLE The PPC4 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 PPC4.
Page 207: Advanced Interface Operation
Perform additional verification pressure runs as desired. 7.2.8.2 Advanced Interface Operation The typical procedure for calibrating a Q-RPT in a PPC4-ui (with Advanced User Interface) is: Set-up and prepare the PPC4 for calibration (see Sections 7.2.2 and 7.2.3). Activate the Q-RPT to be calibrated using...
Page 208: Adjustment Of An On-Board Barometer
 PURPOSE To adjust the output of the on-board barometer (see Sections 1.2.2.3 and 3.2.27.3). Note PPC4’s that have only Gxxx Q-RPTs (no Axxx, BGxxx or utility sensors) are NOT equipped with an on-board barometer.  PRINCIPLE The on-board barometer output can be adjusted using PA and PM values in the same manner as Q-RPTs (see Section 7.2.1.1).
Page 209: Adjustment Of Utility Sensor
(for example leaks, restrictions in test lines, unstable pressure supply, unstable vacuum supply). The configuration function may also be useful to speed up PPC4 pressure control when the minimum test volume is in excess of 500 cc.
Page 210: Basic Interface Operation
Main Run Screen with no change to the pressure control coefficients. If the PPC4 has a Hi Q-RPT less than or equal to A350K, repeat the configuration routine in the other operating mode (<Vac> or <Atm>). If you never use the PPC4 in one of the two conditions, it is not necessary to configure it in that condition.
Page 211: Advanced Interface Operation
A Flash loading utility and the latest PPC4 software are available for download at no charge. If you do not have access to the web or have difficulty downloading or loading software, contact your DHI representative or a DHI Authorized Service Provider for assistance.
Page 212: Removing The Ppc4 Cover
Then, using the two M3 x 20 mm screws in the PPC4 accessory kit, gradually back the cover from the closed and secured position using both screws.
Page 213: Subassembly Description And Location
(see Section 7.4). • Pressurize PPC4 to 90 % of maximum pressure and leak test. Select <Leak> in the Main Menu for Basic Interface. Use the Leak Test shortcut from the Main Run Screen in the Advanced Interface (see Section 3.2.18). Leak rate, after stabilization, should not exceed 0.001 % of maximum pressure/ second.
Page 214: Power Supply Module
7.9.3.1 Hi Q-RPT or Utility Sensor The higher range pressure transducer in a PPC4 may be a Q-RPT (quartz reference pressure transducer) or a utility sensor depending on the specified PPC4 configuration. A Q-RPT is intended to provide very high precision, low uncertainty, traceable pressure measurement.
Page 215: Vacuum Sensor
The vacuum sensor is a silicon solid state pressure sensor in the barometric range. The vacuum sensor readings are used to determine whether a atmospheric pressure or a vacuum pressure is applied to the PPC4 EXHAUST port (see Section 3.2.27.2). 7.9.6 Pressure Control Module The pressure control module is an integrated assembly that includes two inlet (fast and slow);...
Page 216: Pneumatic Schematics
PPC4™ OPERATION AND MAINTENANCE MANUAL 7.10 Pneumatic Schematics 7.10.1 Pressure Control Module Note Figure 31. Pressure Control Module Schematic © 2009 DH Instruments, a Fluke Company Page 204...
Page 217: Q-Rpt Module Configurations
Valve C is the TEST (-) vent valve. In normal operation with BGxxx or Gxxx Q-RPTs, this valve is closed during fine pressure control (see Section 3.5.7.5). Valve D is shown for reference. It is in the pressure control module. Page 205 © 2009 DH Instruments, a Fluke Company...
Page 218: Figure 32. Q-Rpt Module Schematics For Various Configurations
Valve C is the TEST (-) vent valve. In normal operation with BGxxx or Gxxx Q-RPTs, this valve is closed during fine pressure control (see Section 3.5.7.5). Figure 32. Q-RPT Module Schematics for Various Configurations © 2009 DH Instruments, a Fluke Company Page 206...
Page 219: Table 32. Troubleshooting Guide
Before assuming that unexpected behavior is caused by a system defect or breakdown, the operator should use this manual and other training facilities to become thoroughly familiar with PPC4 operation. This troubleshooting guide is intended as an aid in identifying the reason for PPC4 behavior and determining whether the behavior is due to normal operation or an internal or external problem.
Page 220 Connect vacuum source to EXHAUST port. Vacuum source on EXHAUST port is needed. 2.3.5 Poor pressure control at low Connect TEST (-) ports of PPC4, RPM4s if gauge pressure. Ambient (atmospheric pressure) is too noisy present and UUT together and consider and/or not consistent on TEST (-) port and UUT.
Page 221 PROBABLE CAUSE SOLUTION There is a restriction in the test connection between the PPC4 and the test or the PPC4, Remove the restriction to allow free flow the RPM4 and the test. Restrictions are between the PPC4, the RPM4 (if present) particularly problematic at low absolute and the test.
Page 222 Activate SPLT; correct SPLT connection or Will not vent while purging. Stuck at function is activated but no SPLT is repair SPLT exhaust valve. 3.2.27.4, pressure during purging. connected or SPLT valve is not operating. 2.3.7.1 © 2009 DH Instruments, a Fluke Company Page 210...
Page 223: Drivers
[mA] 1 000 The male connector (P/N 401382) for the DRIVERS port is delivered with the PPC4 accessories. Table 34 and Figure 33 should be referred to when building a cable to utilize the drivers port. Table 34. External Drivers Pin Outs...
Page 224: Unit Conversion
9.2.1 Pressure PPC4 performs all internal calculations in SI units. Numerical values input or output in other units are converted to SI immediately after entry and back to other units just before output as needed. Table 30 provides the conversion coefficients used by PPC4 to convert numerical values expressed in SI units to corresponding values expressed in other units.
Page 225: Overview
In no event shall DH Instruments, a Fluke Company be liable to purchaser for any unforeseeable or indirect damage, it being expressly stated that, for the purpose of this warranty, such indirect damage includes, but is not limited to,...
Page 227 Internal, Lo. Refers to a Q-RPT internal to the PPC4 that is the lower of the two if there is a second Q-RPT or utility sensor in the PPC4.
Page 228 In negative gauge measurement mode there is also a lower limit. Utility Sensor The internal, high (IuH) transducer in a PPC4 if when there is no Q-RPT in the IH position. A utility sensor is a low accuracy pressure transducer used for pressure indication, safety and housekeeping functions, not for low uncertainty measurement.

DH Instruments PPC4 Operation And Maintenance Manual

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About this Manual

1 Introduction

10 . W a R R a N T

1000 M a I N T E N a N C E , Ad J U S T M E N T S a N D C a L I B R a T I O

1 . G L O S S a R

2 Installation

3 O P E R a T I N G P R I N C I P L E

4 Basic User Interface

5 Ad V a N C E D U S E R I N T E R F a C

6 Remote Operation

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