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PPC2+™ Operation and Maintenance Manual

©2001 DH Instruments, Inc.

Page 56

3 . 4 S P E C I A L M E N U K E Y

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:

3X::-,1^ROE=:/-3+6GWOX_UOcSXMV_NO]K]OVOM^SYX&@KV`O](=OO^RO::-,1

9ZO\K^SYXKXN7KSX^OXKXMO7KX_KV

3.4.1 AUTOZ

m

PURPOSE

To change the offset (zero) of the Lo and Hi reference pressure transducers relative to a
reference value in order to compensate for RPT zero drift between full recalibrations.

>Y K]]_\O YZO\K^SYX aS^RSX aS^R K_^YdO\Y WOK]_\OWOX^ KMM_\KMc ]ZOMSPSMK^SYX] ]OO

=OM^SYXS^S]\OMYWWOXNON^RK^+_^YDLO\_X^RO`KV_OYPD900=/>_ZNK^ONK^

VOK]^O`O\cNKc]Y\aROX::-RK]LOOXObZY]ON^Y^OWZO\K^_\OMRKXQO]ObMOONSXQ

ÝÙ- Ù0

m

PRINCIPLE

How AutoZ Works

The main component of the change over time of the PPC2+ RPTs is zero drift or offset,
independent of span. Rezeroing PPC2+ RPTs relative to a more stable reference
between recalibrations allows higher measurement accuracy specifications to be
maintained with less frequent full calibrations. The PPC2+ autozero function (AutoZ)
provides full on-board support for the rezeroing process to simplify its application by
the user.

The autozeroing function uses four parameters:

1. ZSTD: The value of the autozero pressure as indicated by the reference

autozero device.

For

absolute RPTs in absolute measurement mode

, the autozero pressure is always

atmospheric pressure and the ZSTD value can be supplied either a) by manual entry;
b)

automatically from a DHI

RPM connected to the PPC2+ COM2 port or;

c) automatically from a Lo absolute RPT if one is available.

For

gauge RPTs or absolute RPTs in gauge measurement mode

, the autozero

pressure is always zero (atmospheric pressure) which is supplied by definition when
the RPT is vented to atmosphere.

4Internal

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Содержание PPC2+

Страница 1: ... 2001 DH Instruments Inc q 9ZO K SYX KXN 7KSX OXKXMO 7KX_KV ...

Страница 2: ...ne 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 ...

Страница 3: ...LY 10 2 3 3 POWER CONNECTION 10 2 3 4 CONNECTING TO A PRESSURE SUPPLY SUPPLY PORT 11 2 3 5 CONNECTING A VACUUM PUMP EXHAUST PORT 11 2 3 6 CONNECTING TO THE DEVICE UNDER TEST TEST AND TEST PORTS 11 2 3 6 1 INSTALLING THE SPLT 12 2 3 7 THE VENT CONNECTION VENT PORT 13 2 3 8 THE ATM REF PASS THROUGH UNLABELED 13 2 4 POWER UP AND VERIFICATION 13 2 4 1 SWITCH POWER ON 13 2 4 2 CHECK PROPER PRESSURE MEA...

Страница 4: ...SURES FOR LEAK CHECK PURGE FUNCTION 46 3 2 8 5 TYPICAL USE OF THE LEAK CHECK PURGE FUNCTION 47 3 2 9 ANALOG 48 3 2 9 1 VIEWING ANALOG MEASUREMENTS 49 3 3 SETUP MENU KEY 49 3 3 1 CONTROLREF 49 3 3 2 RESLTN 51 3 3 3 SEQUENCE 51 3 3 4 DRIVERS 55 3 4 SPECIAL MENU KEY 56 3 4 1 AUTOZ 56 3 4 1 1 VIEW AUTOZ 59 3 4 1 2 EDIT AUTOZ 60 3 4 1 3 RUN AUTOZ 60 3 4 2 HEAD 64 3 4 3 PRESU 65 3 4 4 INTERNAL 66 3 4 4 ...

Страница 5: ...ALIBRATION INFORMATION 130 5 2 6 SETTING ZNATERR 131 5 2 7 RPT CALIBRATION ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE 132 5 3 ADJUSTMENT OF ON BOARD BAROMETER 133 5 4 CALIBRATION OF ANALOG INPUT 134 5 4 1 CALIBRATION PRINCIPLE 134 5 4 1 1 AUTOMATED INTERNAL CALIBRATION 134 5 4 1 2 USER ADJUSTMENT OF ANALOG MEASUREMENT RANGES AND CHANNELS 135 5 4 2 ADJUSTING ANALOG MEASUREMENT CHANNELS 135 5 5 PN...

Страница 6: ...le 8 UNIT Function Available Units 65 Table 9 Security Levels 73 Table 10 Pin Designations and Connections 78 Table 11 List of PPC2 COM2 DB 9F Pin Designations 78 Table 12 Program Message List 81 Table 13 Error s and Descriptions 83 Table 14 8 Bit Status Byte Register 117 Table 15 8 Bit Standard Event Register 119 Table 16 8 Bit Ready Status Register 120 Table 17 Program Message List 120 Table 18 ...

Страница 7: ...ressure Control Operation 21 Figure 6 Dynamic Pressure Control Operation 22 Figure 7 Ready Not Ready or Static Control Mode 23 Figure 8 Ready Not Ready or in Dynamic Pressure Control Mode 23 Figure 9 Hi and Low RPT Pneumatic Circuit 24 Figure 10 Leak Check Purge Menu Flow Chart 43 Figure 11 Status Register Schematic 117 Figure 12 Internal View 139 Figure 13 Pneumatic Module Schematic 141 Figure 14...

Страница 8: ...ibration information Section 6 is a quick troubleshooting guide Use it to troubleshoot unexpected PPC2 behavior based on the symptom of that behavior 0Y RY O YP cY_ aRY NYX OKN WKX_KV QY NS OM Vc Y OM SYX Y O _Z cY_ KXN ROX QY Y OM SYX PY ZYaO _Z KXN O SPSMK SYX RS aSVV QO cY_ _XXSXQ _SMUVc aS R K WSXSWKV S U YP MK_ SXQ NKWKQO Y cY_ OVP Y cY_ XOa 2 8 aROX cY_ RK O _O SYX Y K Y aYXNO KLY_ KVV RO Q ...

Страница 9: ...ase of use PPC2 measures pressures using one or two high accuracy reference pressure transducers RPTs and an on board barometer Pressures control is achieved by a pneumatic module based on solenoid valves and differential pressure regulators PPC2 can be controlled locally by the operator using a front panel display keypad and special function keys or remotely by a computer using ASCII character co...

Страница 10: ... Exhaust 1 4 in NPT F Atm Ref Pass through Pressure Limits Maximum Working Test Pressure Range H3 5 Maximum Test Pressure without Damage Range H3 10 Recommended Supply Pressure Range H3 10 Maximum Supply Pressure without Damage If Range H3 1 000 psi 7 000 kPa 2 000 psi 14 000 kPa If 300 psi 2 000 kPa Range H3 1 000 psi 7 000 kPa 1 400 psi 9 600 kPa If Range H3 300 psi 2 000 kPa 500 psi 3 500 kPa 1...

Страница 11: ...ge Mode w Autozero 0 003 0 009 Absolute Mode w Autozero 0 003 0 009 Absolute Mode w out Autozero 0 006 0 015 Measurement Accuracy2 90 day 1 year Gauge Mode w Autozero 0 008 0 012 Absolute Mode w Autozero 0 008 0 012 Absolute Mode w out Autozero 0 010 0 017 1 Measurement Precision Combined linearity hysteresis repeatability of measurements made by the reference pressure transducer 2 Measurement Acc...

Страница 12: ...lity test is met Dynamic Sets pressure within hold limit and continuously adjusts as close as possible to target Pressure is Ready when within hold limit Control Parameters Hold limit stability limit optimum values set by default can be customized independently for each measurement range Table 2 Default Pressure Control Parameters Lo REFERENCE TRANSDUCER RANGE 1 2 3 Hi REFERENCE TRANSDUCER RANGE 1...

Страница 13: ... Gauge Mode 0 010 0 013 Absolute Mode w Autozero 0 010 0 013 Absolute Mode w out Autozero 0 012 0 018 1 Control Precision Minimum useable hold limit in dynamic control mode 2 Delivered Pressure Accuracy 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 accuracy as in Section 1 2 2 1 In sta...

Страница 14: ...PPC2 Operation and Maintenance Manual 2001 DH Instruments Inc Page 6 8 89 9 ...

Страница 15: ...s accessories from the shipping container and remove each element from its protective plastic bag 2 1 2 INSPECTING CONTENTS Check that all items are present and have NO visible damage A standard PPC2 includes all items indicated in Table 4 Table 4 PPC2 Packing List DESCRIPTION PART NO PPC2 Pressure Controller Calibrator FAM0002 Calibration Certificate 550100 Test Report 550103 Accessories 401357 o...

Страница 16: ...at the low point of the pneumatic system Support facilities required include An electrical power source of 85 to 264 VAC 47 to 440 Hz A continuous regulated pressure supply of clean dry non corrosive gas at maximum PPC2 range H3 10 to be connected to the SUPPLY port Lower gas pressure supply can be used but should exceed the maximum desired test output pressure by 10 to 20 A vacuum source of less ...

Страница 17: ...D REAR PANELS 2 3 2 1 FRONT PANEL The front panel assembly provides a 2 x 20 vacuum fluorescent display of PPC2 operating status and a membrane keypad for local user control 1 Multi Function Keypad 3 Remote Indicator 2 Direct Pressure Control Keys 4 Display Figure 1 Front Panel 2 3 4 ...

Страница 18: ...UPPLY 10 Pressure Connection TEST 3 Analog Option Connector 11 Pressure Connection TEST 4 Drivers Option Connector models with gauge RPT only 5 IEEE 488 Connector 12 Pressure Connection EXHAUST 6 COM1 Connector 13 Pass Through ATM REF 7 COM2 Connector 14 Pressure Connection VENT 8 Power Switch Figure 2 Rear Panel Assembly 2 3 3 POWER CONNECTION Check that the PPC2 power switch is OFF Connect the s...

Страница 19: ...X RO KM__W Y_ MO S 900 RS S LOMK_ O aROX K _ZZVc Z O _ O S KZZVSON Y RO 6C ZY KXN RO S 89 SX RO OX 98 MYXNS SYX RO O S K MYX KX QK ObRK_ R Y_QR RO B2 ZY Y aRSMR RO KM__W Y_ MO aSVV LO MYXXOM ON Y K _ O YZ SW_W Z O _ O MYX YV aROX MRKXQSXQ RO Z O _ O KZZVSON Y RO B2 ZY P YW KM__W Y K WY ZRO O Y SMO O K LO _ O Y MRKXQO RO MYX YV OPO OXMO O SXQ SP RO O SXQ S 89 SX 9 WYNO OO OM SYX 2 3 6 CONNECTING TO...

Страница 20: ... Y O Z S U K 7SXSWSdSXQ RO VOXQ R YP RO O MYXXOM SYX _LSXQ aSVV OXRKXMO MYX YV ZO PY WKXMO KXN ON_MO Z O _ O O SXQ SWO 0Y XY WKV YZO K SYX RO Y KV YV_WO YP RO NO SMO Y c OW _XNO O SXMV_NSXQ MYXXOM SXQ _LSXQ RY_VN LO VO RKX MM SX _Z Y Z S U K KXN VO RKX MM SX Y O Z S U K Z O _ O MYX YV aSVV XY YZO K O Z YZO Vc SP RO O K O ObMO S O VOKU SX RO O c OW 3X QOXO KV RO WKbSW_W KMMOZ KLVO VOKU K O PY YZ SW...

Страница 21: ...and on board barometer are truly subject to atmospheric pressure rather than to the pressure inside the PPC2 case which may be slightly different from ambient pressure Y XY ZV_Q Y YL _M RO 7 0 ZK R Y_QR K RS WKc KN O OVc KPPOM 1 1 WYNO YZO K SYX YX KX KL YV_ O KX N_MO KXN K_ YdO YSXQ YP KX KL YV_ O 6Y 2 4 POWER UP AND VERIFICATION 2 4 1 SWITCH POWER ON Actuate the power switch on the PPC2 rear pan...

Страница 22: ... with each other within PPC2 measurement tolerances see Section 1 2 2 If they do not agree within tolerances PPC2 may need calibration or repair 2 4 2 2 CHECKING GAUGE MODE PRESSURE MEASUREMENT If the PPC2 is not vented press the VENT direct pressure control key to vent it see Section 3 1 2 2 Press the UNIT function key and select gauge mode Change the pressure unit if desired see Section 3 2 2 Ob...

Страница 23: ...O 2 4 5 CHECK PROPER PRESSURE CONTROL OPERATION Select a pressure range using the RANGE function see Section 3 2 1 Press the CONTROL function key and select dynamic see Section 3 2 3 Press ENTER Specify a target pressure within the active range and press ENTER again see Section 3 2 3 PPC2 should set the target pressure and indicate Ready see Section 3 1 2 4 continuously in 15 to 60 seconds If it d...

Страница 24: ...PPC2 Operation and Maintenance Manual 2001 DH Instruments Inc Page 16 8 89 9 ...

Страница 25: ...Section 3 2 2 5 Indicates whether a head correction is applied h if applied blank if not see Section 3 2 7 6 Indicates whether the autozero function is ON or OFF z if ON blank if OFF see Section 3 4 1 7 SR Indicates active RPT H for high L for low and range 1 low 2 mid 3 hi see Section 3 2 1 8 Used only when running a sequence Indicates number of current increment over total number of increments i...

Страница 26: ...3 1 2 1 MAIN 4 X 4 KEYPAD LAYOUT AND PROTOCOL The PPC2 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 Section 3 2 These keys enter numerical v...

Страница 27: ... RO RSNNOX WOX_ MRYSMO SP cY_ UXYa S 3 1 2 2 DIRECT PRESSURE CONTROL KEYS The direct pressure control keys provide direct manual 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 direct pressure control keys interrupt and override automated pressure control Pressing the VENT key causes PPC2 to...

Страница 28: ...in static control or when automated control is not active See Section 3 1 2 3 Static Control and Dynamic Control for a detailed explanation of each control mode and its advantages the default control parameters and the Custom Control options O SO YP Z O _ O MYX YV K QO KV_O MKX LO Z YQ KWWON K YXO SWO SXMV_NO Y RO Z O O YZO K SXQ ZK KWO O _ SXQ RO 8 P_XM SYX OO OM SYX Static Control Static control...

Страница 29: ... to the target value as possible The advantage of this control mode is that the final pressure achieved will be the same as the target value However unlike static control in dynamic control a control error will be included in the pressure achieved The maximum value of the control error is equal to the hold limit The average value of the control error is generally well inside the hold limit During ...

Страница 30: ...are Pressure Ready Pressure Not Ready and decreasing Pressure Not Ready and increasing When pressure control is NOT active A Ready condition will occur any time NO control valve is operating and 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 When pressure control is active The crit...

Страница 31: ...Nc O SXQ O _ O Y K QO KV_O 8Y OKNc O _ O K O YP RKXQO 9_ YP KLSVS c 6SWS 8Y OKNc O _ O AOX 9_ YP 2YVN 6SWS KXN O O SXQ OKNc O _ O SX 2YVN 6SWS KXN KLSVS c 6SWS SWO 2YVN 6SWS OKNc O _ O SX 2YVN 6SWS KXN KLSVS c 6SWS Figure 7 Ready Not Ready or Static Control Mode Dynamic Control Ready Not Ready or When dynamic pressure control mode is active a Ready condition will occur when The current measured pr...

Страница 32: ...2 handles all of the data and internal valving operations needed to make range changes occur transparently to the operator when the RANGE function is used to select a range Ranges available can be viewed at any time but changing ranges can only occur when PPC2 is vented When ranges are changed the upper limit is automatically changed to the default for that range or to the last upper limit that wa...

Страница 33: ...AY SYMBOL Lo RPT Lo range Lo 1 L1 Lo RPT Mid range Lo 2 L2 Lo RPT Hi range Lo 3 L3 Hi RPT Lo range Hi 1 H1 Hi RPT Mid range Hi 2 H2 Hi RPT Hi range Hi 3 H3 The display symbol is included in the upper right hand corner of most PPC2 menu displays as a convenient indicator of active range 3 2 DIRECT FUNCTION KEYS 3 2 1 RANGE m PURPOSE To view and or change the pressure measurement range m PRINCIPLE E...

Страница 34: ... RPT is a gauge only RPT there is no absolute a range indicated 5 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 For example 1 Identifies RPT Lo or Hi 2 Identifies range of the RPT 1 2 or 3 3 Range designator 4 Full scale pressure value in the ac...

Страница 35: ...sure relative to an evacuated and sealed reference These can also be used to measure in gauge mode by the subtraction of atmospheric pressure PPC2 supports extensive on board logic and measurements to assure the precise atmospheric compensation of absolute RPTs to deliver gauge measurements see Section 3 4 1 This allows simple one step switching between gauge and absolute measurement modes by the ...

Страница 36: ...3 ARO RO RO S O _Z K Y 3 S SXNSMK ON Lc RO SQR aY MRK KM O YX RO YZ VSXO YP RO SX YN_M SYX M OOX aRSMR MKX LO SOaON Lc Z O SXQ E G P YW RO WKSX _X M OOX Y aROX ZYaO SXQ _Z 0Y KX 3 RO NOPK_V _XS K O U K K 7 K LK WLK WWAK 8Y OPO OXMO OWZO K _ O OVOM SYX S XOMO K c PY RO _XS WWAK K RO YXVc OPO OXMO OWZO K _ O MYWWYXVc _ ON PY WWAK S Ù RO Z O _ O WOK _ OWOX _XS OVOM ON S KXQO ZOMSPSM AROX SX K QS OX K...

Страница 37: ...f the operation and purpose of static and dynamic control modes see Section 3 1 2 3 m OPERATION To select the control mode for the currently active range and set control parameters to the default control parameters press the CONTROL function key from the main run screen The display is Selecting 1static or 2dynamic causes the selected pressure control mode to be activated with default control param...

Страница 38: ... value to be set automatically Comes up with last entry or zero if pressure measurement units have been changed range 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 3 2 2 for information on zero pressure commands Also the and keys can be pressed to jog the current target pressure value displayed down or ...

Страница 39: ... S U K QK_QO Y RO RKX dO Y QK_QO K KM__W Z_WZ W_ LO MYXXOM ON Y RO B2 ZY OO OM SYX KXN W_ LO O _Z PY MYX YV _ SXQ K KM__W OPO OXMO OO OM SYX DO Y QK_QO Z O _ O MKX KVaKc LO O O SXQ RO E G KXN E G ONS SXQ UOc YX RO b UOcZKN MKX LO _ ON aRSVO MYX YVVSXQ Y TYQ RO Z O _ O MYX YV K QO KV_O NYaX Y _Z Lc RO M_ OX RYVN VSWS RO O UOc KV Y TYQ RO K QO KV_O aROX SX RO 8 K QO KV_O M OOX Interrupting Automated...

Страница 40: ...PPC2 responds by reducing the pressure as far as possible using down fast pressure control A Ready condition will be indicated when the stability limit is reached and the control down fast valve will remain open keeping the vacuum pump connected to the PPC2 pneumatic module and TEST port When pressure control is suspended or a non zero pressure target is executed the bypass interrupt valve is open...

Страница 41: ...hen the UPPER LIMIT function key is pressed from the main run screen the display is 1 Entry field to enter desired upper limit value Enter the desired upper limit value and PPC2 returns to the main run screen with a new upper limit value active When the UPPER LIMIT has been exceeded the display of current pressure flashes and a buzzer sounds for 3 seconds every 2 seconds Reduce pressure using dire...

Страница 42: ...cal calibration sequence on a device or system being tested There are two types of sequences Quick Sequence see Section 3 2 5 1 allows quick definition and execution of a sequence in the current range and using all of the current settings e g pressure units control mode control settings File Sequence see Section 3 2 5 2 allows execution of a preprogrammed sequence script including the PPC2 range t...

Страница 43: ...ment in terms of of the full scale FS value entered in the previous screen The sequence will run between zero and full scale in pressure steps of full scale x increment starting from zero and ending with the uneven increment if applicable Enter the desired pressure increment and press ENTER The next display is This selection determines the order in which the sequence increments will execute Select...

Страница 44: ...uences is done by pressing SETUP and selecting 3Sequence see Section 3 3 3 3 2 5 3 RUNNING A SEQUENCE m PURPOSE Selecting 1Yes in the Run current quick sequence menu causes the current quick sequence to execute Entering a valid sequence file number from the Run Sequence File menu causes a file sequence to execute A Quick Sequence executes in the current range with the current settings A File Seque...

Страница 45: ... increments in sequence Changes to ENTER or countdown time remaining once Ready condition has been reached at target value Except for the bottom right hand corner the sequence run display is identical to the normal main run screen see Section 3 1 1 The bottom right corner provides information on sequence execution This information updates as each sequence increment is executed If the sequence was ...

Страница 46: ...C2 pressure control and measurement specifications The default parameters are automatically set each time the control mode is selected using the CONTROL function key see Table 7 The CUSTOM CONTROL function allows the hold and stability limit parameters to be adjusted by the user This can be used to increase control speed time to Ready usually by decreasing control precision or to increase precisio...

Страница 47: ... default hold limit or the last custom hold limit set for the currently active range Enter the desired hold limit The next display is 1 Current reference transducer H for high L for Lo and range 1 2 or 3 2 Current control mode S for static D for dynamic 3 Entry field for setting the desired stability limit Recalls the default stability limit or the last custom stability limit for the currently act...

Страница 48: ...pplied 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 PPC2 RPT at its test port in order to accurately predict the pressure actually applied at a different height PPC2 can accurately calculate head pressures for nitrogen helium and air as the test gas over its working pressure range The HEAD function allow...

Страница 49: ... ON Lc R SX RO YZ VSXO YP RO WKSX _X M OOX OO OM SYX AROX RO 2 P_XM SYX S 900 RO R S XY RYaX Y MRKXQO _XS YP ROKN ROSQR LO aOOX SXMRO KXN MOX SWO O KXN Y MRKXQO RO O QK ZOMSO Z O E 3 6G KXN OVOM 2OKN OO OM SYX RO OPO OXMO ROSQR YP RO Z O _ O WOK _ OWOX S RO WSNNVO YP RO ZY RO ROKN ROSQR RY_VN LO OX O ON K K ZY S S O KV_O SP RO NO SMO Y c OW _XNO O S RSQRO RKX RO KXN XOQK S O SP S S VYaO 3 2 8 LEAK...

Страница 50: ...depressurized by PPC2 To every extent possible only clean hoses and connections should be used in connecting PPC2 to test devices or system and those devices and systems should be free of liquid contaminants However in the event that PPC2 will need to be used to test some devices or systems that contain small amounts of liquid contaminants a Self Purging Liquid Trap SPLT accessory supported by the...

Страница 51: ...pears when the PURGE LEAK CHECK function key has been pressed from the main run screen 1 Current measured pressure and pressure units 2 Active reference pressure transducer and range 3 Current rate of change of pressure leak rate in current pressure units minute updated every 10 seconds 4 Current rate of change of pressure leak rate in current pressure units second This screen is for observing the...

Страница 52: ... Y LO WKNO 3 2 8 3 PURGE FUNCTION 0Y RO Z_ QO P_XM SYX Y YZO K O RO 1 P_XM SYX W_ LO OXKLVON Lc Z O SXQ E 3 6G KXN OVOM SXQ 3X O XKV _ QO OO OM SYX KXN KX YZ SYXKV OVP _ QSXQ 6S _SN KZ 6 W_ LO MY OM Vc SX KVVON SX RO VSXO MYXXOM SXQ RO ZY Y RO NO SMO Y c OW _XNO O OO OM SYX RO 1 P_XM SYX WKUO _ O YP RO KV O N S O YZ SYX KV O N S O X_WLO S _ ON Y KM _K O RO 6 ObRK_ KV O RO 6 ObRK_ KV O 3 KM _K ON a...

Страница 53: ...0 kPa gauge O SXQ E G K KXc SWO N_ SXQ Z_ QO Y_ SXO ObOM_ SYX MK_ O RO Z_ QO P_XM SYX Y KLY KXN O _ X Y RO VOKU MROMU M OOX OO OM SYX Once the current pressure is or if the purge function was initiated under 100 psi 700 kPa gauge the display is 1 Current measured pressure and pressure units 2 Current reference pressure transducer and range 3 Indication that PPC2 is waiting 5 seconds and preparing ...

Страница 54: ...KWSXK SYX OX SP KX 6 S LOSXQ _ ON Z OMK_ SYX RY_VN LO KUOX Y ON_MO ZY OX SKV VS _SN MYX KWSXK SYX P YW RO NO SMO Y c OW _XNO O K W_MR K ZY SLVO LOPY O WKUSXQ RO MYXXOM SYX Y RO ZY Y XY ZV_Q RO 6 ObRK_ KV O RO Z_ QO Y_ SXO MKX XY LO MYWZVO ON aS R RO 6 ObRK_ KV O ZV_QQON KXN RO 6 Z Y OM S O P_XM SYX aSVV XY LO OPPOM S O 3P RO 6 S OVOM SMKVVc MYXXOM ON Y RO S ObRK_ KV O aSVV KVaKc LO YZOX aROX RO OX...

Страница 55: ...t of liquid contamination is observed exhausting from the SPLT exhaust valve To leak check Press the LEAK CHECK function key Use the direct manual pressure control keys to set the desired leak check pressure generally full scale of the device or system under test Wait for pressure to stabilize Observe the leak rates displayed in the leak check screen to determine if the leak rate is within accepta...

Страница 56: ...0 mV 0 to 5 V 0 to 10 V 4 20 mA The selected range is effective on all of the inputs together The measurement is available on the PPC2 front panel or remotely m OPERATION To access the ANALOG function press the ANALOG function key from the main run screen If the PPC2 is equipped with the analog input option the display is Input range 1 100 mV 2 5V 3 10V 4 4 20 mA The cursor is on the number of the...

Страница 57: ...ON KXN Y O O c WSX_ O YP YZO K SYX OO OM SYX RO KXKVYQ P_XM SYX ZO PY W KX K_ Y MKVSL K SYX McMVO RS McMVO MYWZVO O SX KLY_ OMYXN N_ SXQ aRSMR KXKVYQ WOK _ OWOX K O SX O _Z ON KXN RO KXKVYQ KV_O PSOVN NS ZVKc NK RO 3 3 SETUP MENU KEY m PURPOSE The SETUP menu key accesses a menu of functions and features commonly used in setting up PPC2 for use m OPERATION Press the SETUP key from the main run scre...

Страница 58: ...idden and the exhaust port condition set manually The ControlRef function allows setting of whether the EXHAUST port condition will be determined automatically using the exhaust sensor or set manually It also allows viewing of the current status of the EXHAUST port RO XY WKV MYXNS SYX YP RO YX YV OP P_XM SYX S K_ Y 3X RS MYXNS SYX RO YZO K Y XOON XY LO MYXMO XON aS R SXPY WSXQ RO YP B2 ZY Z O _ O ...

Страница 59: ... 2Resltn The display is Enter the desired pressure display resolution in FS of the currently active range The display returns to the main run screen with the entered resolution setting active RO c OW NOPK_V Z O _ O NS ZVKc O YV_ SYX S 0 RO O YV_ SYX O SXQ S KXQO ZOMSPSM O YV_ SYX O SXQ WKNO SX YXO KXQO NYO XY KPPOM Y RO KXQO 3 3 3 Sequence m PURPOSE To create store and edit the sequence files used...

Страница 60: ... is selected The file number under which the sequence definition should be stored m OPERATION O _OXMO PSVO O _Z O _S O RO _ O Y ZOMSPc K VK QO X_WLO YP ZK KWO O SX K O SO YP NK K OX c M OOX NO M SLON LOVYa 0Y K _WWK c YP RO O _OXMO NOPSXS SYX O _S OWOX SX RO Y NO ROc K O ONS ON OO 38 3 6 YP RS OM SYX To access the Sequence file building function press SETUP and select 3Sequence The display is Sele...

Страница 61: ...t selections specify the pressure unit and measurement mode in which the sequence pressure target pressures will be defined 3P RO OVOM ON PY RO O _OXMO S K QK_QO 1BBBB RO WOK _ OWOX WYNO OVOM SYX aSVV XY LO YPPO ON K QK_QO MKX YXVc WOK _ O SX QK_QO WYNO Press ENTER to proceed to the pressure unit and measurement mode selection These will operate in the same manner as when the UNIT function is used...

Страница 62: ...is executed PPC2 will wait at each pressure target until ENTER is pressed before proceeding to the next target If 2Timer is selected when the sequence is executed PPC2 will start a timer when a Ready condition is reached at a pressure target Each time the timer expires the sequence will proceed automatically to the next pressure target If dwell is selected the dwell time in seconds minimum 1 and m...

Страница 63: ...nector OO OM SYX PY N S O ZOMSPSMK SYX KXN ZSX Y_ m OPERATION To access the driver control function press SETUP and select 4drivers The display is Pressing the keypad numerical key driver number turns that driver ON and OFF with either a momentary or a toggled response see next paragraph An active driver is indicated by immediately following the driver number Pressing ENTER while in the External d...

Страница 64: ...ponent of the change over time of the PPC2 RPTs is zero drift or offset independent of span Rezeroing PPC2 RPTs relative to a more stable reference between recalibrations allows higher measurement accuracy specifications to be maintained with less frequent full calibrations The PPC2 autozero function AutoZ provides full on board support for the rezeroing process to simplify its application by the ...

Страница 65: ...e gauge pressure Gauge Mode with an Absolute RPT Dynamic Compensation for Atmospheric Pressure PPC2 allows gauge pressure measurements with an absolute RPT by calculation subtracting the value of atmosphere tare from the RPT s absolute 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...

Страница 66: ...utoZ 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 Execute the run AutoZ routine only when a reference whose accuracy is known to be significantly better than that of the PPC2 RPT is available Keep range ratios in mind when comparing accuracy A 0 01 FS barometer is rough...

Страница 67: ...de to be viewed Selecting 3edit allows the value of ZOFFSET for the current range and measurement mode to be edited Selecting 4run allows the routine for determination and activation of ZOFFSET by measurement of ZSTD to be executed 3 4 1 1 VIEW AUTOZ To view the current ZOFFSET for the current range and measurement mode press SPECIAL and select 1AutoZ 2view The display is 1 Current measurement mod...

Страница 68: ...e and measurement mode press SPECIAL and select 1AutoZ 3edit The display is 1 Current measurement mode 2 Current range 3 Edit field for value of ZOFFSET RO KV_O YP D900 S KVaKc NS ZVKcON KXN OX O ON SX K MKV K 3 4 1 3 RUN AUTOZ 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 PRINCI...

Страница 69: ...WY ZRO SM Z O _ O KXN KWLSOX OWZO K _ O PY Y WSX_ O LOPY O _XXSXQ _ YD 3P _XXSXQ _ YD O _V SX KV_O YP D900 RK K O Q OK O RKX Ý 0 YP RO M_ OX WOK _ OWOX KXQO RO KXN Y RO Y_ MO YP D WKc LO Y_ YP YVO KXMO Y RO _ YD Z YMO WKc RK O LOOX PK_V c OPY O KM S K SXQ K XOa D900 Q OK O RKX Ý 0 YP RO M_ OX KXQO MROMU Y LO _ O RK LY R RO KXN RO Y_ MO YP D aO O SX QYYN aY USXQ Y NO Z YZO Vc OX ON Y KLVO K WY ZRO ...

Страница 70: ...L and select 1AutoZ 4run 1Entry The display is 1 Pressure reading units and mode of the active RPT range 2 Active range indicator 3 Entry field for the value of ZSTD Enter the value of ZSTD in the current units The next display is 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 main...

Страница 71: ...ess ESCAPE to maintain the old ZOFFSET and return to the main run screen 0Y Y MYWW_XSMK O aS R KX 7 MYXXOM ON Y S 97 ZY RO KXN RO 7 SX O PKMO W_ LO O _Z Z YZO Vc OO OM SYX 3P RO S _XKLVO Y VYMK O KX 7 YX 97 aROX _XXSXQ _ YD Lc 97 KP O OMYXN S aSVV SWO Y_ KXN NS ZVKc 7 XY NO OM ON RO KV_O YP D900 S KVaKc NS ZVKcON KXN OX O ON SX K MKV K Run AutoZ by RngL3 The AutoZ by RngL3 choice is only available...

Страница 72: ...Lc 6Y LO _ O RK KXQO 6 YP RO 6Y S MY OM Vc MKVSL K ON KXN K_ YdO YON RO KV_O YP D900 S KVaKc NS ZVKcON KXN OX O ON SX K 3 4 2 HEAD m 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 see Section 3 2 7 m OPERATION From the main run screen press SPECIAL and sel...

Страница 73: ...PPC2 to offer a very wide selection of units while simplifying day to day operation The typical user will customize the UNIT function key to support his her six most commonly used units m OPERATION To customize the UNIT function key from the main run screen press SPECIAL and select 3PresU The display is 1 Entry field to select which unit position 1 6 of the UNIT function key menu is to be changed ...

Страница 74: ...s Select the internal function desired For a detailed description of each internal function See Sections 3 4 4 1 to 3 4 4 9 YWO M OOX _MR K RO 3 6 3X O XKV WOX_ QY LOcYXN RO aY VSXO Z Y SNON Lc RO NS ZVKc RS S SXNSMK ON Lc K PVK RSXQ K Ya SX RO OMYXN VSXO YP RO NS ZVKc O RO E G KXN E G K Ya UOc Y WY O RO M_ Y Y KMMO RO VSXO RK K O XY S SLVO Y NS OM Vc OX O RO X_WLO YP RO RSNNOX WOX_ MRYSMO SP cY_ ...

Страница 75: ...nication 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 PPC2 front panel m OPERATION To access the port configurations and remote program command mode select 3Remote under 4Internal of the SPECIAL menu Select COM1 C...

Страница 76: ...ed The PPC2 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 PPC2 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...

Страница 77: ...aS R UXYaVONQO YP O O MYX O _OXMO O O P_XM SYX RY_VN XO O LO _ ON ObZO SWOX KVVc m OPERATION To access the reset function press SPECIAL and select 4Internal 5Reset The display is Reset Sets m PURPOSE Sets most general system operating parameters back to default values Does not affect calibration coefficients or remote interfaces Returns each range unit of measure to the first of six available see ...

Страница 78: ...ars all of the user defined file and quick sequences See Sections 3 2 5 and 3 3 3 Sets user level control configuration to factory defaults See Sections 3 4 4 1 and 5 5 Reset Cal m PURPOSE RO O O MKV P_XM SYX aSVV NOVO O MKVSL K SYX MYOPPSMSOX MRKXQSXQ RO MKVSL K SYX Clears all user values affecting the calibration of RPTs and the on board barometer including Sets all user RPT PA PM values to 0 an...

Страница 79: ...ser protection levels to restrict access to certain functions and to edit the password required for changing user levels m PRINCIPLE PPC2 s front panel user interface provides the means to access all PPC2 user defined data settings and functions including calibration data Inadvertent uninformed or unauthorized altering or deleting of data settings and functions could require extensive reconfigurat...

Страница 80: ...rming many different tasks Medium This level of security is designed to protect specific metrological information in the system and to assure that the PPC2 is operated using consistent operational parameters High 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 ...

Страница 81: ... 1AutoZ edit X X X SPECIAL menu 2Head X X SPECIAL menu 3PresU X X SPECIAL menu 4Internal X X SPECIAL menu 1Config X X X SPECIAL menu 4Internal 2Cal X X X SPECIAL menu 4Internal 4Time edit X X X SPECIAL menu 4 Internal 5Reset 4cal X X X SPECIAL menu 4Internal 5Reset 5all X X X m OPERATION PPC2 is delivered with no active password and access to the User Level menu is open The user level is set to 1L...

Страница 82: ...ents 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 RO PKM Y c OMYXNK c ZK aY N S K KSVKLVO SX MK O RO _ O ZK aY N RK LOOX WS ZVKMON Y PY QY OX 3 MKX LO YL KSXON Lc MYX KM SXQ 23 _ YWO O SMO RO PKM Y c OMYXNK c ZK aY N S NSPPO OX PY KVV KXN MRKXQO OKMR SWO S S _ ON...

Страница 83: ... purge enable disable function press SPECIAL and select 4Internal 8Purge Select 1yes to enable purge or 2no to disable purge AROX RO Z_ QO P_XM SYX S OXKLVON aSVV WKUO LKMUQ Y_XN _ O YP KV O N S O MRKXXOV SXNOZOXNOX Vc YP _ O KM SYX OO OM SYX 3 4 4 9 SCRSAV m PURPOSE To adjust the PPC2 screen saver function m PRINCIPLE PPC2 has a screen saver function which causes the display to dim after a front ...

Страница 84: ...PPC2 Operation and Maintenance Manual 2001 DH Instruments Inc Page 76 8 89 9 ...

Страница 85: ... is received The menus usually accessed from the front panel are locked out while in remote The ESCAPE key returns the PPC2 to local operation unless the REMOTE program message was sent to the unit which locks out all keypad operation 4 2 1 RS 232 INTERFACE 4 2 1 1 COM1 The PPC2 COM1 RS 232 interface is located on the back of the unit It is a 9 pin male DB 9F connector configured as a DCE device D...

Страница 86: ...off release of the NRFD handshake line until it can service and empty the receive buffer This keeps the buffer from overflowing 4 2 1 3 COM2 The PPC2 COM2 RS 232 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 PPC2 This allows the user to use one Host COM port to communicate with the PPC2 and an additional RS 232...

Страница 87: ...ands see DEVICE DPG ISO PPC HOLD TOUT TS CONFIG10 This format is recommended only if you need downward compatibility with older PPC2 controllers Each program message sent is also a query You can only send one program message to the PPC2 at time After sending any program message you must wait for the PPC2 to reply before sending another program message This reply will contain data or a numeric erro...

Страница 88: ...e with a semicolon The commands will be queued and executed in as received order If you are using the RS 232 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 4 3 2 2 ENHANCED PROGRAM MESSAGE USING THE QUERY TYPE The Query type ...

Страница 89: ... PPC2 Command DF Decrease the pressure quickly DP Decrease the 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 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 i...

Страница 90: ...N Read the serial number of the PPC2 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 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 ...

Страница 91: ... s and Descriptions REPLY DESCRIPTION ERR 0 OK ERR 2 Text argument is too long ERR 3 User defined coefficient cannot be 0 ERR 4 External device not detected ERR 5 External device improperly configured ERR 6 Numeric argument missing or out of range ERR 7 Missing or improper command argument s ERR 8 External device time out error ERR 9 Unknown command ERR 11 Command missing argument ERR 12 System ov...

Страница 92: ...st separate them The PPC2 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 PPC2 then this section will describe the arguments and their limits Defau...

Страница 93: ...PPC2 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 PPC2 There is no other reply from this program message Prior to using this program message you must ensure that the PPC2 COM2 port is correctly set up to communicate with the device on COM2 Refer to the COM2 program message Example classic Sent Reply ...

Страница 94: ... AINCAL1 012 1 002 0 012 1 002 Example classic Cmd Sent Reply AINCAL 012 1 002 0 012 1 002 Errors ERR 6 The argument s are invalid See Also Sections 3 2 9 5 4 ainR Purpose To request the next available measurement of the analog inputs Query Classic AINR AINR Remarks The PPC2 measures the analog inputs every 0 75 seconds This command requests the next measurement cycle results from the PPC2 The res...

Страница 95: ...ge is changed an auto calibration cycle occurs which takes about 10 seconds Example enhanced Cmd sent Query reply AINRNG 2 2 Example classic Cmd Sent Reply AINRNG 2 2 Errors ERR 6 The argument s are invalid See Also Section 3 2 9 ATM Purpose Reads the next measured internal ambient pressure Query Classic ATM ATM Remarks The atmospheric pressure as measured by the PPC2 on board barometer will be re...

Страница 96: ...rgument was other than a 0 or a 1 See Sections 3 4 4 8 3 2 8 AUTOVAC Purpose Read or set the status of the automated Control Ref determination mode Command Query AUTOVAC n AUTOVAC Classic AUTOVAC n AUTOVAC Default AUTOVAC 1 Arguments n 0 To disable AUTO mode 1 To enable AUTO mode This will override the manual selection Remarks The PPC2 has an internal sensor that can be used to automatically deter...

Страница 97: ...rt Command Query COM1 baud parity data stop 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 communica...

Страница 98: ...s available Example enhanced Cmd sent Query reply COM2 9600 N 8 1 9600 N 8 1 Example classic Sent Reply COM2 9600 N 8 1 9600 N 8 1 Errors ERR 7 Missing or improper program message argument s See Also Section 3 4 4 3 PASSTHRU CONFIG This is an obsolete PPC2 Command Purpose PPC2 does not support a remotely activated configuration routine The CONFIG command from PPC2 will reply as if CONFIG had occur...

Страница 99: ... Section 5 8 1 7 DP Purpose Decrease the pressure slowly a given amount using the slow speed Command DP n Classic DP n Arguments n The decrease in pressure desired current pressure units This can be from 0 to 2 FS of the current RPT range Remarks The slow speed will be used for a calculated amount of time up to 5 seconds to create the desired change The PPC2 will not attempt to control the pressur...

Страница 100: ...pening the slow down valve will cause the pressure to decrease slowly Example Enhanced Cmd sent Reply DS 1 1 no reply if IEEE 488 Example Classic Sent Reply DS 1 DS 1 Errors ERR 6 The n argument is a 0 or a 1 See Also Section 5 8 1 7 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 tha...

Страница 101: ...t the test instead of the pressure at the PPC2 Example enhanced Cmd sent Query reply HEAD 10 in N2 10 in N2 Example classic Sent Reply HEAD 10 in N2 10 in N2 Errors ERR 6 The arguments are not within given limits See Also Section 3 2 7 HOLD This is an obsolete PPC2 Command Purpose Makes the current pressure the target pressure and controls to the target pressure in the current control mode HS Purp...

Страница 102: ...ssure to increase quickly Care must be used as the pressure will not stop increasing until the valve is closed or the upper limit is passed Example enhanced Cmd sent Reply IF 1 1 no reply if IEEE 488 Example classic Sent Reply IF 1 IF 1 Errors ERR 6 The n argument is a 0 or a 1 See Also Section 5 8 1 7 UL IP Purpose Increase the pressure a given amount using the slow speed Command IP n Classic IP ...

Страница 103: ...pressure See Section 5 8 1 7 LL Purpose Read or set the lower pressure limit for the current range PPC2 BG0002 model only Command LL n Classic LL n Arguments n The lower pressure limit for the current pressure range in the current unit of measure Value is always gauge pressure Remarks The PPC2 BG0002 has a lower limit for each of its ranges New automated pressure control targets can not be less th...

Страница 104: ...ttings are reset to default as if the RESET program message was executed and the MEM status will be set to reflect this Example enhanced Query sent Reply MEM 0 PPC2 data corrupted and was set to factory defaults 1 The memory was found to be OK on power up Example classic Sent Reply MEM MEM 0 PPC2 data corrupted and was set to factory defaults MEM 1 The memory was found to be OK on power up See Als...

Страница 105: ...lso Section 4 3 NVENT Purpose Read or set the status of lo vent valve PPC2 BG0002 model only Command Query NVENT n NVENT Classic NVENT n NVENT Default NVENT AUTO Arguments n 0 to close the lo vent valve 1 to open the lo vent valve AUTO for the PPC2 BG0002 to open and close the lo vent valve Remarks PPC2 BG0002 has a second vent valve that is used to vent the TEST port This valve is normally contro...

Страница 106: ...another device The Command format specifies and sends the argument A carriage return and a line feed CR LF 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 device This message received by the COM2 port must be terminated with a carriage return or a carriage return and a line feed Only one mess...

Страница 107: ... to 1 1 CalDate The date of the calibration in the format YYMMDD Remarks The user defined pressure calibration information for the specified RPT HI or LO pressure 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 ...

Страница 108: ...y 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 pressure UNITS rate UNITS s atm UNITS Here are the field descriptions ready R if the current pressure ready criteria has been met NR if the criteria has not been met see the SR program message pressure Th...

Страница 109: ...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 it may 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 Note with PPC2 BG0002 the volume ...

Страница 110: ...nt pressure units Remarks The PPC2 will generate 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 The PR PRR STAT or SR program message can be used to monitor the progress of the generation Example enhanced Cmd sent Reply PSS 1000 1000 000 kPaa no reply if IEEE 488 ...

Страница 111: ...descriptions ready R if the current pressure ready criteria has been met 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 curren...

Страница 112: ...e units are meters then the range will be specified in kPa If the units are feet then the range will be specified in psi Example enhanced Cmd sent Query reply RANGE 1 LO 30 psia Example classic Sent Reply RANGE 1 LO 30 psia Errors ERR 6 ERR 22 ERR 38 Invalid n or XX argument System must be vented for the requested operation The selected range is not available See Also Sections 3 1 2 5 3 2 1 RATE P...

Страница 113: ...le classic v2 01 up Sent Query reply READYCK 1 READYCK 1 if PPC2 condition has stayed ready READYCK 0 if PPC2 condition has NOT stayed ready Example classic v2 00 Sent Query reply READYCK 1 1 if PPC2 condition has stayed ready 0 if PPC2 condition has NOT stayed ready Errors ERR 6 Argument is not a 0 or a 1 See Also Section 3 1 2 4 SR program message REMOTE Purpose Lock out the front panel controls...

Страница 114: ...S Example classic Sent Reply RES 01 0 01 FS Errors ERR 6 The argument is invalid See Also Section 3 3 2 RESET Purpose Reset the user s settings to factory defaults Command RESET Classic RESET Remarks The PPC2 has user settings units resolution control modes etc that can be reset to factory defaults Calibration sequences and communications settings will not be affected The remote RESET program mess...

Страница 115: ...get pressure is invalid See Also Section 3 2 3 PS TP SCRSAV Purpose Read or set the front panel screen saver period Command Query SCRSAV n SCRSAV Classic SCRSAV n SCRSAV Arguments n The inactivity period minutes Default SCRSAV 10 Remarks The PPC2 front panel will dim after a period of keyboard and remote inactivity Setting this value to 0 will disable this feature Example enhanced Cmd sent Query r...

Страница 116: ...ility 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 PPC2 will then use CUSTOM control settings Example enhanced Cmd sent Query reply SS 1 0 10 Example classic Sent Reply SS 1 0 10 Errors ERR 6 The argument was invalid See Also Sections 3 1 2 3 3 1...

Страница 117: ...ented with the exhaust valve open Quickly decreasing the pressure to reach a hard vacuum A new target has been requested but generation has not started Dynamic pulsing is being used to control a pressure Static pulsing is being used to control a pressure Low pressure control is active Very low pressure control is active Example enhanced Query sent Query reply STAT 32 Example classic Sent Reply STA...

Страница 118: ...lete PPC2 Command Purpose The PPC2 target limit cannot be set independently so the TS command has no effect Will always respond with of current hold limit See HOLD TST Purpose Read the power on self test status Query TST Remarks The PPC2 system memory stores the user settings units resolution generation settings and retains them when the unit if OFF On power up this memory is checked If this memor...

Страница 119: ...mple classic Sent Reply UCOEF 0 0010000000 kPa See Also Section 3 2 2 UDU Purpose Read or set the user defined pressure units Command Query UDU label ucoef UDU Classic UDU label 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 th...

Страница 120: ...easurement 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...

Страница 121: ...ollowed 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 wi...

Страница 122: ... then the query returns the last VAC setting Example enhanced Cmd sent Query reply VAC 1 0 1 Example classic Sent Query reply VAC 1 VAC 0 VAC 1 Errors ERR 6 The argument is not a 0 or a 1 See Also Section 3 3 1 AUTOVAC VENT Purpose Read execute or abort a vent process Command Query VENT n VENT Classic VENT n VENT Arguments n 1 to start a vent process 0 to abort a vent process and close the exhaust...

Страница 123: ...s ZOFFSETn HI 0 0 800101 ZOFFSETn LO 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 Hi or Lo 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 HI or LO pressure and RPT range low...

Страница 124: ... 961201 Example classic Sent Reply ZNATERR1 LO 10 961201 10 00 Paa 961201 Errors ERR 6 One of the arguments are out of range See Also Sections 3 4 1 5 2 6 4 5 STATUS REPORTING SYSTEM The PPC2 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 PPC2 can be pro...

Страница 125: ...his register is affected by the PPC2 reply output queue the Error Queue the Standard Event Status register and the Ready Event Status register Status Byte Register STB or SRE n OPER 128 RQS MSS 64 Standard Event Status Register ESR or ESE n ESB 32 PON 128 URQ 64 CMD 32 EXE 16 DDE 8 QYE 4 RQC 2 OPC 1 MAV 16 OUTPUT QUEUE N A 8 ERROR 4 ERROR QUEUE N A 2 Ready Event Status Register RSR or RSE n RSR 1 ...

Страница 126: ...icates that the SRQ line of the IEEE 488 interface has been asserted by the PPC2 This bit is cleared when a serial poll is performed on the PPC2 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 PPC2 to request service from the Host...

Страница 127: ...e the last time this bit was read or cleared URQ User Request Bit 6 Indicates that the PPC2 was set to local operation manually from the front panel by the user pressing the ESC key 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 EXE Execution Error Bit 4 Indicates if a remote program message...

Страница 128: ...tion 3 1 2 4 RDY Generation Ready Bit 0 Indicates that the PPC2 has reached a target pressure and is Ready as defined by the control settings see Sections 3 1 2 4 and 3 1 2 3 4 6 IEEE STD 488 2 COMMON AND STATUS PROGRAM MESSAGES The PPC2 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 tha...

Страница 129: ... 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 enhanced Sent Query reply ESE 128 enables the PON bit 128 no reply if IEEE 488 Errors ERR 6 n is not valid ESR Purpose Read the Standard Event Register Command ESR Remarks The Standa...

Страница 130: ...marks This Query returns any registered option s installed in the PPC2 Each option is separated by a comma Possible options IEEE 488 0 ANALOG n The IEEE 488 option is installed The analog option is installed n is the revision on the analog option hardware from A to Z or if original revision Example enhanced Sent Reply OPT IEEE 488 0 ANALOG RST Purpose Resets the PPC2 control settings to factory se...

Страница 131: ...B Remarks The Status Byte Register reflects the general status of the PPC2 The MSS bit state is represented by bit 6 Example enhanced Sent Reply STB 80 The MSS and MAV bits are set RSE Purpose Read or set the Ready Status Enable Register Command Query RSE n RSE Default RSE 0 Arguments n 0 to 255 This is the decimal representation of the bit s to enable To enable the RDY bit the argument would be 1...

Страница 132: ...PPC2 Operation and Maintenance Manual 2001 DH Instruments Inc Page 124 8 89 9 ...

Страница 133: ... see Section 5 5 This section provides information on maintenance adjustment and calibration procedures certain repair functions and recommended overhaul procedures S K YZRS SMK ON Z O _ O O SXQ KXN WOK _ SXQ SX _WOX aS R KN KXMON YX LYK N POK _ O KXN P_XM SYX OPY O K _WSXQ RK _XObZOM ON LORK SY S MK_ ON Lc c OW NOPOM Y L OKUNYaX _ O RS WKX_KV KXN Y RO KSXSXQ PKMSVS SO Y LOMYWO RY Y_QRVc PKWSVSK a...

Страница 134: ...calized 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 for absolute RPTs 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 f...

Страница 135: ...YX RY_VN LO KUOX Y K YSN KMMSNOX KV ONS SXQ OO OM SYX XOa S NOVS O ON aS R 7 KV_O O Y dO Y KXN PY KVV KXQO RS NYO XY WOKX RK RO RK XY LOOX MKVSL K ON 0Y RO Y SQSXKV PKM Y c MKVSL K SYX 7 K O O Y dO Y KXN KXN Z S SVOQON PKM Y c MYOPPSMSOX K O _ ON PY MKVSL K SYX KNT_ WOX 5 2 1 2 SETTING ZNATERR Setting ZNATERR is necessary on absolute RPTs that will be used in the absolute measure mode if the AutoZ...

Страница 136: ...ducer readings with PA 0 and PM 1 Then applying the as received PA PM and ZOFFSET values to the readings calculates as received readings the readings that the transducer would have made with the old PA PM and ZOFFSET 3 S OMYWWOXNON RK K OMOS ON KV_O YP 7 KXN D900 PY KL YV_ O SP K_ YdO Y S _ ON SX XY WKV YZO K SYX LO OMY NON PY OKMR KXQO Z SY Y _XXSXQ RO MKVSL K SYX RO M_ OX 7 MKX LO SOaON Lc Z O S...

Страница 137: ...s see Section 3 4 1 Barometer accuracy should be 0 01 or better but its most important feature is stability over time Ideally the same barometer should be used to set ZNATERR and for subsequent running of the autozero function to update ZOFFSET RO OMYWWOXNON Y_ MO PY WOK _ SXQ K WY ZRO SM Z O _ O Y O D8 KXN PY _L O _OX K_ YdO YSXQ S K 23 7 7 Y 7 OPO OXMO Z O _ O WYXS Y YX KM 23 PY KNNS SYXKV SXPY ...

Страница 138: ...es Disk refer to Sections 5 2 1 PRINCIPLE 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 5 2 5 EDITING AND VIEWING RPT CALIBRATION INFORMATION m PURPOSE RPT calibration information fields include The calibration date The value of ZNATERR The value of PA The value of PM These fields can be viewed and or edited Viewing a...

Страница 139: ...VSPSON ZO YXXOV K ZK YP RO MKVSL K SYX Z YMO K_ SYX RY_VN LO KUOX Y K YSN KMMSNOX KV ONS SXQ OO OM SYX RO KV_O YP S KVaKc SX K MKV K RO KV_O YP 7 S NSWOX SYXVO 5 2 6 SETTING ZNATERR m 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 ...

Страница 140: ... OZK K SYX RY_VN LO O SOaON RY Y_QRVc m OPERATION A typical procedure for calibrating an RPT range is å Set up and prepare the PPC2 for calibration see Sections 5 2 2 5 2 3 From the main run screen using the RANGE function key select the reference transducer and 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...

Страница 141: ... 5 2 6 ù Calculate as left data for the calibration if desired following as left reading non corrected reading o new PM new PA 5 3 ADJUSTMENT OF ON BOARD BAROMETER m PURPOSE To adjust the output of the on board barometer see Section 1 2 2 2 m PRINCIPLE The on board barometer output can be adjusted using PA and PM values in the same manner as for the reference pressure transducers see Section 5 2 1...

Страница 142: ...irst turned ON or the analog input option range is changed and or every 30 minutes of operation The automated calibration uses an internal Adder and Multiplier to best fit the measurement range to the two points defined by the internal references The automated internal calibration function assures the stability over time of the analog measurement ranges relative to the highly stable internal refer...

Страница 143: ...measurements to agree with an external standard The Adder and Multiplier values can be changed through the front panel see Section 5 4 2 or by a remote command see Section 4 4 XOa aS R RO KXKVYQ SXZ_ YZ SYX S NOVS O ON aS R NNO KXN 7_V SZVSO KV_O O Y KXN PY KVV KXQO S O ROc RK O XY OPPOM RS NYO XY WOKX RK RO KXKVYQ SXZ_ YZ SYX RK XY LOOX PKM Y c MKVSL K ON 0Y RO Y SQSXKV MKVSL K SYX RO _ O NNO KXN...

Страница 144: ...gnificant changes in the time required to set a pressure excessive overshoot when setting a pressure and or hunting around the target value in dynamic control mode The configuration function is only designed to compensate for the small changes in pressure control hardware that may occur with normal wear over time Major changes to the pressure control hardware such as replacing a valve or pressure ...

Страница 145: ...ice once in each condition The next display is This display warns the user that pressure will increase to roughly 50 of range H3 Press ENTER to continue PPC2 will then pulse and set pressures around mid scale pressure and CFG will flash in the lower right corner of the display After about ten minutes the user will be asked whether or not to save the new configurations If the Cfg function ran compl...

Страница 146: ...ow through exhaust port when VENT is closed and test port at atmosphere is between 500 sccm and 1 5 slm Verify that internal barometer reads atmospheric pressure within 0 15 psi 1 kPa Perform system leak and operational check Perform calibration of reference pressure transducers if necessary 5 7 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY The PPC2 uses FLASH memory This allows the embedded softw...

Страница 147: ...UBASSEMBLY DESCRIPTION AND LOCATION 5 8 1 INTERNAL VIEW 1 Hi Reference Transducer 5 Driver Board 2 Lo Reference Pressure Transducer 6 Analog Board Optional 3 Pneumatic Module 7 On Board Barometer 4 Micro Card 8 Power Supplies 5V DC 12V DC Figure 12 Internal View 8 5 7 6 3 2 1 4 ...

Страница 148: ...ed by the micro card see Section 5 8 1 5 It supports the 12 V drivers for the internal and external solenoid valve actuation and the barometer board see Section 5 8 1 1 It also supplies power to the cooling fan 5 8 1 5 MICRO CARD The micro card supports a Motorola 68302 microcontroller EPROM EEPROM NVRAM and flash memories RS 232 communications IEEE 488 communications the front panel keypad and di...

Страница 149: ... designated the Lo RPT The Lo RPT is protected by an isolation valve and vented to atmosphere when not in use 5 8 1 7 PNEUMATIC MODULE The pneumatic module is an integrated assembly that includes two inlet fast and slow two exhaust fast and slow control valves vent valve and differential pressure regulators The differential pressure regulators use pressure feedback to maintain a constant different...

Страница 150: ...PPC2 Operation and Maintenance Manual 2001 DH Instruments Inc Page 142 8 89 9 ...

Страница 151: ...ypass of internal pressure controllers when pressure supply is connected and system is not vented or OFF None necessary if flow rate is normal If system is vented or OFF contact DHI Authorized Service Representative Measured pressure display has too much not enough resolution Resolution setting needs to be changed Use Res function to change resolution setting Section 3 3 2 The pressure units avail...

Страница 152: ...lecting a control mode using the CONTROL function Section 3 2 3 Pressure display is flashing and buzzer is sounding Current upper limit of active range has been exceeded Correct overpressure condition Change UL and or active range if needed Sections 3 2 4 3 2 1 Pressure display is flashing no buzzer is sounding and direct pressure control keys are inactive PPC2 has been overpressured pressure high...

Страница 153: ...ns at EXHAUST port Set ControlRef properly Section 3 3 1 Poor pressure control at pressures under atmosphere or inability to reach pressures under atmosphere Vacuum supply is incorrectly connected is not low enough or is unstable Correct vacuum supply Sections 2 3 5 3 3 1 Poor pressure control characterized by hunting around target Pneumatic control module needs to be reconfigured after checking a...

Страница 154: ...rect pressure supply Connect regulated pressure supply set to correct supply pressure Section 2 3 4 Poor pressure control and measurement The PPC2 and or the connection to the test system is contaminated with liquids Purge and clean affected systems Section 3 2 8 Apparent inaccurate pressure control measure and little or no response from reference transducer Reference transducer destroyed by overp...

Страница 155: ...ZSTD reference Section 3 4 1 Will not vent System is vented but does not indicate zero because measurement mode is absolute Check measurement mode setting and current value of atmospheric pressure if absolute Section 3 2 2 Will not vent VENT port is plugged Open VENT port to atmosphere Will not vent Vent valve not operating Have unit serviced Will not vent Purge function is activated but no SPLT i...

Страница 156: ...PPC2 Operation and Maintenance Manual 2001 DH Instruments Inc Page 148 8 89 9 ...

Страница 157: ... 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 one Amp Therefore if multiple drivers are being activated please refer to the following chart as a guide Table 19 Driver Output OF...

Страница 158: ...rnal Drivers EXTERNAL DRIVERS PIN DESCRIPTION A D1 Driver 1 Open Collector C D2 Driver 2 Open Collector E D3 Driver 3 Open Collector G D4 Driver 4 Open Collector M D5 Driver 5 Open Collector J D6 Driver 6 Open Collector K D7 Driver 7 Open Collector L D8 Driver 8 Open Collector B Drivers 12 V D Drivers 12 V F Drivers 12 V H Drivers 12 V Figure 14 Cable Schematic G E F L C D M H J K A B ...

Страница 159: ...IONS V power source These four pins provide common access to a 24 Volt power supply This power source can be used to power the analog equipment that is providing an analog signal to the PPC2 These pins can source up to 250 mA at 24 Volts Any combination of devices on the four channels can be powered by this source as long as their total draw is less than 250 mA at 24 Volts Power common These three...

Страница 160: ...06 inWa 4 C inch of water 4 014649 E 03 inWa 20 C inch of water 4 021732 E 03 inWa 60 F inch of water 4 018429 E 03 inHg 0 C inch of mercury 2 953 E 04 kcm 2 kilogram force per centimeter square 1 019716 E 05 user user User defined coefficient ft feet of altitude see Altitude Note below m meter of altitude see Altitude Note below Altitude Note Quantities expressed in units of altitude follow MIL S...

Страница 161: ...to be returned to DH Instruments or its authorized service provider after receiving authorization from DH Instruments 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 DH Instruments be liable to purchaser for any unforeseeable or indirect damage it being expressly stated th...

Страница 162: ...de Minerva I P M B V Handelsweg 13 Postbus 76 1270 AB Huizen NETHERLANDS Tel 31 35 52 54 887 Fax 31 35 52 64 560 minervaipm compuserve com European Union Nippon CalService Inc 2 9 1 Sengen Tsukuba Shi Ibaraki Prefecture 305 JAPAN Tel 0298 55 8778 Fax 0298 55 8700 aohte ohtegiken co jp Japan Asia DH Products Technical Service Division National Institute of Metrology Heat Division Pressure Vacuum La...

Страница 163: ...e static or dynamic pressure control Control Parameter Parameters affecting pressure control and the Ready Not Ready or 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 whe...

Страница 164: ...gh accuracy pressure measurement The RPT in a single RPT PPC2 or the higher pressure range RPT in a dual RPT PPC2 is referred to as the Hi or primary RPT 2 The lower pressure range RPT in a dual RPT PPC2 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 maximum range of the RPT in psi e g A0100 SPLT Self Purging Liquid Tr...

Страница 165: ... 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 corrected 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 ...

Страница 166: ...PPC2 Operation and Maintenance Manual 2001 DH Instruments Inc Page 158 8 89 9 ...

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