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PPCK+™ High Pressure Controller/Calibrator

1. PPCK Operation and Maintenance Manual PSS Purpose Set a new target pressure and use just the slow speed to generate the pressure Command PSS n Classic PSS n Arguments n The target pressure in the current pressure units Remarks The PPCK will set the given target pressure using just the slow speed and will stop generating when the pressure has reached or passed the given target The system will not attempt to hold the pressure Control stops after the pressure is set The PR PRR STAT or SR program message can be used to monitor the progress of the generation Example Cmd sent PSS 1000 enhanced Reply 1000 000 kPaa no reply if IEEE 488 Example Sent PSS 1000 classic Reply 1000 000 kPaa Errors ERR 6 The target pressure is out of range See Also 3 1 2 2 PR PRR STAT SR PSF RATES QPRR Purpose Read the last RPT pressure rate and ATM pressure Query QPRR Classic QPRR Remarks The last measured Ready condition pressure rate of pressure change and ambient pressure for the active RPT always Hi RPT in PPCK and range is returned in the current pressure units This program message is useful when a rapid response of measured pressure is needed Each data field is separated by a comma and is returned in the following order Ready
2. HI for the high pressure RPT PPCK has only a high pressure RPT Remarks The range and active RPT must be selected before making changes to settings that are dependent on the range Each RPTs has 3 separate ranges You must specify both the range and the RPT The system MUST BE VENTED to switch RPTs The query reply is in the current units Example Cmd sent RANGE HI enhanced Query reply 30000 psia Example Sent RANGE 1 HI classic Reply 3000 psia Errors ERR 6 Invalid n or XX argument ERR 22 System must be vented for the requested operation ERR 38 The selected range is not available See Also 3 1 2 6 3 2 1 RANGEHI Purpose Read the three RPT ranges available Query RANGEHI Classic RANGE Remarks The PPCK supports three ranges The RANGEHI command fetches the PPCK model the range units and the ranges available for the PPCK in gauge and absolute mode These values are returned in the following order RptType model unit AbsRng1 AbsRng2 AbsRng3 GaRng1 GaRng2 GaRng3 Field Descriptions RptType Always 0 Model A3000 A6000 or A10000 unit The range units psi kPa or MPa AbsRng Range 1 3 in absolute mode in the replied unit GaRng Range 1 3 in gauge mode in the replied unit Example Cmd sent RANGEHI enhanced Query reply 0 A3000 psi 1000 2000 3000 1000 2000 3000 Example Sent RANGEHI
3. Example Query sent PRR classic Reply R 2306 265 kPaa 0 011 kPa s 97 000 kPaa See Also 3 1 2 4 3 1 2 5 3 4 4 7 ATM PR QPRR SR 2001 DH Instruments Inc Page 90 PPCK Operation and Maintenance Manual DHI e PS Purpose Set a new target pressure and start a new pressure generation cycle Allows the test volume to be specified Command PS n v Classic PS n v Arguments n The target pressure in the current pressure units v The device system under test volume in cc optional Remarks The PPCK will generate the given target pressure using the current generation settings and mode Generation will continue until a new target pressure is set the PPCK goes into LOCAL mode or an ABORT program message is executed If the given target is 0 and the pressure units are gauge the PPCK will vent The PR PRR STAT or SR program message queries can be used to monitor the progress of the generation If the optional v argument is used the PPCK will not attempt to self configure itself to the volume under test but instead will use the given volume for the pressure generation The v argument should only be used in automated conditions where the test volume is constant and the unit configuration does not change This argument is only a coarse value and ma
4. RST Purpose Resets the PPCK control settings to factory settings Command RST Remarks This Command sets the PPCK settings to factory settings This equivalent to a front panel executed RESET SET This does not affect the communications settings Example Sent RST enhanced Reply RST no reply if IEEE 488 See Also 3 4 4 5 RESET SRE Purpose Read or set the Service Request Enable Register Command SRE n Query SRE Default SRE 0 Arguments n 0 to 255 This is the decimal representation of the bit s to enable To allow the MAV and ESB bits to assert the SRQ line the argument would be 32 16 48 Bit 6 64 is reserved and cannot be set Remarks The Service Request Enable Register determines which bits of the Status Byte can set the MSS bit of the Status Byte and request service by asserting the SRQ line of the IEEE 488 interface Example Sent SRE 48 enables the MAV and ESB bits enhanced Query reply 48 no reply if IEEE 488 Errors ERR 6 nis not valid Page 113 2001 DH Instruments Inc PPCK Operation and Maintenance Manual STB Purpose Read the Status Byte Register Command STB Remarks The Status Byte Register reflects the general status of the PPCK The MSS bit state is represented by bit 6 Example Sent STB enhanced Reply 80
5. Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Table 19 Table 20 Table 21 Table 22 PPCK Operation and Maintenance Manual TABLES Model Designations and Ranges arescit eens ee eaae eee eee Aa Kaea Raa a eR 3 Default Pressure Control Parameters ccccccceeeeeceeeeeceeeeeeeaeeeeaeeseeeeseaeeeeaaeeseaeeesaeeeeeeeeeeeee 5 PPGK Packing Listede teienei nea araia oA Eea aa ena ee 7 Static and Dynamic Pressure Control Modes SUMMALY cceecceeeeeeeeeteeceeeeeseaeeetaeeeeeeeess 22 PPCK Range Identification Summary cccceceeeeeeeeeeeneeeceaeeeeeeeeceaeeecaaeeeeaeeseeeesaeeeseaeeenaees 27 Summary of PPCK Direct Function Key Operation 29 Default Pressure Control Parameters cccccccceeececeeceeceneeeeeaeeseneeceaeeesaaeeeeaeeeseaeeesaeeseaeeesaees 34 UNIT Function Available Units osier ccc ee ecneee ee eenne ee ee eeaeeeeeeaaeeeeeeaaeeeeesaaeeeeesaeeeeeeeaeeeenes 55 SECUMILY LOVElS EA E A AteadacpeeShbeecteet eebe g design ehren de 65 Pin Designations and Connections ssessssesssisssiessirssirssiesiisttiettisstnnttinstnnttnnstnnntnnnntnnnn nnne 70 List of PPCK COM2 DB 9M Pin Designations cccccccceeeeeeeeeeeeeeeaeeeeeeeseeeeeseaeeeeaeeeeneeees 70 Program Message EE 73 Error Sand Descriptions TE 75 8 Bit Status Byte H ier a Ea aa A raaraa
6. TP classic Reply 1000 00 kPaa See Also 3 2 3 3 2 10 PS Page 101 2001 DH Instruments Inc PPCK Operation and Maintenance Manual UCOEF Purpose To convert 1 Pascal to the current pressure units Query UCOEF Classic UCOEF Remarks The PPCK handles all pressure values internally in Pascal The coef replied is equivalent of 1 Pa This program message allows the user to convert pressures Example Query sent UCOEF enhanced Query reply 0 0010000000 kPa Example Sent UCOEF classic Reply 0 0010000000 kPa See Also 7 2 1 3 2 2 UDU Purpose Read or set the user defined pressure units Command UDU label ucoef Query UDU Classic UDU abel ucoef UDU label User unit Device label 4 alphanumeric char maximum It cannot be an already supported unit ucoef User conversion coefficient units Pa Default UDU USER 1 0 Remarks The user defined unit must be set up with the program message prior to remote or local selection Example Cmd sent UDU MYUN 001 enhanced Query reply MYUN 0 0010 Example Sent UDU MYUN 001 enhanced Reply MYUN 0 0010 See Also 3 2 2 3 4 3 2001 DH Instruments Inc Page 102 PPCK Operation and Maintenance Manual DHI e UL Purpose Read or set
7. 5 2 1 4 PA AND PM COEFFICIENTS EE 5 2 1 2 SETTING ZNATERR 5 2 1 3 ORDER OF OPERATIONG 5 2 1 4 AS RECEIVED AS LEFT DATA 5 2 2 EQUIPMENT REQUIRED e 5 2 3 SET UP AND PREPARATION u s s 12 1e11011eo1eo1no1retreorentnnnnnnnenrnnes 5 2 4 RPT CALIBRATION USING CALTOOL FOR RPTs SOFTWARE EE 5 2 5 EDITING AND VIEWING RPT CALIBRATION INFORMATION EE 120 526 SETTING 2NATERE eet 122 5 2 7 RPT CALIBRATION ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE 122 5 3 ADJUSTMENT OF ON BOARD BAROMETER sssssssssssssssssssessssssessesssessesssssuesaessutesessesseeseeseessesees 124 SAS WPDIRAIIN BUDGE a Eeer Ende 124 5 5 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY EE 125 5 6 SUBASSEMBLY DESCRIPTION AND LOCATION sssssssssssssesssssessessessessessssssesssseeneeseeaseneeseneensenses 126 5 6 1 LOW PRESSURE PNEUMATIC MODULE cccssssssssssssssscssssssssssssssssssssssssssussssseseessssssnuseceeseesssssssnnnscsseeeeesees 126 5 6 2 HIGH PRESSURE PNEUMATIC MODULE EE 126 564 DRIVEH BOARD EE 127 5 64 POWER SUPPLIES x i ena et un a e nee 128 5 6 5 ON BOARD BAROMETER EE 128 5 616 JMICRO CARD EE 128 5 6 7 THERMAL PRESSURE CONTROL UNIT TECH 128 5 6 8 REFERENCE PRESSURE TRANSDUCER RPT EE 128 TROUBLESHOOTING WE 129 DRENKEN EE EE ENEE E meen bees EE E Se 135 DM GOEN 135 7 2 UNIT CONVERSION gie 137 724 PRESSURE omshi i Seca AE O ENAA EAE AAA 137 73 GLOSSAR EE 138 7 44 WARRANTY STATEMENT EE 140 Page iii 2001 DH Instruments Inc
8. DH200 F 3 IEEE 488 Connector 11 TEST Port DH200 F A COM1 Connector 12 VENT Port 1 8 in NPT F 5 Fuse 13 DRIVE OUT Port 1 8 in NPT F 6 Power Switch 14 DRIVE IN Port 1 8 in NPT F 7 Power Plug IEC320 C13 15 SUPPLY Port DH200 F 8 Drivers Option Connector Figure 2 Rear Panel Assembly 23 3 POMER CONNECTION Check that the PPCK power switch is OFF Connect the supplied power cable to the rear panel power module Connect the other end of the power cable to an electrical supply of 85 to 264 VAC 47 to 440 Hz 2001 DH Instruments Inc Page 10 PPCK Operation and Maintenance Manual DHI e 234 CONNECTING THE HIGH PRESSURE SUPPLY SUPPLY PORT The SUPPLY port is for connection of the high pressure gas that PPCK controls Using a pressure connecting hose or rigid tube of appropriate pressure rating connect the pressure supply to the SUPPLY port on the rear panel of PPCK The SUPPLY connection is DH200 F wii DH200 F is a gland and collar type fitting for coned and left hand threaded 1 4 in 6 mm OD tube equivalent to AE SF250C HIP LF4 etc DO NOT USE INCORRECT FITTINGS DAMAGE TO THE FITTING AND DANGER TO THE OPERATOR COULD RESULT The supply pressure should be equal to the maximum PPCK range 5 The supply pressure must be stable 1 for PPCK pressure control to operate within specifications see Section 1 2 3 E Never connect a pressure supply greater than 20 over the maximum r
9. Operation and Maintenance Manual 3124 AUTOMATED PRESSURE CONTROL MODES PPCK automated pressure control provides automated adjustment and control of pressure to a user designated target value This feature allows pressure values to be set precisely by simple numerical entry Pressing SET P from the main run screen allows a pressure control target value to be entered and executed Pressing ESCAPE or a manual pressure control key causes active pressure control to be interrupted see Section 3 1 2 2 PPCK supports two pressure control modes to meet different pressure setting and controlling requirements The two control modes are designated static and dynamic Pressure control parameters for each control mode are automatically set to optimal default values for each PPCK range when the control mode is selected in the active range see Sections 3 2 1 3 2 3 If desired control parameters can be customized by the user using the CUSTOM CONTROL function see Section 3 2 6 Control parameters e Target Value The pressure setpoint specified by the operator e Hold Limit A symmetrical positive and negative limit around the target value within which the controlled pressure is to be maintained e Stability Limit A rate of change of pressure limit in units of pressure second used as a criterion for the Ready Not Ready condition in static control or when automated control is not active See STATIC CONTROL and DYNAMIC CONTROL in this section
10. Query reply 0 01 FS Example Sent RES 01 classic Reply 0 01 FS Errors ERR 6 The argument is invalid See Also 3 2 9 RESET Purpose Reset the user s settings to factory defaults Command RESET Classic RESET Remarks The PPCK has user settings units resolution control modes etc that can be reset to factory defaults Communications settings will not be affected The remote RESET program message corresponds to the local Reset sets function see Section 3 4 4 5 Reset Sets The reset cycle takes up to 10 seconds to complete Remote communications should not take place during this period Example Cmd sent RESET enhanced Reply RESET no reply if IEEE 488 Example Sent RESET classic Reply RESET See Also 3 4 4 5 2001 DH Instruments Inc Page 96 PPCK Operation and Maintenance Manual DHI e RETURN Purpose Start a new generation using the current target pressure Command RETURN Classic RETURN Remarks The RETURN program message will start a new pressure generation using the current settings and target pressure Generation will continue until a new target pressure is set the PPCK goes into LOCAL mode or an ABORT program message is executed Example Cmd sent RETURN enhanced Reply 1000 000 kPaa no reply if IEEE 4
11. This ensures that the PPCK has completed the program message Most remote program messages will return a reply within 500 ms except PR PRR SR ATM RATE Up to 2 0 seconds to allow a new measurement The syntax and format used for each program message in the classic mode is listed next to the keyword Classic in each program message summary in Section 4 4 4 43 22 ENHANCEDPROGRAMIMESSAGE FORMAT This enhanced program message format uses the IEEE Std 488 2 format syntax and status reporting and is recommended for new applications Errors are reported using the IEEE Std 488 2 status reporting model If an error is reported the error is put into an Error Queue and the ERR query program message can be used to get a text description of the most recent error If you are using the IEEE 488 port the service request line can be setup to be asserted if this occurs see Section 4 5 2 There are two possible program message types for every program message Each of these two types starts with the same basic text referred to as the program message header Page 71 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 4321 ENHANCED PROGRAMMESSAGE USING THE COMMAND TYPE The COMMAND type of program message executes a process and can additionally send data to the PPCK in the form of comma delimited arguments This data is usually a setting of some sort that is stored in the PPCK If data is specified it must
12. ZOFFSETn HI Purpose Read or set the autozero pressure offset ZOFFSET for the current RPT range and measurement mode PPCK has only a Hi RPT Command ZOFFSETn HI offset Date Query ZOFFSETn HI Classic ZOFFSETn HI offset Date ZOFFSETn Hl Defaults ZOFFSET HI 0 0 800101 Arguments n The RPT range 1 for the low 2 for the medium 3 for the high range of the selected RPT always Hi RPT in PPCK offset The RPT pressure offset ZOFFSET for the current measurement mode gauge or absolute in Pa Date The date when the last edit to the offset was made Remarks The pressure offset ZOFFSET for the specified RPT always Hi RPT in PPCK and RPT range low medium or high in the current measurement mode can be accessed with this program message There is a separate offset for gauge and absolute measurement modes Using this program message will overwrite the current offset so caution must be used Changes made using this program message will take effect immediately Example Cmd sent ZOFFSET1 HI 2 1 961201 enhanced Query reply 2 10 Paa 961201 Example Sent ZOFFSET1 Hl 2 1 961201 classic Reply 2 10 Paa 961201 Errors ERR 6 One of the arguments are out of range See Also 3 4 1 2001 DH Instruments Inc Page 106 PPCK Operation and Maintenance Manual DHI ZNATERRn HI Purpose
13. gas booster package includes a DRIVE air regulator and connection 2 3 INITIAL SETUP 231 PREPARING FOR OPERATION To prepare PPCK for check out and operation Remove the plastic caps from the PPCK rear panel pressure connections Remove the protective plastic sheet from the front panel display Install the rubber feet caps onto the bottom case feet if desired 4 Familiarize yourself briefly with the front and rear panel see Section 2 3 2 2001 DH Instruments Inc Page 8 PPCK Operation and Maintenance Manual DHI 232 FRONT ANDREAR PANELS 2321 FRONT PANEL The front panel assembly provides a 2 x 20 vacuum fluorescent display of PPCK operating status and a membrane keypad for local user control HIGH PRESSURE CONTROLLERICALIBRATOR WUC RANGE LEI RO ee A EK Fj kend ai D D E SS AEM PPCK 4 3 1 Display 3 Manual Pressure Control Keys 2 Multi Function Keypad 4 Remote Indicator Figure 1 Front Panel Page 9 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 23 22 REAR PANEL ASSEMBLY The rear panel assembly provides pressure connections communications interfaces the power ON OFF module and product labeling Pressure fittings are internally secured to prevent loosening when making and breaking connections DH DH Instruments Inc 15 14 13 12 11 10 9 7 1 Label Product 9 Pass Through ATM REF 10 32 UNF 2 COM2 Connector 10 DRAIN Port
14. w new PPCK is delivered with PA and PM values set to O and 1 for all ranges This does not mean that the PPCK has not been calibrated For the original factory calibration PA and PM are set to O and 1 and privileged factory coefficients are used for calibration adjustment 5212 SETTING ZNATERR Setting ZNATERR is necessary on RPTs that will be used in the absolute measurement mode It is only needed if the AutoZ function that rezeros the reference transducers between calibrations is to function properly see Section 3 4 1 in absolute measurement mode Setting ZNATERR is procedurally identical to running the AutoZ function see Section 5 2 1 2 but the result is changes to the ZNATERR value rather than the ZOFFSET value The ZNATERR setting procedure is prompted automatically by CalTool software It can also be run separately by pressing SPECIAL and selecting lt 4Internal gt lt 2Cal gt Since ZNATERR is a measurement of the natural disagreement between the PPCK range in absolute measurement mode and a barometric reference the PPCK range must be calibrated and new PA and PM applied BEFORE ZNATERR is determined Ass ZNATERR must reflect the natural error between the RPT and ZSTD at the time the reference transducer is calibrated the run ZNATERR function should not be executed between calibrations Only the AutoZ function should be used to rezero the reference transducer between calibrations see Section 3 4 1 Page
15. 117 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 5213 ORDER OF OPERATIONS If the PPCK on board barometer is to be used as the source of ZSTD for autozeroing in absolute mode the on board barometer should be adjusted prior to calibrating the PPCK s RPT The ZNATERR determination should be performed AFTER the RPT ranges have been calibrated and new PA and PM values activated 5214 ASRECEIVEDAS LEFT DATA Frequently calibration reports require that as received and as left data be reported The necessary information to report as received and as left data on the calibration of PPCK RPTs can be obtained in several ways When the PPCK CalTool calibration assistance software is used as received data is displayed while running the calibration and is automatically recorded and provided if desired As left data is also calculated and presented At any time with knowledge of pressures applied associated transducer readings PA and PM and ZOFFSET values can be used to calculate as received as left values For example backing out PA and PM on the as left data yields the transducer readings with PA 0 and PM 1 Then applying the as received PA and PM and ZOFFSET values to the readings calculates as received readings the readings that the transducer would have made with the old PA and PM and ZOFFSET A tt is recommended that as received values of PA and PM and ZOFFSET for absolute RPTs if autozero is u
16. 3 It is a high pressure volume containing a helicoidal heating element The TEST and DRAIN ports are machined in to the volume 568 REFERENCE PRESSURE TRANSDUCER RPT A PPCK has a single reference pressure transducer RPT used to measure the high pressure gas the PPCK controls The RPT s basic sensing principle is the measurement of the change in the natural oscillating frequency of a quartz tuning for with temperature and mechanical stress resulting from the change in pressure applied to a connecting bourdon tube Two independent quartz elements are used one is subjected to pressure related stress the other is used only to monitor temperature Every RPT has three ranges 2001 DH Instruments Inc Page 128 PPCK Operation and Maintenance Manual 6 TROUBLESHOOTING PPCK is a sophisticated pressure setting and measuring instrument with advanced on board features and functions 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 PPCK operation This troubleshooting guide is intended as an aid in identifying the reason for PPCK behavior and determining whether the behavior is due to normal operation or an internal or external problem Table 18 Troubleshooting Guide SYMPTOM POSSIBLE CAUSE SOLUTION Will not power up Replace fuse Measured pressure display has Resolution setting needs to
17. 4 4 4 Page 81 2001 DH Instruments Inc PPCK Operation and Maintenance Manual DF Purpose Decrease the pressure at the fast rate Command DF n Classic DF n Arguments 0 Stops the pressure decrease 1 Starts the pressure decrease Remarks The PPCK will set and maintain the fast decrease rate until DF 0 or ABORT is sent Example Cmd sent DF 1 enhanced Reply 1 no reply if IEEE 488 Example Sent DF 1 classic Reply DF 1 Errors ERR 6 The n argument is a 0 or a 1 See Also 3 1 2 2 DS RATES ABORT RS DP Purpose Decrease the pressure a given amount Command DP n Classic DP n Arguments n The decrease in pressure desired current pressure units Remarks The PPCK will set a pressure that is lower than the current pressure by the specified amount Example Cmd sent DP 2 enhanced Reply 2 000 kPa no reply if IEEE 488 Example Sent DP 2 classic Reply 2 000 kPa Errors ERR 6 The n argument is not within given limits See Also 3 1 2 2 IP RATES RS DRVn Purpose Read or set the status of the external electrical driver Command DRVn x Query DRVn Classic DRVn x DV Arguments n The driver to operate This can be from
18. 5 QPRR SR PRR Page 89 2001 DH Instruments Inc PPCK Operation and Maintenance Manual PRR Purpose Read the next available pressure rate and ATM pressure Query PRR Classic PRR Remarks The next available Ready condition RPT pressure rate of pressure change and ambient pressure is replied in the current pressure units Each data field is separated by a comma and is returned in the following order Ready Not Ready pressure UNITS rate UNITS s atm UNITS Here are the field descriptions Ready Not R if the current pressure Ready criteria has been met Ready NR if the criteria has not been met see the SR program message pressure The measured pressure for the selected RPT and range in the current pressure units This is followed by the current pressure units rate The measured rate for the selected RPT and range in the current pressure units per second This is followed by the current pressure units atm The ambient pressure measured by the PPCK on board barometer in the current pressure units but always absolute This is followed by the current pressure units After receiving this program message query the PPCK will reply back with the data once a new pressure measurement cycle is complete This can take up to 1 5 seconds Example Query sent PRR enhanced Query reply R 2306 265 kPaa 0 011 kPa s 97 000 kPaa
19. Byte Register can be read using the STB query or by performing a serial poll on the IEEE 488 bus If you read this using a serial poll then Bit 6 is the RQS If the STB query is used then bit 6 is the MSS bit All of the other bits are common to both types of query 2001 DH Instruments Inc Page 108 PPCK Operation and Maintenance Manual DH Each of these status bits can cause a SRQ to occur The Service Request Enable Register SRE program message determines which of these flags are able to assert the SRQ line This enable register has a matching set of bits that each will enable the designated bit to cause a SRQ except for the RQS MSS bit s which cannot cause a SRQ If you set this register to 20 14 hex an SRQ will occur if the MAV or the ERROR bit are set The description of these bits are given as OPER N A Bit 7 RQS Requested Service Bit 6 Indicates that the SRQ line of the IEEE 488 interface has been asserted by the PPCK This bit is cleared when a serial poll is performed on the PPCK 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 MSS Master Summary Status Bit 6 Indicates that an event or events occurred that caused the PPCK to request service from the Host much like the RQS bit Unlike the RQS bit it is READ ONLY and can be only cleared when the event s that caused the service request are clear
20. Key les fake SSCS LEAK CHECK key lee esky O O O ooo O e e SETUP menu 2D O Ci Seca men ooo Sd BEER e e SPECIAL menu lt 1Autoz gt et SPECIA menu Ziele e SPECIAL menu lt 3Press M o e LISPECIAL menu lt 4mtemas J LISPECIAL menu lt 1Config gt LISPECIAL menu end Jl o LISPECIAL menu lt dinternal gt see et Ile SPECIAL menu lt 4 Internal gt lt 5Resets lt 4cas o LISPECIAL menu lt dinternal gt lt 5Reset gt lt 5als Q OPERATION PPCK is delivered with no active password and open access to the User Level menu The user level is set to 1Low User levels can be changed freely until a password has been created To access the User Level function press SPECIAL and select lt 4Internal gt SENG ERR lt 6Level gt If no password yet exists or if the 0 disables password correct password has been entered The display is Selecting lt 1change gt user level brings up the restriction menu Restriction lnone 2low 3medium 4high You can then select the current restriction level or ESC back to the RUN screen Page 65 2001 DH Instruments Inc 3447 2001 DH Instruments Inc PPCK Operation and Maintenance Manual The second selection lt edit password gt displays the user password and allows it to be edited Passwords can be up to six 2edit password numbers in length and cannot start with a zero lcha
21. Not Ready pressure UNITS rate UNITS s atm UNITS Here are the field descriptions Ready Not R if the current pressure Ready criteria has been met Ready NR if the criteria has not been met see the SR program message pressure The measured pressure for the selected RPT and range in the current pressure units This is followed by the current pressure units rate The measured rate for the selected RPT and range in the current pressure units per second This is followed by the current pressure units atm The ambient pressure measured by the PPCK internal barometer in the current pressure units but always absolute This is followed by the current pressure units Example Query sent QPRR enhanced Query reply R 2306 265 kPaa 0 011 kPa s 97 000 kPaa Example Query sent QPRR classic Reply R 2306 265 kPaa 0 011 kPa s 97 000 kPaa See Also PR PRR SR ATM RATE 2001 DH Instruments Inc Page 92 PPCK Operation and Maintenance Manual e RANGE Purpose Read or change the active RPT range Command RANGE n XX Query RANGE Classic RANGE n Xx RANGE Default RANGE 3 HI Arguments n T for the low range of the selected RPT 2 for the mid range of the selected RPT 3 for the high range of the selected RPT XX LO for the low pressure RPT
22. PPCK autozero function can be turned ON and OFF Example Cmd sent AUTOZERO 1 enhanced Query reply 0 If autozero OFF 1 autozero ON Example Sent AUTOZERO 1 classic Query reply AUTOZERO 1 lf autozero ON Errors ERR 6 The argument was other than a 0 or a 1 See Also 3 4 1 2001 DH Instruments Inc Page 78 PPCK Operation and Maintenance Manual DHI e CAL AMR Purpose Read or set the user ambient pressure RPT calibration Command CALAMB adder mult Query CALAMB Classic CALAMB adder mult CALAMB Arguments Adder The pressure adder Always in Pa mult The pressure multiplier Defaults CALAMB 0 00 1 0000000 Remarks The user ambient calibration can be used to allow the user to calibrate the PPCK s internal ambient pressure calibration Example Cmd sent CALAMB 45 1 00021 enhanced Query reply 0 45 Pa 1 000210 Example Sent CALAMB 45 1 00021 classic Reply 0 45 Pa 1 000210 Errors ERR 7 Missing or improper program message argumenit s See Also 3 4 4 2 5 3 CAL CAL Purpose Read or set the user RPT pressure RPT calibration Command CAL adder mult Query CAL Classic CAL adder mult CAL Arguments Adder The pressure adder Always in the current units mult The pressure mul
23. Query reply 1 if PPCK condition has stayed Ready 0 if PPCK condition has NOT stayed Ready Errors ERR 6 Argument is not a 0 or a 1 See Also 3 1 2 5 SR REMOTE Purpose Lock out the front panel controls Command REMOTE Classic REMOTE Remarks The PPCK 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 is by using the LOCAL program message the IEEE 488 GTL command or by cycling the PPCK power Example Cmd sent REMOTE enhanced Reply REMOTE no reply if IEEE 488 Example Sent REMOTE classic Reply REMOTE See Also LOCAL Page 95 2001 DH Instruments Inc PPCK Operation and Maintenance Manual RES Purpose To read or set the pressure display resolution for the current RPT and range Command RES n Query RES Classic RES n RES Default RES 0 001 Arguments n The pressure display resolution in FS of the current RPT range 0 0001 to 1 FS Remarks The pressure display resolution is defined as FS of the selected RPT range The setting is separate for each range and will change as the range is changed Example Cmd sent RES 01 enhanced
24. SR Purpose Read the next available Ready Not Ready status Query SR Classic SR Remarks The current Ready status can be read using this program message NR The pressure is Not Ready within the limits defined by the control mode and current control parameters R The pressure meets the Ready criteria The status is replied when the next pressure measurement is finished ER The previous request pressure generation failed to complete due to failure of the hardware leaks gas supply or valve failures OL The pressure has exceeded the user specified upper limit Only decreasing pressure excursions will be allowed Op The pressure has exceeded the factory maximum pressure limit Normal operation cannot continue Example Query sent SR enhanced Query reply NR Example Sent SR classic Reply NR See Also 3 1 2 5 3 2 3 3 1 2 4 PR PRR HS SS SS Purpose Read or set the current stability limit Command SS n Query SS Classic SS n SS Arguments n The stability limit in FS of the current active range Remarks The stability limit can be read and set as a percent of the full scale range of the RPT If this program message is used to set the stability limit the PPCK will then use CUSTOM control settings Example Cmd sent SS 1 enhanced Query reply 0 10 Example Sent SS 1 classic Reply 0 10 Errors ERR 6
25. Section 3 4 4 3 Select lt 4Time gt to adjust the date and time see Section 3 4 4 4 Select lt 5Reset gt to access various system reset functions see Section 3 4 4 5 Select lt 6Level gt to set the user protection level and password see Section 3 4 4 6 Select lt 7Atm gt to view the on board barometer reading see Section 3 4 4 7 Select lt 9ScrSav gt to adjust the activation time of the front panel display saver see Section 3 4 4 8 3441 Q CONAIG PURPOSE To run an automated routine that determines the volume of the system into which PPCK is controlling pressure to optimize the performance of thermal pressure control TPC used in dynamic control mode PRINCIPLE PPCK uses thermal pressure control TPC for very fine pressure control around the target value in dynamic control mode see Section 3 1 2 3 For optimal TPC operation PPCK must have a good estimation of the size of the volume connected to the PPCK TEST port In normal dynamic control mode operation if PPCK s estimation of the volume seems incorrect as evidenced by unexpected control response PPCK runs a 0 5 to 2 5 minute routine to determine the test volume The volume determination routine can also be initiated by the operator using SPECIAL 4Internal 1Config The operator initiated volume determination routine can be useful after a test volume change to avoid the increased control time and reduced control precision that may exist unt
26. The argument was invalid See Also 3 1 2 5 3 1 2 4 3 2 3 3 2 6 SS Page 99 2001 DH Instruments Inc PPCK Operation and Maintenance Manual SS Purpose Read or set the current stability limit Command SS n Query SS Classic D n Sg Arguments N The stability limit in the current pressure units Remarks The stability limit can be read and set as a pressure If this program message is used to set the stability limit the PPCK will then use CUSTOM control settings Example Cmd sent SS 1 enhanced Query reply 0 10 kPa s Example Sent SS 1 classic Reply 0 10 kPa s Errors ERR 6 The argument was invalid See Also 3 1 2 5 3 1 2 4 3 2 3 3 2 6 SS STAT Purpose Read the pressure generation status Query STAT Classic STAT Remarks The generation cycle status can be checked using this program message The reply is a numeric code which references a specific generation action Multiple codes are returned by logically ORinging them together 0 The system is not generating or holding a pressure 2 A new generation has been requested 4 The generation is preparing to begin 8 Valve is adjusting close to it s opening position 16 Valve is seeking it s exact opening position 256 Valve is being used to reach the target 512 Volume determination routine is running 1024 Va
27. U The height units This must be in or cm G The gas type This must be N2 Air or He Remarks The PPCK can make a head correction to allow it to display the pressure at the test instead of the pressure at the PPCK Example Cmd sent HEAD 10 in N2 enhanced Query reply 10 in N2 Example Sent HEAD 10 in N2 classic Reply 10 in N2 Errors ERR 6 The arguments are not within given limits See Also 3 2 7 3 4 2 HS Purpose Read or set the hold limit for automated pressure control Command HS nm Query HS Classic HS n HS Arguments n The hold limit in the current pressure units Remarks The hold limit can be read and set as a pressure Example Cmd sent HS 1 enhanced Query reply 0 1 kPa Example Sent HS 0 1 classic Reply 0 1 kPa Errors ERR 6 The n argument was invalid See Also 3 1 2 3 3 1 2 4 3 1 2 5 3 2 3 3 2 6 HS 2001 DH Instruments Inc Page 84 PPCK Operation and Maintenance Manual DHI HS Purpose Read or set the hold limit for automated pressure control in percent of range full scale Command HS n Query HS Classic HS n HS Arguments N The hold limit in FS of the current active range Remarks The hold limit can be read and set as a pressure or as a perc
28. a sump to trap small quantities of liquids that may return to PPCK from the system connected to the TEST port The PPCK is delivered with a plug installed in the DRAIN port and the port is left plugged during normal operation The DRAIN port should occasionally be purged by slowly opening the fitting with approximately 700 kPa 100 psi trapped in the PPCK see Section 5 4 The PPCK DRAIN connection is DH200 F w l DH200 F is a gland and collar type fitting for coned and left hand threaded 1 4 in 6 mm OD tube equivalent to AE SF250C HIP LF4 etc DO NOT USE INCORRECT FITTINGS DAMAGE TO THE FITTING AND DANGER TO THE OPERATOR COULD RESULT 23 10 THE ATMPORT BAROMETER The ATM pass through is connected to the on board barometer The ATM pass through assures that the on board barometer is exposed to atmospheric pressure rather than to the pressure inside the PPCK case which may be slightly different from atmospheric pressure For calibration or verification of the on board barometer through the ATM port a pressure reference may be connected The ATM REF port connection is 10 32 UNF F Do not plug or obstruct the ATM REF pass through as this may adversely affect GAUGE mode operation NEVER connect a pressure greater than 110 kPa ABSOLUTE 16 5 psia to the ATM REF port or damage to the on board barometer may result Page 13 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 2 4 POVWER UP AND VERI
29. air pressure to 700 kPa 100 psi 2 3 6 Correct leak Compare differences observed to tolerances on reference pressure transducer measurements 1 2 2 1 PPCK Operation and Maintenance Manual Table 18 Troubleshooting Guide Continued SYMPTOM POSSIBLE CAUSE SOLUTION Disagreement between measurements made by different ranges at the same pressure is not zero but an autozero routine was just executed Will not accept command to set pressure Poor pressure control Poor pressure control in dynamic control mode characterized by hunting around target Poor pressure control characterized by control not locking on target pressure Poor pressure control characterized by Ready condition occurring when the pressure is not at the target value Poor pressure control when setting zero absolute pressure characterized by Ready condition occurring when vented at atmospheric pressure Poor pressure control characterized by excessive overshooting and or undershooting inability to lock on target Readings by different ranges at the same pressure in absolute measurement mode can disagree even after a valid autozero due to ZNATERR Target exceeds UL and or current range Check that ZOFFSET value is in tolerance and verify value of ZNATERR 3 4 1 1 2 2 1 5 2 6 Check UL 3 2 4 and range 3 2 1 High pressure supply is not of the Connect correct pressure supply correct value or excessi
30. and reading in the same pressure units when AutoZ was run When the run AutoZ selection is made if a HEAD correction is currently active see Section 3 2 7 the head correction will be disabled to avoid autozeroing the head value w l The value of ZOFFSET in absolute mode will not be exactly equal to the difference between the current reading and ZSTD if ZNATERR is not zero see Section 3 4 1 PRINCIPLE How AutoZ Works w l The value of ZOFFSET is always displayed and entered in Pascal Pa 2001 DH Instruments Inc Page 52 PPCK Operation and Maintenance Manual DHI Run Autoz By Entry Absolute Mode Onl AutoZ by entry allows the value of ZSTD see Section 3 4 1 PRINCIPLE How AutoZ Works to be entered manually This provides a simple way of autozeroing relative to an independent reference device such as a house barometer that does not interface directly with PPCK To access run AutoZ by entry press SPECIAL and select lt 1AutoZ gt lt 4run gt lt 1Entry gt The display is 1 2 F E 1 Pressure reading units and mode of the active 14 10 psi a H3 RPT range ZSTD 0 0000 2 Active range indicator 3 Entry field for the value of ZSTD y Enter the value of ZSTD in the current units Old ZOFFSET The next display is New ZOFFSET The new ZOFFSET is the ZOFFSET calculated from this execution of run AutoZ Press ENTER to activate the new ZOFFSET for the current range absolute measur
31. be too much not enough resolution changed The pressure units available under the UNIT function key are not the ones you want Front panel keys seem to be disabled Front panel display is dim Cannot access certain functions gt ACCESS RESTRICTED lt UNIT function needs to be customized lt Remote gt command has been sent from a host computer Screen saver option has activated User levels have been set that restrict access to certain functions Page 129 Use RES to change resolution setting 3 2 9 Use SPECIAL lt 3PresU gt to customize the UNIT function 3 2 2 or reset units to default 3 4 4 5 Reset Units Send lt local gt command from host computer or cycle PPCK power 4 4 Press any key to resume full screen power Adjust screen saver delay time if desired 2 4 4 8 Change user level or consult system manager 3 4 4 6 2001 DH Instruments Inc PPCK Operation and Maintenance Manual Table 18 Troubleshooting Guide Continued SYMPTOM POSSIBLE CAUSE SOLUTION Displays lt FATAL ERROR gt or lt FATAL FAULT gt There is a lt C gt to the right of the lt D gt or lt S gt control mode character on the bottom line of the display and it won t go away Pressure display is flashing and beeper is sounding Pressure display is flashing no buzzer is sounding and manual pressure control keys are inactive A Ready indication is never achieve
32. calibration facility It allows access and editing in all areas including critical metrological information This level of security is designed to protect the specific metrological information and system diagnostic and maintenance functions of the system It is intended for an advanced operator performing many different tasks This level of security is designed to protect specific metrological information in the system and to assure that the PPCK is operated using consistent operational parameters This level of security is designed to protect all operating parameters It is intended to minimize operator choices for example to perform repeated identical calibrations under consistent conditions d PPCK is delivered with the security level set at low to avoid inadvertent altering of critical internal settings but with access to changing security levels unrestricted It is recommended that the low security level be maintained at all times If there is a risk of unauthorized changing of the security level changing authority should be password protected see OPERATION of this Section 2001 DH Instruments Inc The security levels are structured to support typical levels of operation as shown in Table 9 Specifically the security levels prevent execution of the X d functions Page 64 PPCK Operation and Maintenance Manual DHI Table 9 Security Levels C Eemer meio GH Tuut e ll te le oe le ep Me le CUSTOM CONTROL
33. caused by invalid control parameters excessive leaks and restrictions in the test line or other set up problems Along with purging the PPCK drain these potential problems should be identified and eliminated when troubleshooting poor pressure control see Section 3 1 2 3 To purge the PPCK DRAIN port proceed as follows Plug the TEST port or connect it to a leak free system Use the PPCK increase pressure direct pressure control key see Section 3 1 2 2 to set a pressure of approximately 700 kPa 100 psi Using a 1 2 in wrench slowly loosen the DH200 gland nut on the DRAIN port on the rear panel of PPCK Gas will escape from the port Observe the exhaust from the DRAIN port If liquids and or bubbles can be seen or heard there is liquid in the drain port Tighten the DH200 gland nut to shut the DRAIN and repeat Steps through until dry gas blows out of the DRAIN port RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY PPCK uses FLASH memory This allows the embedded software that controls PPCK operations and functions to be loaded into PPCK over its COM1 port from a personal computer with a simple FLASH loading utility To replace corrupted software or upgrade your software access the DHI worldwide web site at www dhinstruments com and go to the SOFTWARE section A FLASH loading utility and the latest PPCK software are available for download at no charge If you do not have access to the web or have difficult
34. classic Reply 0 A3000 psi 1000 2000 3000 1000 2000 3000 See Also 3 1 2 6 RANGE Page 93 2001 DH Instruments Inc PPCK Operation and Maintenance Manual RATE Purpose Read the next available pressure rate of change Query RATE Classic RATE Remarks The next available pressure rate of change in the current pressure units per second is returned After receiving this program message the PPCK will reply back with the data once a new pressure measurement cycle is complete This can take up to 1 5 seconds Example Query sent RATE enhanced Query reply 0 01 kPa s Example Sent RATE classic Reply 0 01 kPa s See Also 3 1 2 5 PRR QPRR RATES Purpose Read or change the fixed rate generation slow and fast rates Command RATES FastRate SlowRate Query RATES Classic RANGE FastRate SlowRate RANGE Default Range dependent Arguments FastRate The rate set units s when the manual up or down and fast keys are pressed or when a PSF IF 1 or DF 1 command is executed SlowRate The rate set units s when the manual up or down key is pressed or when a PSS IS 1 or DS 1 command is executed Remarks The PPCK executes fixed rate generations using one of these two target rates It will maintain the rate until the user aborts t
35. coefficients if needed 5 2 Check value of ZOFFSET Rerun autoZ with a valid ZSTD reference 3 4 1 Check measurement mode setting and current value of atmospheric pressure if absolute 3 2 2 Check that high pressure valve drive air supply is connected and of correct pressure 2 3 6 2001 DH Instruments Inc PPCK Operation and Maintenance Manual NOTES 2001 DH Instruments Inc Page 134 PPCK Operation and Maintenance Manual 7 APPENDIX 7 1 DRIVERS The PPCK drivers option provides eight open collector drivers for operating external valves solenoids indicators etc When operating from the setup driver screen see Section 3 3 4 pressing enter will allow the operating mode of the drivers to be set The two modes of operation are Momentary and Toggle A momentary driver will change state while the corresponding driver number on the keyboard is being pressed In toggle mode the driver state will toggle each time the corresponding key is pressed and released Each output can sink 500 mA at 12 V However the total output of all the activated drivers cannot exceed 1 Amp Therefore if multiple drivers are being activated please refer to the following chart as a guide Table 19 Driver Output OF ACTIVE MAX CURRENT DRIVERS PER OUTPUT pt EE 400 mA 275 mA ee so The male connector P N 401382 for the DRIVERS port is an optional PPCK accessory Page 135 2001 DH Instruments Inc H
36. factors used by PPCK INTERNAL PURPOSE To view set adjust and maintain various aspects of PPCK s internal operation including lt 1Config gt to run the thermal pressure control volume determination routine see Section 3 4 4 1 lt 2Cal gt to view and edit calibration coefficients for the PPCK RPT ranges and on board barometer see Section 3 4 4 2 lt 3Remote gt to view and edit RS232 COM port and IEEE 488 interface settings see Section 3 4 4 3 lt 4Time gt to adjust the date and time see Section 3 4 4 4 lt 5Reset gt to access various system reset functions see Section 3 4 4 5 lt 6Level gt to set the user protection level and password see Section 3 4 4 6 lt 7Atm gt to view the on board barometer reading see Section 3 4 4 7 lt 8ScrSav gt to adjust the activation time of the front panel display saver see Section 3 4 4 8 lt 9Log gt to view and or clear the PPCK event log OPERATION To access the internal selections press SPECIAL and select lt 4Internal gt The display is 1Config 2Cal 3Remote 4Time 5Reset 6Level 7Atm 8ScrSav 2001 DH Instruments Inc Page 56 PPCK Operation and Maintenance Manual DHI Select the desired internal function Select lt 2Cal gt to view and edit calibration coefficients for the PPCK RPT ranges and on board barometer see Section 3 4 4 2 Select lt 3Remote gt to view and edit RS232 COM port and IEEE 488 interface settings see
37. gt for static lt D gt for dynamic lt M gt for manual with lt C gt appended if custom control settings are in use See Section 3 1 1 sl dynamic control mode whenever the pressure is Ready inside the hold limit the display of measured pressure is equal to the target pressure This is because in dynamic control mode when the pressure is Ready it is assumed that the measured pressure equals the target pressure This is not true when setting zero in absolute measure mode see Section 3 2 10 1 Page 33 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 3231 SYSTEMDEFAULT CONTROL PARAMETERS Default control parameters for the control mode are automatically set whenever the control mode is selected Table 7 Default Pressure Control Parameters DYNAMIC CONTROL MODE STATIC CONTROL MODE HOLD LIMIT STABILITY LIMIT HOLD LIMIT STABILITY LIMIT 0 01 FS of active 0 005 FS sec of 1 FS of active 0 005 FS sec of pressure range active pressure range pressure range active pressure range 3232 EXECUTING AUTOMATED PRESSURE CONTROL COMMANDS O PURPOSE To use the automated pressure control functions of PPCK to set target pressure values O OPERATION See Section 3 2 10 3 24 UL UPPER LIMT O PURPOSE To set the upper limit pressure value for a pressure range and measurement mode O PRINCIPLE The UPPER LIMIT function allows the setting of a maximum pressure not to be exceeded when us
38. it will time out and display lt RPM not detected gt wl The value of ZOFFSET is always displayed and entered in Pascal Pa 342 HEAD O PURPOSE To specify the configuration of the HEAD function see Section 3 2 7 including the length unit of measure for head height entry and the test gas species for head pressure calculations O OPERATION From the main run screen press SPECIAL and Head height unit select lt 2Head gt The display is lin 2cm G is a Select the desired head height unit The next AR IPSS display is 1N2 2He 3Air Select the type of gas that is being supplied to PPCK The characteristics of the gas selected will be used by PPCK in calculating head pressures 2001 DH Instruments Inc Page 54 PPCK Operation and Maintenance Manual DHI 343 PresU PURPOSE To customize the selection of pressure units that are available for selection from the UNIT function key PRINCIPLE The UNIT function key makes available a choice of six default pressure units US or SI units depending on whether the PPCK has been factory set as US or SI see Section 3 2 2 PPCK also supports many commonly used units other than those included in the default set up These units can be made available for active selection by customizing the UNIT function using SPECIAL lt 3PresU gt This allows PPCK to offer a very wide selection of units while simplifying day to day operation The typical user will customize the UNIT
39. lt to increase the target value or Am decrease the target value Each time lt or gt is pressed the target value is adjusted up or down by the current value of the hold limit each time the key is pressed Use CUSTOM CONTROL to adjust the hold limit see Section 3 2 6 weil It will take several seconds after the pressure control target value has been adjusted for PPCK to respond Page 45 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 3 3 SETUP M NU KEY O PURPOSE The SETUP menu key accesses a menu of functions and features commonly used in setting up PPCK for use O OPERATION Press the SETUP key from the main run screen to access e DDr ar the SETUP menu The display is a 33 1 SEQUENCE O PURPOSE Not supported in PPCK 33 2 DRIVERS O PURPOSE To control the output signals of PPCK s 8 channel 12 V external drivers O PRINCIPLE PPCK external drivers are available to drive peripheral equipment for example solenoid valves in a system that includes PPCK The driver electrical connections are available from a rear panel connector well See Section 7 1 for driver specifications and pin outs OQ OPERATION To access the driver control function press SETUP and select lt 4drivers gt The display Es External drivers di 2 3 4 5 6 7 8 Pressing the keypad numerical key driver number turns that driver ON and OFF with either a momentary or a toggled response see ne
40. lt M gt for manual with a lt C gt appended if custom control settings are in use Shows lt VLV gt when the inlet or exhaust valve is in its opening routine see Sections 3 1 2 3 3 1 2 4 The control mode indicator characters flash when the system is controlling pressure see Sections 3 2 3 3 2 6 PRESSURE2 Numerical sign and value of either target pressure lt T gt rate of change of pressure lt R gt or deviation from target lt D gt Target value and deviation are in the current pressure unit of measure Rate of change of pressure is in current unit per second see Section 3 2 3 Page 17 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 11 Indicates whether the number following is target pressure lt T gt rate of change of pressure lt R gt or current deviation from target value lt D gt see Section 3 2 3 Target pressure lt T gt is indicated when e Dynamic control is active and pressure is Not Ready e Static control is active and pressure is outside of the hold limit Deviation lt D gt is indicated when e Dynamic control is active and pressure is Ready Rate of change lt R gt is indicated when e No control is active e g control is suspended or system is vented e Static control is active and pressure is inside the hold limit w i PPCK 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
41. panel will dim after a period of keyboard and remote inactivity Setting this value to 0 will disable this feature Example Cmd sent SCRSAV 30 enhanced Query reply 300 Example Sent SCRSAV 30 classic Reply 300 Errors ERR 6 The argument was invalid See Also 3 4 4 8 SETS Purpose Set or read the control settings to use Command SETS type Query SETS Classic SETS type SETS Arguments Type SYS Set the generation settings to the factory defaults USER Allows user specified custom generation settings Remarks This command allows the user to set the generation hold and stability settings to factory defaults or to use user specified hold and stability settings Example Cmd sent SETS SYS enhanced Query reply SYS Example Sent SETS USER classic Reply USER Errors ERR 6 Incorrect argument See 3 1 2 4 3 2 6 HL HL SS SS SN Purpose To read the serial number of the PPCK Query SN Classic SN Remarks The PPCK is serialized The serial number can be read using this program message Example Query sent SN enhanced Query reply 321 Example Sent SN classic Reply 321 See Also None 2001 DH Instruments Inc Page 98 PPCK Operation and Maintenance Manual DHI e
42. pressure control unit TPCU volume O PRINCIPLE PPCK is designed to precisely measure set and control gas pressures Liquid contamination of the PPCK internal pneumatic control module and or reference pressure transducer can cause poor pressure control and interfere with pressure measurement Liquid contaminants that may be present in test devices or systems that are connected to the PPK TEST port are likely to make their way back to PPCK s internal pneumatic system as the test device or system is pressurized and depressurized by PPCK To every extent possible only clean hoses and connections should be used in connecting PPCK to test devices or systems and those devices and systems should be free of contaminants 2001 DH Instruments Inc Page 124 PPCK Operation and Maintenance Manual DHI 5 5 e In the event that PPCK is used to test some devices or systems that contain small amounts of liquid contaminant PPCK has been designed to protect itself from contamination PPCK s thermal pressure control unit TPCU is designed as a trap for liquids that may make their way into PPCK The bottom of the volume is the low point see Figure 5 of the system and a DRAIN port is provided on the rear panel to exhaust collected contaminant The procedure described under OPERATION below should be conducted regularly whenever PPCK may have been connected to a source of contamination OPERATION A Poor pressure control is usually
43. previous leak test results Pressing ENTER or ESCAPE returns to the main run screen w i In both dynamic and static pressure control mode abort control and wait at least three minutes before conducting a leak check wl Leak check is range specific in the sense that leak check is run using the active range However only one set of leak check results is maintained in memory and each leak test completed overwrites the memory View leak check always shows the results of the last leak check run regardless of the range that is now active The results screen includes the range indicator to indicate the range in which the leak check was run Press lt 1run gt to run a leak check and or to edit the leak check time The display is Set leak check time 1 Edit field for leak check time in seconds 1 min 999 max Edit the leak check time if desired Press ENTER to run leak test The display is 5458 55 psi a zH3 Leak testing 13 s jl Pressing ESCAPE during the countdown offers a leak check abort option to return to the main run screen or continue leak test Pressing ENTER during the leak check countdown causes the countdown to restart 1 Standard main run screen first line 2 Indication that leak test is running and countdown of time s remaining 2001 DH Instruments Inc Page 40 PPCK Operation and Maintenance Manual DHI 329 Once the leak check countdown has completed the results screen is display
44. standard uncertainty of 0 005 of reading F The influence of the dynamic compensation for atmospheric pressure in gauge mode measurement is less than 2 5 Pa 0 00035 psi Page 3 2001 DH Instruments Inc PPCK Operation and Maintenance Manual 1222 ON BOARD BAROMETER The on board barometer is NOT used as a source of absolute accuracy It is ONLY used to measure changes in atmospheric pressure between zeroing opportunities to provide dynamic compensation of the RPTs atmospheric pressure offset when making gauge pressure measurements 123 PRESSURE CONTROL SPECIFICATIONS oF All values are FS of the active range unless otherwise indicated Modes and Ready Indication Static Sets pressure within hold limit and maintains rate of Control Parameters Control Precision Normal Test Volume Control Speed Minimum Pressure Minimum Controlled Pressure Delivered Pressure Uncertainty change lower than stability limit Pressure is Ready when within hold limit and rate of change is less than stability limit Dynamic Sets pressure within hold limit and continuously adjusts as close as possible to target Pressure is Ready when within hold limit Hold limit stability limit optimum values set by default can be customized independently for each measurement range 0 003 0 01 default dynamic control hold limit PPCK A3000 0 to 500 cc 100 cc optimal PPCK A6000 0 to 200 cc 50 cc optimal PP
45. the RSB bit of the Status Byte Register causing a SRQ to occur IF the RSB bit is enabled to do so The Standard Event Status Enable Register RSE program message determines which of these flags are able to assert the RSB bit The description of these bits are given as e MEAS Measurement ready Bit 2 Indicates that the PPCK has completed an RPT measurement e NRDY Generation Not Ready Bit 1 Indicates that the PPCK made a transition from Ready to Not Ready as defined by the control settings see Section 3 1 2 5 e RDY Generation Ready Bit 0 Indicates that the PPCK has reached a target pressure and is Ready as defined by the control settings see Sections 3 1 2 4 3 1 2 5 and 3 2 3 4 6 IEEE STD 488 2 COMMON AND STATUS PROGRAM MESSAGES The PPCK 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 These command also cover the status reporting commands See Section 4 5 for details on the status registers mentioned in these commands Table 17 Program Message List ESE Read or set the Standard Event Status Enable Register ESR_ Read the Standard Event Status Register _ DN Identify the PPCK version range and serialnumber SRE Read or set the Service Request Enable Dese RSE Read or set the Ready Status Enable Register RSR_ Reads the Ready
46. the current range to be set to either static control or dynamic control see Section 3 1 2 4 The control mode is specific to the active range and is maintained with the range when ranges are changed When the control mode is selected using the CONTROL function CONTROL parameters are set to system default parameters The default control parameters have been determined to be those most suitable for the typical user to operate within PPCK pressure control and measurement specifications see Section 3 2 3 1 H desired control mode parameters can be customized using the CUSTOM CONTROL function see Section 3 2 6 For a complete description of the operation and purpose of static and dynamic control modes see Section 3 1 2 4 O OPERATION Active Range To select the control mode for the active range and E set control parameters to the default control Control mode H3 parameters press the CONTROL function key dynamic Zstatic from the main run screen The display is Selecting lt 1static gt or lt 2dynamic gt causes the selected pressure control mode to be activated with default control parameters and returns to the main run screen weil The control mode setting is range specific A change in control mode made while in one PPCK range does NOT affect the control mode setting in other ranges see Section 3 2 1 1 w i The current control mode is indicated by two characters in the middle of the bottom line of the main run screen lt S
47. the entire user section of non volatile memory These include e Reset sets e Reset units e Reset seq e Reset cal e Reset Comi Com2 and JEEE 488 interface to defaults see Section 3 4 4 3 sl None of the reset options affects the user level protection settings see Section 3 4 4 6 LEVEL PURPOSE To set user protection levels to restrict access to certain functions and to edit the password required for changing user levels PRINCIPLE PPCK s front panel user interface provides the means to access all PPCK user defined data settings and functions including calibration data Inadvertent uninformed or unauthorized altering or deleting of data settings and functions could require extensive reconfiguration by the user and might cause invalid readings and behavior For these reasons depending upon the application in which PPCK 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 Four different levels of security are available Access to changing security levels can be left open or be protected by a password Page 63 2001 DH Instruments Inc PPCK Operation and Maintenance Manual Security Levels The security levels are structured to support typical operating environments as follows None Low Medium High This level is intended for use only by the system manager and or
48. values are FS of the active range unless otherwise indicated Warm Up Time Resolution Temperature Effect Acceleration Effect Measurement Precision Predicted Stability Measurement Uncertainty 30 minutes for best performance To 1 ppm user settable by individual range Fully compensated from 0 to 50 C with active independent temperature measurement 0 005 maximum temperature effect in normal ambient 15 to 35 C operating range 0 008 g maximum worst axis Allows operation at 20 from reference plane without significant effect 0 01 90 day 1year Gauge Mode w Autozero 0 003 0 009 Absolute Mode w Autozero 0 003 0 009 Absolute Mode w out Autozero 0 006 0 015 90 day year Gauge Mode w Autozero 0 012 0 015 Absolute Mode w Autozero 0 012 0 015 Absolute Mode w out Autozero 0 015 0 020 1 Measurement Precision Combined linearity hysteresis repeatability of measurements made by the reference pressure transducer 2 Predicted Stability Maximum change in zero and span over specified time period for typical RPT used under typical conditions As stability can only be predicted and varies from RPT to RPT stability for a specific RPT should be established from experience 3 Measurement Uncertainty Maximum deviation of the reference pressure transducer indication from the true value of measured pressure including precision stability temperature effect and calibration
49. which can be viewed by pressing ESCAPE from the main run screen or when powering up PPCK For a US PPCK the default units are lt lpsi gt lt 2MPa gt lt 3kPa gt lt 4bar gt lt 5kcm2 gt For an SI PPCK the default units are lt 1MPa gt lt 2kPa gt lt 3bar gt lt 4psi gt lt Skem2 gt w i No reference temperature selection is necessary for the unit mmWa as the only reference temperature commonly used for mmWa is 4 C F the pressure measurement unit selected is range specific When in a given range all functions and setting values are represented in the current measurement unit for that range However certain internal and or metrological functions e g RPT calibration coefficients are always represented in Pa regardless of the current range unit w i See Section 7 2 1 for tables of the conversion factors used by PPCK wl The choice of six units available under the UNIT function can be modified from a wider selection by the user see Section 3 4 3 The units available under the UNIT function can be reset to default by pressing SPECIAL and selecting lt 4Internal gt lt 5Reset gt lt 2units gt see Section 3 4 4 5 323 CONTROL O PURPOSE To set the automated pressure control mode for the active range and activate default control parameters 2001 DH Instruments Inc Page 32 PPCK Operation and Maintenance Manual DHI O PRINCIPLE The CONTROL function allows the active control mode for
50. 0298 55 8700 aohte ohtegiken co jp Tel 010 64291994 ext 5 Tel 010 64218637 ext 5 Fax 010 64218703 cxcen mx cei go cn Page 141 Worldwide European Union Japan Asia Peoples Republic of China 2001 DH Instruments Inc PPCK Operation and Maintenance Manual NOTES 2001 DH Instruments Inc Page 142
51. 1 port cannot be supported in such a way so polling must be used 45 1 ERROR QUEUE The PPC 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 O 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 If you are using the enhanced program message format the Error Queue will accumulate errors until full unless they are pulled from the queue If you are using the classic program format the Error Queue is cleared every time a new program message is received Page 107 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 452 STATUS BYTE REGISTER The PPCK contains an 8 bit Status Byte Register that reflects the general status of the PPCK Table 14 8 Bit Status Byte Register 128 64 32 16 8 4 2 1 This register is affected by the PPCK reply output queue the Error Queue the Standard Event Status register and the Ready Event Status register Status Byte Register STB or SRE n 128 Ge E Standard Event Status Register Ee SA E E EE 32 128 16 16 QUEUE ye eee ERROR QUEUE Ready Event Status Register RSR or RSE o 128 64 32 16 Figure 10 Status Register Schematic The Status
52. 1 to 8 X The state to change the driver to 0 to de activate it 1 to activate it Remarks The PPCK control has eight optional external drivers Example Cmd sent DRV1 1 enhanced Query reply 1 Example Sent DRV1 1 classic Reply DRV1 1 Errors ERR 7 The nor x arguments are not within given limits See Also 3 3 2 2001 DH Instruments Inc Page 82 PPCK Operation and Maintenance Manual DHI e DS Purpose Decrease the pressure at the slow rate Command DS nm Classic DS n Arguments n 0 Stops the decrease 1 Starts the decrease Remarks PPCK sets and maintains the slow rate of pressure decrease until DS 0 or ABORT is sent Example Cmd sent DS 1 Enhanced Reply 1 no reply if IEEE 488 Example Sent DS 1 Classic Reply DS 1 Errors ERR 6 The n argument is a 0 or a 1 See Also 3 1 2 2 ABORT IS IF DF RATES RS ERR Purpose Read the new available error message from the Error Queue Query ERR Classic ERR Remarks This program message obtains additional details about an error that has occurred If the user receives an ERR nn reply or the enhanced mode is enabled using the IEEE 488 interface and an error has been detected the
53. 2 8 3 2 6 3 1 2 3 Reduce test volume if slew rate is unacceptable Increase test volume Operation is normal Watch the pressure control characters on the main run screen They indicate lt VLV gt during the valve opening routine 3 1 1 3 1 2 3 Operation is normal Contact DHI Authorized Service Provider Table 22 PPCK Operation and Maintenance Manual Table 18 Troubleshooting Guide Continued SYMPTOM POSSIBLE CAUSE SOLUTION Apparently inaccurate pressure measurement control and lt h gt is displayed on top line of screen Apparently inaccurate pressure measurement control Apparently inaccurate pressure measurement control Apparent inaccurate pressure measurement control Will not vent Will not vent An unplanned head correction is active or head height or gas is incorrect Incorrect pressure units and or measurement mode gauge or absolute Reference pressure transducer calibration coefficients have been altered AutoZ has been run and turned ON with an incorrect standard for zero System is vented but does not indicate zero because measurement mode is absolute Will not vent VENT port is plugged Open VENT port to atmosphere Exhaust valve not operating Page 133 Remove or change head correction 3 2 7 Set desired pressure units and or measurement mode Consider reference temperature if unit is inWa 3 2 2 Check and correct calibration
54. 88 Example Sent RETURN classic Reply 1000 000 kPaa Errors ERR 6 The current target pressure is invalid See Also 3 2 3 3 2 10 PS TP RS Purpose Adjust pressure at a fixed rate Command RS RateReq Classic RS RateReq Arguments RateReq The rate for the PPCK to generate to Negative rates cause the pressure to decrease and positive rate cause the pressure to increase Remarks The requested rate is an approximation and the PPCK will set and maintain a rate near to the requested rate to be the best of its ability Actual rates that can be set depend on the volume of the device under test The PPCK will continue to maintain the rate given until the ABORT command or ESCAPE key is used to cancel the operation or the UL pressure is reached Example Cmd sent RS 10 enhanced Query reply 10 kPa s Example Sent RS 10 classic Reply 10 00 kPa s See Also ABORT RATES IF DF IS DS UL Page 97 2001 DH Instruments Inc PPCK Operation and Maintenance Manual SCRSAV Purpose Read or set the front panel screen saver period Command SCRSAV n Query SCRSAV Classic SCRSAV n SCRSAV Arguments n The inactivity period minutes Default SCRSAV 10 Remarks The PPCK front
55. ATION To access the port configurations and remote program command mode select SPECIAL lt 4Internal gt lt 3Remote gt Select lt COM1 gt lt COM2 gt or lt IEEE gt to view and edit that port s settings Select lt format gt to select the remote programming command format to use see FORMAT of this Section COM1 And COM2 The COMx ports can be set for the specific settings required by the user These settings are baud parity length and stop bit The available options are Baud 300 600 1 200 2 400 4 800 9 600 Parity NONE ODD or EVEN Length 7or8 Stop Bit 1or2 The default is lt 2400 E 7 1 gt for COM1 and COM2 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 PPCK The PPCK 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 other options Page 59 2001 DH Instruments Inc 2001 DH Instruments Inc PPCK Operation and Maintenance Manual IEEE 488 The IEEE 488 port s primary address can be set from 1 to 31 in this screen The factory default value is 10 Secondary addressing is not used or supported This address must not conflict with the address of any other devices on the same IEEE 488 bus
56. CE device Data is transmitted out of the unit using pin 2 and is received on pin 3 This allows a normal pin to pin DB 9M to DB 9F RS232 cable to be used to connect to a DTE host Handshaking is not required or supported The COM receive buffer is 80 bytes deep If you overflow the buffer by sending too much data the data will be lost Because of this you must send a single program message at a time and you must wait for the PPCK to reply from the previous command before issuing another command Page 69 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual Table 10 Pin Designations and Connections PINE FUNCTION D sen IBM PC XT DB 9M TO PPCK DB9F IBM PC XT DB 9F CONNECTIONS CONNECTION E per Ga SE 4212 IEEE 488 The PPCK 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 Sid 488 2 1992 You should not attempt to communicate with the IEEE 488 interface while using the COM1 interface The IEEE 488 receive buffer is 250 bytes deep If you attempt to overflow the buffer the PPCK will hold off release of the NRFD handshake line until it can service and empty the receive buffer This keeps the buffer from overflowing 4213 CON The PPCK COM2 RS232 interface is located on the back of the unit It can be used to allow the Host computer to communicate with another device through the PPCK This allows
57. CK A10000 0 to 200 cc 50 cc optimal Note Pressure control system will operate in larger volumes but pressure setting times are increased A Gas is a compressible fluid The larger the pressurized the volume the larger the stored energy The size of high pressure volumes should be minimized for safety Slew Rate 0 to Controller FS in Optimal Volume with No Control 60 to 120 seconds Pressure Setting Typical Time To Ready Indication for a 10 Increment in Dynamic Mode 90 seconds reduced by increasing hold limit Gauge Mode 0 vented Absolute Mode Atmospheric pressure vented No limit greater than atmosphere 90 day 1 year Gauge Mode 0 016 0 018 Absolute Mode w Autozero 0 016 0 018 Absolute Mode w out Autozero 0 018 0 022 1 Control Precision Minimum useable hold limit in dynamic control mode 2 Delivered Pressure Uncertainty Maximum deviation from the true value of pressure applied to the device under test in dynamic control mode with default control limits and assuming measurement uncertainty as in Section 1 2 2 1 In static control mode the control error can be eliminated making delivered pressure uncertainty equal to measurement uncertainty 2001 DH Instruments Inc Page 4 PPCK Operation and Maintenance Manual DHI Table 2 Default Pressure Control Parameters DYNAMIC CONTROL MODE STATIC CONTROL MODE HOLD LIMIT STABILITY LIMIT HOLD LIMIT STABILITY LIMIT 0 01
58. Control Mode When dynamic pressure control mode is active a Ready condition occurs whenever e The current measured pressure is inside the hold limit Hold Limit Not Ready l Ready 7 Time Pressure out of l Pressure inside of hold limit hold limit l Figure 9 Ready Not Ready in Dynamic Control Mode 2001 DH Instruments Inc Page 26 PPCK Operation and Maintenance Manual DHI Ready Not Ready When Pressure Control Is Not Active When automated pressure control is NOT active Ready is indicated whenever the rate of change of pressure is less than the current stability limit 3126 MULTIPLE PRESSURE RANGES PPCK has one reference pressure transducer RPT which has three ranges The multi ranging feature allows measurement uncertainty to be optimized for the range of pressure in which you are working Generally the best range to select see Section 3 2 1 is that whose full scale is closest to but greater than the maximum pressure of the device or system under test Ranges available can be viewed at any time but a range change can only be executed when PPCK is vented see Section 3 1 2 2 When a range is changed the upper limit UL is automatically changed to the default for that range or to the last upper limit that was set for that range see Section 3 2 4 In addition most other functions and settings are range specific see Section 3 2 1 1 Each PPCK has three ranges In general user settings and ope
59. DHI 3445 RESET O PURPOSE To reset various PPCK settings to default or factory values PPCK stores its user definable settings in non volatile memory The reset menu allows the user to selectively or completely reset these settings to factory defaults This clears out any settings that the user has set up and should be used only to restore the PPCK to a known state PPCK will go through its reboot sequence after any type of reset is executed PPCK reset functions change current settings to factory defaults These may include settings vital to PPCK operation and affecting the calibration of the reference pressure transducer Reset functions should be used only by qualified personnel with knowledge of reset consequences Reset functions should never be used experimentally O OPERATION To access the reset function press EE SPECIAL and select lt 4Internal gt E lt 5Reset gt The display is 4cal Dall Reset Sets O PURPOSE Sets most general system operating parameters back to default values Does not affect calibration coefficients or remote interfaces e Returns each range unit of measure to the first of six available under UNIT see Section 3 2 2 e Returns measurement mode to the absolute see Section 3 2 2 e Range to H3 see Section 3 2 1 e Head settings to 0 cm and Nitrogen see Section 3 2 7 e Automated pressure control parameters to defaults see Section 3 2 3 1 e Al upper limit values to defau
60. FICATION 241 j SWTCHPOWERON Actuate the power switch on the PPCK rear panel Observe the front panel display as PPCK initializes error checks and goes to the main run screen see Section 3 1 1 PPCK operating condition at power up is all valves closed Powering down PPCK also causes all valves to close If the PPCK fails to reach the main run screen service is required Record the sequence of operation and displays observed and contact a DHI Authorized Service Provider see Table 22 The pressure range that was active on power down is active on power up 24 2 CHECK PROPER PRESSURE MEASUREMENT OPERATION 24 2 1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT Check that the PPCK operates properly in absolute mode If the PPCK is not vented press the VENT manual pressure control key to vent the PPCK VENT LED ON see Section 3 1 2 2 Open the TEST port as well to be sure the RPT is exposed to atmospheric pressure Press the UNIT function key and select lt absolute gt measurement mode see Section 3 2 2 Change the pressure unit if desired see Section 3 2 2 Observe the current value of atmospheric pressure displayed on the PPCK main run screen see Section 3 1 1 Check that the value agrees with the local value of atmospheric pressure within measurement tolerances Repeat this process for all three PPCK ranges Check that the values of atmospheric pressure measured by the different ranges agree with each other wit
61. FS of active 0 005 FS sec of 1 FS of active 0 005 FS sec of pressure range active pressure range pressure range active pressure range used only when control is not active Page 5 2001 DH Instruments Inc PPCK Operation and Maintenance Manual NOTES 2001 DH Instruments Inc Page 6 PPCK Operation and Maintenance Manual 2 INSTALLATION 2 1 UNPACKING AND INSPECTION 211 REMOVING FROMPACKAGING PPCK is delivered in a corrugated container with high density polyethylene inserts to hold it in place or in the optional molded medium density polyethylene shipping case with a custom foam insert Remove the PPCK and its accessories from the shipping container and remove each element from its protective plastic bag 212 INSPECTING CONTENTS Check that all items are present and have NO visible damage A standard PPCK includes all items indicated in Table 3 Table 3 PPCK Packing List DESCRIPTION PART NO PPCK Pressure Controller Calibrator FAMO0006 01 PPCK A3000 PPCK A6000 PPCK A10000 General Accessories Disk Important Includes system support software and documentation Page 7 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 2 2 SITE REQUIREMENTS The PPCK 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 slightly for easier viewing The PPCK can also be mounted in
62. LD LIMIT STABILITY LIMIT HOLD LIMIT STABILITY LIMIT 0 01 FS of active 0 005 FS sec of active 1 FS of active 0 005 FS sec of pressure range pressure range pressure range active pressure range 2001 DH Instruments Inc Page 36 PPCK Operation and Maintenance Manual O OPERATION To set custom control parameters press the CUSTOM CONTROL key from the main run screen The display is Sei Hold limit H3 0 30 psi D st oo Current reference transducer lt H gt for high and range lt 1 gt lt 2 gt or lt 3 gt Current control mode setting for this range lt S gt for static lt D gt for dynamic Entry field for setting the desired hold limit Recalls the default hold limit or the last custom hold limit set for the currently active range Enter the desired hold limit The next display is S Stability limit H3 0 30 psi D e A Dr Enter the desired stability limit custom control parameters active Current reference transducer lt H gt for high lt L gt for Lo and range lt 1 gt lt 2 gt or lt 3 gt Current control mode lt S gt for static lt D gt for dynamic Entry field for setting the desired stability limit Recalls the default stability limit or the last custom stability limit for the currently active range The display returns to the main run screen with the w i To reset default control parameters for a range and control mode select the contro
63. MSGFMT Arguments n 1 to use the enhanced command format 0 to use the classic command format Defaults MSGFMT 0 Remarks The user can select the type of remote command format to use This format must agree with the format sent to the PPCK 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 argumeni s See Also 4 3 Page 87 2001 DH Instruments Inc PPCK Operation and Maintenance Manual PASSTHRU Purpose To allow the host PC to communicate with a device connected to the PPCK COM2 port Command PASSTHRU n Query PASSTHRU Classic PASSTHRU n PASSTHRU Arguments n The string to send out of the COM2 port It must be less than 40 characters long Remarks This program message is a replacement for the program message which is obsolete The PPCK COM2 port can be used to communicate to another RS232 device such as another PPCK This allows the user to use one COM port or IEEE 488 port on the host computer to communicate with the PPCK and another device The command format specifies and sends the argument A carriage return and a line feed lt CR gt lt LF gt are added to the string that is sent The Query format is used to check the PPC2 COM2 receive buffer to see if a message has been received on COM2 from the d
64. N Select a pressure range using the RANGE key see Section 3 2 1 Press the CONTROL function key and select lt dynamic gt see Section 3 2 3 Press ENTER Specify a target pressure within the active range and press ENTER again see Section 3 2 3 PPCK should set the target pressure and indicate Ready see Section 3 1 2 5 continuously within 45 to 150 seconds If it does not see Section 6 to troubleshoot pressure control Remember that the correct pressure supplies must be connected to the SUPPLY pressure DRIVE IN pressure ports for pressure control to operate properly see Sections 2 3 6 3 1 2 3 Before setting a pressure with PPCK assure that the test system connected to the PPCK TEST port is rated for the pressure that will be generated SHORT TERM STORAGE The following is recommended for short term storage of PPCK Kl 4 Vent the PPCK Turn power OFF using the rear panel power switch Shut OFF or disconnect the pressure supply Shut OFF or disconnect the drive air supply Page 15 2001 DH Instruments Inc PPCK Operation and Maintenance Manual NOTES 2001 DH Instruments Inc Page 16 PPCK Operation and Maintenance Manual 3 OPERATION 3 1 GENERAL MANUAL OPERATION PPCK is designed to balance simple intuitive operation and the availability of a wide variety of functions with a high level of operator discretion The local operator interface is through a 2 x 20 display 4 x 4 k
65. PCK s COM1 port is connected to the PPCK COM2 port This example gets the version of the second PPCK See Also PASSTHRU COM2 ABORT Purpose Stops an active pressure generation All control valves are closed Command ABORT Classic ABORT Remarks This program message has no effect if the PPCK is not using automated pressure control When using automated pressure control it will abort the control Example Cmd sent ABORT enhanced Reply ABORT no reply if IEEE 488 Example Sent ABORT classic Reply ABORT See Also 3 2 3 3 1 2 3 3 1 2 4 Page 77 2001 DH Instruments Inc PPCK Operation and Maintenance Manual ATM Purpose Reads the next measured internal ambient pressure Query ATM Classic ATM Remarks The atmospheric pressure as measured by the PPCK on board barometer will be returned in the current pressure units always absolute This measurement is followed by the units text Example Query sent ATM enhanced Query reply 97 123 kPaa Example Sent ATM classic Reply 97 123 kPaa See Also 3 4 4 7 AUTOZERO Purpose Read or set the status of the automatic zero function Command AUTOZERO_ n Query AUTOZERO Classic AUTOZERO n AUTOZERO Default AUTOZERO 1 Arguments n 0 Autozero OFF 1 Autozero ON Remarks The
66. PPCK High Pressure Controller Calibrator Operation and Maintenance Manual 2001 DH Instruments Inc PPCK Operation and Maintenance Manual High pressure liquids and gases are potentially hazardous Energy stored in these liquids and gases can be released unexpectedly and with extreme force High pressure systems should be assembled and operated only by personnel who have been instructed in proper safety practices 2000 2001 DH Instruments Inc All rights reserved Information in this document is subject to change without notice No part of this document may be reproduced or transmitted in any form or by any means electronic or mechanical for any purpose without the express written permission of DH Instruments Inc 4765 E Beautiful Lane Phoenix AZ 85044 5318 USA DH Instruments makes sincere efforts to ensure accuracy and quality of its published materials however no warranty expressed or implied is provided DH Instruments disclaims any responsibility or liability for any direct or indirect damages resulting from the use of the information in this manual or products described in it Mention of any product does not constitute an endorsement by DH Instruments of that product This manual was originally composed in English and was subsequently translated into other languages The fidelity of the translation cannot be guaranteed In case of conflict between the English version and other language versions the English version p
67. PPCK Operation and Maintenance Manual Table 20 and Figure 13 should be used as reference when building a cable to utilize the drivers port Table 20 External Drivers en DEScRIPTON _ _ _ i e D2 Driver 2 Open Collector e Ds Driver a Open Collector D5 Driver 5 Open Collector JL De Driver 6 Open Collector K D7 Driver 7 Open Collector L D8 Driver 8 Open Collector Ce meom o mesem TF Drivers tay C a Drivers tav s dir ch Im kal Figure 13 Driver Cable Schematic 2001 DH Instruments Inc Page 136 PPCK Operation and Maintenance Manual DHI 7 2 UNIT CONVERSION 7 21 PRESSURE PPCK 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 21 provides the conversion coefficients used by PPCK to convert numerical values expressed in SI units to corresponding values expressed in other units Table 21 Conversion Coefficients Ppa Pol EI 1019716 E 7 50063 E 03 1450377 E04 1 007206 E06 4 014649 E03 4 021732 ER 4 018429 ER Page 137 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 7 3 GLOSSARY Absolute Mode Measurement mode in which the RPT indicates absolute pressure difference from vacuum The on board barometer reading ATMOFFSET The difference bet
68. PT and range number when used in gauge lt g gt or absolute lt a gt mode Units of measure the units of measure currently active for this range Pressing the key or pressing the RANGE key again causes the screen to step through the other available ranges in sequence Lo to Hi and back to Lo For example Tal Select Hi Rngl H1 psi 2000g 2000a Pons Identifies RPT lt Hi gt Identifies range of the RPT lt 1 gt lt 2 gt or lt 3 gt Range designator Full scale pressure value in the active units of measure for the RPT and range number when used in gauge lt g gt or absolute lt a gt mode Units of measure the units of measure currently active for the range sl range full scale limits are given in the pressure unit that is currently active for that range Use UNIT to change pressure units if desired see Section 3 2 1 weil The active range can only be changed when the system is vented If ENTER is pressed while in the RANGE function when PPCK is NOT vented the display indicates lt Vent system fully to change range gt Pressing the VENT key causes PPCK to vent and return to the RANGE function when the VENT is complete 3211 RANGE SPECIFIC FUNCTIONS AND SETTINGS PPCK functions and settings are range specific They are set and stored for each range so that changing them when in one range does not change them in the other ranges When you return to a range you will find the settings you lef
69. Page v 2001 DH Instruments Inc PPCK Operation and Maintenance Manual ABOUT THIS MANUAL Manual Conventions This manual is intended to provide the user with the basic information necessary to operate a PPCK pressure controller calibrator It also includes a great deal of additional information provided to allow you to optimize its use and take full advantage of its many features and functions Before using the manual take a moment to familiarize yourself with the table of contents structure Sections 1 2 and 3 should be read by all first time PPCK 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 PPCK operating principles Section 4 is for remote operation from an external computer Section 5 provides maintenance and calibration information Section 6 is a quick troubleshooting guide Use it to troubleshoot unexpected PPCK behavior based on the symptom of that behavior w i For those of you who don t read manuals go directly to Section 2 3 to set up your PPCK and then Section 2 4 for power up and verification This will get you running quickly with a minimal risk of causing damage to yourself or your new PPCK THEN when you have questions or start to wonder about all the great features you might be missing get into the manual Certain words and expressions have specific meaning as they pertain to PPCK The Gl
70. Read or set the autozero natural error ZNATERR for the selected RPT range and measurement mode PPCK has only a Hi RPT Command ZNATERRn HI NatErr Date Query ZNATERRn HI Classic ZNATERRn HI NatErr Date ZNATERRn HI Defaults ZNATERRn HI 0 0 800101 Arguments n The RPT range 1 for the low 2 for the medium 3 for the high range of the selected RPT NatErr The RPT natural error for the RPT range Date The date when the last edit to the NatErr was made Remarks The natural error ZNATERR for the specified RPT always Hi RPT in PPCK and RPT range 1 2 or 3 can be accessed with this program message Using this program message will overwrite the current natural error so caution must be used Changes made using this program message will take effect immediately Example Cmd sent ZNATERR1 HI 10 961201 enhanced Query reply 10 00 Paa 961201 Example Sent ZNATERR1 HI 10 961201 classic Reply 10 00 Paa 961201 Errors ERR 6 One of the arguments are out of range See Also 3 4 1 5 2 6 4 5 STATUS REPORTING SYSTEM The PPCK 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 PPCK can be programmed to respond to various status conditions by asserting the SRQ of the IEEE 488 interface The COM
71. Status Register o o Page 111 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 461 PROGRAMMESSAGE DESCRIPTIONS CLS Purpose Clear all of the status amp event structures Command CLS Remarks This program message clears the following events and status registers Standard Byte Register STB Standard Event Status Register ESR Error Queue Pending OPC operations Example Sent CLS classic Reply none ESE Purpose Read or set the Standard Event Status Enable Register Command ESE n Query K ESE Default ESE 0 Arguments n O to 255 This is the decimal representation of the bit s to enable To enable the PON and QYE bits the argument would be 128 4 132 Remarks The Standard Event Status Enable register determines which bits in the standard Event Status Register are enabled and included in the Status Byte Register ESB bit and can assert the SRQ line The reply is in decimal numeric form Example Sent xESE 128 enables the PON bit enhanced Query reply 128 no reply if IEEE 488 Errors ERR 6 nis not valid ESR Purpose Read the Standard Event Register Command ESR Remarks The Standard Event Register contents are cleared after reading The reply is in decimal numeric form Example Sent xESR enhanced Re
72. T updated at least every 30 days or when PPCK has been exposed to temperature changes exceeding 20 C 36 F O PRINCIPLE How AutoZ Works The main component of the change over time of the PPCK RPTs is zero drift or offset independent of span Rezeroing PPCK RPTs relative to a more stable reference between recalibrations allows lower measurement uncertainty specifications to be maintained with less frequent full calibrations The PPCK autozero function AutoZ provides full on board support for the rezeroing process to simplify its application by the user Page 47 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual The autozeroing function uses four parameters 1 ZSTD The value of the autozero reference pressure as indicated by the reference autozero device In absolute measurement mode the autozero pressure is usually a pressure value near atmospheric pressure and the ZSTD value can be supplied either a by manual entry b automatically from a DHI RPM connected to the PPCK COM2 port In gauge measurement mode the autozero pressure is always zero atmospheric pressure which is supplied by definition when the RPT is vented to atmosphere 2 ZCURERR The difference between ZSTD and the RPT indication at the autozero pressure at some time after the calibration of the RPT ZCURERR RPT w out ZOFFSET ZSTD 3 ZNATERR The difference between ZSTD and the RPT indication at the autozero pressu
73. The MSS and MAV bits are set RSE Purpose Read or set the Ready Status Enable Register Command RSE o Query RSE Default RSE 0 Arguments n O to 255 This is the decimal representation of the bit s to enable To enable the RDY bit the argument would be 1 Remarks The Ready Status Enable Register determines which bits in the Ready Status Register are enabled and included in the Status Byte Register RSR bit and can assert the SRQ line The reply is in decimal numeric form Example Sent xRSE 1 enables the RDY bit enhanced Query reply 1 no reply if IEEE 488 Errors ERR 6 nis not valid RSR Purpose 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 2001 DH Instruments Inc Page 114 PPCK Operation and Maintenance Manual 5 MAINTENANCE ADJUSTMENTS AND CALIBRATION 5 1 OVERVIEW PPCK was designed for maintenance free operation No maintenance is required other than e Rezeroing of reference transducer RPT as needed see Section 3 4 1 e Regular RPT recalibration see Section 5 2 e Adjustment of the on board barometer as needed see Section 5 3 e Purging of the DRAIN port see Section 5 4 This section provides information on maintenance adjustment and calibration proce
74. The receiving terminating character must be a line feed and EOI Carriage returns are ignored if received The PPCK sends a line feed and asserts the EOI line to terminate a reply These settings are fixed to agree with IEEE Std 488 If you change the address the IEEE interface will reset PON and become idle Format The PPCK has two different syntax formats available for the remote program commands The classic format is compatible with previous PPC products and is the default format The enhanced format follows the syntax format and status reporting features of IEEE Std 488 2 The details of each are covered in Section 4 3 Selecting a format resets the IEEE interface and puts it into an idle state TIVE PURPOSE To view and edit the PPCK internal time and date settings OPERATION To access the time function press raat ltime 2date SPECIAL and select lt 4lnternal gt 08 32 11 am 20000115 lt 4Time gt The display is Select lt 1time gt to edit the time Edit hours then minutes then am pm by pressing ENTER at each entry Seconds go to zero when minutes are entered Select lt 2date gt to edit the date The date must be specified in YYYYMMDD format E The PPCK date and time are set to United States Mountain Standard Time in the final test and inspection process at the factory If desired use the date function to set your local time and date Page 60 PPCK Operation and Maintenance Manual
75. The screen saver time can be changed or screen saving can be completely suppressed see Section 3 4 4 8 3 12 GENERAL OPERATING PRINCIPLES 3121 KEYPAD LAYOUT AND PROTOCOL The PPCK has a 4 x 4 keypad for local operator access to direct functions function menus and for data entry 1 The Function Data keys allow very commonly used functions to be accessed directly by a single keystroke when pressed from the main run screen The name of the function is on the bottom half of the key see Sections 3 1 2 7 3 2 These keys enter numerical values when editing 2 The Editing and Execution keys are for causing execution suspending execution backing up in menus and editing entries 3 The Menu Data keys provide access to function menus when pressed from the main run screen The menu name is on the bottom half of the key The SETUP menu is for more frequently used functions see Section 3 3 The SPECIAL menu is for functions that are not generally used as a part of day to day operation see Section 3 4 These keys enter numerical values when editing Figure 3 Keypad Layout 2001 DH Instruments Inc Page 18 PPCK Operation and Maintenance Manual DHI e Pressing ENTER within a menu or function generally causes execution or forward movement in the menu tree Pressing ENTER from the main run screen allows an automated pressure control command to be given Pressing ESCAPE moves back in the menu tree and
76. YSTEM DEFAULT CONTROL PARAMETERS sssccssssseessssseeees 1 34 3 2 3 2 EXECUTING AUTOMATED PRESSURE CONTROL COMMANDS 24 3 2 4 UL UPPER UNI 24 3 2 4 1 OVERPRESSURE FUNCTION 35 3 2 5 SEQ SEOUENCE 28 3 2 6 CUSTOM CONTROL sssssssssssssssssssssssssssssssseesssssseessssssesssssseessessees 11 36 3 2 6 1 TURNING OFF CUSTOM CONTROL PARAMETERS ey Gg REI eege een 28 3 2 8 LEAK CHECK 29 3 2 9 RES RESOLUTION ssss ssses11sssesrneseenrnssernneeennneennnns A 3 2 10 SET P SETTING PRESSURE AUTOMATICALLY sssssssssssssssssssssesssssseesssese A3 3 2 10 1 AUTOMATED PRESSURE COMMANDS FOR ZERO PRESSURE A4 3311 lt AND gt JOG PRESSURE SET POINT E A8 3 3 SETUP MENU KEY EEN A 33417 SEQUENCE naii cacti ie Ee 46 S62 DRIVERS ffeil ice ee aes ea has eG SIN ree inde ee cds 46 3 4 SPECIAL MENU KEY 3 4 1 AUTOZ 47 3 4 1 1 VIEW AUTOZ 50 3 4 1 2 EDIT AUTOZ 51 3 4 1 3 RUN AUTOZ 51 242 HEAD vissscscccccsccsscccsincssscese 54 3 4 3 PresU ee DD 3 4 4 INTERNAL D I 3 4 4 1 CONFIG dent ASE ERSTA 3 4 4 2 CAL des Geck LE 3 4 4 3 REMOTE en eee Segel 3 4 4 4 TIME tas oe DD 3 4 4 5 RESET 61 3 4 4 6 LEVEL ez V S 3 4 4 7 ATM sagen bane weds EEE o c 3 4 4 8 SCRSAV bas gel BEE OL SE TS E OG vreveclccencssneweesneeeessuenesisncuvewerexe useey E 67 4 REMOTE OPERATION cccccccceeeeccceeeeeee
77. a standard 19 in rack mount using the optional rack mount kit Minimizing the length of tubing connecting the PPCK to the device or system to be tested enhances control performance and reduce pressure setting times Ready access to the PPCK rear panel should be considered to facilitate making and breaking pressure connections when necessary Support facilities required include e An electrical power source of 85 to 264 VAC 47 to 440 Hz e A continuous regulated high pressure supply of clean dry non corrosive gas at maximum PPCK range H3 5 to be connected to the SUPPLY port Supply pressures of less than range H3 5 may cause out of tolerance pressure control The SUPPLY source must remain stable 1 while PPCK is controlling If a gas booster is used to supply high pressure an accumulator is required to dampen the pressure changes caused by the booster cycling Consider using the DHI GB K gas booster package e A continuous regulated drive air pressure supply of clean dry non corrosive gas at 700 to 850 kPa 100 to 120 psig The drive air supply must remain stable 5 during PPCK operation This DRIVE pressure supplies the precision low pressure control system that actuates PPCK s high pressure valves The flow and consumption requirements are extremely low Use of instrument grade nitrogen or air from a compressed air bottle is recommended If shop or factory air is used a filter dryer must be installed The DHI GB K
78. ainty due to possible changes in atmospheric pressure limited to 2 5 Pa 0 00035 psi Recommendations For The Use Of The AutoZ Function The AutoZ function provides a powerful and easy to use tool for improving the measurement uncertainty specifications of a PPCK and reducing the calibration recall interval by compensating for zero drift between full recalibrations The following simple recommendations will help assure that you use this feature to best advantage e Always leave AutoZ ON when operating in the gauge measurement mode unless the on board barometer has malfunctioned see Section 3 4 4 7 e Always leave AutoZ ON when operating in the absolute measurement mode if ZNATERR was set properly at calibration and the AutoZ routine using a valid atmospheric reference has been run regularly e Execute the run AutoZ routine only when a reference whose measurement uncertainty is known to be significantly lower than that of the PPCK RPT is available Keep range ratios in mind when comparing uncertainties A 0 01 FS barometer has roughly 200 times lower measurement uncertainty than a 0 02 FS 2 000 psi 14 MPa PPCK range because the RPT barometer range ratio is 10 1 e The best day to day reference for running AutoZ in absolute mode is a properly calibrated barometric range DHI PPCK interfaced directly to the PPCK COM2 port The on board barometer can also be used as a stable atmospheric pressure reference e Allow the PPCK
79. an upper limit for the current RPT and range Command UL n Query UL Classic UL n UL Arguments n The upper limit pressure in the current pressure units This value is always in absolute units if the RPT is absolute or gauge units if the RPT is gauge Remarks The PPCK has an upper limit for each range of each RPT and for each measurement mode gauge and absolute New automated pressure control targets can not be greater that this value If the pressure does exceed the upper limit the pressure display will flash and the unit will stop generating Manual increases in pressure will not be allowed as long as the pressure is above the upper limit Decreases in pressure will be allowed This feature should always be used to prevent accidental over pressure of a device under test Example Cmd sent UL 1000 enhanced Query reply 1000 00 kPaa Example Sent UL 1000 classic Reply 1000 00 kPaa Errors ERR 6 The argument is out of range See Also 3 2 4 Page 103 2001 DH Instruments Inc PPCK Operation and Maintenance Manual UNIT Purpose Read or set the pressure display unit and measurement mode Command UNIT unit rer UNIT unitg ref UNIT unita ref Query UNIT Classic UNIT unit ref UNIT unitg ref UNIT unita ref UNIT Arguments unit The text correspondi
80. ange H3 of the PPCK model you are using Always use the correct fittings Take care NOT to connect the high pressure supply to a port other than the SUPPLY port CONNECTING THE HIGH PRESSURE SUPPLY TO ANY PORT OTHER THAN THE SUPPLY PORT MAY DAMAGE THE PPCK AND MAY CAUSE OPERATOR INJURY 235 CONNECTING TO THE DEVICE UNDER TEST TEST PORT The TEST port is for connection of the PPCK to the system into which it will measure and control high gas pressures Using a pressure connecting hose or hard tube of appropriate pressure rating connect the device or system to be tested to the TEST port The PPCK TEST connection is DH200 F DH200 F is a gland and collar type fitting for coned and left hand threaded 1 4 in 6 mm OD tube equivalent to AE SF250C HIP LF4 etc DO NOT USE INCORRECT FITTINGS DAMAGE TO THE FITTING AND DANGER TO THE OPERATOR COULD RESULT Gas is a compressible fluid The larger the pressurized volume the larger the stored energy The size of high pressure volumes should be minimized for safety A NEVER apply pressure to the TEST port greater than the PPCK maximum range H3 working pressure Internal damage to the PPCK may result E Operating the PPCK connected to a system with liquid contaminants without taking proper precautions to purge the system and test line may cause contamination of the PPCK that will affect measurement and control performance and require non warranty service Page 11 2001 DH Inst
81. ar aa aaa a aa aea a aan a idea deet ENEE 108 8 Bit Standard Event Register cecccccceeeeseeceeeeeecaeeeeeaeeeeeeeseaeeesaaeseeaaeseeeeeseaeeesaaeseeeeesaas 110 8 Bit Ready Status Register cccccceccccceeeeeeeeeeeeeeeceaeeeeeaeeeeeeeeceaeeecaaeeseaeeseneeeseaeeseeaeeeeeeesaas 111 Program Message Lisbetti ei ie aaa ee tl ae aed 111 Troubleshooting Guide A 129 Driver Output eege alive idea Aeiee tte ae aes eee ata Hd Ce ae Ee 135 External Drivers veg aie hk ea Aa a eR Ae ee cca ec ev eee 136 Conversion Coefficients A 137 DHI Authorized Service Providers 141 2001 DH Instruments Inc Page iv Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 PPCK Operation and Maintenance Manual FIGURES Front Paneli ccac EE 9 Rear Panel El EEN 10 Keypad Layout EE 18 Manual Pressure Control Keys 19 PNEUMATIC Schemat EE 21 Static Pressure Control Operation 23 Dynamic Pressure Control Operation ccccccceceeeseeceeeeeceaeeeeneeeeeeeeceaeeseaaeseeeeeseaeeesaeeeeaeeeeeas 24 Ready Not Ready in Static Control Mode ceccccceceeeeeeeeeeneeeceeeeeeaeeeeaeeseeeeeseaeeetaeeeeneeee 26 Ready Not Ready in Dynamic Control Mode sesseeeeseeseesrssiressirssrrssinssrrssrrssrnssrnesrrnsren 26 Status Register Schema 108 JOE MIEL ee poco s ce EE Ee 126 Pneumatic Module High and Low 127 Driver Cable Gchemaiic 136
82. auge Mode Measurement mode in which the RPT indicates gauge pressure difference from atmospheric pressure A difference in height between the PPCK reference level and the DUT Hold Limit An automated pressure control parameter Maximum acceptable difference between the current pressure and the target pressure value 2001 DH Instruments Inc Page 138 PPCK Operation and Maintenance Manual DHI Measurement Mode Whether pressure is being measured relative to absolute zero or vacuum absolute mode or relative to atmospheric pressure gauge mode Pressure adder used to offset an RPT range or barometer in calibration Pressure multiplier used to adjust span of an RPT range or barometer in calibration The rate of change of the current pressure Indicated in the main run screen when control is suspended Ready Not Ready Indication used in automated control to indicate when control is complete and data may be taken within control parameters Reference pressure monitor manufactured by DHI Models are RPM1 RPM2 RPM3 RPT Reference The transducer used by PPCK for high accuracy pressure measurement Pressure Transducer The RPT in a single RPT PPCK or the higher pressure range RPT in a dual RPT PPCK is referred to as the Hi or primary RPT The lower pressure range RPT in a dual RPT PPCKt is referred to as the Lo RPT RPTs are designated by a leading A or G absolute or gauge followed by four numbers indicating the ma
83. ay be useful to keep a copy of this summary near the PPCK especially when first becoming acquainted with its operation 3 2 DIRECT FUNCTION KEYS 321 Q PURPOSE To view and or change the pressure measurement range PRINCIPLE Each PPCK has three ranges see Section 3 1 2 6 Pressing the RANGE function key allows the ranges to be viewed and selected PPCK functions and settings such as pressure unit of measure control mode and upper limit are range specific Changes made while in one range apply to that range only and do not affect settings in other ranges Only the HEAD function is not range specific see Section 3 2 7 OPERATION Pressing the RANGE function key activates the range viewing and selecting function Pressing the key or the RANGE key again while in the RANGE functions steps through displays of available ranges Lo to Hi Pressing ENTER while in the RANGE viewing function if the PPCK is vented causes the currently displayed range to become the active range Pressing ESCAPE while in the range function returns to the main run screen with no range 2001 DH Instruments Inc Page 28 PPCK Operation and Maintenance Manual DHI Table 6 Summary of PPCK Direct Function Key Operation Direct Function Keys are active from the MAIN run screen See corresponding manual sections for full detail MENU OF COMMONLY USED SETUP FEATURES INCLUDING Menu of less frequently used internal functions and setti
84. be preceded by at least one white space from the program message header and be within the range and format described in the program message description The keyword Command will appear to the left of the required syntax in each program message description If you are using the IEEE 488 port the Command type does not generate a reply so you do not need to wait fora reply You also may send multiple program messages at once by separating each program message with a semicolon The commands will be queued and executed in as received order If you are using the RS232 port COM1 the Command type will always generate a reply so you must wait for a reply before issuing another program message Because of this you can only send one Command program message at a time while using the COM1 port 43 22 ENHANCEDPROGRAMIMESSAGE USING THE QUERY TYPE The Query type of program message just requests data from the PPCK You must wait for a reply with a query If you send any type of program message to the PPCK 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 488 2 status reporting model A Query program message always ends with a question mark Most queries will return a reply within 200 ms except PR PRR SR ATM RATE Up to 2 0 seconds to allow a new measurement The syntax for using a QUERY program message is listed next to the keyword Que
85. bsolute measurement to arrive at a gauge value The appropriate tare value changes with the natural evolution of atmospheric pressure at a given location For this reason the value of the tare is redetermined each time the RPT is known to be exposed to atmospheric pressure e g the PPCK is vented and the pressure is stable However if atmospheric pressure changes significantly between opportunities to redetermine the tare for example if running an extensive test that does not include returns to a vented condition the changes in atmospheric pressure during that time will not be taken into account and a significant zero offset in the gauge pressure indications could result To minimize zero errors due to the evolution of atmospheric pressure between taring opportunities when using an absolute RPT in gauge measurement mode PPCK dynamically compensates the atmospheric tare value PPCK s on board barometer measures atmospheric pressure independently from the RPT Between opportunities to update the tare value vented conditions the difference between the on board barometer reading at the time of the last tare value and the current on board barometer reading is used to compensate the tare value This value is called ATMOFFSET This technique which relies only on the resolution and short term stability of the on board barometer rather than its absolute measurement uncertainty allows gauge measurements with an absolute RPT with an additional uncert
86. d Will not set pressure Will not set pressure Will not set pressure Disagreement between transducer ranges appears excessive 2001 DH Instruments Inc Encountered unresolved internal software conflict The CUSTOM CONTROL function has been used Current upper limit of active range has been exceeded PPCK has been overpressured pressure higher than UL Control parameter settings are too tight and or existing conditions will not allow Ready to be achieved Pressure supply ies incorrectly connected or not adequate Valve drive air supply is not connected or too low so high pressure valves are not opening There is a very large leak in the test system or TEST port is not connected Difference is actually in tolerance and represents natural disagreement Page 130 Cycle power to clear Please record conditions leading up to event including the numbers displayed when ENTER is pressed and report to your DHI Authorized Service Provider Table 22 Reset control parameters to default by selecting a control mode using CONTROL function 3 2 3 Correct overpressure condition Change UL and or active range if needed 3 2 4 3 2 1 Correct the overpressure condition and cycle power ON and OFF 3 2 4 3 2 4 1 Adjust control parameters or correct other conditions 3 1 2 5 3 2 6 Correct pressure supply ies 2 3 4 Connect valve drive air correctly and or increase drive
87. d Maintenance Manual DHI e 444 PROGRAMIMESSAGE DESCRIPTIONS Purpose To allow the host PC to communicate with a device connected to the PPCK COM2 port This program message is obsolete You should instead use the PASSTHRU program message This command is not available when using the enhanced command format Instead use the PASSTHRU command Classic HXX Arguments XX The string to send out of the COM2 port It must be less than 40 characters long Remarks The PPCK COM2 port can be used to communicate to another RS232 device such as another PPCK This allows the user to use one COM port or IEEE 488 port on the host computer to communicate with the PPCK and another device A carriage return and a line feed lt CR gt lt LF gt are added to the string After this program message is issued the PPCK will reply back the first string received by the PPCK COM2 port that is terminated with a carriage return Line feeds are discarded This will discontinue when the next program message is sent to the PPCK There is no other reply from this program message Prior to using this program message you must ensure that the PPCK COM2 port is correctly set up to communicate with the device on COM2 Refer to the COM2 program message Example Sent VER classic Reply DH INSTRUMENTS INC PPCK us A1000 A0015 Ver1 00 This example assumes that a second P
88. d for ZNATERR the value used to autozero the RPT range ZSTD The value indicated by the device used as the reference in determining ZNATERR and ZCURERR 7 4 WARRANTY STATEMENT Except to the extent limited or otherwise provided herein DH Instruments Inc DHI warrants for one year from purchase each new product sold by it or one of its authorized distributors only against defects in workmanship and or materials under normal service and use Products which have been changed or altered in any manner from their original design or which are improperly or defectively installed serviced or used are not covered by this warranty DHI and any of its Authorized Service Providers obligations with respect to this warranty are limited to the repair or replacement of defective products after their inspection and verification of such defects All products to be considered for repair or replacement are to be returned to DHI or its Authorized Service Provider freight prepaid after receiving authorization from DHI or its Authorized Service Provider The buyer assumes all liability vis a vis third parties in respect of its acts or omissions involving use of the products In no event shall DHI 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 loss of production profits revenue or goodwill even if DHI has been advised
89. d limit These keys also jog the target value when in the SET P screen see Section 3 2 11 32101 AUTOMATED PRESSURE COMMANDS FOR ZERO PRESSURE 2001 DH Instruments Inc Zero in A command for automated pressure control to a target value of gauge mode zero when in gauge pressure measurement mode is interpreted in the same manner as if the VENT manual pressure control key had been pressed see Section 3 1 2 2 A Ready condition occurs when the vent valve has been opened and the pressure meets the current stability test Zero in Since PPCK has no provision for setting pressure lower than absolute atmosphere a command for automated pressure control to a mode target value of zero when absolute pressure measurement mode is interpreted in the same way as a command for zero in gauge measurement mode PPCK executes the VENT function see Section 3 1 2 2 and a Ready condition occurs when the vent valve has been opened and the pressure meets the current stability test The vented condition atmospheric pressure is the lowest pressure that PPCK can set Due to the manner in which PPCK handles an automated pressure command for zero in absolute pressure measurement mode a Ready condition will occur at an atmospheric pressure not zero When setting zero in absolute measurement mode the Ready condition should not be interpreted to mean that the pressure is zero within the hold limit Ready is an indication that the PPCK TEST port is o
90. d the barometer board see Section 5 6 5 It also supplies power to the cooling fan Page 127 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 564 POVER SUPPLIES e 12 V DC 2 3 3 Amps For internal and external valve actuation thermal pressure control unit TPCU e 5VDC 41 3 0 Amps 15VDC 3 2 0 Amps 15 V DC 43 0 35 Amps For the supply of the micro board and driver board electronics 565 ONBOARD BAROMETER The barometer board supports a barometric range micromachined silicon sensor an ambient temperature sensor and associated electronics The barometer readings are used for dynamic atmospheric pressure compensation when measuring gauge pressure with an absolute reference transducer see Section 3 4 1 The temperature sensor is used for temperature compensation of the barometric sensor The barometer board includes a memory in which its specific calibration coefficients are stored 566 MCROCARD The micro card supports a Motorola 68302 microcontroller EPROM EEPROM NVRAM and flash memories RS232 communications IEEE 488 communications the front panel keypad and display control and a two channel frequency counter for reading the reference pressure transducers An UO port controls other boards and devices in PPCK 567 THERMAL PRESSURE CONTROL UNIT TPCU The PPCK thermal pressure control unit is used for fine pressure control in dynamic control mode see Section 3 1 2
91. dicates that the PPCK was set to local operation manually from the front panel by the user pressing the ESC key e Command Error Bit 5 Indicates that a remote command error has occurred A command error is typically a syntax error in the use of a correct program message e EXE Execution Error Bit 4 Indicates if a remote program message cannot be processed due to device related condition e DDE Device Dependent Error Bit 3 Indicates that an internal error has occurred in the PPCK such as a transducer time out e QYE Query Error Bit 2 Indicates that an error has occurred in the protocol for program message communications This is typically caused by a program message being sent to the PPCK without reading a waiting reply e RQC Request Control Bit 1 This bit is not supported as the PPCK cannot become the active controller in charge e OPC Operation Complete Bit 0 Indicates that the PPCK has completed all requested functions 2001 DH Instruments Inc Page 110 PPCK Operation and Maintenance Manual DHI 454 READY STATUS REGISTER The PPCK contains an 8 bit Ready Status Register that reflects specific PPCK measurement and generation ready events Enabled events in this register will set or clear the RSB bit of the Status Byte Register Table 16 8 Bit Ready Status Register 128 64 32 16 8 4 2 1 This register can be read using the RSR query Each of these status bits can set
92. dures certain repair functions and recommended overhaul procedures A Pecks is a sophisticated pressure setting and measuring instrument with advanced on board features and functions Before assuming that unexpected behavior is caused by system defect or breakdown use this manual and other training facilities to become thoroughly familiar with PPCK operation For rapid assistance in specific situations see Section 6 w i PPCK is covered by a limited one 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 115 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 5 2 CALIBRATION OF REFERENCE PRESSURE TRANSDUCERS 521 PRINCIPLE PPCK has reference pressure transducers RPT that is the source of precise pressure measurement for the system The RPT has three independent ranges To calibrate a range pressures from a standard are applied to the RPT at ascending and descending points over the range The pressure defined by the standard and the corresponding RPT readings are recorded at each point After all of the pressures have been applied and recorded adjustments are made to fit the RPT pressure readings to the standard Fitting the readings means performing a linear regression to arrive at the lowest value of the residuals of errors of the transducer relative to the s
93. dy condition when setting a pressure Poor pressure control characterized by excessively fast slew rate and overshooting Poor pressure control characterized by pauses at the start of a pressure setting sequence Poor pressure control characterized a pause of up to 45 seconds while controlling in dynamic control mode while lt CFGs is flashing a the valve control characters Apparent inaccurate pressure control measure and little or no response or nonsensical indication from reference pressure transducer 2001 DH Instruments Inc PPCK is contaminated with liquids Excessive leak present in system Test volume is too large Test volume too small Ten to fifteen seconds are required for the high pressure valve opening routine to execute During this time pressure does not change The control status characters display lt VLV gt flashing PPCK has determined that the test volume has changed and is running a new volume determination routine The routine takes 30 to 45 seconds to execute and should repeat only if the test volume is changed Reference transducer destroyed by overpressure Page 132 Purge PPCK from the drain Avoid sources of liquids in the future Contact Authorized Service Center if purging does not eliminate liquid 5 4 Table 22 Correct internal or external leak or increase hold limit Consider using static pressure control if you must work with large leaks present 3
94. e ZNATERR routine absolute mode calibration only see Section 5 2 6 Calculate as left data for the calibration if desired following as left reading non corrected reading new PM new PA Page 123 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 5 3 ADJ USTMENT OF ON BOARD BAROMETER O PURPOSE To adjust the output of the on board barometer see Section 1 2 2 2 O PRINCIPLE The on board barometer output can be adjusted using PA and PM values in the same manner as the reference pressure transducer see Section 5 2 1 F the on board barometer is a low accuracy sensor used only for measuring changes in atmospheric pressure over short periods of time see Section 3 4 1 It needs a traceable calibration only if it is to be used as the source of ZSTD for autozeroing the PPCK RPT in absolute measurement mode see Section 3 4 1 O OPERATION To edit the values of PA and PM for the barometer press SPECIAL and select lt 4Internal gt lt 2cal gt lt 2barometer gt Pressing ENTER steps through displays of the calibration date YYYYMMDD and PA and PM In edit mode the values can be edited Pressing ENTER after the last screen activates the edited values wi d view the current atmospheric pressure measurement made by the barometer board press SPECIAL and select lt 4Internal gt lt 7Atm gt 5 4 DRAIN PURGE O PURPOSE To purge any liquids that may have collected in the PPCK thermal
95. e indicates that the test volume has changed PPCK runs an automated routine to determine the new test volume This routine is initiated automatically when needed The execution of the volume determination routine may occur occasionally while TPC is active in dynamic control mode This normal behavior appears as a delay in pressure control during which the pressure may vary by up to 700 kPa 100 psi The volume determination configuration can also be launched by the user see Section 3 4 4 1 2001 DH Instruments Inc Page 20 PPCK Operation and Maintenance Manual DHI 1 SUPPLY Port DH200 F 11 High Pressure Exhaust Valve 2 HP Inlet Valve Dome Exhaust Valve 12 HP Exhaust Valve Dome Exhaust Valve 3 High Pressure Inlet Valve 13 VENT Port 1 8 in NPT F 4 HP Inlet Valve Dome Supply Valves 14 TEST Port DH200 F 5 Drive Air Lines 15 DRAIN Port DH200 F 6 DRIVE IN Port 1 8 in NPT F 16 Thermal Pressure Control Unit TPCU 7 Drive Air Filter 17 Reference Pressure Transducer RPT 8 Drive Air Regulator factory adj 18 High Pressure Filter s 9 DRIVE OUT Port 1 8 in NPT F 19 High Pressure Lines 10 HP Exhaust Valve Dome Exhaust Valves Figure 5 Pneumatic Schematic Page 21 2001 DH Instruments Inc H PPCK
96. e is a list of the possible errors numbers and the error description for each Table 13 Error s and Descriptions Missing or invalid command suffix or the pressure is not greater than 1 MPa or PPCK is busy Page 75 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 443 PROGRAMIMESSAGE DESCRIPTION O RVIEW Each program message description is separated into the following sections Purpose A brief description of the programs messages function Command This is the Enhanced program message syntax to send data to the PPCK or to execute a PPCK function The PPCK must be set to use the enhanced format see Section 4 3 It may be sent alone or followed by at least one white space and additional argument s to show that arguments can be passed If there are multiple arguments then commas must separate them If you are using the IEEE 488 port multiple Command type program messages can be sent in one message if you separate them with a semicolon There will be no reply from the PPCK using the IEEE 488 port If you are using the COM1 port the PPCK will reply and you must wait for this reply If this field is not listed in the program message description then the Command type is not supported when using the Enhanced format Query This is the Enhanced program message syntax to request data from the PPCK The PPCK must be set to use the enhanced format see Section 4 3 2 T
97. e measurement mode is unknown when a PPCK RPT is calibrated in gauge mode A PPCK calibrated in gauge mode should not be used to make accurate measurement in absolute mode e Able to apply pressures at 20 increments in the range to be calibrated It is not necessary that the calibration pressure standard used apply precisely the nominal pressure value requested for a calibration point as long as the exact value of the applied pressure is known Best results will be obtained if the pressure actually applied is within 2 of FS of the range being calibrated from the nominal increment For the zero point on absolute ranges use the lowest point the piston gauge can define accurately or atmospheric pressure if a barometer with appropriate measurement uncertainty is available el contact DHI for additional information on calibration standards available to calibrate PPCK Precision barometer Needed only if the PPCK RPT is to be calibrated in absolute mode for absolute operation The barometer is used to obtain absolute pressure by adding atmospheric pressure to gauge pressure defined by a piston gauge It is also used to set ZNATERR to allow the use of the autozero function between calibrations see Section 3 4 1 Barometer measurement uncertainty should be 350 Pa 0 05 psi or better wl recommended source for measuring atmospheric pressure to set ZNATERR and for subsequent autozeroing is a DHI RPM3 reference pressure monitor Contact DHI f
98. e other For example if you set 4 OOO psi as the upper limit in absolute mode the upper limit will not be 4 OOO psia atmospheric pressure in gauge mode The gauge mode upper limit for that range will still be the default limit or another limit that has been set in gauge mode w l Upper limits are always specified and displayed in the current pressure unit 3241 OVERPRESSURE FUNCTION 325 Q In addition to the UL function PPCK has an overpressure function This function executes when the maximum RPT range is exceeded by 25 The function causes all pressure control to be interrupted and disabled changes the range to H3 and causes the display to flash The overpressure function also logs the time and date of the overpressure condition to assist in incident diagnosis To recover from an overpressure condition cycle PPCK power SEQ SEQUENCE PURPOSE Not supported in PPCK Page 35 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 326 CUSTOMCONTROL O PURPOSE To customize the control parameters of the current pressure control mode for the current range wi See Sections 3 1 2 4 3 2 3 for information on setting pressures automatically O PRINCIPLE Automated pressure control and the associated pressure Ready Not Ready condition are characterized by hold limit and stability limit parameters which determine how PPCK controls and under what conditions a Ready indication will occur see Sectio
99. ed ESB Event Summary Bit Bit 5 Indicates if an enabled bit in the Standard Event Status Register became set see Section 4 5 3 MAV Message Available Bit Bit 4 Indicates that at least one reply message is waiting in the PPCK IEEE 488 output queue ERROR Error Queue not empty Bit 2 Indicates that at least one command error message is waiting in the PPCK IEEE 488 error message queue Use the ERR query to get this message RSB Ready Summary Bit Bit 0 Indicates that an enabled bit in the Ready Status Register became set Page 109 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 453 STANDARD EVENT REGISTER The PPCK contains an 8 bit Standard event register that reflects specific PPCK events Enabled events in this register will set or clear the ESB bit of the Status Byte Register Table 15 8 Bit Standard Event Register 128 64 32 16 8 4 2 1 This register can be read using the ESR query Each of these status bits can set the ESB bit of the Status Byte Register causing a SRQ to occur IF the ESB bit is enabled to do so The Standard Event Status Enable Register ESE program message determines which of these flags are able to assert the ESB bit The description of these bits are given as e PON Power On Bit 7 Indicates that the PPCK power has been cycled since the last time this bit was read or cleared e URQ User Request Bit 6 In
100. ed dest 2 1 Net change in pressure over the leak check AP 0 02 psi H3 time period Rate 0 026 sec 2 Indicator of range in which leak check was run BW 3 Average rate of change of pressure over the leak 3 check time period Pressing ENTER from the leak check results screen following execution of a leak check starts a new leak check routine directly without having to go through the leak check menu Pressing ESCAPE returns to the main run screen efl Pressing ENTER while counting down a leak check or when in leak check results screen starts a new leak check sequence RES RESOLUTION PURPOSE To set the resolution with which measured pressures and other indications and settings are displayed PRINCIPLE The resolution with which the pressure measured by PPCK is displayed can be adjusted This feature can be used to reduce the resolution when lower precision measurements are being made and additional digits might confuse or distract the operator The resolution setting determines the number of digits with which pressure is displayed The desired resolution is calculated based on the full scale of the range and then rounded to the furthest digit to the right wl The default resolution setting is 0 001 The maximum resolution setting is 0 0001 OPERATION To access the resolution function press RES The display is Measure resltn H3 0 0010 FS lt and gt Use the lt and gt
101. eeceecennaeeeeseeeeanaaeeesseeeanaaeeeesons 69 4 1 Le TEE 69 4 2 INTERFACING EEN 69 4 2 1 RS232 INTERFACE D I 4 2 1 1 COM1 D D I 4 2 1 2 lIEEE 488 arisini ni ee 40 BDV dere 70 2001 DH Instruments Inc Page ii PPCK Operation and Maintenance Manual H 4 3 PROGRAMMING FORMATS eer Ee 71 4 3 1 CLASSIC PROGRAM MESSAGE FORMAT EE 71 4 3 2 ENHANCED PROGRAM MESSAGE FORMAT 71 4 3 2 1 ENHANCED PROGRAM MESSAGE USING THE COMMAND TEE 72 4 3 2 2 ENHANCED PROGRAM MESSAGE USING THE QUERY TEE 72 EM 73 AAA REESEN Eeer eebe 73 4 4 2 ERROR TEE 75 4 4 3 PROGRAM MESSAGE DESCRIPTION OVERVIEW 76 4 4 4 PROGRAM MESSAGE DESCRIPTIONS ssesssssssssssscccccccccssssssssssssssssssssssssssssssssecseeseesessessesessssssssssssssssssssssesse 77 4 5 STATUS REPORTING SYSTEM 107 4 5 1 ERROR QUEUE erte eebe 107 4 52 STATUS BYTE HEGISTER Abend e 108 4 5 3 STANDARD EVENT REGISTER ssssssssssssssssssssssssssssssssssssssssesssssssssssssssssssssssussusssssssseseseeseesesessessssssesssesseees 110 4 5 4 READY STATUS REGISTER csssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssussssssscessseesesessessessssseesssssesses 111 4 6 IEEE STD 488 2 COMMON AND STATUS PROGRAM MESSAGES EEN 111 4 6 1 PROGRAM MESSAGE DESCRIPTIONS EE 112 5 MAINTENANCE ADJUSTMENTS AND CALIBRATION 115 CS Dk TEE 5 2 CALIBRATION OF REFERENCE PRESSURE TRANSDUCERS 5 24 PRINCIPLE E
102. ement mode and return to the main run screen Press ESCAPE to maintain the old ZOFFSET and return to the main run screen w i The value of ZOFFSET is always displayed and entered in Pascal Pa wii The value of ZSTD is entered in the current pressure units Run Autoz By Com2 Absolute Mode Only AutoZ by COM2 allows the value of ZSTD see Section 3 4 1 PRINCIPLE How AutoZ Works to be read automatically from a DHI RPM3 connected by RS232 interface to the PPCK COM2 port To access run AutoZ by COM2 press SPECIAL and select lt 1AutoZ gt lt 4run gt lt 2COM2 gt The display is 1 2 A a 1 Pressure reading units and mode of the active 14 10 psi a H3 RPT fange ZSTD 14 07 Active range indicator Pressure reading of the RPM connected to e i PPCK s COM2 port Page 53 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual When Ready press ENTER The next old ZOFFSET 0 0 Pa display is New ZOFFSET 756 8 Pa The new ZOFFSET is the ZOFFSET calculated from this execution of run AutoZ Press ENTER to activate the new ZOFFSET and return to the main run screen Press ESCAPE to maintain the old ZOFFSET and return to the main run screen w i For PPCK to communicate with an RPM connected to it s COM2 port the PPCK and the RPM RS232 interfaces must be set up properly see Section 3 4 4 3 If the PPCK is unable to locate an RPM on COM2 when running AutoZ by COM2 after 6 seconds
103. en set a very slow pressure ramp during which valid comparative measurements between the PPCK and the DUT can be made Static control is not intended to set and maintain pressure at a specific value but rather to establish a very low rate of change of pressure near a nominal target value The advantage of static control mode is that pressure can be set and or measured without the random interference that is typical of a dynamic pressure control system This can allow pressure control errors to be completely eliminated from the measurements In addition static control mode is almost always faster than dynamic control mode because the hunt time required to zero in on a specific set value is eliminated In static control mode test measurements are made when a Ready condition occurs Ready occurs when the current pressure value is within the hold limit and the rate of change of pressure is less than the stability limit see Sections 3 1 2 5 3 2 6 When Ready occurs the reference pressures applied to the test system is not the set pressure requested it is the momentary pressure value read back from the PPCK Since the pressure is evolving very slowly in a fixed ramp at less than the stability test rate measurements between the PPCK and the DUT can be compared very precisely by averaging the two over short periods During static pressure control the hold limit is active If the current pressure goes outside of the hold limit a Not Ready c
104. ent of the range Example Cmd sent HS 01 enhanced Query reply 0 0100 Example Sent HS 01 classic Reply 0 0100 Errors ERR 6 The n argument was invalid See Also 3 1 2 3 3 1 2 4 3 1 2 5 3 2 3 3 2 6 HS IF Purpose Increase the pressure at the fast rate Command IF o Classic F n Arguments N 0 Stops the pressure increase 1 Starts the pressure increase Remarks PPCK will set and maintain the fast increase pressure rate Care must be used as the pressure will not stop increasing until IF 0 or ABORT is sent or the upper limit is passed Example Cmd sent IF 1 enhanced Reply 1 no reply if IEEE 488 Example Sent F 1 classic Reply F 1 Errors ERR 6 The n argument is a 0 or a 1 See Also 3 1 2 2 ABORT DF DS DF UL RATES RS IP Purpose Increase the pressure a given amount Command IP vg Classic P n Arguments N The increase in pressure desired current pressure units Remarks PPCK will increase the pressure by the specified amount and stop Example Cmd sent Ip 2 enhanced Reply 2 000 kPa no reply if IEEE 488 Example Sent P 2 classic Reply 2 000 kPa Errors ERR 6 The n argument is not within given limits See Also DP Page 85 2001 DH Instruments Inc PPCK Operation and Maintena
105. er to Sections 5 2 1 5 2 2 and 5 2 3 in this manual and then refer to the CalTool for RPTs Software Manual supplied on the General Accessories Disk 525 EDITING AND VIEWING RPT CALIBRATION INFORMATION O PURPOSE RPT calibration information is available for each RPT range Fields include e The calibration date e The value of ZNATERR see Section 5 2 6 e The value of PA see Section 5 2 1 1 e The value of PM see Section 5 2 1 1 These fields can be viewed and or edited Viewing and editing calibration information is range specific 2001 DH Instruments Inc Page 120 PPCK Operation and Maintenance Manual DHI O OPERATION Select the desired range from the main run screen using the RANGE function To view or edit calibration information for the active range press SPECIAL and select lt 4Internal gt lt 2Cal gt lt 1RPT gt Select lt 1view gt or lt 2edit gt The lt 1view gt selection displays the calibration information fields The lt 2edit gt function displays the fields and allows them to be edited The display is am am Cal date 20000315 H3 ZNATERR 0 0 Pa z If in edit mode the calibration information fields can be edited Pressing ENTER from the ZNATERR field goes to the next view edit screen E 2 E PA 0 0 Pa H3 1 Edit field for value of PA if in edit mode PM 1 000000 2 Current RPT measurement range 3 Edit field for value of PM if in edit mode e A If in edit mode the calibratio
106. error is put into a FIFO Error Queue The ERR program message pulls and replies the oldest error message available OK will be replied if there are no error messages left Example Query sent ERR enhanced Query reply Numeric argument missing or out of range Example Sent ERR classic Reply Numeric argument missing or out of range See Also 4 4 2 GPIB Purpose Read or set the GPIB interface address Command GPIB addr Query GPIB Classic GPIB adar GPIB Defaults GPIB 10 Arguments addr The address of the GPIB488 interface 1 to 31 Remarks The GPIB address will be changed following the reply of this command Example Cmd sent GPIB 21 enhanced Query reply 21 Example Sent GPIB 21 classic Reply 21 Errors ERR 6 The argument is not within given limits See Also 3 4 4 3 Page 83 2001 DH Instruments Inc PPCK Operation and Maintenance Manual HEAD Purpose Read or set the head settings Command HEAD h u g Query HEAD Classic HEAD h u g HEAD Defaults HEAD 0 cm N2 Arguments H The height of the test in relation to the PPCK This will be positive if the test is above the PPCK or negative if below the PPCK This value can be between 9999 and 9999 Setting this value to 0 will disable the head correction
107. esessesaeseeseeaevaevassaesneneneesesanvansa 7 2 1 2 INSPECTING te el LTC LCE 7 2 2 SITE REQUIREMENT Oraa rr ee eege EE 8 2 3 INDTIAL SE TU aE AT TTT 8 231 PREPARING FOR OPERATION cccccsssssssssssssssseseevseseseeseeseesesseseeseesevaesaesaeseesessesaeseuseeaevaesaesneseneasensesaevanse 8 2 3 2 FRONT AND REAR PANE LG 0 cccccssssssssssssseesessessesseseeseesessesseseeseesevaesaesaeseesesseesesaeseeseeaevaesaesaesesauneusesanvansn 9 29 21 FRONT PANEL ees eege EE EEN dEr 9 2 3 2 2 REAR PANEL AGGEMDLN ENEE 10 2 3 3 POWER CONNECTION cccctscsssssesseseesessesseseeseesesseseennesevsesensaeees wl 2 3 4 CONNECTING THE HIGH PRESSURE SUPPLY SUPPLY PORT wel 2 3 5 CONNECTING TO THE DEVICE UNDER TEST TEST PORT 00 wel 2 3 6 CONNECTING THE DRIVE PRESSURE SUPPLY DRIVE IN PORT we l2 2 3 7 DRIVE OUT PORT sisiiecctcsssessansccstecactnnstiseniiancandasduanneesincannsnuntenisdaeasandasesevssessiandaveshsas sda suseduansudslunsosavassanadabadeasens 12 Sech VENT PORT eeii ccacvsccassssasssnsvandeunsansstnstanssvesustesnicsestvndusnsbsstunnsaaduuncautentadsauvabseuedissinaadisusacstndsestssnasuanacdhieecarss 13 2 3 9 THE DRAIN PORT ccce eee ONE 2 3 10 THE ATM PORT BAROMETER cscccsssssssssssssseseesessesseseeseseeseeseeseesevsevsesesaeseeseeaesaesaeseesevsessesaenesassaeeneas 13 2 4 POWER UP AND VERIFICATION ccseccsseeesseeenseeesseeenseeeneeaeaseeeaeasaseasaeeasaseeeaeeasaseasaseeeaseeea
108. evice This message received by the COM2 port must be terminated with a carriage return or a carriage return and a line feed Only one message will be retained by the COM2 port The label COM2 will precede the message text If the COM2 receive buffer is empty then the reply will just be COM2 Example Cmd sent PASSTHRU VER enhanced Query reply COM2 DH INSTRUMENTS INC PPCK VER1 01a Query reply COM2 If the COM2 buffer is empty Example Sent PASSTHRU VER classic Reply COM2 DH INSTRUMENTS INC PPCK VER1 01a Reply COM2 If the COM2 buffer is empty See Also COM2 2001 DH Instruments Inc Page 88 PPCK Operation and Maintenance Manual DHI e PCALN HI Purpose Read or set the user RPT calibration information The PPCK RPT is always the Hi RPT Command PCALn HI adder mult CalDate Query PCALn HI Classic PCALn HI adder mult CalDate PCALn HI Defaults PCALn HI 0 0 1 0 800101 Arguments N The RPT range 1 for the low 2 for the medium 3 for the high range of the selected RPT Hi or Lo adder The RPT calibration adder PA from 10 000 to 10 000 Pa mult The RPT calibration multiplier PM from 0 9 to 1 1 CalDate The date of the calibration in the format YYMMDD Remarks The user defined pressure calibration info
109. eypad and four manual pressure control keys on the front panel 311 MAIN RUN SCREEN The PPCK 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 PPCK to set and read pressures It provides EE Ge on the system s current configuration and operating status iT ot ol P 10 Ready Not Ready indication see Section 3 1 2 5 i j SECH a w lt gt Wen Ready lt f gt or ls indicating direction of measured pressure evolution if Not Ready PRESSUREL UNITM hzSR PRESSURE1 Numerical value and sign of pressure TPRESSURE2 CC NN NN measured by active RPT and range 3 UNIT Current pressure unit of measure see l 8 Section 3 2 2 Pressure measurement mode lt g gt gauge lt a gt absolute see Section 3 2 2 Head correction indication Indicates whether a head correction is applied lt h gt if applied lt gt blank if not see Section 3 2 7 Autozero indication Indicates whether the autozero function is ON or OFF lt z gt if ON lt gt blank if OFF see Section 3 4 1 Range indicator Indicates lt H gt for high RPT and lt 1 gt for low range lt 2 gt for mid range lt 3 gt for high range see Section 3 2 1 Sequence counter Not used in PPCK Control mode indicator Pressure control mode lt S gt for static lt D gt for dynamic
110. for a detailed explanation of each control mode and its advantages the default control parameters and the Custom Control options See Table 4 for a summary of the two control modes Table 4 Static and Dynamic Pressure Control Modes Summary CONTROL MODE ADVANTAGES DISADVANTAGES BEST USED Static Control error can be May require When data completely averaging of DUT acquisition from the eliminated readings for best DUT is automated Minimizes pressure results allowing averaging setting time Ready When testing of the DUT to Ready multiple DUTs final readings Provides maximum pressure is not When minimizing tolerance for leaks in exactly the same for uncertainty is a test volume each DUT at a set priority point When reducing Set pressure is not pressure setting time equal to target is a priority pressure Dynamic 2001 DH Instruments Inc Set pressure is equal to target pressure When testing multiple DUTs final pressure is the same for all DUTs at each set point Page 22 Control error is added to measurement uncertainty Increases pressure setting time Ready to Ready Limited tolerance of leaks in test volume When DUT readings must be recorded manually When it is imperative that the final pressure be equal to the set pressure requested PPCK Operation and Maintenance Manual DHI Static Control Static control mode is designed to bring the pressure near the target value and th
111. function key to support his her six most commonly used units OPERATION To customize the UNIT function key from the main run screen press SPECIAL and select lt 3PresU gt The display is 1 Set up user unit 6 1 Entry field to select which unit position 1 6 of the UNIT function key menu is to be changed Enter the number of the unit position that you would Unit 6 1ST 2other like to change The display becomes 3user Select the desired pressure unit category SI units include units based on SI such as mmHg then select the desired unit from the unit menu The units available are listed in Table 8 Table 8 UNIT Function Available Units lt 1Pa gt lt 1psi gt lt 2kPa gt lt 2psf gt lt 3MPa gt lt 3inHg gt lt 4mbar gt lt 4inWa gt lt 5bar gt lt 5kcm2 gt lt 6mmHg gt lt 6none gt lt 7mmWa gt The UNIT function display may include less than six units To delete the current unit from the UNIT screen and show no unit select lt 2other gt lt 6none gt for that unit number Page 55 2001 DH Instruments Inc PPCK Operation and Maintenance Manual If lt 3user gt is selected the user unit must be defined The display is Define user unit 1 Entry field 1 0000000 Units PA Enter the number of user units per Pascal Pa in the entry field Pressing ENTER defines the user unit and returns to the lt Set up unit gt screen wi See Section 7 2 for the pressure unit conversion
112. g AutoZ see Section 3 4 1 3 changing the value of ZNATERR between RPT calibrations may invalidate the autozero function for that range Run ZNATERR should not be used between calibrations RPT CALIBRATIONAD USTMENT WITHOUT CALTOOL FOR RPTs SOFTWARE PRINCIPLE The PPCK reference pressure transducer can be calibrated and adjustments made without using CalTool for RPTs software This requires e Applying pressures with a calibration standard and recording the pressures measured by PPCK e Calculating new PA and PM values and entering them e Setting ZNATERR for the calibrated range if the RPT will be operated in absolute measurement mode and the autozero function will be used between calibrations Ei Before proceeding to calibrate a reference pressure transducer without using CalTool for RPTs software Sections 5 2 1 5 2 2 5 2 3 should be reviewed thoroughly 2001 DH Instruments Inc Page 122 PPCK Operation and Maintenance Manual DH O OPERATION The typical procedure for calibrating an RPT range is o Set up and prepare the PPCK for calibration see Sections 5 2 2 5 2 3 From the main run screen using the RANGE function key select the range to be calibrated see Section 3 2 1 Set the HEAD to zero using the HEAD function see Section 3 2 7 Turn AutoZ ON if it is left ON in normal PPCK operation see Section 3 4 1 Pressing SPECIAL lt 4Internal gt lt 2Cal gt lt 1RPT gt lt 1v
113. gt lt 9Log gt The oldest logged event appears Pressing ENTER steps through the logged events from the oldest to the most recent and ending with the option to clear the log YES or NO If NO events have been logged lt End of log gt displays Page 67 2001 DH Instruments Inc PPCK Operation and Maintenance Manual NOTES 2001 DH Instruments Inc Page 68 PPCK Operation and Maintenance Manual 4 REMOTE OPERATION 4 1 OVERVIEW Most of the PPCK front panel functions can also be executed by commands from a remote computer The host computer can communicate to the PPCK using the PPCK COM1 RS232 port or the IEEE 488 port Before writing code which makes use of PPCK remote commands familiarize yourself with its operating principles by reading Sections 2 and 3 of this manual 4 2 INTERFACING Sending a program message to the PPCK will place it into remote mode The remote indicator in the lower left hand corner of the PPCK front panel lights when the PPCK is in remote mode It also flickers when a program message is received The menus usually accessed from the front panel are locked out while in remote The ESCAPE key returns the PPCK to local operation unless the REMOTE program message was sent to the unit which locks out all keypad operation 421 RS232INTERFACE 4211 COM The PPCK COM1 RS232 interface is located on the back of the unit It is a 9 pin female DB 9F connector configured as a D
114. he PPCK will always reply to a query You must wait for this reply before issuing another program message If this field Query is not listed in the program message description then the Query type for the program message is not supported when using the Enhanced format Classic This is the Classic program message syntax to send data to the PPCK to execute a PPCK function or to query for data This type of command is not recommended for new applications The PPCK must be set to use the classic format see Section 4 3 It may be followed by a and additional argument characters to show that argument s can be passed If there are multiple arguments then commas must separate them The PPCK will always reply to a Classic program message You must wait for this reply before issuing another program message If this field is not listed in the program message description then it is not supported when using the classic format Arguments If the program message can be used to set data inside the PPCK then this section describes the arguments and their limits Default If the program message can be used to set data inside the PPCK then this line shows using the enhanced format the default setting from the factory Remarks This field has the details and remarks about the command Example Examples are given for the enhanced and classic methods Enhanced An example of the use of an enhanced method program
115. he generation The fast rate default is the PPCK full scale in 60 seconds and the slow speed is 10 of the fast Example Cmd sent RATES enhanced Query reply 50 000 pes 5 000 psi s Example Sent RATES classic Reply 50 000 psi s 5 000 psi s Errors ERR 6 Invalid argument See Also 3 1 2 2 DF DS IF IS RS 2001 DH Instruments Inc Page 94 PPCK Operation and Maintenance Manual e READYCK Purpose Read or set the ready check flag Command READYCK 1 Query READYCK Classic READYCK 1 READYCKk Remarks The internal ready check flag is cleared whenever the PPCK reaches a Not Ready NR condition The READYCK query will return the status of this flag This flag is set by sending the READYCK 1 program message while the PPCK is in a Ready condition You can then use READYCKk program message query at a later time to determine if a Not Ready NR condition has occurred since Example Cmd sent READYCK 1 enhanced Query reply 1 if PPCK condition has stayed Ready 0 if PPCK condition has NOT stayed Ready Example Sent READYCK 1 classic v2 01 Query reply READYCK 1 if PPCK condition has stayed Ready amp up READYCK 0 if PPCK condition has NOT stayed Ready Example Sent READYCK 1 classic v2 00
116. he pressure a given amount DPG Obsolete PPC2 Command DRV Read or set the status of an the external valve drivers DS Decrease pressure slowly ERR Read the last error message GPIB Read or set the GPIB interface address HEAD Read or set the head settings HOLD Obsolete PPC2 Command HS Read or set the current control hold limit in pressure HS Read or set the current control hold limit in percent full scale IF Increase the pressure quickly IP Slowly increase the pressure a given amount IS Increase the pressure slowly ISO Obsolete PPC2 Command LOCAL Returns control to the PPCK front panel MEM Read the power up memory test status MODE Read or set the current pressure control mode MSGFMT Read or set the type of program message format to use PASSTHRU Send a command string out of the PPCK COM2 port PCALd LO Read or set the user Lo RPT calibration information PPCK has no Lo RPT PCAL4d HI Read or set the user Hi RPT calibration information for the specific range PPC Obsolete PPC2 Command PR Read the next PPCK RPT pressure Page 73 2001 DH Instruments Inc PPCK Operation and Maintenance Manual Table 12 Program Message List Continued PRR Read the next PPCK RPT pressure rate and ATM PS Set a new target pressure and start automated pressure control PSF Set a new target
117. hin PPCK measurement tolerances see Section 1 2 2 If the values do not agree within tolerances PPCK may need calibration or repair 24 2 2 CHECKING GAUGE MODE PRESSURE MEASUREMENT If the PPCK is not vented press the VENT manual pressure control key to vent the PPCK VENT LED ON see Section 3 1 2 2 Open the TEST port as well to be sure the RPT is exposed to atmospheric pressure Press the UNIT function key and select lt gauge gt mode see 3 2 2 Change the pressure unit if desired see Section 3 2 2 2001 DH Instruments Inc Page 14 PPCK Operation and Maintenance Manual H 2 5 Observe that within 60 seconds the VENT LED flashes and zero is indicated Itis normal for PPCK to indicate a value other than zero for up to 60 seconds when first entering gauge mode Using the RANGE function key to change ranges observe that zero is indicated for each range within 60 seconds When gauge mode is first entered or ranges are changed it is normal for PPCK to indicate a value other than zero when vented After up to 60 seconds the VENT LED should flash and zero should be indicated If this does not occur check that the AUTOZERO function is ON see Section 3 4 1 and that the TEST port is truly exposed to atmospheric pressure If the display will not zero PPCK may need repair 243 LEAKCHEK If desired perform a leak check of the test system see Section 3 2 8 244 CHECK PROPER PRESSURE CONTROL OPERATIO
118. iew gt read and record the current values of PA and PM Pressing SPECIAL 1Autoz 2View read and record the current value of ZOFFSET for absolute mode only Allow the PPCK to warm up with power on for at least 30 minutes before running the calibration Apply the calibration pressure for each point normally atmosphere FS zero in 20 increments Dwell at least two minutes after setting the reference pressure at each point to allow full stabilization Record the pressure the value of the pressure applied by the reference and the value indicated by the PPCK at each point The data recorded is the as received data for this calibration Enter the calibration pressure and PPCK readings into a computerized spreadsheet Calculate the non corrected PPCK readings by backing out the PA PM and ZOFFSET absolute mode only recorded in Steps and oO above following non corrected reading corrected reading PA ZOFFSET PM Perform a linear regression to find the offset and slope that best fit the non corrected PPCK readings to the calibration standard pressures The offset is the new value of PA the slope is the new value of PM Press SPECIAL and select lt 4Internal gt lt 2Cal gt lt 1RPT gt lt 2edit gt and write the new calibration date and the new values of PA and PM for the RPT and range calibrated Press SPECIAL and select lt 4Internal gt lt 2Cal gt lt 1RPT gt lt 3run ZNATERR to run th
119. il PPCK automatically determines the volume thermal pressure control TPC is only used in dynamic control mode Therefore the volume configuration routine only executes when dynamic control mode is active w i Due to the high compressibility of low pressure gas the configuration routine does not produce reliable results at when run at a starting pressure under 1 MPa 150 psi Therefore the volume configuration routine cannot be run under 1 MPa 150 psi Page 57 2001 DH Instruments Inc PPCK Operation and Maintenance Manual O OPERATION 344 2 2001 DH Instruments Inc weil PPCK uses self diagnostics to determine when to run the TPC configuration routine in dynamic control mode Therefore it is not normally necessary to run the configuration routine separately Running the Config routine may cause the set pressure to increase or decrease by up to 1 4 MPa 200 psi The dynamic control mode volume determination routine may be run at any pressure greater than 1 MPa 150 psi Dynamic pressure control mode must be active To run the volume determination routine first set a pressure above 1 MPa 150 psi Then press SPECIAL and select lt 4internal gt lt 1Config gt The display is Run config lYes 2No Selecting lt 1Yes gt causes the volume determination routine to run While the routine is running lt Running config gt flashes on the bottom line of the PPCK display Completing the routi
120. ing a specific range and measurement mode Automated pressure control target values above the upper limit will not be accepted and manual pressure control keys will abort off when the upper limit is reached Upper limit settings are specific to each range H1 H2 H3 and measurement mode gauge or absolute The UPPER LIMIT function is most often used to protect the device or system connected to the PPCK TEST port from accidental overpressure wl If no upper limit value is entered by the user the upper limit for each range and measurement mode is set by default to 105 of each range and measurement mode for ranges H3 and to 115 of each range for all other ranges 2001 DH Instruments Inc Page 34 PPCK Operation and Maintenance Manual DHI Q OPERATION When the UPPER LIMIT function key is pressed from the main run screen the display is Upper Limit H3 1 6300 psi a El Enter the desired upper limit value and PPCK returns to the main run screen with a new upper limit value active Entry field to enter desired upper limit value When the UPPER LIMIT has been exceeded the display of current pressure flashes and an intermittent beep sounds To return to normal operation reduce pressure using manual pressure control keys or an automated pressure command 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 th
121. its are not allowed with a gauge RPT See Also 3 2 2 7 2 3 4 3 2001 DH Instruments Inc Page 104 PPCK Operation and Maintenance Manual DHI e VENT Purpose Read execute or abort a vent process Command VENT n Query VENT Classic VENT VENT Arguments n 1 to start a vent process 0 to abort a vent process and close the exhaust valve Remarks The PPCK vents by generating close to atmosphere and then opening the exhaust valve This program message query will return a O if the exhaust valve is closed or a 1 if the exhaust valve is open Example Cmd sent VENT 1 enhanced Query reply 0 if not vented 1 if vented Example Sent VENT 1 classic Reply VENT 0 if not vented VENT 1 if vented Errors ERR 6 The argument is not a 0 or a 1 See Also 3 1 2 2 VER Purpose Read the PPCK version Query VER Classic VER Remarks The software version of the PPCK can be read This is useful for checking presence of the PPCK and for reference purposes Example Query sent VER enhanced Query reply DH INSTRUMENTS INC PPCK Ver1 00 Example Query sent VER classic Query reply DH INSTRUMENTS INC PPCK Ver1 00 See Also None Page 105 2001 DH Instruments Inc PPCK Operation and Maintenance Manual
122. justment PPCK can be controlled locally by the operator through the front panel display keypad and special function keys or remotely over an RS232 or IEEE 488 interface using ASCII character command strings Page 1 2001 DH Instruments Inc SPECIFICATIONS 121 Power Requirements Operating Temperature Range Storage Temperature Range Vibration Weight Dimensions Microprocessor Communication Ports Pressure Ranges Operating Medium Pressure Supplies Pressure Connections Pressure Limits 122 PPCK Operation and Maintenance Manual GENERAL SPECIFICATIONS 85 to 264 VAC 47 to 440 Hz 60 VA max consumption 15 to 35 C 20 to 70 C Meets MIL T 28800D 15 4 kg 34 Ib 18 cm H x 32 cm W x 40 cm D 7 1 in H x 12 6 in W x 15 8 in D Motorola 68302 16 MHz RS232 COM1 RS232 COM2 IEEE 488 2 Each PPCK has three ranges H1 H2 H3 Ranges are from 0 to 1 000 psi 7 MPa to 0 to 10 000 psi 70 MPa See Table 1 Any clean dry non corrosive gas SUPPLY port Range H3 5 supply pressure must remain constant 1 to meet control specifications DRIVE IN port 700 850 kPa 100 120 psi supply must remain constant 5 to meet control specifications High Pressure Supply DH200 F Test and Drain DH200 F Vent 1 8 in NPT F Drive In 1 8 in NPT F Drive Out 1 8 in NPT F ATM on board barometer 10 32 UNF Note DH200 F is a gland and collar type fitting for coned and lef
123. keys are also available to adjust pressure directly without a target value see Section 3 1 2 2 Pressures set manually are not controlled after the setting process wl For information on PPCK s pressure control technology see Section 3 1 2 3 OPERATION To set a pressure press SET P from the main run screen The display is 1 1 Ready Not Ready indication current pressure units ES measurement mode range regular first line of main 2000 00 psi g H3 ee 2 Entry field for target value of pressure to be EE 3000 00 set automatically Comes up with last entry or zero if 1 pressure measurement units have been changed range 2 has been changed or system has been vented Use the numerical keys and editing keys to enter the target pressure value desired see Section 3 2 10 1 for information on zero pressure commands Also the lt and gt keys can be pressed to jog the current target pressure value displayed down or up by the current pressure control hold limit 2001 DH Instruments Inc Page 42 PPCK Operation and Maintenance Manual DHI e Press ENTER to start pressure control to the target pressure in the current control mode see Section 3 2 3 and return to the main run screen The main run screen is 1 T 2547 95 psi a H3 2 T 3000 00 DC Ready Not Ready indication current pressure units measurement mode range regular first line of main run screen Current control mode indicator Flashe
124. keys to select the desired level of resolution Press ENTER to set the resolution and return to the main run screen elo resolution setting affects the display of the measured pressure as well as other indications and settings F the resolution setting is range specific A resolution setting made in one range does NOT affect other ranges Page 41 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 3210 SET P SETTING PRESSURE AUTOMATICALLY Q PURPOSE To set a pressure automatically See Sections 3 2 3 3 1 2 4 for information on setting the control mode Static or Dynamic PRINCIPLE PPCK automatically sets and holds pressure to a user designated target value This feature allows pressure values to be set easily and precisely by simple numerical entry from the front panel or by remote command see Sections 3 1 2 3 3 1 2 4 Automatic pressure setting is controlled from the main run screen using ENTER and SET P from the main run screen SET P causes the pressure target entry screen to be displayed and then launches automated pressure control ESCAPE aborts automated pressure control PPCK supports two pressure control modes to meet different pressure setting and controlling requirements static and dynamic see Section 3 1 2 4 Control initiated using SET P executes in the current control mode Use CONTROL to change control modes see Section 3 2 3 Manual pressure control
125. ks To access run Autoz press SPECIAL and select lt 1AutoZ gt lt 4run gt If the measurement mode of the current range is gauge run AutoZ occurs transparently to the user whenever AutoZ is ON and the PPCK is in the vented condition The display is Rng H3 is gauge 1 Indication of current range no manual Autoz Page 51 2001 DH Instruments Inc PPCK Operation and Maintenance Manual If the measurement mode of the current range is absolute the display is Keel SC Autoz H3 abs by 2 Current measurement mode 1Entry 2COM2 3 Selection of source of ZSTD for ZOFFSET Sy determination EEN Current range Selecting lt 1Entry gt allows the value of ZSTD to be entered from the front panel keypad Selecting lt 2COM2 gt allows the value of ZSTD to be read automatically from an RPM interfaced with PPCK s COM2 communications port Ei Allow the PPCK to stabilize at atmospheric pressure and ambient temperature for 5 to 10 minutes before running AutoZ If running AutoZ results in values of ZOFFSET that are greater than 0 015 FS of the current PPCK measurement range the PPCK and or the source of ZSTD may be out of tolerance or the AutoZ process may have been faulty Before activating a new ZOFFSET greater than 0 015 FS of the current PPCK range check to be sure that both the PPCK and the source of ZSTD were in good working order properly vented to stable atmospheric pressure at the same height
126. l mode using the CONTROL function while in that range wl Custom control parameters are range and control mode specific Changes made in one range and control mode are stored for that range and control mode and will be recalled when that range and control mode is returned to Changes made in one range and control mode do not affect any other range control mode setting When custom control parameters are active a lt C gt is appended to the control mode indicating character lt S gt for static lt D gt for dynamic in the middle of the bottom line of the main run screen see Section 3 1 1 3261 TURNING OFF CUSTOMCONTROL PARAMETERS To return to default pressure control parameters for the active range and control mode select the control mode using the CONTROL function see Section 3 2 3 Making a control mode selection automatically sets the control parameters to default values Page 37 2001 DH Instruments Inc PPCK Operation and Maintenance Manual HEAD PURPOSE To cause a pressure value representing a difference in height to be added to the pressure measured by the PPCK reference pressure transducer PRINCIPLE PPCK s reference pressure transducers measure gauge or absolute pressure at the height of the rear panel TEST port Frequently when performing a calibration or test the device or system under test is at a different height than the PPCK s TEST port This difference in height frequently called head ca
127. l be sent at the old COM1 settings but all subsequent communications will be accomplished at the new COM settings Example Cmd sent COM1 9600 N 8 1 enhanced Query reply 9600 N 8 1 Example Sent COM1 9600 N 8 1 classic Reply 9600 N 8 1 Errors ERR 7 Missing or improper program message argumeni s See Also 3 4 4 3 PASSTHRU COM2 Purpose Read or set the RS232 settings for the COM2 port Command COM2 baud parity data stop Query COM2 Classic COM2 baud parity data stop COM2 Arguments baud The baud rate This may be 300 600 1200 2400 4800 9600 or 19200 parity The data parity This may be O for odd E for even or N for none Data The number of data bits This may be 7 or 8 stop The number of stop bits This may be 1 or 0 Defaults COM2 2400 E 7 1 Remarks The COM2 port can be used to allow the host computer to communicate through the PPCK to an additional device connected to COM2 This can be useful if the Host computer does not have 2 serial ports available Example Cmd sent COM2 9600 N 8 1 enhanced Query reply 9600 N 8 1 Example Sent COM2 9600 N 8 1 classic Reply 9600 N 8 1 Errors ERR 7 Missing or improper program message argumeni s See Also 3 4 4 3 PASSTHRU 2001 DH Instruments Inc Page 80 PPCK Operati
128. l mode test measurements are made when a Ready condition occurs Ready occurs when the set pressure is within the hold limit The reference pressure value applied to the test system is assumed to be equal to the nominal pressure set value when Ready occurs During dynamic pressure control the hold limit is active If the pressure goes outside of the hold limit a Not Ready condition will occur see Section 3 1 2 5 See Sections 3 1 2 4 and 3 2 3 for default hold limit values See Section 3 2 6 for setting the hold limit to a user defined value During active dynamic pressure control the stability limit is not used The stability limit is used as the Ready Not Ready criterion when control is suspended Hold Limit Pressure Continuously Time Adjusted to the Target Value Figure 7 Dynamic Pressure Control Operation 2001 DH Instruments Inc Page 24 PPCK Operation and Maintenance Manual DHI 3125 PRESSURE READY NOT READY PPCK provides a Ready Not Ready indication This indication is intended to provide the user with a clear and objective criterion for determining when a valid pressure measurement can be made On the main run screen the far left character of the top display lines indicates Ready Not Ready In remote command responses Ready Not Ready is indicated by R or NR in the response string Ready Not Ready front panel display indications are e lt gt Pressure Ready e lt J gt Pressure Not Read
129. lected the next screen offers the choice between lt 1gauge gt and lt 2absolute gt Making a selection returns to the main run screen with the selected measurement mode active If lt 1unit gt is selected from the measurement screen the units screen is presented The cursor is on the number corresponding to the active unit for the active range To change the lpsi 2MPa 3kPa pressure unit for the active range select the Abar 5kem2 desired unit Pressing ENTER activates the unit and returns to the main run screen If the pressure unit selected is inWa the reference temperature for water density must be specified When inWa is selected as the unit the next display is Select inWa ref temp 4 C 20 C 60 F Page 31 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual Select the desired reference temperature for water density using the lt or gt key to move the cursor Pressing ENTER returns to the main run screen with inWa based on water density at the selected reference temperature as the pressure unit The current inWa reference temperature can be viewed by observing the position of the cursor in the reference temperature screen wl There are two possible default pressure unit screens one US and one Sl depending on whether the PPCK has been factory set as US or SI Whether the PPCK is set up as US or Sl is indicated by the right two characters on the top line of the PPCK introduction screen
130. lts see Section 3 2 4 e Pressure display resolution to 0 001 FS see Section 3 2 9 e Control mode to dynamic see Section 3 2 3 Page 61 2001 DH Instruments Inc PPCK Operation and Maintenance Manual COM ports and IEEE 488 settings to default see Section 3 4 4 3 Autozero enabled see Section 3 4 1 Screen saver to 10 minutes see Section 3 4 4 8 Reset Units O PURPOSE Sets the six pressure units available under the UNIT function to the SI or US default selections depending on whether the PPCK has been factory set for SI or US See Sections 3 2 2 and 3 4 3 Reset Seq O PURPOSE The SEQUENCE function is not supported in PPCK Reset Cal O PURPOSE A the reset cal function will delete RPT calibration coefficients changing the PPCK calibration Clears all user values affecting the calibration of RPTs and the on board barometer including 2001 DH Instruments Inc Sets all user RPT PA PM values to 0 and 1 see Section 5 2 1 1 Sets user on board barometer PA PM to 0 and 1 see Section 5 3 Sets all ZNATERR values back to zero see Section 5 2 6 Sets all ZOFFSET values back to zero see Section 3 4 1 Page 62 PPCK Operation and Maintenance Manual DHI Reset All O PURPOSE 3446 A the reset all function will clear and delete large amounts of user defined information including critical calibration data Combines all resets in one global reset command that clears
131. lve is being used for a fixed rate generation 2048 Thermal reset is running 4096 Thermal control is active 64536 Generation abort has been requested Example Query sent STAT enhanced Query reply 32 Example Sent STAT classic Reply 32 See Also 3 1 2 3 PS 2001 DH Instruments Inc Page 100 PPCK Operation and Maintenance Manual DHI e TIME Purpose Read or set the PPCK time Command TIME hh mmxx Query TIME Classic TIME hh mmxx TIME Arguments hh mm The time in a 12 hour format using a colon delimiter XX om or pm Remarks The PPCK has an internal real time clock Itis used for date stamping calibrations and log data Example Cmd sent TIME 12 52PM enhanced Query reply 12 52pm Example Sent TIME 12 52PM classic Reply 12 52pm Errors ERR 7 Missing or improper program message argument s See Also 3 4 4 4 TOUT This is an obsolete PPC2 Command Purpose PPCK does not support external devices so the TOUT command is not supported Will respond ERR 9 See None TP Purpose To read the current target pressure Query TP Classic TP Remarks The current target pressure is replied in the current pressure units Example Query sent TP enhanced Query reply 1000 00 kPaa Example Sent
132. message to be sent to the PPCK is shown The message sent to the PPCK appears after the Cmd sent label If only a Query type exists the Query sent label is shown instead Directly under this label Query reply shows a typical reply to a query type Reply shows that a query format does not exist It may have a short description next to it Classic An example of the use of a classic program message to be sent to the PPCK is shown The command sent to the PPCK appears after the Cmd sent label The Reply label shows a typical reply to the Sent example It may have a short description next to it Errors If the program message can report an argument error the types of errors are listed If using the classic format or the COM1 port the error message will be replied after receiving the program message If using the enhanced format via the IEEE 488 port the error condition will be handled by the status reporting model which will store the errors in an Error Queue and can be programmed to assert the IEEE 488 SRQ line to signal an error has occurred In either case the ERR or ERR program message can be used to retrieve a text description of the error See Also Indicates related program messages and refers to manual Sections giving detail on PPCK operation corresponding to the program message 2001 DH Instruments Inc Page 76 PPCK Operation an
133. n cause a significant difference between the pressure measured by the PPCK at its TEST port height and the pressure actually applied to 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 PPCK RPT at its test port in order to accurately predict the pressure actually applied at a different height PPCK can accurately 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 The HEAD function key is used to turn the head correction function ON and OFF and to specify the height difference between the PPCK TEST port and another height The height unit of measure and the test gas are specified by pressing SPECIAL and selecting lt 2Head gt see Section 3 4 2 In PPCK s measurement ranges with gas as the test medium specifying the head height within 30 cm 12 in is adequate to assure that even in the worst case the uncertainty on the head correction will be insignificant relative to the tolerance on the measurement OPERATION To access the HEAD function press the HEAD function key The display is Edit head height 1 Test gas currently specified for the head correction 95 cm N2 2 Entry field for head height 2 Ma 2001 DH Instr
134. n fields can be edited Pressing ENTER from the PM field returns to the view edit screen If editing and changes have been made confirmation of change activation is requested Pressing ESCAPE in any edit screen exits the edit screen without activating any changes 1 Edit field for calibration date if in edit mode 2 Current RPT measurement range 3 Edit field for value of ZNATERR if in edit mode As editing PA and PM values will change the calibration of the RPTs the edit function should only be used by qualified personnel as part of the calibration process Caution should be taken to avoid accidental editing see Section 3 4 4 6 The value of PA is always in Pascal Pa The value of PM is dimensionless Page 121 2001 DH Instruments Inc 527 PPCK Operation and Maintenance Manual SETTING ZNATERR PURPOSE Setting ZNATERR is required as part of the calibration process for absolute RPTs that will be used in the absolute measurement mode if the autozeroing feature will be used between calibrations see Sections 5 2 1 3 4 1 wF ZNATERR is range specific and absolute measurement mode specific There is no ZNATERR for gauge mode Running ZNATERR and activating the new ZNATERR value automatically sets ZOFFSET to zero OPERATION See Section 3 4 1 To set ZNATERR press SPECIAL and select lt 4Internal gt lt 2Cal gt lt 1RPT gt lt 3run ZNATERR gt Procedurally running ZNATERR is identical to runnin
135. nce Manual IS Purpose Increase the pressure at the slow increase rate Command IS n Classic T nt Arguments N 0 Stops the pressure increase 1 Starts the pressure increase Remarks PPCK will increase pressure at the slow increase rate until IS 0 or ABORT is sent or the upper limit is reached Example Cmd sent S 1 enhanced Reply 1 no reply if IEEE 488 Example Sent IS 1 classic Reply IS 1 Errors ERR 6 The n argument is a 0 or a 1 See Also 3 1 2 2 ABORT DF DS IF UL RATES RS LOCAL Purpose Returns control to the PPCK front panel Command LOCAL Classic LOCAL Remark The REMOTE program message can lock the front panel out completely The user can return to local operation by sending the LOCAL program message sending the IEEE 488 GTL command if in enhanced format or by cycling PPCK power Example Cmd sent LOCAL enhanced Reply LOCAL no reply if IEEE 488 Example Sent LOCAL classic Reply LOCAL See Also REMOTE MEM Purpose Read the status from the power up memory test Query MEM Classic MEM Remarks The PPCK system memory stores the user settings units resolution generation settings and retains them when the unit is OFF On power up this memory i
136. ne may take up to 2 5 minutes and cause the pressure to change by 0 7 to 1 4 kPa 100 to 200 psi When the volume determination is complete activate new contig the display is 1Yes 2No Select lt 1Yes gt to activate the new volume determination Select lt 2No gt to retain the old volume determination and return to the main run screen F The volume configuration routine cannot be run under 1 MPa 1 000 psi An error message is displayed if the volume configuration routine is initialized at a pressure under 1 MPa 150 psi CAL PURPOSE To calibrate the PPCK reference pressure transducer RPT and adjust the on board barometer This function is considered part of PPCK maintenance and is therefore covered in the maintenance section of this manual see Section 5 2 PRINCIPLE See Sections 5 2 5 3 and 5 4 OPERATION See Sections 5 2 5 3 and 5 4 Page 58 PPCK Operation and Maintenance Manual DH 3443 REMOTE O PURPOSE To configure the PPCK communication ports including COM1 COM2 and the IEEE 488 interface O PRINCIPLE The PPCK has two RS232 communications ports referred to as COM1 and COM2 and an IEEE 488 GPIB interface Communication with a host computer is accomplished using either COM1 or the IEEE 488 interface COM2 is reserved for connecting an external device e g a multimeter RPM etc The configuration of all the communication ports can be set up through the PPCK front panel O OPER
137. ng to the pressure unit ref The optional unit reference temperature only if the unit is InWa Remarks This program message determines what unit and what measurement mode is used to display pressure measurements Refer to the UNIT section of the manual for a detailed list of the units The unit text must be followed by a if an absolute measurement mode is desired or else a gauge unit will be assumed The unit text can optionally be followed by a g to specify a gauge measurement mode also There can be a space between the unit text and the a or the g If the unit specified is InWa an optional second argument ref can be set The ref can be 4 20 or 60 corresponding to InWa at 4 C 20 C or 60 F If this second argument is not given when the unit is InWa then the reference temperature will be at 20 C The fifth character of the reply will always be a for an absolute unit or g for a gauge unit White spaces will proceed this character if needed The temperature reference will be added to the reply only if the unit is InWa Example Cmd sent UNIT kPaa enhanced Query reply kPaa Sent UNIT InWag 4 Query reply inWag 4dC Example Sent UNIT kPaa classic Reply kPaa Sent UNIT InWag 4 Reply inWag 4dC Errors ERR 7 The unit is invalid ERR 6 The ref is invalid ERR 20 Absolute measurement mode and altitude un
138. nge user level Once a password has been entered the user level cannot be changed without reentering the password If lt 0 gt is entered then the password is made inactive and the user will not be required to enter a password to access the user level menu This is the factory default with a security level of lt 2low gt If there is an active password the PPCK password entry screen will appear The SS eee user must enter the user defined password Password pppppp or the factory secondary password to proceed any further The first field lt nnnn gt is the serial number of the PPCK followed by a second field lt xx gt that represents the number of times that a secondary password has been used This second field increments each time a secondary password is used The third field is where the user enters the password wii The factory secondary password is available in case the user s password has been misplaced or forgotten It can be obtained by contacting DHI Customer Service The factory secondary password is different for all PPCK s and changes each time it is used ATM PURPOSE To view the value of atmospheric pressure as measured by the on board barometer PRINCIPLE PPCK has an independent on board barometer The atmospheric pressure measurements made by the on board barometer are used only for dynamic compensation of atmospheric pressure when using an absolute reference pressure transducer to make gauge pressu
139. ngs Adjust height of fluid head correction Set to zero to defeat head correction noe Runs an automated leak check at the current pressure CHECK Adjust display resolution of measured pressure and other indications and settings oe Set the upper limit pressure alarm for the active range LIMIT e Not used in PPCK Set custom pressure control parameters hold limit stability limit for the current control mode Shows active range and then toggles through available ranges ENTER on a ae S range activates it Change pressure measurement unit and or measurement mode wnt gauge absolute Choice of units can be customized Change pressure control mode static dynamic Set control parameters to contor default by selecting the control mode Give a pressure control set point command from run screen ENTER values when editing Jog the pressure control set point by the amount of the hold limit while controlling or when entering a set point Page 29 2001 DH Instruments Inc PPCK Operation and Maintenance Manual When the RANGE function key is first pressed the active reference pressure transducer RPT and range are displayed For example de Kiel SH Current Hi Rng3 H3 psi 6000g 6000a sli g a a J Identifies RPT currently in use lt Hi gt Identifies current range lt 1 gt lt 2 gt or lt 3 gt of the RPT Range designator Full scale pressure value in the current units for the R
140. ns 3 1 2 4 and 3 1 2 5 PPCK provides system default values for the hold limit and stability limit parameters for each range The default values are those most suitable for the typical user to operate within PPCK specifications The default parameters are automatically set each time the control mode is selected using the CONTROL function key see Table 6 O PRINCIPLE The CUSTOM CONTROL function allows the hold and stability limit parameters to be customized by the user This can be used to increase control speed time to Ready usually by decreasing control precision or to increase precision which usually decreases control speed see Section 3 1 2 5 For example changing the dynamic pressure control hold limit from its default value of 0 01 FS of the current range to 0 02 will decrease the time required to set a pressure achieve a Ready condition since the limit in which the pressure must be set has increased by a factor of two but it will also increase by a factor of two the maximum possible control error included when Ready is indicated wl Adjusting default control parameters using the CUSTOM CONTROL function may result in control parameters that the PPCK is unable to meet so that a Ready condition never occurs This does not indicate a PPCK malfunction just that the control parameters need to be relaxed or set back to default parameters Default Pressure Control Parameters DYNAMIC CONTROL MODE STATIC CONTROL MODE HO
141. ns are as follows lt D gt dynamic control mode with default control parameters lt S gt static control mode with default control parameters lt DC gt dynamic control mode with custom control parameters lt SC gt static control mode with custom control parameters lt VLV gt static or dynamic control mode and a control valve is in the opening process lt M gt manual control mode FLASHING character System is actively controlling pressure NON FLASHING character Control is idle Page 43 2001 DH Instruments Inc PPCK Operation and Maintenance Manual wel In dynamic control mode whenever the pressure is Ready inside the hold limit the display of measured pressure is equal to the target pressure This is because in dynamic control mode when the pressure is Ready it is assumed that the measured pressure equals the target pressure This is not true when setting zero in absolute measure mode see Section 3 2 10 1 w i A target pressure entry that exceeds the current upper limit see Section 3 2 4 or that is out of range will not be accepted as the target value when ENTER is pressed and the buzzer will sound The minimum and maximum in range target will be set See Section 6 if PPCK is unable to control pressure or appears to control pressure poorly Pressing the lt and Lal editing keys on the 4 x 4 keypad can be used while controlling to jog the pressure control target value down or up by the current hol
142. o measure leaks by measuring pressure changes The principle of the Leak Check function is the measurement of pressure increase or decrease The Leak Check function allows a leak check time to be set The total pressure change and the average rate of change over the leak check time are calculated and displayed weil Changing the pressure in a test system causes adiabatic temperature changes in the gas that need to have dissipated before a valid leak measurement can be made In general a 2 to 5 minute wait before running a leak check is adequate to allow the adiabatic temperature change to dissipate sufficiently for valid leak measurements to be made However stabilization time may be much longer as volumes and pressures increase Page 39 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual O OPERATION Use automated see Section 3 2 10 or manual see Section 3 1 2 2 pressure control to set the pressure at which the leak check is to be conducted Once the pressure has been set abort pressure control and wait three minutes for pressure stabilization To access the LEAK function press SETUP lt 5Leak gt The display is Leak Check H3 lrun 2view Press lt 2view gt to view the results of the last leak check executed The results screen displays lt Data NOT available gt briefly and returns to main run screen if NO leak check data is stored i e if the PPCK has never run a leak test or a reset has cleared
143. of the possibility thereof and regardless of whether such products are used individually or as components in other products Items returned to DHI under warranty claim but determined to not have a defect covered under warranty or to not have a defect at all are subject to an evaluation and shipping charge as well as applicable repair and or calibration costs The provisions of this warranty and limitation may not be modified in any respect except in writing signed by a duly authorized officer of DHI The above warranty and the obligations and liability of DHI and its Authorized Service Providers exclude any other warranties or liabilities of any kind 2001 DH Instruments Inc Page 140 Minerva I P amp M B V Nippon CalService Inc DH Products Technical Service Division PPCK Operation and Maintenance Manual Table 22 DHI Authorized Service Providers DH INSTRUMENTS INC AUTHORIZED SERVICE PROVIDERS 2000 JAN COMPANY ADDRESS TELEPHONE FAX NORMAL EMAIL SUPPORT REGION 4765 East Beautiful Lane Phoenix AZ 85044 5318 USA Handelsweg 13 Postbus 76 1270 AB Huizen NETHERLANDS 2 9 1 Sengen Tsukuba Shi Ibaraki Prefecture 305 JAPAN National Institute of Metrology Heat Division Pressure amp Vacuum Lab NO 18 Bei San Huan Donglu Beijing 100013 PR China Tel 602 431 9100 Fax 602 431 9559 jbaines dhinstruments com Tel 31 35 52 54 887 Fax 31 35 52 64 560 minervaipm compuserve com Tel 0298 55 8778 Fax
144. on and Maintenance Manual DHI e CONFIG Purpose Run the configuration routine to optimize the PPCK TPC system for changes in the test volume Command CONFIG Classic CONFIG Remarks Thee PPCK TPC configuration typically takes from 30 to 150 seconds During this period no other PPCK operations or remote commands should take place Allcommands will result in a BUSY reply until the configuration is complete Only the ABORT command will function during this period and will abort the config function The PPCK pressure must be greater than 1 MPa stable and leak free to execute this configuration Example Cmd sent CONFIG enhanced Query reply CONFIG Example Sent CONFIG classic Reply CONFIG Errors ERR 10 The pressure is not less than 1 MPa or the PPCK is not idle See Also 3 4 4 1 DATE Purpose Read or set the PPCK date Command DATE yymmdd Query DATE Classic DATE yymmdd DATE Arguments yymmdd The date in the numerical only format year month day with no spaces Remarks The PPCK has an internal real time calendar clock It is used for date stamping calibrations Example Cmd sent DATE 961201 enhanced Query reply 961201 Example Sent DATE 961201 classic Reply 961201 Errors ERR 7 Missing or improper program message argumeni s See Also 3
145. ondition occurs see Section 3 1 2 5 and pressure is readjusted to be inside the hold limit The hold limit is used to establish the maximum distance from the nominal set point at which data can be taken The wider the hold limit the lower the likelihood of an interruption of the Ready condition to readjust pressure see Section 3 2 3 for default hold and stability limit values and Section 3 2 6 for setting the hold and stability limits to user defined values P r e S Ss u r e Target Pressure Hold Limit Setting pressure Maintaining rate Hold limit Maintaining rate Time to target lower than stability limit reached lower than l stability limit l Resetting pressure to target Figure 6 Static Pressure Control Operation Page 23 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual Dynamic Control Dynamic control mode is designed to set the pressure to the target value and control continuously to keep pressure within the hold limit as close to the target value as possible The advantage of this dynamic control mode is that the final pressure achieved is the same as the target value However unlike static control in dynamic control a control error must be included in the uncertainty on the final pressure applied The maximum value of the control error is equal to the current hold limit The typical value of the control error is generally well inside the hold limit In dynamic contro
146. or additional information Page 119 2001 DH Instruments Inc H 523 PPCK Operation and Maintenance Manual SET UP AND PREPARATION To set up and prepare the PPCK for calibration of an RPT Set the PPCK on a stable surface near the calibration standard at a height as close as possible to the calibration standard s reference height Consider the connections that may need to be made to the rear panel and access to the front panel display and keypad Connect the output of the calibration standard to the PPCK TEST1 port DH200 F See Section 2 3 4 wl DH200 F is a gland and collar type fitting for coned and left hand threaded 1 4 in 6 mm OD tube equivalent to AE SF250C HIP LF4 etc IT MAY DAMAGE THE FITTING AND MAY BE DANGEROUS TO THE OPERATOR TO USE INCORRECT FITTINGS Shut the PPCK VENT if it is open see Section 3 1 2 2 Abort pressure control The PPCK is calibrated with pressure control idle This allows its RPT to be calibrated as a measuring device Pressures are normally generated and adjusted by the pressure standard not by the PPCK Allow PPCK to warm up with power on for at least 30 minutes before running the calibration NEVER apply pressure to the PPCK TEST port that is greater than 105 of PPCK range 3 Damage to internal PPCK RPT could result 524 RPT CALIBRATION USING CALTOOL FOR RPTs SOFTWARE To calibrate PPCK using CalTool software supplied on the General Accessories Disk ref
147. or causes execution to cease or suspend Pressing ESCAPE repeatedly eventually brings you back to the main run screen and from there will allow a momentary viewing of the PPCK introduction screen Pressing changes a numerical sign when editing It also toggles through multiple screens when available Pressing lt or gt allows reverse or forward cursor movement when editing data entry These keys also allow the target pressure value to be jogged up and down while controlling or when editing the target value w i Some screens go beyond the two lines provided by the display This is indicated by a flashing arrow in the second line of the display Press the lt and gt keys to move the cursor to access the lines that are not visible or directly enter the number of the hidden menu choice if you know it 3122 MANUAL PRESSURE CONTROL KEYS The manual pressure control keys provide direct operator control of pressure increase decrease and vent They can be useful in adjusting pressure when automated pressure control to a target value is not needed The manual pressure control keys interrupt and override automated pressure control Pressing the VENT key causes PPCK to execute its vent routine in which pressure is controlled to near atmospheric pressure and then the exhaust valve is fully opened A RED LED just above the VENT key indicates the PPCK is in vent mode The vent valve will remain open until the VENT key is p
148. ossary Section Section 7 3 is useful as a quick reference for exact definition of specific words and expressions as they are used in the manual CAUTION is used in manual to identify user warnings and cautions NOTE is used in the manual to identify operating and applications advice and additional explanations indicates direct function keys e g RANGE lt gt indicates PPCK screen displays eg lt 1yes gt 2001 DH Instruments Inc Page vi PPCK Operation and Maintenance Manual 1 INTRODUCTION 1 1 PRODUCT OVERVIEW PPCK is a stand alone microprocessor driven pressure controller calibrator intended to precisely measure and control precise gas pressure as needed for the calibration and testing of pressure measuring instruments PPCK offers very high performance combined with maximum versatility and ease of use PPCK is designed to cover very high gas pressures especially ranges above 7 MPa 1 000 psi PPCK measures and controls pressure in ranges from 0 to 1 000 psi 7 MPa up to 0 to 10 000 psi 70 MPa in both gauge and absolute measurement modes For pressure ranges of 7 MPa 1 000 psi and below see DHI s PPCK pressure controller calibrator PPCK measures pressure using a high precision reference pressure transducer RPT and an on board barometer Pressure control is achieved by pneumatically actuated high pressure valves and a patented thermal pressure control TPC system for very fine ad
149. pen to atmospheric pressure and the rate of change of pressure has reached the current stability limit The current displayed pressure should be used as the measured value of pressure applied to the device or system under test Page 44 PPCK Operation and Maintenance Manual DHI 32 11 Q AND J OG PRESSURE SET POINT PURPOSE To jog the pressure target value in small increments around the set point wl See Section 3 2 10 for information on setting pressure automatically PRINCIPLE PPCK sets and adjusts pressure automatically to a user designated target value In some cases it can be useful to slightly adjust the target value for example to set the DUT to read a specific value as commonly done when verifying or calibrating an analog gauge The PPCK jog function makes it easy to adjust the target pressure slightly Pressing the lt and gt keys of the 4 x 4 keypad while controlling pressure in the main run screen or when displaying the target pressure in the set pressure screen causes the target value to increase or decrease by the amount of the current hold limit see Section 3 2 3 For information on setting pressure automatically with PPCK see Sections 3 2 10 3 1 2 3 5 1 2 4 OPERATION The target pressure value can be jogged e In dynamic control mode while controlling pressure in the main run screen e In dynamic control mode in the set target screen To jog the target pressure value press
150. ply 20 The QYE and EXE bits are set IDN Purpose Identify the PPCK version range and serial number Query IDN Remarks The identification reply is made up of the manufacture the model the serial number and the software version Each is separated by a comma Example Sent IDN enhanced Reply DH INSTRUMENTS INC PPCK A0100 A0015 1234 Ver1 00 dhf 2001 DH Instruments Inc Page 112 PPCK Operation and Maintenance Manual DHI e OPC Purpose Sets the operation complete bit when all operations have completed Command OPC Query OPC Remarks This Command enables the PPCK 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 enhanced Query reply 1 OPT Purpose Reads the list of installed PPCK options Query OPT Remarks This Query returns any registered option s installed in the PPCK Each option is separated by a comma Possible options IEEE 488 0 The IEEE 488 option is installed ANALOG n The analog option is installed n is the revision on the analog option hardware from A to Z or if original revision Example Sent OPT enhanced Reply IEEE 488 0 ANALOG
151. pressure and use only the fast speed to reach the target PSH Obsolete PPC2 Command PSS Set a new target pressure and use only the slow speed to reach the target QPRR Read the last PPCK RPT pressure rate and ATM RANGE Read or set the active range of the PPCK RANGEHI Read values of all three PPCK ranges RATES Read or set the rates that define the manual or remote fast and slow rates RATE Read the next available rate of change of pressure READY Obsolete PPC2 Command READYCK Read or set a flag that is cleared by a Not Ready condition REMOTE Enable remote local lockout operation RES Read or set the pressure display resolution for the current RPT and range RESET Reset the PPCK to the default user parameters RETURN Start a new automated pressure control set using the current target value RPMS Obsolete PPC2 command RS Start a fixed rate generation at the rate specified SCRSAV Read or set the front panel screen saver period SETS Specify default or custom generation settings SN Read the serial number of the PPCK SR Read the next available pressure status SS Read or set the stability required for a Ready condition SS Read or set the stability required for a Ready condition in FS s STAT Read the pressure generation status TIME Read or set the current time of day TOUT Obsolete PPC2 Command TP Read the current target pressure TS Obsolete PPC2 Command UCOEF Convert a pressure in Pascal to pressure in the c
152. rational adjustments are specific to the range currently in use as if you had three instruments rather than one Ranges And Identification The active reference transducer and range is continuously displayed in the upper right hand corner of the main run screen and most other screens See Table 1 for a complete listing of the RPTs available and their ranges Hi RPT The RPT in a PPCK is referred to as the Hi RPT Range 1 2 or 3 The three ranges of the RPT are referred to as 1 lo range 2 mid range 3 hi range Table 5 PPCK Range Identification Summary REFERENCE PRESSURE TRANSDUCER AND RANGE DESIGNATION DISPLAY SYMBOL Hi RPT Lo range Hi RPT Mid range HI RPT Hi range The display symbol is included in the upper right hand corner of most PPCK menu displays as a convenient indicator of active range Page 27 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 3127 DIRECT FUNCTION KEYS SUMVARY Local operation of PPCK is through the 4 x 4 pressure sensitive keypad To minimize the use of multi layered menu structure the 4 x 4 keypad numerical keys also provide direct access to the most commonly used functions The function accessed is labeled on the bottom half of the key Direct function keys are active whenever PPCK is in its main run screen Table 6 summarizes the operation of the direct function keys w i Table 6 provides a brief summary of direct function key operation It m
153. re just after the RPT has been calibrated This is referred to as the natural error at the autozero pressure Because no RPT is perfectly linear and ZSTD is not perfectly accurate the disagreement between the RPT reading and ZSTD at the autozero pressure is unlikely to ever be zero 4 ZOFFSET ZCURERR corrected for ZNATERR represents the drift of the RPT relative to the reference ZOFFSET ZCURERR ZNATERR The current RPT reading adjusted by ZOFFSET is the autozeroed RPT reading e g the RPT reading corrected for zero drift since it was calibrated In gauge mode ZOFFSET also includes the value of atmospheric pressure that is being subtracted to arrive at gauge pressure The AutoZ function manages the determination storage and application of ZNATERR and ZOFFSET individually for each PPCK range and measurement mode AutoZ ON OFF The AutoZ function can be turned ON and OFF When AutoZ is ON the ZOFFSET is always applied to the pressure measured by PPCK When AutoZ is OFF ZOFFSET is not applied except for an absolute RPT in gauge mode for which ZOFFSET is the current value of atmospheric pressure which is always subtracted to achieve gauge pressure 2001 DH Instruments Inc Page 48 PPCK Operation and Maintenance Manual DHI Gauge Mode Dynamic Compensation For Atmospheric Pressure PPCK allows gauge pressure measurements with an absolute RPT by calculation subtracting the value of atmosphere tare from the RPT s a
154. re measurements see Section 3 4 1 PRINCIPLE F the on board barometer is a low accuracy sensor used only for measuring changes in atmospheric pressure over short periods of time see Section 3 4 1 PRINCIPLE PPCK measurement uncertainty does not depend on the absolute uncertainty of the on board barometer Page 66 PPCK Operation and Maintenance Manual DHi 3449 OPERATION To view the current reading of the on board barometer press SPECIAL and select lt 4Internal gt lt 7Atm gt The display is in the pressure units of the current PPCK range SCRSAV PURPOSE To adjust the PPCK screen saver function PRINCIPLE PPCK has a screen saver function which causes the display to dim after a front panel key is not pressed for a certain amount of time This function is factory set to activate after 10 minutes of inactivity but can be adjusted by the user OPERATION To access the screen saver function press SPECIAL and select lt 4Internal gt lt 8ScrSav gt Edit the screen saver on time in minutes as desired weil Setting screen saver time to zero eliminates the screen saver function so that the display will permanently remain at full brightness LOG PURPOSE To view and or clear the PPCK event log PRINCIPLE PPCK records to a log each time one of the following events occurs e The RPT is overpressure e Amemory fault occurs OPERATION To view the event log press SPECIAL and select lt 4Internal
155. redominates DH Instruments DH DHI AutoZ PPC PPC2 PPCK Thermal Pressure Control TPC and AutoZ are trademarks registered and otherwise of DH Instruments Inc 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 Document No 550118a 01 20011213 Printed in the USA 2001 DH Instruments Inc PPCK Operation and Maintenance Manual TABLE OF CONTENTS TABLE OF CONTENT S preoer onai ee Eor aan EON d arara i TABLES EE iv FIGURES TTT v ABOUT THIS MANUAL ET vi T INTRODUCTION EE 1 1 1 PRODUCT ge VE VII 1 1 2 SPECIFICATIONS sscssssstcssssscsencssnesnsssssenssssscusssenecenaesseusnseanssacseasssnssasacanseesteanssanesnncensasansansonssaaesaonranarassad 2 1 24 GENERAL SPECIFICATIONS io eessen 2 1 2 2 PRESSURE MEASUREMENT SPECIFICATIONS een 2 1 2 2 1 REFERENCE PRESSURE TRANSDUCER RPT GPECIEICATIONS cece ete eeeeeei 3 1 2 2 2 ON BOARD BAROMETER A 4 1 2 3 PRESSURE CONTROL SPECIFICATIONS cccccsssssssssseseseessesseseeseeseeseseseesesaesaesaesaeseesevsesesaesessenansaesnnaneas 4 INSTALLATION BEE 7 2 1 UNPACKING AND INSPECTION cscetsccecccscccsotcesetecteiccncecesstcececcevicdecestshanecsoedes dlieesadedescecccarssuersnceeedtereaeeesse 7 2 1 1 REMOVING FROM PACKAGING ccccsssssssssssesessessessesseseesessesseseeseesevaesaesaese
156. ressed again another manual pressure control key is pressed or an automated pressure control command is given Pressing T or Hl causes pressure to increase or decrease at the slow slew rate These are momentary keys that are active only as long as they are pressed Releasing the key stops the pressure increase or decrease Pressing and holding the FAST key while pressing the or HI causes the pressure increase or decrease speed to change from slow to fast sr 4 4 er Figure 4 Manual Pressure Control Keys Page 19 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 3123 PRESSURE CONTROL OPERATING PRINCIPLES Numerical references in this section refer to Figure 5 PPCK is designed to precisely measures and control gas pressures into a volume connected to its TEST port 14 Pressure is measured by a Reference Pressure Transducer RPT 17 Pressure is controlled in two stages The first stage of pressure control is valve control Valve control is used for all aspects of pressure control except the final stage of dynamic pressure control in which pressure is maintained at the target value see Section 3 1 2 4 Valve control is accomplished by high pressure inlet and exhaust valves 3 11 The HP inlet valve 3 controls the admission of pressure from the SUPPLY port 1 The HP exhaust valve 11 controls the exhaust of pressure out of the VENT port 13 The HP inlet and HP exhau
157. ressure supply to the DRIVE IN port that is greater than 1 MPa 150 psi Damage to PPCK could result 23 7 DRIVE OUT PORT The DRIVE OUT port is the exhaust point for drive air used by PPCK s high pressure valve drive system see Figure 5 The DRIVE OUT port should be open to atmosphere and unobstructed to allow drive air to escape The drive air consumption is very low so there is no significant flow through the DRIVE OUT port Though a pressure hose can be connected to the DRIVE OUT port to direct the exhausted gas flow the flow is very low and a completely unobstructed connection to atmosphere must be maintained The PPCK DRIVE OUT port is 1 8 in NPT female NEVER plug obstruct or connect a supply pressure to the DRIVE OUT port 2001 DH Instruments Inc Page 12 PPCK Operation and Maintenance Manual DHI 238 VENTPORT The PPCK VENT port is the test exhaust port as well as the vent to atmosphere point used to set zero gauge pressure Though a pressure hose can be connected to the VENT port to direct the vented gas flow a completely unobstructed connection to atmosphere must be maintained for PPCK reference pressure measurements to operate normally The PPCK VENT port is 1 8 in NPT female Ei NEVER plug obstruct or connect a supply pressure to the PPCK VENT port 239 THE DRAINPORT The DRAIN port connects to the low point in the PPCK thermal pressure control volume see Figures 2 12 The volume serves as
158. rmat is recommended when possible as the classic format is obsolete Selection can be accomplished from the front panel see Section 3 4 4 3 or remotely by using the MSGFMT program message The default is the classic program message format to allow downward compatibility with existing host software The basic commands are similar for both the classic and enhanced formats but the usage syntax format and status reporting are different The PPCK enhanced program message format also includes additional common program messages that are required in every device that complies with the IEEE Std 488 2 These addition common program messages are covered separately in Section 4 6 1 43 1 CLASSIC PROGRAMIMESSAGE FORMAT The classic program message format is downward compatible with the previous PPCK program message set However several PPCK functions are not supported by PPCK and neither are their corresponding commands see CFG DEVICE DPG ISO PPC HOLD TOUT TS CONFIG This format is recommended only if you need downward compatibility with older PPCK controllers Each program message sent is also a query You can only send one program message to the PPCK at time After sending any program message you must wait for the PPCK to reply before sending another program message This reply will contain data or a numeric error message if the program message was invalid You must wait for this reply before issuing another program message to the PPCK
159. rmation for the specified RPT always HI in PPCK and RPT range 1 2 or 3 can be accessed with this program message Using this program message will overwrite the current calibration coefficients so caution must be used Changes made using this program message will take affect immediately Example Cmd sent PCAL1 HI 2 1 1 000021 961201 enhanced Query reply 2 10 Paa 1 000021 961201 Example Sent PCAL1 Hl 2 1 1 000021 961201 classic Reply 2 10 Paa 1 000021 961201 Errors ERR 6 One of the arguments is out of range See Also 5 2 CAL PR Purpose Read the next available pressure Query PR Classic PR Remarks The next available pressure value for the active RPT and range is read in the current pressure units The data returned also contains Ready information and the pressure units The reply field is always 20 characters long The first 3 characters of the reply are reserved for the Ready status R NR ER OL or OP The Ready status is detailed in the SR program message The pressure measurement value and pressure units are right justified in this field After receiving this program message the PPCK will reply back with the data once a new pressure measurement cycle is complete This can take up to 1 5 seconds Example Query sent PR enhanced Query reply R 1936 72 kPaa Example Query sent PR classic Reply R 1936 72 kPaa See Also 3 1 2
160. rrent value of ZOFFSET sc el Z0rFSET should be zero when the PPCK is new or has just been calibrated ZOFFSET in absolute mode should be roughly equal to atmospheric pressure for an absolute RPT operating in gauge mode F The value of ZOFFSET is always displayed and entered in Pascal Pa as PPCK s internal operations are in Pa 2001 DH Instruments Inc Page 50 PPCK Operation and Maintenance Manual DHI 3412 EDITAUTOZ me edit AutoZ function should be used with great caution as entering inappropriate values and turning ON AutoZ may result in incorrect autozeroing and out of tolerance measurements In normal operation the value of ZOFFSET should be changed using the run AutoZ function seen Section 3 4 1 5 The only expected use of edit AutoZ is to set ZOFFSET to zero after a calibration of PPCK RPTs Before editing ZOFFSET see Sections 3 4 1 PRINCIPLE and 5 2 6 To edit the current ZOFFSET for the current range and measurement mode press SPECIAL and select lt 1AutoZ gt lt 3edit gt The display is SCH ZOFFSET absolute H3 0 0 Pa acl 1 Current measurement mode 2 Current range 3 Edit field for value of ZOFFSET wl The value of ZOFFSET is always displayed and entered in Pascal Pa 3413 RUNAUTOZ Run AutoZ is the function by which the current RPT reading is compared to ZSTD and a new value of ZOFFSET representing RPT zero drift is determined see Section 3 4 1 PRINCIPLE How AutoZ Wor
161. ruments Inc H PPCK Operation and Maintenance Manual of Minimizing the length and complexity of the test connection tubing enhances control performance and reduces pressure setting time For optimum operation the total volume of the device or system under test including connecting tubing should be less than 500 cc 30 in up to 200 MPa 3 OOO psi and less than 200 cc 12 in over 200 MPa 3 000 psi Geck pressure control will not operate properly if there are excessive leaks in the test system As a general rule the maximum acceptable leak rate for optimal PPCK automated pressure control operation and to assure in tolerance measurements with default pressure control parameters is 0 01 of active range FS second If working with larger leaks is unavoidable consider using STATIC CONTROL mode see Section 3 1 2 4 23 66 CONNECTING THE DRIVE PRESSURE SUPPLY DRIVE IN PORT PPCK s high pressure valves are actuated by a drive pressure This drive pressure must be connected and properly set for PPCK to operate properly Using a pressure connecting hose of appropriate pressure rating connect the drive pressure supply to the DRIVE IN connection on the rear panel of PPCK The DRIVE IN connection is 1 8 in NPT F The drive pressure must be between 700 850 kPa 100 120 psi The supply pressure must be stable 5 for PPCK pressure control to operate within specifications see Section 1 2 3 Never connect a p
162. ry in each program message summary in Section 4 4 4 2001 DH Instruments Inc Page 72 PPCK Operation and Maintenance Manual DHI 4 4 COMMANDS 44 1 PROGRAMMESSAGES Shown are the basic program messages for the classic and the enhanced formats There are also additional IEEE Std 488 2 common commands they start with an that are common in all IEEE 488 2 compatible devices These commands and the enhanced format status reporting model are covered in Sections 4 5 and 4 6 Table 12 Program Message List Send a command string out of the PPCK COM2 port ABORT Stop pressure generation AINCAL Obsolete PPC2 command not supported by PPCK AINR Obsolete PPC2 command not supported by PPCK AINRNG Obsolete PPC2 command not supported by PPCK ATM Read the current atmospheric pressure on board barometer AUTOPURGE Command for PPC2 feature not supported by PPCK AUTOVAC Command for PPC2 feature not supported by PPCK AUTOZERO Read or set the status of the automatic zero function CALAMB Read or set the PPCK ambient sensor user calibration COM1 Read or set the configuration of the COM1 port COM2 Read or set the configuration of the COM2 port CONFIG Run a TPC configuration routine DATE Read or set the current date DEVICE Obsolete PPC2 Command DF Decrease the pressure quickly DP Decrease t
163. s checked If this memory is corrupted all user settings are reset to default as if the RESET program message was executed and the MEM status will be set to reflect this Example Query sent MEM enhanced Reply 0 PPCK data corrupted and was set to factory defaults 1 The memory was found to be OK on power up Example Sent MEM classic Reply MEM 0 PPCK data corrupted and was set to factory defaults MEM 1 The memory was found to be OK on power up See Also 3 4 4 5 RESET 2001 DH Instruments Inc Page 86 PPCK Operation and Maintenance Manual e MODE Purpose Read or set the control mode Command MODE n Query MODE Classic MODE n MODE Arguments n 0 for static pressure control 1 for dynamic pressure control Remarks The method which the PPCK 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 mode setting is range dependent Example Cmd sent MODE 1 enhanced Query reply 1 Example Sent MODE 1 classic Reply MODE 1 Errors ERR 6 The argument is invalid See Also 3 1 2 4 3 2 3 3 2 6 MSGFMT Purpose Read or set the type of program message format to use Command MSGFMT n Query MSGFMT Classic MSGFMT n
164. s when automated pressure control is ON lt D gt for dynamic control lt S gt for static control with lt C gt added if custom control parameters are in use lt VLV gt when opening a control valve see Sections 3 2 3 3 1 2 3 lt T gt target pressure value when controlling and in Not Ready condition lt R gt pressure rate of change when in static control inside the hold limit lt D gt deviation from the target value when in dynamic control mode and in Ready condition Observe the Ready Not Ready indication to determine when Ready conditions have been satisfied see Section 3 1 2 5 PPCK will continue controlling following static or dynamic control operation protocol see Section 3 1 2 4 until automated pressure control is interrupted Automated pressure control is interrupted by Pressing ESCAPE Suspends control and remains in main run screen Pressing any manual pressure control key see Section 3 1 2 2 Suspends control and executes direct pressure control Pressing any function key Suspends control and goes to the selected function Pressing ENTER SET P Suspends control and goes to ENTER target pressure value screen To resume automated pressure control press SET P and ENTER a target pressure value wi Pressure control status is indicated by the pressure control characters of the main run screen These are located in the middle of the bottom line of the display The control character indicatio
165. sed in normal operation be recorded for each range prior to running the calibration The current PA and PM can be viewed by pressing SPECIAL and selecting lt 4Internal gt lt 2Cal gt lt 1View gt ZOFFSET s current value can be viewed by pressing SPECIAL and selecting lt 1AutoZ gt lt 2view gt 2001 DH Instruments Inc Page 118 PPCK Operation and Maintenance Manual DHI 522 EQUIPMENT REQUIRED The following specific items in addition to a normally equipped pressure calibration laboratory are required to calibrate a PPCK 1 Gas operated piston gauge deadweight tester with the following characteristics e Measurement uncertainty of 0 005 of reading or better if best PPCK measurement uncertainty is to be obtained A standard with higher measurement uncertainty may be used but PPCK measurement uncertainty will be degraded proportionally from published specifications e Able to apply absolute pressures if the RPT will be used in the absolute measure mode Absolute pressures in the range of PPCK are usually defined by applying gauge relative pressures with a piston gauge and adding atmospheric pressure measured by a precision barometer If the PPCK RPT will not be used in absolute measure mode as is often the case for high pressure RPTs absolute pressures are not required for calibration and the calibration may be performed by applying gauge pressures only A the measurement uncertainty in absolut
166. seeeseeeneeeas 14 24 1 SWITCH POWER ON ecscstesseessesseesesseseesessesaesaeseeseesessesaeseeseesesaesausaeseesevseuaesaeseesesaesaesaesaesesaeseuseuaevassaeeaeas 14 2 4 2 CHECK PROPER PRESSURE MEASUREMENT OPERATION cscscs00 we l4 2 4 2 1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT wi l4 2 4 2 2 CHECKING GAUGE MODE PRESSURE MEASUREMENT SEA 2 4 3 ele weld 2 4 4 CHECK PROPER PRESSURE CONTROL OPERATION wed 2 5 SHORT TERM STORAGE ocr co csecds scat ta sec cecececcsestans cou cecdeecardtecscenesetwecneresscesecarcuucizscevcsniecshesesedeetzecussursenie 15 Page i 2001 DH Instruments Inc Du PPCK Operation and Maintenance Manual 3 OPERATION giereg See He a ae Pe Baie de eee 17 3 1 GENERAL MANUAL OPERATION EEN 17 3 1 1 MAIN RUN SCHEER 17 3 1 2 GENERAL OPERATING PRINCIPLES 2 lf 3 1 2 1 KEYPAD LAYOUT AND PROTOCOL Se 18 3 1 2 2 MANUAL PRESSURE CONTROL KEYS 0 1 ks E 3 1 2 3 PRESSURE CONTROL OPERATING PRINCIPLES 20 3 1 2 4 AUTOMATED PRESSURE CONTROL MODES Se te 3 1 2 5 PRESSURE READY NOT BEafnr e See 3 1 2 6 MULTIPLE PRESSURE DANGES Si e GE 3 1 2 7 DIRECT FUNCTION KEYS SUMMARY ssssssssssesssssssessssssessssssesssssesesssssvessssssessssusesssstesessseessesss 28 3 2 DIRECT FUNCTION KEY SEENEN 28 E D TRANG EE 28 3 2 1 1 RANGE SPECIFIC FUNCTIONS AND SETTINGS 20 EE TEE EE EE 31 823 ERNEIEREN 32 3 2 3 1 S
167. ssure inlet and exhaust valves see Figures 11 12 These valves are used for precise high pressure control They are dome loaded needed valves The actuating pressure on the dome is controlled by the low pressure pneumatic module see Section 5 6 1 2001 DH Instruments Inc Page 126 PPCK Operation and Maintenance Manual SUPPLY Port DH200 F HP Inlet Valve Dome Exhaust Valve High Pressure Inlet Valve HP Inlet Valve Dome Supply Valves Drive Air Lines DRIVE IN Port 1 8 in NPT F Drive Air Filter Drive Air Regulator factory adj DRIVE OUT Port 1 8 in NPT F COONDARWNY gt 10 HP Exhaust Valve Dome Exhaust Valves 11 12 13 14 15 16 17 18 19 High Pressure Exhaust Valve HP Exhaust Valve Dome Exhaust Valve VENT Port 1 8 in NPT F TEST Port DH200 F DRAIN Port DH200 F Thermal Pressure Control Unit TPCU Reference Pressure Transducer RPT High Pressure Filter s High Pressure Lines Note The low pressure pneumatic module is made up of references 2 4 5 6 7 8 9 10 12 Figure 12 Pneumatic Module High and Low 563 DRM R BOARD The driver board is controlled by the micro card see Section 5 6 6 It supports the 12 V drivers for the internal and external solenoid valve actuation an
168. st valves are dome loaded needle valves The valve is normally closed by a Belleville spring The valve is opened and its needle position is controlled by the application of drive pressure onto the dome in opposing force to the Belleville spring The drive pressure is supplied from the DRIVE IN port 6 and controlled by the drive air solenoid valves 2 4 10 12 When a command is given to set a pressure the high pressure inlet 3 or exhaust 11 valve must be opened to admit or exhaust pressure The opening procedure takes 5 to 10 seconds during which PPCK may appear to be idle To notify the operator that the valve opening procedure is in process the main run screen pressure control characters FLASH lt VLV gt during the valve opening routine see Section 3 1 1 The second stage of pressure control is thermal pressure control TPC TPC is used in the final stage of dynamic pressure control when very fine control is needed to maintain pressure at the target value see Section 3 1 2 4 TPC uses a pressurized volume in which there is a heating element and around which there is a forced air cooling system 16 Heating and cooling the gas in the volume causes it to expand or contract increasing or decreasing pressure This patented pressure control system allows extremely fine pressure control without hysteresis or wear of mechanical parts The TPC system response is dependent on the volume connected to the TEST port Whenever TPC respons
169. t Functions and settings that are NOT range specific are e Functions HEAD e Setup Menu lt 2Drivers gt 2001 DH Instruments Inc Page 30 PPCK Operation and Maintenance Manual DHI 322 Q UNT PURPOSE To specify the pressure unit of measure and measurement mode in which PPCK displays pressure values See also Section 3 4 3 PRINCIPLE PPCK allows the pressure measurement unit and mode to be changed Internally PPCK always operates in Pascal Pa the SI unit of pressure Values of pressure are represented in other units by the application of conversion factors to convert from Pa see Section 7 2 1 PPCK RPTs intrinsically measure absolute pressure relative to an evacuated and sealed reference They are also used to measure in gauge mode by the subtraction of atmospheric pressure PPCK supports extensive on board logic and measurements to assure the precise atmospheric compensation of absolute RPTs to deliver achieve gauge pressure see Section 3 4 1 Gauge Mode Dynamic Compensation For Atmospheric Pressure This allows simple one step switching between gauge and absolute measurement modes by the operator without special procedures or hardware OPERATION To change the pressure unit and or the Measurement H1 measurement mode press the UNIT function key unit 2mode The display is Select lt 1unit gt to change pressure units or lt 2mode gt to change measurement mode If lt 2mode gt is se
170. t hand threaded 1 4 in 6 mm OD tube equivalent to AE SF250C HIP LF4 etc Maximum Working Pressure Maximum Pressure without Damage Range H3 20 Maximum Working Supply Pressure Range H3 10 Maximum Supply Pressure without Damage Range H3 20 Range H3 10 PRESSURE MEASUREMENT SPECIICATIONS Each PPCK has three ranges using one Reference Pressure Transducers RPT and a barometer All three ranges operate in both gauge and absolute mode All RPTs are of the absolute pressure sealed reference type using an evacuated permanently Gauge pressures are defined by offsetting atmospheric pressure with dynamic compensation for atmospheric changes using the on board barometer see Section 3 4 1 Gauge Mode Dynamic Compensation for Atmospheric Pressure 2001 DH Instruments Inc Page 2 PPCK Operation and Maintenance Manual DHI Table 1 Model Designations and Ranges RPT US UNITS VERSION psi SI UNITS VERSION MPa DESIGNATION RANGE1 LO RANGE2 MID RANGES HI RANGE1 LO RANGE2 MID RANGES HI A10000 3 000 6 000 10 000 20 40 70 A6000 2 000 4 000 6 000 13 25 40 A3000 1 000 2 000 3 000 6 12 20 Note All ranges are both absolute and gauge and support all measurement units available The US or SI distinction only affects the nominal range values and settings 1221 REFERENCE PRESSURE TRANSDUCER RPT SPECIFICATIONS wel All
171. tandard The transducer readings are adjusted by user settable coefficients PA an adder or offset and PM a multiplier or span set see Section 5 2 1 1 The calibration process is performed independently on each RPT range to arrive at the optimal fit for each range This technique allows reduced measurement uncertainty for individual ranges lower than the RPT s maximum range by taking into account specific transducer performance characteristics in particular localized non linearity and excursion dependent hysteresis Independent range calibration also makes it possible to calibrate only certain ranges if ranges are on different calibration intervals or not all ranges are needed The normal calibration process has a second step which is the determination of the value of ZNATERR see Section 5 2 1 2 This added step is necessary to get the full benefit of the autozero function between calibrations see Section 3 4 1 if the RPT will be operated in absolute measure mode calTool for RPTs software provided with the PPCK supports the calibration process of PPCK RPTs CalTool and its documentation is provided on a General Accessories Disk with the new PPCK accessories Most users should use CalTool software to assist in the calibration of PPCK PPCK is delivered with an interactive reference pressure transducer calibration utility that steps the operator through the complete RPT calibration procedure including applying the necessary press
172. the user to use one Host COM port to communicate with the PPCK and an additional RS232 device Refer to the PASSTHRU remote program message for details COM2 is a 9 pin male DB 9M connector configured as a DTE device Data is transmitted out of the unit using pin 3 and is received on pin 2 This allows a normal pin to pin DB 9M to DB 9F RS232 cable to be used to connect to a DCE device Handshaking is not required or supported Table 11 List of PPCK COM2 DB 9M Pin Designations PIN FUNCTION DESCRIPTION 3 DD This pin transmits serial data from the PPCK to a device 2 RD This pin accepts serial data from the external device 5 om This pin is the common return for the TxD and RxD signals 4 DR This pin is Data Terminal Ready DTR held at 5 V 2001 DH Instruments Inc Page 70 PPCK Operation and Maintenance Manual DHI 4 3 PROGRAMMING FORMATS The PPCK program message set is downward compatible with the previous PPCK program message set It is identical to the PPC2 program message set with the exception of a few commands that are not included for PPCK because they support PPC2 functions that PPCK does not include This message set includes an enhanced program message format to support IEEE Std 488 2 syntax format and status reporting The user must select whether to use either the original classic program message format or the new enhanced program message format The enhanced fo
173. tiplier Defaults CAL 0 000 psi 1 0000000 Remarks The user RPT calibration can be used to allow the user to calibrate the PPCK s internal RPT pressure calibration for the currently active range This command has been superceded by the PCAL command and should not be used for new applications Example Cmd sent CAL 2 1 1 00012 enhanced Query reply 2 11 psi 1 000120 Example Sent CAL 2 1 1 00012 classic Reply 2 11 psi 1 000120 Errors ERR 7 Missing or improper program message argument s See Also 3 4 4 2 PCAL Page 79 2001 DH Instruments Inc PPCK Operation and Maintenance Manual COM1 Purpose Read or set the RS232 settings for the COM1 port Command COM1 baud parity data stop Query COM1 Classic COM1 baud parity data stop COM1 Arguments baud The baud rate This may be 300 600 1200 2400 4800 9600 or 19200 parity The data parity This may be O for odd E for even or N for none data The number of data bits This may be 7 or 8 stop The number of stop bits This may be 1 or 0 Defaults COM1 2400 E 7 1 Remarks The COM1 port is used to communicate to the PPCK When the COM1 port configuration of the PPCK is changed the program message reply COM1 use only wil
174. to stabilize at atmospheric pressure and ambient temperature for 5 to 10 minutes before running AutoZ in gauge measurement mode Page 49 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual O OPERATION wl The AutoZ function and values are range AND mode gauge or absolute specific To access the PPCK AutoZ function press SPECIAL and select lt 1AutoZ gt The display is loff 2view 3edit 4run Selecting lt 1off gt or lt 1on gt is for changing the AutoZ status for the current range and measurement mode from ON to OFF or vice versa Selecting lt 1off gt turns OFF the AutoZ function for the current range and mode see AutoZ ON OFF of this Section wl AutoZ ON is indicated by a lt z gt in the main run screen top line third character from the right When AutoZ is OFF the character is blank Selecting lt 2view gt allows the current value of ZOFFSET for the current range and mode to be viewed Selecting lt 3edit gt allows the value of ZOFFSET for the current range and measurement mode to be edited Selecting lt 4run gt allows the routine for determination and activation of ZOFFSET by measurement of ZSTD to be executed 3411 WEWAUTOZ To view the current ZOFFSET for the current range and measurement mode press SPECIAL and select lt 1AutoZ gt lt 2view gt The display is 1 2 E 1 Current measurement mode ZOFFSET absolute H3 2 Current range 0 0 Pa 3 Display field of cu
175. uments Inc Page 38 PPCK Operation and Maintenance Manual DHI 328 of The reference height of the PPCK pressure Entering a value of zero turns the HEAD function OFF Entering a value other than zero turns the HEAD function ON using the height entered Pressing ESCAPE returns to the main run screen with no change to the current head setting The HEAD function is NOT range specific The HEAD setting remains the same as ranges are changed Edits made to the head specifications are independent of range When the HEAD function is ON head height not O the ON condition is indicated by an lt h gt in the top line right side of the main run screen see Section 3 1 1 When the HEAD function is OFF head height O the lt h gt is not shown of To change units of head height between inches and centimeters and to change the test gas species press SPECIAL and select lt 2Head gt see Section 3 4 2 measurement is the middle of the PPCK TEST port Reference The head height should be entered as a positive value Heim Level if the device or system under test is higher than the meer pOr PPCK and negative if it is lower LEAK CHECK PURPOSE To run an automated leak check routine using PPCK s measurement capability to measure the total pressure change and average rate of change over a period of time to edit the leak check time PRINCIPLE The Leak Check function is provided to assist in using PPCK t
176. ures to each range collecting data automatically calculating new PA and PM values previewing the results of the new calibration determining ZNATERR and activating the results of the new calibration see the CalTool for RPTs manual on the General Accessories Disk PPCK also provides complete front panel and remote access to RPT calibration parameters so that RPT calibrations can be performed without using CalTool software if desired see Section 5 2 7 2001 DH Instruments Inc Page 116 PPCK Operation and Maintenance Manual DHI 5211 PAANDPMCOEFACIENTS The coefficients used to adjust RPT readings are designated PA an adder or offset and PM a multiplier or span set The coefficients affect the RPT reading following Corrected reading uncorrected reading PM PA PA is expressed in units of pressure always the SI unit Pascal PM is dimensionless There are individual PA and PM values for each of PPCK s three ranges The values of PA and PM currently in use can be viewed using the CAL function see Section 5 2 5 PA and PM values are automatically edited when CalTool software is used and the results are activated PA and PM values can also be edited manually under the CAL function see Section 5 2 5 As editing PA and PM values will change RPT calibration these should only be edited by qualified personnel as part of the calibration process Caution should be taken to avoid accidental editing see Section 3 4 4 6
177. urrent units UDD Obsolete PPC command UDU Read or set the user defined pressure unit UL Read or set the upper limit for the current range UNIT Read or set the pressure unit of measure for the current range VAC Command for PPC2 feature not supported by PPCK VENT Read execute or abort a vent process VER Read the PPCK software version ZNATERRd HI Read or set the autozero natural error for Hi RPT ZNATERRd LO Read or set the autozero natural error for Lo RPT PPCK has no Lo RPT ZOFFSETd HI Read or set the autozero offset for Hi RPT ZOFFSETd LO Read or set the autozero offset for Lo RPT PPCK has no Lo RPT 2001 DH Instruments Inc Page 74 PPCK Operation and Maintenance Manual DHI 442 ERRORMESSAGES The PPCK always replies to a program message while using the classic format If the program message is incorrect or contains invalid data an error number will be returned in the form lt ERR n gt where n is an integer number that represents a specific error This allows for easy error trapping by the host computer In the enhanced format each error is placed into the Error Queue as it occurs The lt ERR gt query can then be used to remove from the queue and reply the text description of each error that has occurred If you are using the COM1 port the Error Queue is cleared each time a program message except lt ERR gt is received Section 4 5 1 explains the details of the Error Queue Her
178. vely unstable Thermal Pressure Control TPC has incorrectly calculated test volume Control mode is set to static rather than dynamic Behavior is normal Control mode is set to static rather than dynamic or control is not active Behavior is normal Pressure setting commands for zero absolute are interpreted as a VENT command because PPCK cannot set pressures under atmosphere There is a restriction in the test connection between the PPCK and the test Page 131 regulate pressure supply install a pressure accumulator if the action of a booster is causing the pressure supply to fluctuate excessively 2 3 4 Run Config routine 5 5 3 1 2 3 Use CONTROL to set control mode to dynamic 3 1 2 3 3 2 3 Use CONTROL to set control mode to dynamic use ENTER SET P to active pressure control 3 1 2 3 3 2 3 3 2 10 Operation is normal 3 2 10 1 Remove the restriction to allow free flow between the PPCK and the test 2001 DH Instruments Inc PPCK Operation and Maintenance Manual Table 18 Troubleshooting Guide Continued SYMPTOM POSSIBLE CAUSE SOLUTION Poor pressure control characterized by excessive overshooting and or undershooting inability to lock on target unstable readings Poor pressure control characterized by excessive pressure noise at control point and or hunting around target Poor pressure control characterized by very slow slew rate and or time to Rea
179. ween the reading of the on board barometer at the last tare and the current reading of the on board barometer Used to dynamically compensate the atmospheric offset ZOFFSET when operating in gauge measurement and mode with an absolute RPT and AutoZ ON Autozero A process by which an RPT range and measurement mode is rezeroed offset relative to a standard Barometer PPCK s on board atmospheric pressure measuring sensor Also referred to as on board barometer Control Mode The type of pressure control that is active static or dynamic pressure control Control Parameter Parameters affecting pressure control and the Ready Not Ready determination target hold limit stability limit Custom Control Automated pressure control in which the control parameters are not the default control parameters Deviation The deviation of the current pressure from the target pressure control value Indicated in main run screen when in dynamic control mode Pneumatic power used to actuate PPCK s high pressure valves Device Under Test The device or devices pneumatically connected to the PPCK TEST port that the PPCK is being used to test or calibrate Dynamic Control Control mode in which the pressure is constantly adjusted to remain as close as possible to the target value Abbreviation of full scale The full scale value is the maximum pressure or the span of a measurement range Limits and specifications are often expressed as FS G
180. ximum range of the RPT in psi e g A0100 SPLT Self Purging Liquid Trap An optional device to protect PPCK from liquid and particulate contamination returned from a DUT Stability Limit A limit expressed in units of pressure per second e g psi second The stability limit is used as the Ready Not Ready criterion Ready if inside stability limit Not Ready if stability limit is exceeded Static Control Control mode in which the pressure is set near the target value and then shut OFF and allowed to evolve freely Target The value to which automated pressure control attempts to set and maintain the pressure Thermal Pressure Fine pressure adjustment by heating and cooling the pressurized gas using a Control TPC thermal pressure control unit TPCU TPCU Thermal pressure control unit the assembly used for thermal pressure control U Same as Upper Limit Upper Limit A range specific maximum value of pressure not be exceeded and at which PPCK will abort pressure setting and buzz Page 139 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual User Level Levels of security that can be set to protect certain PPCK functions from being accessed ZNATERR The disagreement between the RPT indication and ZSTD at the autozero pressure just after the RPT has been calibrated ZCURERR The disagreement between the RPT indication and ZTSD at some time after the RPT has been calibrated ZOFFSET ZCURERR correcte
181. xt paragraph An active driver is indicated by lt gt immediately following the driver number Pressing ENTER while in the lt External drivers gt menu causes a menu to appear that allows selection of whether the driver actuation will be lt 1momentary gt or lt 2toggle gt 2001 DH Instruments Inc Page 46 PPCK Operation and Maintenance Manual DHI 3 4 SPECIAL MENU KEY The SPECIAL menu key accesses a menu of functions that are less commonly used or not normally used in regular operation Press the SPECIAL menu key to access the SPECIAL menu The display is 1AutoZ 2Head 3PresU 4Internal Press lt 1AutoZ gt to turn AutoZ ON OFF and view AutoZ values see Section 3 4 1 Press lt 2Head gt to set head height units and change the head fluid see Section 3 4 2 Press lt 3PresU gt to customize the choice of pressure units of measure under UNIT see Section 3 4 3 Press lt 4Internal gt to access internal settings and functions RPT calibration remote interface settings time and date resets user levels and screen saver see Sections 3 4 4 1 to 3 4 4 8 341 AUTOZ O PURPOSE To change the offset zero of the reference pressure transducer RPT relative to a reference value in order to compensate for RPT zero drift between full recalibrations to assure operation within with autozero measurement uncertainty specifications see Section 1 2 2 1 it is recommended that AutoZ be run the value of ZOFFSE
182. y and decreasing e lt gt Pressure Not Ready and increasing When pressure control is NOT active A Ready condition occurs any time the pressure rate of change is inside the stability limit The stability limit is defined in terms of rate of change of pressure in current pressure units per second see Section 3 2 6 When pressure control is active The criteria for determining the Ready Not Ready condition depend on whether the current control mode is static or dynamic Pressure Ready Not Ready parameters are set by default when a control mode is selected The parameters can be customized if desired see Sections 3 2 3 and 3 2 6 wl The Ready condition is handled specially when responding to an automated pressure command of zero see Section 3 2 10 1 Page 25 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual Ready Not Ready In Static Control Mode When static pressure control mode is active a Ready condition occurs whenever e The current measured pressure is inside the hold limit e The rate of change of pressure is less than the current stability limit P r e S S u r e Target Pressure Hold Limit Not Ready Ready 1 Not Ready Ready Time Setting pressure l Pressure within petting pressure Pressure within to target hold limit to target hold limit amp stability limit l amp stability limit Figure 8 Ready Not Ready in Static Control Mode Ready Not Ready In Dynamic
183. y downloading or loading software contact your normal DHI representative or a DHI Authorized Service Provider for assistance If the you believe you have discovered an error of bug in PPCK software please report it with complete details by email to dhi dhinstruments com F the DHI flash software loading utility and PPCK embedded software are available for download from the SOFTWARE section of the DHI s world wide web site at www dhinstruments com Page 125 2001 DH Instruments Inc H PPCK Operation and Maintenance Manual 5 6 SUBASSEMBLY DESCRIPTION AND LOCATION 5 P CG CX Biz I EELER TITTI IIIT TIITII LETT ITELILIVLLIILTPLELP ES ET e BR ER o 1 Low Pressure Pneumatic Module 5 On Board Barometer 2 High Pressure Pneumatic Module 6 Micro Card behind Barometer 3 Driver Board 7 Thermal Pressure Control Unit 4 Power Supplies 5V DC 12V DC 8 Reference Pressure Transducer Figure 11 Internal View 561 LOWPRESSURE PNEUMATIC MODULE The low pressure pneumatic module is an integrated assembly that includes six solenoid valves and interconnecting tubing see Figures 11 12 The function of the low pressure pneumatic module is to precisely control the drive air that actuates the high pressure control valves of the high pressure pneumatic module see Section 5 6 2 562 HIGHPRESSURE PNEUMATIC MODULE The high pressure pneumatic module is an integrated assembly that includes the high pre
184. y initially need to be adjusted empirically for correct operation A higher v setting will speed up the generation with a greater chance of control overshoot and a lower v setting will slow down the generation Example Cmd sent PS 1000 enhanced Reply 1000 000 kPa a no reply if IEEE 488 Example Sent PS 1000 classic Reply 1000 000 kPa a Errors ERR 6 The target pressure is out of range See Also 3 1 2 4 3 1 2 5 3 2 3 3 4 4 1 CONFIG MODE PR PRR STAT SR PSF Purpose Set a new target pressure and use just the fast speed to set the pressure Command PSF n Classic PSF n Arguments n The target pressure in the current pressure units Remarks The PPCK will set the given target pressure using just the fast speed and will stop generating when the pressure has reached or passed the given target The system will not attempt to hold the pressure Control stops after the pressure is set The PR PRR STAT or SR program message queries can be used to monitor the progress of the generation Example Cmd sent PSF 1000 enhanced Reply 1000 000 kPaa no reply if IEEE 488 Example Sent PSF 1000 classic Reply 1000 000 kPaa Errors ERR 6 The target pressure is out of range See Also 3 1 2 2 PR PRR STAT SR PSS RATES Page 91 2001 DH Instruments Inc

PPCK+™ High Pressure Controller/Calibrator

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PPCK+&trade; High Pressure Controller/Calibrator

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PPCK+™ High Pressure Controller/Calibrator