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Agilent Technologies 66lxxA User's Manual

1. ees 27 ccu eune p oll See cece ORE OUO QE IN REA GR AH 28 REPE EDI HERE RORIS 28 SUAM iri RERO rU Ee Un Deer E et reU Re RUE 29 ESR Biss sues o 29 hee been eoa bete mitte ae Rea 30 31 tu pero ssh ee etie esee te e e eo eb e oes 31 WAT cst n soak E UU eiue eU eU E 31 Description of Subsystem Commandis seen nennen rennen tenete trennen 31 Pig eR 31 Calibration Subsystem d ota t Et oe ipei tta Used tied RU Seat 32 CATZAUTO i et ER E e ai ec i e ee e ete 32 CATO CURR sS RRSREPRUORSGSseSOO RIESCO TERRI REGES 33 CAL CURR LEV iet prre RHENUS 33 UM se dsusehdendets 33 e ID LE 34 CATIZSTAT iu hee uH een vec ei emere 34 CAL VOLT enitn Ber Oe Em oU ees 34 CAL VOLT LEV zie E RU ERR UIERU NRI RU 34 CAT VOLT PROT notera ROBO cote beck eit AERA ME oe eG alerte etii 35 Current oii dns eeso au pue ht Bhs ed tette e mene 35 CURR nosci enbhenthest debet ebbe eei pure 35 CURREMODE 5 5 5 5 V Aedes entr e Ee e ree t Re e 35 CURR PROT STAT a oie BUN Ashen ce n Itt eu td uo EU eds 36 CURRITRIG eene PAUSAN BOE aer A ds 36 DISP ST
2. E E A 49 Index 113 IMP EHE CE 50 reset state see RST state ai tr EE RI Pee HERE ER T 10 RI configuration switch for see Chapter 2 in User s Guide description of e dee eroe ente ae edd n ae pe ERE 62 digital connector pins for see Chapter 3 in Installation Guide examples of use see Chapter 4 in User s Guide example of wiring see Chapter 3 in Installation Guide RI Questionable Status bit eere E E 41 45 52 signal electrical characteristics see Chapter 1 in Installation Guide Jedi celi 12 Dind 29 30 52 53 55 RST States cen Ohne De rera CREE 28 50 RIG pulse RE PROF PERDU tere NER ERU SEHR 50 60 63 S saved parameters Se 29 naue Rue Une LU Eee Ha 9 confirmed commands tnmen mou Bru 67 MCI 49 67 secondary address see GPIB address sequential commands Bais is ides Rails eben Gaia Sete 63 serial e muere peg 4 3 SETUP BAS SpE AEE EE N e a hee AEE 2 8 SRO A E E ce osha E E O S 27 30 54 55 STCO pulse E E UI a A e Ug RM ERU E 43 50 60 STS
3. 54 Initial Conditions at Power 55 Status Registers ODER CUORE UT DRESD EE 55 The PON Brt ht eee t epe e or e o eene eee 55 Exainples noto eR Pep re UD ree ERU Ue Pus 55 Servicing an Operation Status 55 Adding More Operation Events eto orbe 56 Servicing Questionable Status nene nne ener enne 56 Monitoring Both Phases of a Status Transition 56 Synchronizing Power Module Output Changes Heim M 57 Bop epu ives 57 Model of Fixed Mode Trigger 57 Idle State rete trece p PD e RE bee ee pep hide 58 State ese eR Oen d Or ene Uii tmn ras 58 Delaying State nete eee D Re ect ete be pec CIR bre ea 58 Output Change State ss uc es a a aee aspe 59 Model of List Mode Trigger Operation esses eene 59 Output Change State nde eere mon te e teet eden eie eren 59 Dwelling State D e e EEE EEE TEE E a EEEE EE e RE A E 59 The INIT CONT Function ie insiens A E E Eo UM RH en SE eerie ds 59 Trigger Status and Event Signals nee et
4. 44000400110 test tenen nennen rests tenet 17 General Setup Information for GWBASIC sees 17 Using the Agilent 82335A 82990A 16062B GPIB Command Library eee 17 Using the National Instruments GPIB Interface 18 General Setup Information for Microsoft nennen 18 Using the Agilent 82335A 82990A 16062B GPIB Command Library 18 Using the National Instruments GPIB Interface 2 18 Sending Commands to and Receiving Data from the Module sese 19 Language Dictionary IntroductlOB ore RIINAVOU REI OMRDERI DU ER 23 Parameters eret eet EEE vette cue 23 Order OF Presentation 2e E a e epe ident pee 23 Common Commands sese penetret tiere rein one p HP ere DURER 23 subsystem Commands re etd iA eae itor E en eme ite ees eee tee ed i er 23 Description of Common Commands 24 ODS ee Se Re ette edt 24 ESE entere ORE epe IO HO Pr Depp itte OH ds 25 ee Uere 25 NIDIN Siro SIRO RU eU diti uM 26 CREER Relea sets chek ahs meae dens 26 OPQ is nene oe DOR e EROR me pH PD 26 olde e N 27
5. E Re eat tee tede m ees 49 Link Parameter lat nein one Dane pene p TROP p ie Pueri ede 50 Power Module Programming Parameters eese eterne ener eene renes 50 4 Status Reporting P wer Module Status Structure cito tereti et ed ea Ue dieit ente ist 51 Status Register Bit Configuration enne eene ennet rennen erret trennen nennen nen 51 Operation Status Group pee ee e See Pee p dera ipee ae 51 Register Functions enne D BRUDER ORE Te UR GU ERE ER Rena 51 Register Commands eene it prier e po eite tie dete e pp pi pte 51 Questionable Status Group ic ter ttr e tee Eee reU e rite unseat bei eee teeth 52 Register Functions esee rei euh RE Heer etr P MISERE IR ESS 52 Register Commands oen che Re ERR E e 52 Standard Event Status GTOUD tp een t deep Urt RO I pe eR 53 Register F nctions iic tette eee Ee Re ea Ee eR utes 53 Register Commands se ifs e eee RS OAS Rae A aS Gh ee eh 53 status Byte Register eese ined Re ord e DOR UP ORO OT ORI Ro t renting 54 Eds 54 The MSS Bit eene IG s eH a Veri t ae mus 54 Determining the Cause of a Service 6 54 Output Queue pe etr e ete atero rede ota nere iere terra better 54 Location of Event Handles aaro
6. VSTART VSTOP VSTART 20 1 CALCULATES VOLTAGE LIST POINTS NEXT I NOTE REGARDING GPIB READ WRITE TERMINATIONS THE DEFAULT MODE OF THE INTERFACE CARD IS THAT EOIIS ENABLED AND THE READ WRITES TERMINATE ON CARRIAGE RETURN LINE FEED THE MODULE TERMINATES ON EITHER EOIOR LINE FEED SOTHE DEFAULT SETTINGS OF THE CARD ARE SUFFICIENT CMD RST CLS STATUS PRESET RESET AND CLEAR MODULE L LEN CMD CALL IOOUTPUTS SLOTO CMD L IF PCIB ERR lt gt 0 THEN ERROR PCIB BASERR 4 Application Programs 99 1340 1350 1360 1370 1380 1390 1400 1410 1420 1430 1440 1450 1460 1470 1480 1490 1500 1510 1520 1530 1540 1550 1560 1570 1580 1590 1600 1610 1620 1630 1640 1650 1660 1670 1680 1690 1700 1710 1720 1730 1740 1750 1760 1770 1780 1790 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 1910 1920 1930 CMD VOLT STR VSTART L LEN CMD CALL IOOUTPUTS SLOTO CMD L F PCIB ERR 20 THEN ERROR PCIB BASERR START RAMP AT VSTART USE NUMBER TO STRING CONVERSION TO SEND REAL NUMBERS OVER THE BUS 5 PART OF THE COMMAND STRING 4 CMD CURR 1 L LEN CMD CALL IOOUTPUTS SLOTO CMD L PCIB ERR lt gt 0 THEN ERROR PCIB BASERR CMD OUTPUT ON L LEN CMD CALL IOOUTPUTS SLOTO CMD L PCIB ERR lt gt 0 THEN ERROR PCIB BASERR ENABLE OUTPUT 4 CMD VOLT MODE LIST L LEN CMD CALL IOOUTPUTS S
7. teste bn ied ede det ue 49 59 inanuals Series 66I1XXA aaa aT WR Gee ERU 7 MAV DIt reret RR m r 30 50 52 54 MESSAGES terminator penre eei a E E A T EER e 12 iu PIE 10 112 Index MESSAGES UNILSEPALALOLs EE 12 Message units combining epe eid ee A ep ege tp ope epe repertus 10 MICITOSOLU oie E Ami Mena met it et 18 19 modul adentifiCatIony e bo vere e Peer eere ree E bo eere ceo eee 26 BIN PP P 27 MSS bit eH a SUO NR Ve eR Rer 29 30 52 54 N National Instruments DOS driver 18 non SCPI commands eene eee ce eere Pec esce e eden 67 ER EE 26 28 29 30 ced esa eek hia eases aaa es T omes uiri enean oU davor ein a EN 15 NREPS uns emisse Dm S tM Eb iE 15 OGL DI 36 41 45 56 OEP nei UHIeneed ee eae e IU emu eee 36 41 bit nett DIO REDE t HE Oe CREER 25 26 41 52 63 72 74 OPER bit eterne UR OR ttn Uie e bete 30 45 50 52 55 56 OT bi
8. Command Syntax OUTPut TTLrg LINK lt CRD gt Parameters See Table 3 I RST Value OFF Examples OUTP TTLT LINK CC OUTP TTLT LINK OFF Query Syntax OUTPut TTLrg LINK Returned Parameters See Table 3 1 Related Commands OUTP TTLT SOUR OUTP TTLT STAT OUTP TTLT SOUR This command selects the signal source for the Trig Out signal as follows BUS TRG or lt GET gt Group Execute Trigger HOLD trigger source except TRIG IMM EXT Mainframe backplane Trigger In bus LINK Internal power module event as specified by TRIG LINK When an event becomes true at the selected TTLTrg source a pulse is sent to the BNC connector on the rear of the mainframe Command Syntax OUTPut TTLrg SOURce lt CRD gt Parameters BUS EXTernal LINK HOLD RST Value BUS Examples OUTP TTLT SOUR LINK Query Syntax OUTPut TTLrg SOURce Returned Parameters BUS EXT LINK HOLD Related Commands OUTP TTLT LINK OUTP TTLT STAT Status Subsystem This subsystem programs the power module status registers The power module has three groups of status registers Operation Questionable and Standard Event The Standard Event group is programmed with Common commands as described in Chapter 4 Status Reporting The Operation and Questionable status groups each consist of the following five registers Condition Enable Event NTR Filter PTR Filter 42 Language Dictionary Status Operation Registers The bit configuration of all Status Operation registers
9. reete e EVE REPE PERF 49 60 63 SUMS bit dette dean pO Ge cette iain baee etant 49 T ju ELS 49 60 63 tree diagram nane eR 31 32 Trigger M wwn 60 trigger delay C 58 fixed mode RR Ime RR WI 58 IDitiatiDg ep pee re p Dno ODE 58 hst mode eo recie eerte eei ee 58 59 60 fixed o eun EIGENEN EGG 58 nre RS 59 U units see data suffix UNR DIt eb EEUU E a i ee ee RA OE Giese ats athe a neha eee ei 45 52 W btt 525 ogedbhe Cvm D RED UE pP eR 32 43 47 52 59 105 114 Index Agilent Sales and Support Offices For more information about Agilent Technologies test and measurement products applications services and for a current sales office listing visit our web site http www agilent com find tmdir You can also contact one of the following centers and ask for a test and measurement sales representative United States Agilent Technologies Test and Measurement Call Center P O Box 4026 Englewood CO 80155 4026 tel 1 800 452 4844 Canada Agilent Technologies Canada Inc 5150 Spectrum Way Mississauga Ontario L4W 5G1 tel 1 877 894 4414 Europe Agilent Technologies Test amp Measurement European Marketing Organisation P O Box 999 1180 AZ Amstelveen The
10. 108 Application Programs firiderr fF Indicates that ibfind failed printf Ibfind error Does device name given match configuration name n error bad string FK Thisis a generalized error checking routine char bad string print GP IB error while sending or receiving s n bad string printf GP IB status ibsta 0 0x x ibcnt Ox96xW ibsta ibcnt Application Programs 109 A A cmd 15 x tonne se Ni ence nein sees 7 8 23 51 54 64 SA BRUM EM 43 52 calibration password dioe Eee rte oin bs tute eects create Seabee lo ee e ttes d 33 CC DIE asi dro SIR ted 43 50 52 56 commands BERNER 10 14 23 24 vont 64 diagram see tree diagram overlapped RERSAG UE SUeN Pe Seca RHENUS E 26 64 felated site tiec iuste Tee tabs asco Ie 23 eis 25 52 EOD E 15 CV bit aciei 43 50 52 55 D data bt n 15 ch racter anne RR GG RH Rr RR Wear e 15 multiplier RI PR REED PR DP REP 15 TNUIMOTICALS osc 14 FS D U D D D RES
11. 32 5 Les eres 5 64 9 SE EI qt CME 2 32 28 PON Li 128 OPERATION STATUS OUTPUT QUEUE CONDITION PTR NTR EVENT ENABLE plici CAL 2 24 D WTG 2 E 4 8 8 256 NU 512 T 8 9 O v2 i we 2 FI64 1 GAL NU CONDITION PTRINTR EVENT ENABLE PTR NTR EVENT ENABLE 0 1 1 23 NU 5 8 512 9 oz 11 15 ee ee STAWI C STATUS EVENT HANDLE CC CV ESB OPC OPER QUES ROS DWE SUM3 Location 00000 00000 LOGICAL 9 SERVICE REQUEST ENABLE STATUS BYTE N U 0 2 QUES 3 ST EVENT ENABLE LOGICAL OR Figure 4 1 Power Module Status Model Standard Event Status Group Register Functions This group consists of an Event register and an Enable register that are programmed by COMMON commands The Standard Event register latches events relating to interface communication status see Table 4 2 It is a read only register that is cleared when read The Standard Event Enable register functions similarly to the enable registers of the Operation and Questionable status groups Register Commands The common ESE command programs specific bits in the Standard Event Status Enable register Because the power module implements PSC the register is cleared at power on if PSC ESR reads the Standard Event Status Event register Reading the register cle
12. Programming Guide Agilent Technologies Series 66IxxA MPS Power Modules LE Agilent Technologies Agilent Part No 5959 3362 Printed in USA September 1997 Microfiche Part No 5959 3363 Update April 2000 Safety Guidelines The beginning of the Users Guide for GPIB Power Modules Series 6 has a Safety Summary page Be sure you are familiar with the information on that page before programming the power module for operation from a controller Printing History The current edition of this guide is indicated below Reprints of this guide containing minor corrections and updates may have the same printing date New editions are identified by a new printing date and in some cases by a new part number A new edition incorporates all new or corrected material since the previous edition Changes to the guide occurring between editions are covered by change sheets shipped with the guide Edition 1 October 1991 Edition 2 February 1992 Update August 1992 Update February 1993 Edition 3 September 1997 Update April 2000 Copyright 1991 1992 1997 Agilent Technologies Inc This document contains proprietary information protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated into another language without the prior consent of Agilent Technologies The information contained in this document is subject to chan
13. RST CLS STATUS PRESET OUTPUT Slot2 CURR 5 OUTPUT Slot2 VOLT 5 OUTPUT Slot2 VOLT TRIGGERED 0 OUTPUT Slot2 TRIGGER SOURCE TTLTRG OUTPUT Slot2 INITIATE OUTPUT Slot2 OUTPUT TTLTRG SOURCE LINK OUTPUT Slot2 OUTPUT TTLTRG LINK OUTPUT Slot2 OUTPUT TTLTRG STATE ON OUTPUT Slot2 OUTPUT ON SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 00 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 01 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 02 RESET AND CLEAR MODULE START AT 15V GO TO 0V ON TRIGGER TRIGGER SOURCE IS TTL TRIGGER 15 ms TRIGGER DELAY ENABLE RESPONSE TO TRIGGER GENERATE A BACKPLANE TTL TRIGGER WHEN A CV TO CC TRANSITION OCCURS ENABLE TTL TRIGGER DRIVE ENABLE OUTPUT RESET AND CLEAR MODULE START AT 15V GO TO 0V ON TRIGGER TRIGGER SOURCE IS BACKPLANE TTL TRIGGER 15 ms TRIGGER DELAY ENABLE RESPONSE TO TRIGGER GENERATE A BACKPLANE TTL TRIGGER WHEN A CV TO CC TRANSITION OCCURS ENABLE TTL TRIGGER DRIVE ENABLE OUTPUT RESET AND CLEAR MODULE STARTAT5V GO TO 0V ON TRIGGER TRIGGER SOURCE IS BACKPLANE TTL TRIGGER ENABLE RESPONSE TO TTL TRIGGER GENERATE A BACKPLANE TTL TRIGGER WHEN A CV TO CC TRANSITION OCCURS ENABLE TTL TRIGGER DRIVE ENABLE OUTPUT THE POWER MODULES ARE NOW SET UP TO IMPLEMENT THE POWER DOWN ON EVENT ANY TIME ANY MODULE GOES INTO CC THE SEQUENCE WILL OCCUR END Figure B2 3 Agilent BASIC Program Listing for Application 2 Application Programs
14. regardless of the actual terminator character 12 Introduction To Programming Traversing the Command Tree Figure 2 2 shows a portion of the subsystem command tree you can see the complete tree in Figure 3 2 Note the location of the ROOT node at the top of the tree The SCPI interface is at this location when The power module is powered on A device clear DCL is sent to the power module The interface encounters a message terminator The interface encounters a root specifier ROOT OUTP STAT PROT CLE L DEL REL EE STAT POL STAT LEVEN B COND Figure 2 2 Partial Command Tree Active Header Path In order to properly traverse the command tree you must understand the concept of the active header path When the power module is turned on or under any of the other conditions listed above the active path is at the root That means the interface is ready to accept any command at the root level such as OUTPUT or STATUS in Figure 2 2 Note that you do not have to proceed either command with a colon there is an implied colon in front of every root level command If you enter OUTPUT the active header path moves one colon to the right The interface is now ready to accept STATE PROTECTION or RELAY as the next header Note that you must include the colon because it is required between headers If you now enter PROTECTION the active path again moves one colon to the right The int
15. CURR LEV TRIG AMPL SOUR CURR LEV TRIG AMPL SOUR CURR MODE SOUR CURR MODE SOUR CURR PROT STAT SOUR CURR PROT STAT SOUR LIST COUN SOUR LIST COUN SOUR LIST CURR SOUR LIST CURR POIN SOUR LIST DWEL SOUR LIST DWEL POIN SOUR LIST STEP SOUR LIST STEP SOUR LIST VOLT SOUR LIST VOLT POIN SOUR VOLT LEV IMM AMPL SOURI VOLT LEV IMM AMPL SOUR VOLT LEV TRIG AMPL SOUR VOLT LEV TRIG AMPL SOUR VOLT MODE SOUR VOLT MODE SOUR VOLT PROT LEV SOUR VOLT PROT LEV SYST ERR SYST VERS TRIG STAR IMM TRIG DEL TRIG DEL TRIG LINK TRIG LINK TRIG SOUR TRIG SOUR CLS ESE ESE ESR IDN OPC OPC PSC PSC RCL RST SAV SRE STB TRG TST SCPI Approved Commands None SCPI Conformance Information 67 Non SCPI Commands CAL CURR OUTP DFI SOUR CAL PASS OUTP REL STAT CAL SAVE OUTP REL STAT CAL VOLT OUTP REL POL OUTP DFI STAT OUTP REL POL OUTP DFI STAT SOUR LIST STEP OUTP DFI LINK SOUR LIST STEP OUTP DFI LINK SOUR VOLT SENS OUTP DFI SOUR 68 SCPI Conformance Information Application Programs This section contains seven example applications For each application there is The following Application 1 Application 2 Application 3 Application 4 Application 5 Application 6
16. CURR PROT STAT OUTP DFI STAT OUTP TTLT LINK VOLT MODE DISP STAT OUTP DFI LINK OUTP TTLT SOUR VOLT PROT LEV INIT CONT OUTP PROT DEL TRIG DEL Command Syntax SAV Parameters 0 to 9 Query Syntax None Related Commands PSC RCL RST SRE Meaning and Type Service Request Enable Device Interface Description This command sets the condition of the Service Request Enable register This register determines which bits from the Status Byte register see STB for its bit configuration are allowed to set the Master Status Summary MSS bit and the Request for Service RQS summary bit A Z in any Service Request Enable register bit position enables the corresponding Status Byte register bit and all such enabled bits then are logically ORed to cause Bit 6 of the Status Byte register to be set See Chapter 4 Status Reporting for more details concerning this process When the controller conducts a serial poll in response to SRQ the RQS bit is cleared but the MSS bit is not When SRE is cleared by programming it with 0 the power module cannot generate an SRQ to the controller Command Syntax SRE lt NRf gt Parameters 0 to 255 Default Value See PSC Example SRE 20 Query Syntax SRE Returned Parameters NR1 Register binary value Related Commands ESE ESR PSC Language Dictionary 29 If PSC is programmed to 0 then the SRE command causes a write cycle to nonvolatile memory The nonvolatile memory has a finite number of write
17. EM Trigger Delay Figure B2 2 Timing Diagram of Application 2 Application Programs 10 20 30 40 50 60 10 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 210 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 APPLICATION 2 SEQUENCING MULTIPLE MODULES TO POWER DOWN ON EVENT PROGRAM APP 2 ASSIGN Slot0 TO 70500 ASSIGN Slotl To 70501 ASSIGN 85102 TO 70502 ISET UP MODULE IN SLOT 0 AS 15 V BIAS SUPPLY OUTPUT Slot0 RST CLS STATUS PRESET OUTPUT QSlotO CURR 5 OUTPUT Slot0 VOLT 15 OUTPUT Slot0 VOLT TRIGGERED 0 OUTPUT Slot0 TRIGGER SOURCE TTLTRG OUTPUT 95 00 TRIGGER DELAY 015 OUTPUT QSlotO INITIATE OUTPUT Slot0 OUTPUT TTLTRG SOURCE LINK OUTPUT Slot0 OUTPUT TTLTRG LINK OUTPUT Slot0 OUTPUT TTLTRG STATE ON OUTPUT Slot0 OUTPUT ON UP MODULE IN SLOT 1AS 15 V BIAS SUPPLY OUTPUT Slotl RST CLS STATUS PRESET OUTPUT Slotl CURR 5 OUTPUT Slotl VOLT 15 OUTPUT Slotl VOLT TRIGGERED 0 OUTPUT Slotl TRIGGER SOURCE TTLTRG OUTPUT Slotl TRIGGER DELAY 015 OUTPUT Slotl INITIATE OUTPUT Slotl OUTPUT TTLTRG SOURCE LINK OUTPUT Slotl OUTPUT TTLTRG LINK OUTPUT Slotl OUTPUT TTLTRG STATE ON OUTPUT Slotl OUTPUT ON UP MODULE IN SLOT 2 AS 5 V BIAS SUPPLY OUTPUT Slot2
18. LIST VOLTAGE Minus 12v Q Slot LIST DWELL Dwell Slot2 LIST STEP ONCE Slot2 TRIGGER SOURCE TTLTRG Slot2 INITIATE THESE ARE THE BIAS SUPPLY LIMIT CONDITIONS TO BE TESTED NUMBER OF BIAS SUPPLY LIMIT COMBINATIONS SECONDS OF DWELL TIME SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 00 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 01 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 02 RESET AND CLEAR MODULE START AT OV ENABLE OUTPUT SET TO GET VOLTAGE FROM LIST DOWNLOAD VOLTAGE LIST POINTS DOWNLOAD DWELL TIME ASSUMES SAME FOR ALL POINTS EXECUTE 1LIST POINT PER TRIGGER TRIGGER SOURCE IS GPIB BUS GENERATE BACKPLANE TTL TRIGGER WHEN GPIB BUS TRIGGER IS RECEIVED ENABLE TTL TRIGGER DRIVE ENABLE RESPONSE TO TRIGGER RESET AND CLEAR MODULE STARTATOV ENABLE OUTPUT SET TO GET VOLTAGE FROM LIST DOWNLOAD VOLTAGE LIST POINTS DOWNLOAD 1 DWELL TIME ASSUMES SAME FOR ALL POINTS EXECUTE 1LIST POINT PER TRIGGER TRIGGER SOURCE IS BACKPLANE TTL TRIGGER ENABLE RESPONSE TO TRIGGER RESET AND CLEAR MODULE STARTATOV ENABLE OUTPUT SET TO GET VOLTAGE FROM LIST DOWNLOAD VOLTAGE LIST POINTS DOWNLOAD 1 DWELL TIME ASSUMES SAME FOR ALL POINTS EXECUTE 1LIST POINT PER TRIGGER TRIGGER SOURCE IS BACKPLANE TTL TRIGGER ENABLE RESPONSE TO TTL TRIGGER BEFORE TRIGGERING THE MODULES DETERMINE IF THE MODULES ARE READY BY CHECKING FOR WAITING FOR TRIGGER 5 OF THE OPERATION STATUS REGISTER IF THE LA
19. The query statement returns only the state not the password Whenever the calibration mode is changed from enabled to disabled any new calibration constants are lost unless they have been stored with CAL SAVE Command Syntax CALibrate STATe lt bool gt lt NRf gt Parameters 01 OFF 1 ON lt NRf gt RST Value OFF Examples CAL STAT 1 66102 CAL STAT OFF Query Syntax CALibrate STATe Returned Parameters 011 Related Commands CAL VOLT CAL PASS CAL SAVE This command can only be used in the calibration mode It enters a voltage value that is obtained from an external meter You must first select a calibration level CAL VOLT LEV for the value being entered Two successive values one for each end of the calibration range must be selected and entered The power module then computes new voltage calibration constants These constants are not stored in nonvolatile memory until saved with the CAL SAVE command Command Syntax CALibrate VOLTage DATA lt NRf gt Parameters See Table 3 2 Default Suffix V Examples CAL VOLT 310 0 MV CAL VOLT 5 000 Query Syntax None Related Commands CAL VOLT LEV CAL SAVE CAL STAT This command can only be used in the calibration mode It sets the power module to a calibration point that is then entered with CAL VOLT DATA During calibration two points must be entered and the low end point MIN must be selected and entered first Command Syntax Parameters Examp
20. value 32 int slot0 FK Device number of module in slot 0 5100 is configured in GPIB Com as GPIB address 5 secondary address 96 main char cmd FK Used to hold command strings sent to the module char cmd LENT Used to hold command strings during string manipulations char vpoin SMALL STRING Used to hold the string equivalent of one voltage ramp step char 5 Used to hold the entire voltage List command header and points char condition datalSMALL STRING Reserve space for reading back status conditions inti fF Loop counter float vstart 2 0 F Start voltage for the ramp float vstop 10 0 FK Stop voltage for the ramp float ramptime 0 5 Transition time for the ramp float dwell Dwell time for each ramp step dwell ramptime 19 0 FK Since the output stays at the last voltage point after its dwell expires the dwell time of the last point is not part of the transition time Therefore divide the total time by 19 points not 20 You want the same dwell time for every point in the List so only download 1 dwell time if slot ibfind SLOTO lt 0 X Assign unique identifier to the device 5100 and store in finderr fF variable 51010 Error negative value returned cmd RST CLS STATUS PRESET fF Resetand clear module ibwrt slot0 cmd strlen cmd if ibsta amp ERR error cmd sprintf cm
21. Application 7 An overview of the application Which MPS features are used to implement the application The advantages and benefits of the MPS solution The details of the implementation of the solution A block diagram of the setup A sample program listing in Agilent BASIC A description of variations on the application table lists what MPS features are used in each of the applications It can be used as an index into this section Sequencing Multiple Modules During Power Up Sequencing Multiple Modules to Power Down on Event Controlling Output Voltage Ramp Up at Turn On Providing Time Varying Voltages Providing Time Varying Current Limiting Output Sequencing Paced by the Computer Output Sequencing Without Computer Intervention Application 3 1 2 3 4 5 0 T Lists 20 point current List 20 point voltage List Repetitive Lists Dwell time je je o List Pacing Dwell paced Lists Trigger paced Lists Actions Due To A Change In Status Generate an SRQ Generate a trigger Disable the output Stop the List Triggers Change the voltage on trigger e Trigger in out from MPS backplane TTL Trigger Trigger on a GPIB trigger command Trigger delay Other Features Active downprogramming Overcurrent protection Application Programs 69 Application 1 Sequencing
22. CLEAR MODULE STARTATOV GO TO 5V ON TRIGGER TRIGGER SOURCE IS BACKPLANE TTL TRIGGER 50 ms TRIGGER DELAY ENABLE OUTPUT ENABLE RESPONSE TO TRIGGER BEFORE TRIGGERING THE MODULES DETERMINE IF THE MODULES ARE READY BY CHECKING FOR WAITING FOR TRIGGER BIT 5 OF THE OPERATION STATUS REGISTER IF THE LAST MODULE PROGRAMMED IS READY THEN SO ARE THE OTHERS SO JUST CHECK SLOT 2 YOU COULD ELIMINATE THIS STEP BY SIMPLY INSERTING A PAUSE IN THE PROGRAM HOWEVER BY CHECKING THE INSTRUMENT STATUS YOU CAN AVOID TIMING PROBLEMS ALSO ANY OTHER OPERATIONS THAT TAKE TIME WILL GIVE THE MODULES A CHANCE TO COMPLETE PROCESSING REPEAT OUTPUT Q Slot2 S TATUS OPERATION CONDITION ENTER Slot2 Condition_data UNTIL BIT Condition_data 5 TEST FOR 5 TRUE I TRIGGER MODULE IN SLOT 0 TO BEGIN SEQUENCING THE 3 MODULES TO POWER UP OUTPUT Slot0 TRG SEND Agilent 1B BUS TRIGGER END Figure B1 3 Agilent BASIC Program Listing for Application 1 Application Programs 73 Application 2 Sequencing Multiple Modules to Power Down on Event Overview Of Application When testing devices such as some GaAs and ECL devices that are sensitive to when bias voltages are removed the order of power down of multiple power modules can be controlled The power down sequence can be initiated by an event such as a change in power module status fault condition detection of a TTL signal etc For this example there are three supplies 5 V
23. Command Syntax Parameters Suffix Default Value Example Query Syntax Returned Parameters Related Commands SYST ERR STATus QUEStionable NTRansition lt NRf gt STATus QUEStionable PTRansition lt NRf gt 0 to 32727 None 0 STAT QUES NTR 16 STAT QUES PTR 512 STATus QUEStionable NTRansition STATus QUEStionable PTRansitiion lt NRI gt Register value STAT QUES ENAB This query returns the next error number followed by its corresponding error message string from the remote programming error queue The queue is a FIFO first in first out buffer that stores errors as they occur As it is read each error is removed from the queue When all errors have been read the query returns 0 NO ERROR If more errors are accumulated than the queue can hold the last error in the queue is 350 TOO MANY ERRORS Query Syntax Parameters Returned Parameters Example SYST VERS SYSTem ERRor None lt NR1 gt lt SRD gt SYST ERR This query returns the SCPI version number to which the power module complies The returned value is of the form YYYY V where YYYY represents the year and V is the revision number for that year Query Syntax Parameters Returned Parameters Example Related Commands Trigger Subsystem SYSTem VERSion none lt NR2 gt SYST VERS None This subsystem controls the triggering of the power module See Chapter 5 Synchronizing Power Module Output Changes for an explanation of the Trigger
24. Commands STAT QUES NTR PTR Commands STATus QUEStionable ENABle lt NRf gt 0 to 32727 None 0 STAT QUES ENAB 18 STATus QUEStionable ENABle NRI Register value STAT QUES EVEN These commands allow the values of the Questionable NTR Negative Transition and PTR Positive Transition registers to be set or read These registers serve as polarity filters between the Questionable Enable and Questionable Event registers to cause the following actions When a bit of the Questionable NTR register is set to 1 then a 1 0 0 transition of the corresponding bit of the Questionable Condition register causes that bit in the Questionable Event register to be set When a bit of the Questionable PTR register is set to 1 then a 0 to I transition of the corresponding bit in the Questionable Condition register causes that bit in the Questionable Event register to be set If the same bits in both NTR and PTR registers are set to 1 then any transition of that bit at the Questionable Condition register sets the corresponding bit in the Questionable Event register If the same bits in both NTR and PTR registers are set to 0 then no transition of that bit at the Questionable Condition register can set the corresponding bit in the Questionable Event register Note Setting a bit in the PTR or NTR filter can of itself generate positive or negative events in the corresponding Questionable Event register Language Dictionary 45
25. Examples MEAS CURR MEAS VOLT MEASURE VOLTAGE DC MV Returned Parameters lt NR3 gt Related Commands CAL AUTO Output Subsystem This subsystem controls the power module voltage and current outputs and the optional output relay OUTP This command enables or disables the power module output The state of a disabled output is a condition of zero output voltage and a model dependent minimum source current If the power module is configured to use the relay option the command opens the relay contacts when the output is disabled and closes them when it is enabled Transitions between the output ON and OFF states are sequenced so that the relay is switched while the power mesh is disabled Use of the second NORelay parameter prevents the command from having any effect on the relay it remains in its existing state when OUTPut is executed The query form returns the output state excluding that of the relay see OUTP REL Language Dictionary 39 Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands OUTP DFI OUTPut STATe lt bool gt NORelay 0 OFF NORelay 1 ON NORelay 0 OUTP 1 OUTP STAT ON NORELAY OUTPut STATe 011 RCL SAV This command enables or disables the discrete fault indicator DFI signal to the power module backplane Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands OUTP DFI LINK OUTPut DFI ST
26. For this example the power module must provide the repetitive waveform shown in Figure B4 1 This time varying voltage will be applied to a hybrid IC By continually cycling the voltage from 0 to 7 volts over a 33 second interval the hybrid is given time to heat up and undergo thermal and mechanical stress as the welds inside the hybrid expand and contract and then subsequently cool down Stress and Burn in Normal pr 7 VN Operation o m Time in seconds Computer trigger End of cycle command repeats indefinitely starts cycling Figure B4 1 Voltage Waveform for Application 4 In addition to generating the cyclical voltage it is desirable to have the power module notify the computer should the device fail and stop the cycling Since the module is monitoring test status the computer is free to perform other tests The MPS can address this application using dwell paced repetitive Lists This application could be thought of as a simple power arbitrary waveform generator To get the desired time varying voltage you must be able to describe the waveform in 20 discrete voltage points with each point ranging from 10 ms to 65 seconds This range of dwell times determines the range of frequencies or time rate of change of the voltage waveform to be generated Once the waveform has been described it is downloaded to the module Upon being triggered it will repetitively generate the waveform without computer interventio
27. Netherlands tel 31 20 547 9999 Japan Agilent Technologies Japan Ltd Measurement Assistance Center 9 1 Takakura Cho Hachioji Shi Tokyo 192 8510 Japan tel 81 426 56 7832 fax 81 426 56 7840 Technical data is subject to change 115 Latin America Agilent Technologies Latin American Region Headquarters 5200 Blue Lagoon Drive Suite 950 Miami Florida 33126 U S A tel 305 267 4245 fax 305 267 4286 Australia New Zealand Agilent Technologies Australia Pty Ltd 347 Burwood Highway Forest Hill Victoria 3131 tel 1 800 629 485 Australia fax 61 3 9272 0749 tel 0 800 738 378 New Zealand fax 64 4 802 6881 Asia Pacific Agilent Technologies 24 F Cityplaza One 1111 King s Road Taikoo Shing Hong Kong tel 852 3197 7777 fax 852 2506 9284 Manual Updates The following updates have been made to this manual since the print revision indicated on the title page 4 15 00 All references to HP have been changed to Agilent references to HP IB have been changed to GPIB Information about VXIPlug amp Play instrument drivers has been added to chapter 1
28. PE EAE e e es fe 12 LOM SPOT LC 11 optional iet PRESE Ree ER gua oleate eno aie Ie RET Eee 12 13 poo 13 IDE 12 ShOFt eee Ee er ei 11 GPIB address PRELIM ALY DET EE 9 11 17 18 VOCARE 9 17 18 ee eee 9 Agilent ERE URBI OH APR 17 18 19 GPIB capabilities inerte te eter rie E babes eiie Ea beet Ec E 9 IEEE see ANSI IEEE INH input see RI ba RE 28 37 60 I SEQ BEC I EI 54 K keyboard operation see User s Guide keyword see header L language SCPI see SCPI hnk paraimetefs tae sh she des ide IN 50 local lockout command 66 lt 4 lt 7 localsense switch 48 lg 61 commands rete etse eite ete teris uet bep pe ee 35 37 38 39 48 dwell paced ene pup eeEOhe DR T petens epe re 62 nori c R 61 programming ioo oe RD o REIHE E reb en euh re Ue e s 61 SEQUENCING ead RE Re den Nee Head eu nens 61 tH Ser Paced te eR eO e RU FO AM eats pr OR DOT 62 TES
29. a VOLT LEV IMM or CURR LEV IMM command during an interval will override the list output value for that interval When the next interval begins the output will be determined by the list value for that interval Automatically Repeating a List You can repeat a list by entering a LIST COUNt parameter The parameter determines how many times a list is executed or sequenced Enter an integer or enter the value INF to make the list repeat indefinitely For example to make the current list 2 3 12 15 repeat 5 times send LIST CURR 2 3 12 15 LIST COUN 5 The LIST COUNt parameter is stored by SAV and restored by RCL The GPIB RST value is 1 Triggering a List No list will execute without a trigger How the list responds to a trigger depends on how you program the LIST STEP AUTO ONCE command The method you use will depend upon whether you want the list to be paced by dwell intervals or by triggers Dwell Paced Lists For a closely controlled sequence of output levels you can use a dwell paced list Each list output point remains in effect for the dwell time associated with that point When the dwell time expires the output immediately changes to the next point in the list For dwell pacing program LIST STEP to AUTO see Figure 5 3 A The dwell paced list requires only a single trigger to start the list The trigger subsystem remains in the dwelling state until the list is completed If LIST COUN is greater than 1 the entire lis
30. and 15 V See previous application for how to generate a power up sequence Once the power has been applied to the DUT the modules can be reprogrammed to perform the power down sequence The power down sequence is initiated when a fault in the DUT draws excessive current from the power module causing the module to change from CV to CC To prevent damage to the DUT it is necessary to remove the 5 V first then the 15 V modules 15 ms later Once again MPS triggering can solve the application In this scenario the CV to CC crossover event will be used as the trigger source The trigger will cause the modules in the correct order to change from their programmed voltages down to 0 V MPS Features Used Generate a trigger on a change in internal status Change the voltage on trigger Trigger in out from MPS mainframe backplane TTL Trigger o Trigger delay Active downprogramming Advantages Benefits Of The MPS Solution By using the modules change in status to automatically generate a trigger the computer is not devoted to polling the modules to detect a change in state By letting each module monitor its status the CC condition will generate a response faster than if the computer was polling the module to detect a change in state The sequence is simpler to program no timing loops By using trigger delay the timing is accurate and repeatable because the computer does not provide timing for the sequence The active downprogramm
31. can only be used in the calibration mode It allows you to change the calibration password Unless it is changed subsequently to shipment the password is the model number of the power module A new password is automatically stored in nonvolatile memory and does not have to be stored with the CAL SAVE command If the password is set to 0 password protection is removed and the ability to enter the calibration mode is unrestricted Command Syntax Parameters Examples Query Syntax Related Commands CALibrate PASScode lt NRf gt lt NRf gt CAL PASS 66102 CAL PASS 09 1991 None CAL STAT Language Dictionary 33 CAL SAVE This command can only be used in the calibration mode It saves any new calibration constants after a current or voltage calibration procedure has been completed in nonvolatile memory Command Syntax CALibrate SAVE Parameters None Examples CAL SAVE Query Syntax None Related Commands CAL STAT CAL CURR CAL VOLT CAL STAT This command enables and disables the calibration mode The calibration mode must be enabled before the power module will accept any other calibration commands except CAL AUTO The first parameter specifies the enabled or dis abled state The second parameter is the password It is required if the calibration mode is being enabled and the existing password is not 0 If the second parameter is not entered or is incorrect an error is generated and the calibration mode remains disabled
32. command then the query is listed separately The description for each common command or query specifies any status registers affected In order to make use of this information you must refer to Chapter 4 Status Reporting which explains how to read specific register bits and use the information that they return CLS ESE ESR xOPC xOPC xOPT xPSC xPSC RCL xRST xSAV 7 Y SRE STB TRG xTST Figure 3 1 Common Commands Syntax Diagram CLS Meaning and Type Clear Status Device Status Description This command causes the following actions see Chapter 4 Status Reporting for descriptions of all registers Clears the following registers Standard Event Status Operation Status Event Questionable Status Event Status Byte Clears the Error Queue 24 Language Dictionary If CLS immediately follows a program message terminator NL then the output queue and the bit are also cleared Command Syntax CLS Parameters None Query Syntax None ESE Meaning and Type Event Status Enable Device Status Description This command programs the Standard Event Status Enable register bits The programming determines which events of the Standard Event Status Event register see ESR are allowed to set the ESB Event Summary Bit of the Status Byte register A 1 in the bit position enables the corresponding event All of the enabled events of the Standard Event Status Event re
33. contains the initialization code for the interface Prior to running any applications programs you must set up the interface with the configuration program IBCONF EXE 16 Introduction To Programming Your application program will not include the power module symbolic name and GPIB address These must be specified during configuration when you run IBCONF EXE Note that the primary address range is from 0 to 30 but any secondary address must be specified in the address range of 96 to 126 The power supply expects a message termination on EOI or line feed so set EOI w last byte of Write It is also recommended that you set Disable Auto Serial Polling All function calls return the status word 5 which contains a bit ERR that is set if the call results in an error When ERR is set an appropriate code is placed in variable JBERR Be sure to check IBSTA after every function call If it is not equal to zero branch to an error handler that reads IBERR to extract the specific error Error Handling If there is no error handling code in your program undetected errors can cause unpredictable results This includes hanging up the controller and forcing you to reset the system Both of the above DOS drivers have routines for detecting program execution errors Important Use error detection after every call to a subroutine Agilent BASIC Controllers The Agilent BASIC Programming Language provides access to GPIB functions at the ope
34. for enabling specific bits from the Operation Event register to set the operation summary bit OPER of the Status Byte register This bit bit 7 is the logical OR of all the Operation Event register bits that are enabled by the Status Operation Enable register Command Syntax STATus OPERation ENABle lt NRf gt Parameters 01032727 Suffix None Default Value 0 Examples 5 1312 5 1 Query Syntax STATus OPERation ENABle Returned Parameters NRI Register value Related Commands STAT OPER EVEN Language Dictionary 43 STAT OPER NTR PTR Commands These commands set or read the value of the Operation NTR Negative Transition and PTR Positive Transition registers These registers serve as polarity filters between the Operation Enable and Operation Event registers to cause the following actions When a bit in the Operation NTR register is set to 1 then a 1 to 0 transition of the corresponding bit in the Operation Condition register causes that bit in the Operation Event register to be set When a bit of the Operation PTR register is set to 1 then a 0 to I transition of the corresponding bit in the Operation Condition register causes that bit in the Operation Event register to be set If the same bits in both NTR and PTR registers are set to 1 then any transition of that bit at the Operation Condition register sets the corresponding bit in the Operation Event register If the sam
35. gt CURR returns the present programmed current level CURR MAX and CURR MIN return the maximum and minimum programmable current levels Related Commands RST CURR MODE This command enables or disables list subsystem control over the power module output current When programmed with FIX this command prevents the output current from being controlled by the sequencing of points specified by LIST CURR If the LIST parameter is used then the output current may be changed by the subsequent execution of a list However the list mode does not prevent the output current from being set by CURR and RCL Note CURR MODE LIST is an implied ABORt command Command Syntax SSOURceJ CURRent MODE lt CRD gt Parameters FIXed LIST RST Value FIX Examples CURR MODE LIST CURR MODE FIX Query Syntax SOURce CURRent MODE Returned Parameters FIX LIST Related Commands CURR LIST RCL Language Dictionary 35 CURR PROT STAT This command enables or disables the power module overcurrent OC protection function If the overcurrent protection function is enabled and the power module goes into constant current CC mode then the output is disabled and the Questionable Condition status register OC bit is set see Chapter 4 Status Reporting An overcurrent condition can be cleared with the OUTP PROT CLE command after the cause of the condition is removed Command Syntax Parameters RST Value Examples Query Syntax Retu
36. measured_value atof measurement Converts measurement string to float Receiving Module Data with C Introduction To Programming 21 Language Dictionary Introduction This section gives the syntax and parameters for all the IEEE 488 2 SCPI commands and the Common commands used by the Agilent Series 6610xA power modules It is assumed that you are familiar with the material in Chapter 2 Introduction to Programming That chapter explains the terms symbols and syntactical structures used here and gives an introduction to programming The programming commands function the same way in all Agilent Series 6610xA power modules Since SCPI syntax remains the same for all programming languages the examples are generic Syntax definitions use the long form but only short form headers or keywords appear in the examples If you have any concern that the meaning of a header in your program listing will not be obvious at some later time then use the long form to help make your program self documenting Parameters Most commands require a parameter and all queries will return a parameter The range for a parameter may vary according to the model of power module Parameters for all current models are listed in Table 3 5 at the end of this chapter Related Commands Where appropriate related commands or queries are included These are listed either because they are directly related by function or because reading about them will
37. memory can eventually exceed the maximum number of write cycles and may cause the memory to fail Language Dictionary 27 RCL Meaning and Type Recall Device State Recalling a previously stored state may place hazardous voltage at the power module output Description This command restores the power module to a state that was previously stored in memory with a SAV command to the specified location The following states are recalled CAL AUTO LIST COUN OUTP REL STAT TRIG LINK CURR LEV IMM LIST STEP OUTP REL POL TRIG SOUR CURR MODE OUTP STAT OUTP TTLT STAT VOLT LEV IMM CURR PROT STAT OUTP DFI STAT OUTP TTLT LINK VOLT MODE DISP STAT OUTP DFI LINK OUTP TTLT SOUR VOLT PROT LEV INIT CONT OUTP PROT DEL TRIG DEL Sending RCL also does the following Forces an ABORt command before resetting any parameters this cancels any uncompleted trigger actions Disables the calibration function by setting CAL STATe to OFF The device state stored in location 0 is automatically recalled at power turn on when the power module configuration switch is set for this mode of operation see the power module User s Guide Note Whenever the power module is powered up the state stored in location 0 is written to the 5 volatile locations 5 through 9 Command Syntax RCL lt NRf gt Parameters 0 through 9 Example RCL 3 Query Syntax None Related Commands PSC RST SAV RST Meaning and Type Reset Device State Des
38. module Write real arrays to the power module Receive real numbers from the power module The six other application programs all use a subset of the above functions 1 1000 1010 1020 1030 1040 1050 1060 1070 1080 1090 1100 1110 1120 1130 1140 1150 1160 1170 1180 1190 1200 1210 1220 1230 1240 1250 1260 1270 1280 1290 1300 1310 1320 1330 MERGE SETUP BAS AS DESCRIBED IN YOUR GPIB COMMAND LIBRARY MANUAL APPLICATION 3 CONTROLLING VOLTAGE RAMP UP AT TURN ON FOR GWBASIC AND THE Agilent 61062 82990 82335A GPIB COMMAND LIBRARY PROGRAM Agilent 3 BAS OPTION BASE 1 INTERFACE 7 SELECT CODE OF THE GPIB CARD SLOTO 105001 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 00 CR LFS CHR 13 CHR 10 CARRIAGE RETURN LINE FEED END OF LINE TERMINATION DIM VSTEP 20 ARRAY TO HOLD THE VOLTAGE RAMP STEPS NUM POINTS 20 NUMBER OF POINTS IN THE VOLTAGE RAMP ARRAY VSTART 2 START VOLTAGE FOR RAMP VSTOP 10 STOP VOLTAGE FOR RAMP RAMPTIME 5 TIME IN SECONDS TO CHANGE FROM VSTART TO VSTOP DWELL RAMPTIME 19 DWELL TIME FOR EACH POINT SINCE THE OUTPUT STAYS AT THE LAST VOLTAGE POINT AFTER ITS DWELL TIME EXPIRES THE DWELL TIME OF THE LAST POINT IS NOT PART OF THE TRANSITION TIME THEREFORE DIVIDE THE TOTAL TIME BY 19 POINTS NOT 20 YOU WANT THE SAME DWELL TIME FOR EVERY POINT IN THE LIST SO YOU NEED TO DOWNLOAD ONLY 1 DWELL TIME 4 FOR l 1 TO 20 5
39. protection as the DUT current requirements drop off to their steady state value When the dwell time expires for the last current limit in the List the current limit stays at this value until reprogrammed Thus the actual value of the last dwell time is not important The last current List point would be the current limit for the steady state operation during the test of the DUT See Figure B5 2 for how the MPS implements this protection Throughout List execution overcurrent protection will be enabled If at any time the module goes into CC the output will be disabled the test stopped and the DUT protected MPS Features Used 20 point current List Dwell time Dwell paced Lists Disable the output on a change in internal status Stop the List on a change in internal status Change the voltage on trigger Trigger on a GPIB trigger command Overcurrent protection Active downprogramming Advantages Benefits Of The MPS Solution By using Lists the module changes its current limit automatically so that the computer is not devoted to reprogramming the current limit The output can change faster when dwell paced than when the computer must explicitly reprogram each change Overcurrent protection can disable the output before the DUT is damaged By letting the modules monitor status the CC condition will be responded to faster than if the computer was responsible for stopping the test The sequence is simpler to program no timing
40. the desired output levels or points The order of the points determines the order in which the output levels will occur To sequence the voltage through values of 1 1 5 3 1 5 and 1 volts program LIST VOLT 1 1 5 3 0 1 5 1 You can specify lists for both voltage and current For example LIST VOLT 1 2 5 6 8 LIST CURR 10 5 2 1 67 1 25 Both lists must have the same number of points The exception is if a list has only a single point In this case the single point list is treated as if it has the same number of points as the other list with each point equal to the programmed value For example if you send LIST VOLT 1 2 5 6 8 CURR 1 then the power module will respond as if the two lists were LIST VOLT 1 2 5 6 8 LIST CURR 1 1 1 1 1 Note Execution of a list will be aborted if an ABORt command or an implied ABORt command another list command the RST command or the command is sent Programming List Intervals The dwell time is the interval that the output remains at the programmed value The time unit is seconds The following command specifies five dwell intervals LIST DWEL 1 1 5 3 1 5 5 Synchronizing Power Module Output Changes 61 The number of dwell points must equal the number of output points LIST VOLT 3 0 3 25 3 5 3 75 LIST DWEL 10 10 25 40 The only exception is for a dwell list with one value which gives the same interval to all the points in the corresponding voltage or current list Note Sending
41. this by bypassing the Idle state If the ABORt command is given while INIT CONT is ON the trigger subsystem transfers to the Idle state but immediately exits to the Initiated state Trigger Status and Event Signals Some transitions of the trigger subsystem provide inputs to the status subsystem Others are defined as event handles which are selectable trigger sources by way of parameters in link commands TRIGger LINK OUTPut DFI LINK and OUTPut TTLT LINK see Table 3 1 Table 5 1 summarizes these signals Synchronizing Power Module Output Changes 59 Table 5 1 Trigger Subsystem Status and Event Signals Signal Type Description DWE Status Bit Dwelling True only during the dwelling state DWE can be monitored at the Operation Status register see Chapter 4 Status Reporting LSC Event Handle List Sequence Complete Occurs upon exit from the Dwelling state after the last programmed list point has been executed If LIST COUNt is greater than 1 LSC occurs once for each count until the list is done Event Handle TDC Event Handle STC Event Handle STS Event Handle WTG Status Bit Waiting for trigger True only when the trigger subsystem is in either the Initiated or the Delaying state WTG can be monitored at the Operation Status register see Chapter 4 Status Reporting Trigger In and Trigger Out The mainframe has two bnc connectors labeled Trigger In and Trigger Out Figure 5 2 shows the model for the
42. this state the trigger subsystem ignores all triggers When the trigger action has been completed the trigger subsystem returns to this state It also returns to the Idle state if the ABORt command or an implied ABORt command RST RCL or any LIST is sent Initiated State The INITiate command moves the trigger subsystem from the Idle state to the Initiated State This enables the power module to receive triggers The source of the trigger is selected with the TRIGger SOURce command see Chapter 3 Language Dictionary When in the Initiated state the power module responds to events on the selected trigger source by transferring to the Delaying state As shown in Figure 5 1A there is another trigger signal that is not subject to TRIG SOUR control This is the TRIGger IMMediate command 1f the trigger subsystem is in the Initiated state this command generates a trigger that transfers the trigger subsystem directly to the Output Change state bypassing the Delaying state Delaying State When a trigger event occurs on the selected trigger source the trigger subsystem transfers to the Delaying state In this state the subsystem waits for the interval specified by the TRIGger DELay command before moving to the next state As shown in Figure 5 1A a TRIGger IMMediate command will bypass any programmed delay and cause an immediate transition to the Output Change state IDLE STATE IDLE STATE INITCIM M INITIATED STATE INITIATED STATE TRI
43. to develop interrupt driven software that stops every 1 minute to take a reading By letting the module and the DMM run on their own code development is much simpler and computer resources are used more efficiently MPS Features Used 20 point voltage List Dwell time Trigger paced Lists Generate an SRQ on a change in internal status Generate a trigger on a change in internal status Trigger in out from MPS mainframe backplane TTL Trigger Trigger on a GPIB trigger command Application Programs 95 Advantages Benefits Of The MPS Solution The entire test executes without computer involvement the command processing time is eliminated from the test loop The entire test executes without computer involvement so the computer can perform other tasks while the test executes Software development is simplified you do not need to write a test loop because the module and the DMM are running on their own By using dwell times the trigger out signal can be sent at the correct time which permits the DUT to settle before a reading is taken Implementation Details How The MPS Implements The Sequence The module listens for the computer to send a trigger command Upon receipt of the trigger command the module outputs its first List point After the dwell time expires the STC is asserted and the module generates an external trigger The DMM receives the external trigger takes and stores a reading The DMM generates a Measurement Com
44. to open and read it 6 To use the VXIplug amp play instrument driver follow the directions in the VXIplug amp play online help for your specific driver under Introduction to Programming Accessing Online Help A comprehensive online programming reference is provided with the driver It describes how to get started using the instrument driver with Agilent VEE LabVIEW and LabWindows It includes complete descriptions of all function calls as well as example programs in and Visual BASIC e access the online help when you have chosen the default Vxipnp start folder click on the Start button and select Programs Vxipnp Agxxxx Help 32 bit where Agxxxx is the instrument driver 8 Introduction Introduction To Programming GPIB Capabilities Of The Power Module power module functions except for setting the GPIB address are programmable over the GPIB The IEEE 488 1 capabilities of the power module are listed in the User s Guide Module GPIB Address The power module operates from a primary GPIB address that is set by a switch on the mainframe The power module s secondary GPIB address is determined by its slot position within the mainframe See the mainframe Installation Guide for details Introduction To SCPI SCPI Standard Commands for Programmable Instruments is a programming language for controlling instrument functions over the GPIB IEEE 488 instrument bus SCPI is layered on top of the hardware p
45. use with the module The GPIB Command Library supports strings numeric and array data formats However multiple data types cannot be sent in a single command To send both string and numeric data in one command convert all numeric data to strings concatenate with the string data and send the combined string to the module To read multiple data types read the data into a string and then manipulate the string by converting each piece into the appropriate data format Error handling is accomplished by checking the variable PCIB ERR If it is nonzero an error has occurred See the command library documentation for trapping and interpreting this error variable Introduction To Programming 17 Using the National Instruments GPIB Interface When CALLs are made to the GPIB driver all parameters are passed as variables The module is identified as a device in two ways First the GPIB COM driver is modified to include the module Use the mainframe address as the primary bus address and the slot address as the secondary address The driver requires secondary address which is for slot 0 to be entered as 96 secondary address 1 to be entered as 97 etc It is recommended that you disable auto serial poll in the GPIB COM driver The module expects each command to be terminated by a line feed character 10 and or EOI Configure the GPIB COM driver to terminate all reads and writes with EOI The GPIB driver does all communication via strings
46. 0 150 160 170 180 190 200 210 220 230 240 250 260 210 280 290 300 310 320 330 340 350 360 370 380 390 APPLICATION 5 PROVIDING TIME VARYING CURRENT LIMITING PROGRAM APP_5 DIM C limits 50 Dwell 50 C_limit 4 1 3 0 2 0 1 0 0 7 CURRENT LIMIT DATA Dwell 0 2 0 05 0 1 0 15 0 1 DWELL TIME DATA ASSIGN Slot0 To 70500 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 00 OUTPUT Slot0 RST CLS STATUS PRESET 1 RESET AND CLEAR MODULE OUTPUT Slot0 VOLT 0 START TEST ATOV OUTPUT Slot0 OUTPUT ON ENABLE OUTPUT OUTPUT Slot0 CURRENT PROTECTION STATE ON ENABLE OCP OUTPUT Slot0 OUTPUT PROTECTION DELAY 0 DELAY BEFORE PROTECTION OCCURS OUTPUT Slot0 CURRENT MODE LIST SET TO GET CURRENT FROM LIST OUTPUT Slot0 LIST CURRENT C limit DOWNLOAD CURRENT POINTS OUTPUT Slot0 LIST DWELL Dwell DOWNLOAD DWELL TIMES OUTPUT QSlotO LIST STEP AUTO DWELL PACED LIST OUTPUT Slot0 VOLT TRIGGERED 12 GO TO 12 V WHEN TRIGGERED OUTPUT QSlotO INITIATE ENABLE TRIGGER TO START LIST AND APPLY 12V BEFORE TRIGGERING THE MODULE DETERMINE IF IT IS READY BY CHECKING FOR WAITING FOR TRIGGER BIT 5 OF THE OPERATION STATUS REGISTER YOU COULD ELIMINATE THIS STEP BY SIMPLY INSERTING A PAUSE IN THE PROGRAM HOWEVER BY CHECKING THE INSTRUMENT STATUS YOU CAN AVOID TIMING PROBLEMS ALSO ANY OTHER OPERATIONS THAT TAKE TIME WILL GIVE THE MO
47. 0 Application Programs L IOOUTPUTA SLOTO VSTEP 1 NUM POINTS TURN OFF EOI TURN OFF END OF LINE TERMINATION SEND THE VOLTAGE HEADER STRING TURN ON EOI TURN ON END OF LINE TERMINATION DOWNLOAD THE VOLTAGE POINTS ARRAY DOWNLOAD 1 DWELL TIME USE NUMBER TO STRING CONVERSION TO SEND REAL NUMBERS OVER THE BUS 5 PART OF THE COMMAND STRING DWELL PACED LIST ENABLE TRIGGER TO START LIST 1940 L LEN CMD 1950 CALL IOOUTPUTS SLOTO CMDS L 1960 IF PCIB ERR lt gt 0 THEN ERROR PCIB BASERR 1970 1980 BEFORE TRIGGERING THE MODULE DETERMINE IF IT IS READY BY CHECKING FOR 1990 WAITING FOR TRIGGER BIT 5 OF THE OPERATION STATUS REGISTER 2000 2010 YOU COULD ELIMINATE THIS STEP BY SIMPLY INSERTING A PAUSE IN THE PROGRAM HOWEVER BY 2020 CHECKING THE INSTRUMENT STATUS YOU CAN AVOID TIMING PROBLEMS ALSO ANY OTHER OPERATIONS 2030 THAT TAKE TIME WILL GIVE THE MODULE A CHANCE TO COMPLETE PROCESSING 2040 j 2050 CONDITION DATA 0 2060 2070 WHILE CONDITION DATA AND 32 lt gt 32 CONTINUE TO LOOP UNTIL BIT 5 VALUE 32 TRUE 2080 CMD STATUS OPERATION CONDITION 2090 L LEN CMD 2100 CALL IOOUTPUTS SLOTO CMD L 2110 PCIB ERR lt gt 0 THEN ERROR PCIB BASERR 2120 CALL IOENTER SLOTO CONDITION DATA 2130 PCIB ERR lt gt 0 THEN ERROR PCIB BASERR 2140 WEND 2150 2160 SEND TRIGGER COMMAND TO START LIST AND GENERATE
48. 000 2140 MEASURED VALUE VAL MEASUREMENTS THE STRING TO A NUMBER Receiving Module Data with BASIC 20 Introduction To Programming dottore Microsoft C Agilent 82335A 829904 61062B GPIB Command Library 3 Assumes that you have an error handler routine called error that accepts a float The error handler is then passed the float that is returned from each call to the library include amp lt stdio h gt include k lt chpib h gt include amp lt cfunc h gt define MODULE_ADDRESS 70501L char cmd float measurement error ioenterr MODULE ADDRESS amp amp measurement error handler error Microsoft C National Instruments GPIB Interface Assumes that you have an error handler routine called error_handler The error handler is then passed the float that is returned from each call to the library include amp lt stdio h gt include amp lt stdlib h gt include amp lt decl h gt define ERR 1 amp amp 15 Error is detected as bit 15 of ibsta define STRING LENGTH 20 Length of string to hold measurement int module address Device is configured in the GPIB COM handler Use ibfind to assign a value to module address char measurement STRING LENGTH float measured value Holds float conversion of measurement ibwrt module address measurement STRING LENGTH if ibsta amp ERR error_handler
49. 0602 Agilent 82335A Interface 1070 ASSIGN PM3TO 70602 Agilent BASIC Interface 1080 1080 Power Module installed in Auxiliary Mainframe 1090 PM 70610 Agilent 82335A Interface 1090 ASSIGN PM3 TO 70610 Agilent BASIC Interface For systems using the National Instruments DOS driver the address is specified in the software configuration program IBCONFIG EXE and assigned a symbolic name The address then is referenced only by this name within the application program see the National Instruments GPIB documentation DOS Drivers Types of Drivers The Agilent 82335A and National Instruments GPIB are two popular DOS drivers Each is briefly described here See the software documentation supplied with the driver for more details Agilent 82335A Driver For GW BASIC programming the GPIB library is implemented as a series of subroutine calls To access these subroutines your application program must include the header file SETUP BAS which is part of the DOS driver software SETUP BAS starts at program line 5 and can run up to line 999 Your application programs must begin at line 1000 SETUP BAS has built in error checking routines that provide a method to check for GPIB errors during program execution You can use the error trapping code in these routines or write your own code using the same variables as used by SETUP BAS National Instruments GPIB Driver Your program must include the National Instruments header file DECL BAS This
50. 2 Message Terminator nee tete ee bee e eerte eerte tee b iesus exce e ene gern eei io ung eee 12 Traversing the Command Tree enne nennen trennen trennen ersten nen trennen trennen 13 Active Header Path i tide oum p ROT o pP ERE 13 The Effect of Optional e ennt e he t t ee bet 13 Moving Among 50 nennen 14 Including Common Commands esses eene rennen 14 SCPI Data Formats no oce alit Gee erp to e e DoD a ege E e Erbe Eben 14 Numerical Data zit xb unite RU nich A es eects tee 14 Boolean Data eno se oe temere Mee eue te RE c eke 15 stung ee debi ee Bet ees eee 15 Character Dat epe gre tette tet e ri dire p RED DE terre o i rne D De ERG Mere 15 System Considerations uen et ee inet ei eld de ep tete ep etr tee re tr er 16 Assigning the Address in Programs sessssesssseeseeeeeeneee rennen nennen nennen trennen mese trente 16 DOS D Vets EEEE EES N E E Pa OD S gen eU UI UE a E 16 Types of DUVETS PE 16 Agilent 82333A DIVET prn a E En ERU ER EUIS EE ben E E N S 16 National Instruments GPIB Driver ener enne entren nennen nen 16 Error Handling ne RE Reeve AE eee eet pier bee eee eee T 17 Agilent BASIC for Series 300 meet phe DOR Ees Rue EROR en 17 Translation Among
51. 4 4 shows the register states and corresponding power on commands for the factory default RST power on state If the module power on function switch is set to 0 then the power on state is determined by the parameters stored in location 0 see Chapter 4 of the User s Guide Table 4 4 Default Power On Register States Register Condition Caused By Operation PTR Questionable PTR All bits 1 STAT PRE Operation NTR Questionable NTR All bits 0 STAT PRE Operation Event Questionable Event All bits 0 CLS Operation Enable Questionable Enable All bits 0 STAT PRE Standard Event Status Enable All bits 0 ESE 0 Status Byte All bits 0 CLS Status Request Enable All bits 0 SRE 0 Output Queue Cleared CLS If PSC 1 If PSC 0 then the last previous state before turn on is recalled The value of PSC is stored in nonvolatile memory The PON Power On Bit The PON bit in the Standard Event register is set whenever the power module is turned on The most common use for PON is to generate an SRQ at power on following an unexpected loss of power To do this bit 7 of the Standard Event Enable register must be set so that a power on event registers in the ESB Standard Event Summary Bit Also bit 5 of the Service Request Enable register must be set to permit an SRQ to be generated The commands to accomplish these two conditions are ESE 128 SRE 32 If PSC is programmed to 0 the contents of the Standard Eve
52. 5 114 12V 5 12 6 V 12V 5 12V 11 4 V 5V 12V 12 6 V When conducting this test the modules will need to be reprogrammed 21 times and seven measurements made The command processing time could slow down this test The MPS can be used to increase throughput By downloading all of the combinations into the three modules each setting can be quickly stepped through by triggering all modules to change to their next voltage setting and then taking a measurement from the DUT This permits testing without command processing overhead MPS Features Used 20 point voltage List Trigger paced Lists Trigger in out from MPS mainframe backplane TTL Trigger Trigger on a GPIB trigger command Advantages Benefits Of The MPS Solution By using Lists the module changes its voltage without delays due to processing the command to change the output voltage By using triggers all three outputs can be changed with one command The computer loop to change the settings and take a measurement is simplified because you do not have to explicitly reprogram each module output Instead the loop becomes Trigger and Measure Implementation Details How The MPS Implements The Sequence The following steps are performed for each point in the List The computer sends a trigger command to the first module The first module simultaneously sends a backplane TTL Trigger to the other two modules and goes to its next List point The second module receives
53. 77 Application 3 Controlling Output Voltage Ramp Up at Turn On Overview Of Application When control over the rate of voltage ramp up at turn on of the power module output is required the desired shape can be approximated by downloading and executing a series of voltage and dwell time points For this example you need to program the power module to change its output from 2 volts to 10 volts slewing through the 8 volt transition in 0 5 seconds This results in a turn on ramp up of 16 V per second The MPS can create this voltage versus time characteristic using Lists The desired characteristic in this case linear is simulated using the 20 available voltage points To determine the value of each point in the transition simply divide the change in voltage by 20 To determine the dwell time of each voltage point divide the total transition time by 19 After the List has been executed the module will continue to output the final value in this case 10 volts until the output has been reprogrammed to another value Note that the dwell time of the last point is not part of the transition time To determine the slowest ramp up longest transition time that can be generated you must consider how smooth you need the voltage versus time characteristic to be As the dwell time associated with each point gets longer the output voltage will become more like a stair step and less like a linear transition see Figure B3 1 To determine the fastes
54. 960 CALL IBRD SLOTO CONDITION DATA F IBSTA 0 THEN 1960 WEND SEND TRIGGER COMMAND TO START LIST AND GENERATE THE VOLTAGE RAMP 4 CMD TRIGGER IMMEDIATE THIS IS AN IMMEDIATE TRIGGER WHICH IS ALWAYS CALL IBWRT SLOTO CMDS ACTIVE THEREFORE IT DOES NOT NEED TO BE IF IBSTA 0 THEN GOTO 1960 SELECTED AS A TRIGGER SOURCE STOP GENERAL ERROR HANDLER 4 PRINT GPIB function call error PRINT IBSTA IBSTA IBERR IBERR IBCNT96 IBCNT END Application Programs 103 f APPLICATION 3 CONTROLLING VOLTAGE RAMP UP AT TURN ON FOR MICROSOFT C AND THE Agilent 61062 82990 82335A GPIB COMMAND LIBRARY FOR MS DOS PROGRAM Agilent3 C include lt stdio h gt include lt stdlib h gt include lt string h gt include chpib h include cfunc h define INTERFACE 7L Ff Select code 7 for the Agilent 1B interface card 5 define SLOTO 70500L Ff Select code 7 mainframe address 05 slot 00 define WTG 32 Waiting for Trigger WTG bit5 value 32 define NUM PTS 20 f 20 points in the voltage List int error main char cmd FK Used to hold command strings sent to the module char cmd buff 255 fF Used to hold command strings during string manipulations static char If 3 13 10 0 Carriage return line feed end of line int i fF Loop counter float condition data fF Used to hold data from read back of status conditio
55. A 15 nt OG RERO OH ERE I TERRI era 27 31 IDDE bt hen E me ei eei ipM 25 52 default state see RST state Getestet edP PA eter ue ek ce Ee ore XP tube 49 62 ite ce RR n EATER NIEVE 52 56 59 R 16 zur EP 24 46 error messages r ntrme ohne ecuaciones 65 Selttest sumet Eus LU bos br c Ms 31 65 icum 65 IJ R A M 25 30 50 52 55 EUREN TEE 49 54 iEn ditte idees obe UA 25 52 factory default state see RST state FLT output see DFT Index 111 Gp 31 47 GW BASIO Cte uet Me 17 20 H headers uto e mn tpe more pet in pee ie Seo tt cte eem opes Dv 11 CONVENTIONS coerente EE EE e Det
56. AT 45 apto HR rn DARE DA rA tr E eire te EH ees 36 juae 36 itt ete E ERAI E Ee i EE 36 List Subsystems iip REPRE Sonia eel ni eve Ce aes 37 LIST CQUN 2 oh PR Reb DRIED eee 37 LIST GURR isle perte eet feierte eie cte i e etes e bte ple ig dd 37 LIST CURR POIN i eite ote irm EE cubes ee abe 38 eri 38 LIST DWEL POIN uit eerie tette tt ep RE Tea reete Hehe 38 LISTS DER reU Ie ram nU te URS RU 38 LIST VOLETE oe peret eec Eee eee aie ieee 39 LISIEVOLTPOUN We hee RL A UD ee ties benedi 39 5 cn hene ene p bpm pere 39 MEAS tie pri e ie or eb put ei i He E e rh 39 Output Subsystem ete tee o e ere ie e itt tiers 39 OUT Paes re oh Sie EDS utentes ine ied 39 eR Dr DAP ERE DRM ERE FEEDER Dr Eb EHE tees 40 OUTPE DEESOUR z thu me Rhet 40 OUTE PROT CLE e costes ec oni UO DERE 40 nente et p et itte po meri 41 EEUU ee e Peiper e pe 41 eee HRS Rep e tpe ter ae 41 nci pe Pe e te e veniet bts 42 OUTP TTET EINK rem tie ree e tere nu reete e adest 42 OUTP LILET SOUR 3 Renee eet eei e eb Sh alee iro eee Er Peres 42 Status SubSystem ego ie ettet eae e d
57. ATe lt bool gt 0111 OFF ON OFF OUTP DFI 1 OUTP DFI OFF OUTPut DFI STATe 011 OUTP DFI LINK OUTP DFI SOUR This command specifies which events within the power module are linked to DFI source events Command Syntax OUTPut DFI LINK lt CRD gt Parameters See Table 3 2 RST Value SUM3 Examples OUTP DFI LINK CC OUTP DFI LINK OFF Query Syntax OUTPut DFI LINK Returned Parameters See Table 3 2 Related Commands OUTP DFI SOUR OUTP DFI SOUR OUTP DFI STAT This command selects the source for DFI events The only available source is LINK Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands OUTP PROT OUTP DFI SOUR lt CRD gt LINK LINK OUTP DFI SOUR LINK OUTPut DFI SOUR LINK OUTP DFI LINK OUTP DFI STAT There are two output protection commands that do the following OUTP PROT CLE Clears any overvoltage OV overcurrent OC overtemperature OT or remote inhibit RI protection features After this command the output is restored to the state it was in before the protection feature occurred 40 Language Dictionary OUTP PROT DEL Sets the delay time between the programming of an output change that produces a CV CC or UNREG condition and the recording of that condition by the Status Operation Condition register The delay prevents momentary changes in power module status that can occur during reprogramming from being registered as events
58. Complete Figure B7 1 Block Diagram of Application 7 Signals computer List to take Points data from Computer Trigger MM Command to Module 4 to R Operation Complete List Point 1 2 3 12 13 Module Output Q Dwell Time Step Completed STC ES ENTM 2s uus in MPS Ext Trigger Out EE y P uH DMM Trigger In i DMM Measurement F 1 i DMM Measurement Complete MPS Ext Trigger In L Figure B7 2 Timing Diagram of Application 7 Application Programs 97 10 20 30 40 50 60 10 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 210 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 APPLICATION 7 TPUT SEQUENCING WITHOUT COMPUTER INTERVENTION IPROGRAM APP 7 ASSIGN 51010 TO 70500 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 00 DIM Viist 80 Vlist 8 8 5 9 9 5 10 10 5 11 11 5 12 12 5 13 13 5 14 VOLTAGE LIST POINTS OUTPUT Slot0 RST CLS STATUS PRESET OUTPUT Slot0 VOLT 0 OUTPUT Slot0 CURR 1 SET CURRENT LI OUTPUT Slot0 OUTPUT ON ENABLE OUTPUT RESET AND CLEAR MODULE OUTPUT Slot0 VOLT MODE LIST SET TO GET VOLTAGE FROM LIST STARTATOV T OUTPUT
59. DULE A CHANCE TO COMPLETE PROCESSING REPEAT OUTPUT Slot0 STATUS OPERATION CONDITION ENTER 9 Slot Condition data UNTIL BIT Condition_data 5 TEST FOR 5 TRUE SEND Agilent 1 COMMAND TO START LIST AND APPLY 12V OUTPUT 95100 TRIGGER IMMEDIATE THIS IS AN IMMEDIATE TRIGGER WHICH IS ALWAYS ACTIVE THEREFORE IT DOES NOT NEED END TOBE SELECTED AS A TRIGGER SOURCE Figure B5 3 Agilent BASIC Program Listing for Application 5 Application Programs 89 Application 6 Output Sequencing Paced by the Computer Overview Of Application When performing bias supply margin testing throughput can be maximized by eliminating the command processing time associated with reprogramming all outputs for each set of limit conditions Instead multiple sets of bias limit conditions can be downloaded to the power modules during test system initialization During the testing the computer can use a single command to simultaneously signal all power modules to step through each test condition In this example the DUT requires 5 V and 12 V The DUT is tested to ensure proper operation at marginal supply voltages The margin specified is 5 of nominal voltage At each of the combinations given below the computer first sets up the three modules and makes a measurement on the DUT The combinations to be tested are Nominal 5 V Nominal 12 V Nominal 12 V 4 75 V 12V 12V 5 12V 12V 5 25 V 12V 12V
60. GCIMM TRIGGERED EVENT DELAYING STATE DELAYING STATE DELAY COMPLETED DELAY COMPLETED OR TRIGEIMM OR TRIGI IMM OUTPUT CHANGE STATE DWELLING STATE DWELL COMPLETED A FIXED MODE B LIST MODE Figure 5 1 Simplified Models of Trigger Modes 58 Synchronizing Power Module Output Changes Output Change State When the trigger subsystem enters the Output Change state the output voltage and current are set to the pending levels programmed by the VOLTage TRIGgered and CURRent TRIGgered commands Once this occurs the existing triggered levels are cleared and must be reprogrammed If no triggered levels are programmed then the trigger has no effect on the output levels When the triggered actions are completed the trigger subsystem returns to the Idle state Model of List Mode Trigger Operation Figure 5 1B is a simplified model of trigger subsystem operation when power module is programmed for list mode output Operation in the Idle Initiated and Delaying states are identical to that described under fixed mode operation Output Change State When the trigger subsystem enters the Output Change state in List mode the output voltage and or current is set to the next value point in the programmed list The trigger subsystem then transfers to the next Dwelling state and increments the list to the next point If there are no more points in the list the subsystem resets the list to the first point This completes the list unless LIST COU
61. HE INSTRUMENT STATUS YOU CAN AVOID TIMING PROBLEMS ALSO ANY OTHER OPERATIONS THAT TAKE TIME WILL GIVE THE MODULE A CHANCE TO COMPLETE PROCESSING REPEAT OUTPUT Slot0 STATUS OPERATION CONDITION ENTER 9 5100 data UNTIL BIT Condition_data 5 TEST FOR 5 TRUE BEGIN THE SELF PACED TEST LOOP BY TRIGGERING THE MODULE TO START THE LIST OUTPUT Slot0 TRIGGER IMME DIATE THIS IS AN IMMEDIATE TRIGGER WHICH IS ALWAYS ACTIVE DOES NOT NEED TO BE SELECTED AS TRIGGER SOURCE GOTO 530 IDLE IN LOOP WAITING FOR SRQ OR GO DO OTHER TASKS Srq handler l ADD LINES HERE TO READ THE DATA BUFFER FROM THE DMM l END Figure B7 3 Agilent BASIC Program Listing of Application 7 98 Application Programs Supplemental Information This appendix contains program listings translated into the following DOS compatible languages and GPIB interfaces GWBASIC and the Agilent 61062 82990 82335A GPIB Command Library for MS DOS GWBASIC and the National Instruments GPIB PC Interface Card Microsoft C and the Agilent 61062 82990 82335A GPIB Command Library for MS DOS Microsoft C and the National Instruments GPIB PC Interface Card Each program is translated from the Agilent BASIC listing found in application 3 This example program was chosen as representative of all application programs because it shows how to Configure the interface card Address the power module Write strings to the power
62. LAY Short Form The header has only the first three or four letters such as VOLT STAT and DEL Short form headers are constructed according to the following rules If the header consists of four or fewer letters use all the letters DFI LIST If the header consists of five or more letters and the fourth letter is not a vowel 1 0 use the first four letters CURRent STATus If the header consists of five or more letters and the fourth letter is a vowel a e i 0 u use the first three letters DELay RELay You must follow the above rules when entering headers Creating an arbitrary form such as POLAR for POLarity will result in an error Introduction To Programming 11 The SCPI interface is not sensitive to case It will recognize any case mixture such as TRIGGER Trigger TRIGger triGgeR Note Shortform headers result in faster program execution Header Convention In this manual headers are emphasized with boldface type The proper short form is shown in upper case letters such as DELay Header Separator If a command has more than one header you must separate them with a colon VOLT PROT OUTPut RELay POLarity Optional Headers The use of some headers is optional Optional headers are shown in brackets such as OUTPut STATe ON However if you combine two or more message units into a compound message you may need to enter the optional header This is explained under Traversing the Command Tre
63. LICATION 6 OUTPUT SEQUENCING PACED BY THE COMPUTER PROGRAM APP 6 DIM Plus 5 8 50 1 12v 50 Minus 1218 50 Plus 5 4 75 5 5 25 5 5 5 5 Ptus_12v 12 12 12 114 12 6 12 12 Minus 12v 2 12 12 12 12 12 11 4 12 6 Num test steps 7 Dwell 010 ASSIGN 8510070 70500 ASSIGN Slotl TO 70501 ASSIGN 8510270 70502 SETUP MODULE IN SLOT 0 AS 45 V BIAS SUPPLY OUTPUT OUTPUT OUTPUT OUTPUT OUT OUT OUTPUT Ol TPUT OUTPUT OUTPUT OUTPUT PUT PUT Slot0 RST CLS STATUS PRESET Slot0 VOLT 0 Slot0 OUTPUT ON Slot0 VOLTAGE MODE LIST Slot0 LISTVOLTAGE Plus 5v Slot LIST DWELL Dwell Slot0 LIST STEP ONCE Q Slot TRIGGER SOURCE BUS Slot0 OUTPUT TTLTRG SOURCE BUS Slot0 OUTPUT TTLTRG STATE ON Slot0 INITIATE ISET UP MODULE IN SLOT 1 AS 12 V BIAS SUPPLY OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT OUT OUT OUTPUT PUT PUT Slotl RST ACLS STATUS PRESET Slotl VOLT 0 Slotl OUTPUT ON Slotl VOLT MODE LIST Slotl LIST VOLTAGE Plus 12v SlotL LIST DWELL Dwell Slotl LIST STEP ONCE Slotl TRIGGER SOURCE TTLTRG SlotL INITIATE SET UP MODULE IN SLOT 2 AS 12 V BIAS SUPPLY OUTPUT OUTPUT OUT OUT OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT PUT PUT Slot2 RST ACLS STATUS PRESET Slot2 VOLT 0 Slot2 OUTPUT ON Q Slo VOLT MODE LIST Slot2
64. LOTO CMD L PCIB ERR lt gt 0 THEN ERROR PCIB BASERR SET TO GET VOLTAGE FROM LIST 4 SENDING THE VOLTAGE DATA POINTS REQUIRES TWO STEPS USING THE GPIB COMMAND LIBRARY THE INSTRUCTION CONTAINS BOTH STRING DATA AND A REAL ARRAY FIRST SEND THE STRING DATA COMMAND HEADER LIST VOLT TO THE MODULE USING IOOUTPUTS THEN SEND THE REAL ARRAY USING IOOUTPUTA HOWEVER YOU MUST INHIBIT THE EOI AND END OF LINE TERMINATOR AFTER THE IOOUTPUTS COMMAND OR THE MODULE WILL STOP TAKING DATA THEN RE ENABLE THEM TO TERMINATE THE IOOUTPUTA 5 0 CALL IOEOI INTERFACE IF PCIB ERR lt gt 0 THEN ERROR PCIB BASERR END OF LINE 0 CALL IOEOL INTERFACE CR LF END OF LINE IF PCIB ERR lt gt 0 THEN ERROR PCIB BASERR 4 CMD LIST VOLT L LEN CMD CALL IOOUTPUTS SLOTO CMD L IF PCIB ERR lt gt 0 THEN ERROR PCIB BASERR 01 5 1 CALL IOEOI INTERFACE EOISTATE IF PCIB ERR 20 THEN ERROR PCIB BASERR END OF LINE LEN CR LF CALL IOEOL INTERFACE CR LF END OF LINE PCIB ERR lt gt 0 THEN ERROR PCIB BASERR 4 CAL PCIB ERR lt gt 0 THEN ERROR PCIS BASERR CMD LIST DWELL STR DWELL L ZLEN CMD CALL IOOUTPUTS F PCIB ERR 20 SLOTO CMD L THEN ERROR PCIB BASERR 4 CMD LIST STEP AUTO L LEN CMD CALL IOOUTPUTS SLOTO CMD L PCIB ERR lt gt 0 THEN ERROR PCIB BASERR 4 CMD INITIATE 10
65. LTage POINts LINK SOURce VOLTage LEVel I 1MMediate AMPLitude PROTectlon Pan MODE TRIGgered AmPLitude PROTection LEVel STATe POLarity SENSe ALC SOURce TTLTrg Eim iuc SOURce STATus OPERatlon EVENt CONDItlon ENABie NTRansitlon PTRansitlon PRESet QUEStionable EVEN d CONDiItlon 104 2 1 NTRansition PTRansition Figure 3 2 Subsystem Tree Diagram Calibration Subsystem The commands in this subsystem allow you to do the following Control automatic calibration of the measurement subsystem Enable and disable the calibration mode Change the calibration password Calibrate the overvoltage protection OVP circuit Calibrate the current and voltage output levels and store new calibration constants in nonvolatile memory CAL AUTO This command controls the autocalibration function and is used to substantially improve the accuracy of the MEAS CURR and MEAS VOLT data readback queries It does this by compensating for temperature drift in the readback circuitry 32 Language Dictionary Whenever CAL AUTO ONCE is sent the power module performs an immediate readback temperature compensation CAL AUTO ONCE is a sequential command that takes several seconds to complete When CAL AUTO ON is sent the power module automatically performs a readback temperature compensation before executing every MEAS command Use of this command extends the e
66. Memory Locations 5 0 through 4 5 5 through 9 Volatile Memory Locations 50 Language Dictionary Status Reporting Power Module Status Structure Figure 4 1 shows the status register structure of the power module The Standard Event Status Byte and Service Request Enable registers and the Output Queue perform standard GPIB functions as defined in the JEEE 488 2 Standard Digital Interface for Programmable Instrumentation The Operation Status and Questionable Status registers implement status functions specific to the power module Status Register Bit Configuration Table 4 2 and Figure 4 1 show the bit configuration of each status register Operation Status Group Register Functions The Operation Status registers record signals that occur during normal operation The group consists of the following registers A Condition register that holds real time status of the circuits being monitored It is a read only register A PTR NTR positive transition negative transition Filter that functions as described under STAT OPER NTRIPTR COMMANDS in Chapter 3 Language Dictionary This is a read write register An Event register that latches any condition that is passed through the PTR or NTR filters Reading the Event register clears it An Enable register that functions as described under STAT OPER ENAB in Chapter 3 Language Dictionary This is a read write register The outputs of the Operation Status g
67. Multiple Modules During Power Up Overview of Application When testing mixed signal devices bias supply voltages are typically applied before logic bias supply voltages Fora device that is sensitive to when bias voltages are applied the order of power up of multiple power modules can be controlled For this example the device requires three bias supplies 5 V for the logic circuits and 15 V for amplifier circuits To properly power up the device the supplies must be sequenced so that the 15 V are applied first and the 5 V is applied 50 ms later The MPS can easily address this application through the use of triggers The trigger will cause the modules to change from 0 V where they are not powering the DUT to their final voltage By delaying the response to the trigger you can control when the module s output voltage changes This means you can control the sequence of the modules during power up MPS Features Used Change the voltage on trigger Trigger in out from MPS mainframe backplane TTL Trigger Trigger on a GPIB trigger command Trigger delay Trigger delay Advantages Benefits Of The MPS Solution By using trigger delay the timing is accurate and repeatable The sequence is simpler to program no timing loops The computer is not devoted to sequencing power modules The computer does not provide timing for the sequence One command initiates the sequence Implementation Details How the MPS Implements The Sequenc
68. Nt is programmed to greater than one In that case the list is not completed until it has repeated the list sequence the number of times specified by the count Dwelling State Each voltage and current list point has an associated dwell interval specified by the LIST DWELL command After the new output value is established the trigger system pauses for the programmed dwell interval During this dwell interval trigger events are ignored and only an ABORt or implied abort command can transfer the subsystem out of the Dwelling state At the end of the dwell interval the transition to the next state depends on whether or not the list has completed its sequencing and on how the LIST STEP command has been programmed If the list is completed the trigger subsystem returns to the Idle state If the list is not completed then the subsystem reacts as follows If LIST STEP ONCE has been programmed the trigger subsystem returns to the Idle state If LIST STEP AUTO has been programmed the trigger subsystem returns to the Output Change state and immediately executes the next list point The INITiate CONTinuous Command In the above descriptions of the trigger subsystem models the INITiate IMMediate command was used to move from the Idle to the Initiated state In some applications it may be desirable to have the subsystem return directly to the Initiated state after a trigger action has completed Programming INITiate CONTinuous ON does
69. OLT MODE LIST SET TO GET VOLTAGE FROM LIST OUTPUT Slot0 LIST VOLT V step DOWNLOAD VOLTAGE POINTS ENABLE OUTPUT OUTPUT Slot0 LIST DWELL Dwell DOWNLOAD 1 DWELL TIME OUTPUT Slot0 LIST STEP AUTO DWELL PACED LIST OUTPUT Slot0 INITIATE ENABLE TRIGGER TO START LIST BEFORE TRIGGERING THE MODULE DETERMINE IF IT IS READY BY CHECKING FOR WAITING FOR TRIGGER BIT 5 OF THE OPERATION STATUS REGISTER YOU COULD ELIMINATE THIS STEP BY SIMPLY INSERTING A PAUSE IN THE PROGRAM HOWEVER BY CHECKING THE INSTRUMENT STATUS YOU CAN AVOID TIMING PROBLEMS ALSO ANY OTHER OPERATIONS THAT TAKE TIME WILL GIVE THE MODULE A CHANCE TO COMPLETE PROCESSING REPEAT OUTPUT Q Slot0 STATUS OPERATION CONDITION ENTER Slot0 Condition_data UNTIL BIT Condition data 5 TEST FOR 5 TRUE SEND TRIGGER COMMAND TO START LIST AND GENERATE THE VOLTAGE RAMP OUTPUT 95100 TRIGGER IMMEDIATE THIS IS AN IMMEDIATE TRIGGER WHICH IS ALWAYS ACTIVE THEREFORE IT DOES NOT NEED TO BE SELECTED AS A TRIGGER SOURCE END Figure B3 4 Agilent BASIC Program Listing for Application 3 Application Programs 81 Application 4 Providing Time Varying Voltages Overview of Application To burn in devices using thermal or mechanical cycling stress cyclical time varying voltage is provided by programming a set of voltage and dwell time points that repetitively sequence over time
70. QSloto LIST VOLT Vlists DOWNLOAD VOLTAGE LIST POINTS OUTPUT Slot0 LIST DWELL 050 DOWNLOAD 1 DWELL POINT ASSUMES SAME FOR ALL POINTS USE A 50 ms SETTLING TIME AS THE DWELL TIME OUTPUT QSlotO LIST STEP ONCE EXECUTE 1 POINT PER TRIGGER ENABLES DETECTION OF IN THE STANDARD EVENT REGISTER BIT 0 VALUE 10F THE STANDARD EVENT REGISTER ENABLES THE SERVICE REQUEST REGISTER TO GENERATE AN SRQ WHEN ANY EVENT IN THE STANDARD EVENT REGISTER IS ASSERTED THE STANDARD EVENT REGISTER 5 VALUE 32 OUTPUT Slot0 ESE 1 OUTPUT Slot0 SRE 32 OUTPUT Slot0 OUTPUT TTLTRG STATE ENABLE BACKPLANE TTL TRIGGER DRIVE OUTPUT Slot0 OUTPUT TTLTRG SOURCE LINK WHEN THE MODULE INDICATES SIC STEP COMPLETED OUTPUT Slot0 OUTPUT TTLTRG LINK STC 1 GENERATE A BACKPLANE TTL TRIGGER OUTPUT Slot0 TRIGGER SOURCE EXTERNAL USE EXTERNAL TRIGGER IN BNC AS TRIGGER SOURCE OUTPUT QSlotO INITIATE ENABLE RESPONSE TO TRIGGER OUTPUT Slot0 OPC TELLS MODULE TO ASSERT OPC OPERATION COMPLETE WHEN IT COMPLETES THE LIST OPC GENERATES SRO ON INTR 7 GOSUB Srq handler ENABLE SRQ INTERRUPT AND ENABLE INTR 7 2 DENTIFY HANDLER SUBROUTINE BEFORE TRIGGERING THE MODULE DETERMINE IF IT 15 READY BY CHECKING FOR WAITING FOR TRIGGER BIT 5 OF THE OPERATION STATUS REGISTER YOU COULD ELIMINATE THIS STEP BY SIMPLY INSERTING A PAUSE IN THE PROGRAM HOWEVER BY CHECKING T
71. R MODE LIST CURR LIST DWEL LIST STEP LIST VOLT VOLT MODE This command specifies the output current points in a list The current points are given in the command parameters which are separated by commas Up to 20 points may be entered and the output current values specified by the points will be generated in the same order as they were entered Command Syntax Parameters Default Suffix Examples Query Syntax Related Commands SOURce LIST CURRent lt NRf gt lt NRf gt See Table 3 2 A LIST CURR 2 5 3 0 3 5 LIST CURR MAX 2 5 MIN None CURR MODE LIST CURR POIN LIST DWEL Language Dictionary 37 LIST CURR POIN This query returns the number of points specified in LIST CURR Note that it returns only the total number of points not the point values Query Syntax SOURce LIST CURRent POINts Returned Parameters lt NRI gt Example LIST CURR POIN Related Commands CURR MODE LIST CURR LIST DWEL LIST DWEL This command sets the dwell points for the output current list and output voltage list Each dwell point specifies the time in seconds that the output of the power module is to remain at the level specified by the corresponding point in the current or voltage list At the end of the dwell time the output of the power module depends upon the following conditions If LIST STEP AUTO has been programmed the output automatically changes to the next point in the list If LIST STEP ONCE has been programmed the ou
72. RIGGER SOURCE Figure B4 2 Agilent BASIC Programming Listing for Application 4 Application Programs 85 Application 5 Providing Time Varying Current Limiting Overview Of Application To provide current limit protection which varies as a function of time multiple thresholds on current limit are required Having multiple thresholds can provide a high limit to protect the DUT during its power up in rush with automatic switchover to a lower limit to protect the DUT during its steady state operation For this example the DUT is a printed circuit assembly This assembly is being tested prior to installation in the end product The module provides power to the assembly which will undergo a functional test The assembly has capacitors on board and when power is applied the in rush current approaches 4 A After the capacitors charge which takes about 500 milliseconds the steady state current settles to 600 mA See Figure B5 1 The MPS can address this application using dwell paced Lists In this case the List will consist of a set of current limits and dwell times because the voltage will remain constant throughout the test Once power has been applied the first current limit which provides protection to a shorted DUT while still allowing high current in rush to occur will remain in effect for the dwell time Then the current limit will switch to its next setting in the List The result is a current limit which changes with time and provides
73. SEND REAL NUMBERS OVER THE BUS 5 PART OF THE COMMAND STRING 4 4 4 4 ENABLE OUTPUT SET TO GET VOLTAGE FROM LIST DOWNLOAD VOLTAGE LIST POINTS DOWNLOAD 1 DWELL TIME USE NUMBER TO STRING 1580 1590 1600 1610 1620 1630 1640 1650 1660 1670 1680 1690 1700 1710 1720 1730 1740 1750 1760 1770 1780 1790 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 CALL IBWRT SLOTO CMD CONVERSION TO SEND REAL NUMBERS OVER THE BUS F IBSTA 0 THEN GOTO 1960 5 PART OF THE COMMAND STRING D LIST STEP AUTO DWELL PACED LIST ALL IBWRT SLOTO CMD F IBSTA 0 THEN GOTO 1960 CMD INITIATE ENABLE TRIGGER TO START LIST CALL IBWRT SLOTO CMD F IBSTA 0 THEN GOTO 1960 BEFORE TRIGGERING THE MODULE DETERMINE IF IT IS READY BY CHECKING FOR WAITING FOR TRIGGER BIT 5 OF THE OPERATION STATUS REGISTER YOU COULD ELIMINATE THIS STEP BY SIMPLY INSERTING A PAUSE IN THE PROGRAM HOWEVER BY CHECKING THE INSTRUMENT STATUS YOU CAN AVOID TIMING PROBLEMS ALSO ANY OTHER OPERATIONS THAT TAKE TIME WILL GIVE THE MODULE A CHANCE TO COMPLETE PROCESSING CONDITION DATA SPACE 20 RESERVE SPACE FOR READING IN STRING WHILE VAL CONDITION DATA AND 32 lt gt 32 CONTINUE TO LOOP UNTIL BIT 5 VALUE 32 TRUE CMD STATUS OPERATION CONDITION CALL IBWRT SLOTO CMD F IBSTA 0 THEN 1
74. ST MODULE PROGRAMMED IS READY THEN SO ARE THE OTHERS SO JUST CHECK SLOT 2 YOU COULD ELIMINATE THIS STEP BY SIMPLY INSERTING A PAUSE IN THE PROGRAM HOWEVER BY Application Programs 93 600 610 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 710 780 790 800 810 820 830 840 850 860 CHECKING THE INSTRUMENT STATUS YOU CAN AVOID TIMING PROBLEMS ALSO ANY OTHER OPERATIONS THAT TAKE TIME WILL GIVE THE MODULES A CHANCE TO COMPLETE PROCESSING REPEAT OUTPUT Q Slot2 S TATUS OPERATION CONDITION ENTER QSlot2 Condition data UNTIL BIT Condition data 5 TEST FOR 5 TRUE GENERATE A TRIGGER AND MAKE A MEASUREMENT FOR EACH TEST CONDITION FOR Loop 1 TO Num test steps OUTPUT Slot0 TRG SEND Agilent 1B BUS TRIGGER GOSUB Get measurement NEXT Loop count l STOP Get_measurement THIS IS J UST TO SHOW YOU WHERE YOU WOULD ADD CODE TO GET DATA FROM THE MEASUREMENT INSTRUMENT THE MEASUREMENT MUST TAKE LONGER THAN THE PROGRAMMED DWELL TIME OR YOU WILL MISS TRIGGERS WAIT 1 RETU RN END Figure B6 3 Agilent BASIC Program Listing for Application 6 94 Application Programs Application 7 Output Sequencing Without Computer Intervention Overview Of Application When characterizing devices the DUT s performance is measured over a range of power supply voltages This test can be performed without computer intervention by using hardware signals from
75. Subsystem Note The trigger subsystem must be enabled from the Initiate Subsystem or no triggering action will occur TRIG When the trigger subsystem is enabled TRIG generates an immediate trigger signal that bypasses any selected TRIG SOUR and TRIG DEL The trigger will then 1 Initiate a pending level change as specified by CURR LEV TRIG or VOLT LEV TRIG Initiate a pending level change as specified by CURR MODE LIST or VOLT MODE LIST and in accordance with LIST STEP 3 Clear the WTG bit in the Status Operation Condition register 46 Language Dictionary Command Syntax Parameters Examples Query Syntax Related Commands TRIG DEL TRIGger S TARt IMMediate None TRIG TRIG IMM None ABOR CURR MODE CURR TRIG INIT TRG VOLT MODE VOLT TRIG This command sets the time delay between the detection of an event on the specified trigger source and the start of any corresponding trigger action on the power module s output Command Syntax Parameters Default Suffix RST Value Examples Query Syntax Returned Parameters Related Commands TRIG LINK TRIGger STARt DELay lt NRf gt 0 to 65 MIN MAX S 0 TRIG DEL 25 TRIG DEL MAX TRIGger STARt DELay lt NR3 gt ABOR CURR TRIG INIT TRIG IMM VOLT TRIG This command specifies which event conditions within the power module are linked to trigger source events when LINK is the parameter of the TRIG SOUR command Command Syn
76. T 9 Slot0 LIS T VOLT 5 7 0 OUTPUT QSlotO LIS T DWELL 1 2 30 OUTPUT 9 SlotO LIST STEP AUTO OUTPUT Slot0 LIST COUNT INF OUTPUT 9 Slot0 INITIATE ENABLE OCP NO DELAY BEFORE PROTECTION OCCURS ENABLE DETECTION OF OC CONDITION IN THE QUESTIONABLE REGISTER WHERE OC 1 VALUE 2 ENABLES DETECTION ON POSITIVE TRANSITION I E GOING INTO OC ENABLES THE SERVICE REQUEST REGISTER TO GENERATE AN SRQ WHEN ANY EVENT IN THE QUESTIONABLE REGISTER S ASSERTED THE QUESTIONABLE REGISTER VALUE 8 SET TO GET VOLTAGE FROM LIST DOWNLOAD VOLTAGE POINTS DOWNLOAD DWELL TIMES DWELL PACED LIST CONTINUOUSLY REPEAT LIST INF 2 INFINITE ENABLE TRIGGER TO START LIST BEFORE TRIGGERING THE MODULE DETERMINE IF IT IS READY BY CHECKING FOR WAITING FOR TRIGGER BIT 5 OF THE OPERATION STATUS REGISTER YOU COULD ELIMINATE THIS STEP BY SIMPLY INSERTING A PAUSE IN THE PROGRAM HOWEVER BY CHECKING THE INSTRUMENT STATUS YOU CAN AVOID TIMING PROBLEMS ALSO ANY OTHER OPERATIONS THAT TAKE TIME WILL GIVE TNE MODULE A CHANCE TO COMPLETE PROCESSING REPEAT OUTPUT Slot0 STATUS OPERATION CONDITION ENTER Slot0 Condition_data UNTIL BIT Condition data 5 l ISEND Agilent 1B TRIGGER COMMAND TO START LIST OUPUT Slot0 TRIGGER IMMEDIATE END TEST FOR BIT 5 TRUE THIS 15 AN IMMEDIATE TRIGGER WHICH IS ALWAYS ACTIVE THEREFORE IT DOES NOT NEED TO BE SELECTED AS A T
77. TEP ONCE SOURce LIST STEP AUTO ONCE CURR MODE LIST COUN LIST CURR LIST DWEL LIST VOLT VOLT MODE LIST VOLT This command specifies the output voltage points in a list The voltage points are given in the command parameters which are separated by commas Up to 20 points may be entered and the output voltage values specified by the points will be generated in the same order as they were entered Command Syntax SOURce LIST VOLTage lt NRf gt lt NRf gt Parameters See Table 3 2 Default Suffix V Examples LIST VOLT 2 0 2 5 3 0 LIST VOLT MAX 2 5 MIN Query Syntax None Related Commands VOLT MODE LIST VOLT POIN LIST DWEL LIST VOLT POIN This query returns the number of points specified in LIST VOLT Note that it returns only the total number of points not the point values Query Syntax SOURce LIST VOLTage POINts Returned Parameters lt NRI gt Example LIST VOLT POIN Related Commands VOLT MODE LIST VOLT LIST DWEL MEASure Query This query returns the current measured at the power module output terminals or the voltage measured at the sense terminals The query format allows two optional parameters for specifying the expected value and desired measurement accuracy The power module accepts the optional parameters but ignores them Query Syntax MEASure CURRent DC lt NRf gt lt NRf gt MEASure VOLTage DC lt NRf gt lt NRf gt Parameters None Default Suffix A for MEAS CURR V for MEAS VOLT
78. THE VOLTAGE RAMP 2170 2180 CMD TRIGGER IMME DIATE THIS IS AN IMMEDIATE TRIGGER WHICH IS ALWAYS 2190 L LEN CMD ACTIVE THEREFORE IT DOES NOT NEED TO BE 2200 CALL IOOUTPUTS SLOTO CMD L SELECTED AS A TRIGGER SOURCE 2210 IF PCIB ERR 0 THEN ERROR PCIB BASERR 2220 2230 END Application Programs 101 1000 1010 1020 1030 1040 1050 1060 1070 1080 1090 1100 1110 1120 1130 1140 1150 1160 1170 1180 1190 1200 1210 1220 1230 1240 1250 1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370 1380 1390 1400 1410 1420 1430 1440 1450 1460 1470 1480 1490 1500 1510 1520 1530 1540 1550 1560 1570 CONFIGURE THE GPIB CO EOI ENABLED FOR BOTH READ AND WRITE DISABLE AUTO SERIAL POLL INSTRUMENT NAME SLOTO CALL IBFIND INSTRUMENT IF SLOTO lt O THEN PRI 4 5 1 VSTEP VSTART 22 VSTOP 10 RA DW D PTIME 5 ELL RAMPTIME 19 AME SLOTO 6 T COULDN T FIND MODULE STOP 4 4 4 MERGE DECL BAS AS INSTRUCTED IN YOUR NATIONAL INSTRUMENTS GPIB PC MANUAL APPLICATION 3 CONTROLLING VOLTAGE RAMP UP AT TURN ON FOR GWBASIC AND THE NATIONAL INSTRUMENTS GPIB PC INTERFACE CARD PROGRAM N3 BAS HANDLER FOR THE FOLLOWING STRING TO HOLD THE VOLTAGE RAMP STEPS START VOLTAGE FOR RAMP STOP VOLTAGE FOR RAMP TIME IN SECONDS TO CHANGE FROM VSTART TO VSTOP 4 DWELL TIME FOR EACH POINT NCE THE OUTP
79. TO cmd buff strlen cmd buff error handler error cmd buff cmd 1 error iooutputs SLOTO strlen cmd error handler error cmd cmd OUTPUT ON F 104 Application Programs Reset and clear module Start ramp at vstart Use number to string conversion to send real numbers overthe bus as part of the command string Enable output real error iooutputs S LOTO cmd strlen cmd error handler error cmd cmd VOLT MODE LIST F Setto get voltage from List error iooutputs SLOTO cmd strlen cmd error handler error cmd Sending voltage data points requires two steps using the Agilent 1B Command Library The instruction contains both string data and a array First send the string data command header LIST VOLT to the module using iooutputs Then send the real array using iooutputa However you must inhibit the EOI and End of Line terminator after the iooutputs or the module will stop taking data Then re enable them to terminate the iooutputa error ioeoi INTERFACE 0 FK Tum offEOl error handler error Disabling E 01 error ioeol INTERFACE 0 Tum off End of Line termination error handler error Disabling 01 cmd LIST VOLT FK Firstsendthe voltage header string error iooutputs S LOTO cmd strlen cmd error handler error cmd error ioeoi INTERFACE 1 FK TumonEO error handler error Enabl
80. The PTR filter will cause the OPER summary bit to set RQS when CC occurs Then the controller subsequently reads the event register STAT OPER EVEN the register is cleared When CC subsequently goes false the NTR filter causes the OPER summary bit to again set RQS 56 Status Reporting Synchronizing Power Module Output Changes Introduction If you use only the VOLT LEV TRIG and or CURR LEV TRIG commands to trigger output changes you do not need the information in this chapter This chapter gives supplemental information on how you can synchronize power module output changes to internal or external events The output changes can be A change in output voltage level A change in output current level The start of an internally paced list of output voltage or current levels A step to the next level in a list of output voltage or current levels A change in the output state on or off The event to which the output change is synchronized can be any of the following A command from the controller A GPIB bus command e An event that occurs within the power module An event that occurs within another power module An external signal at the mainframe trigger input e An external signal at the mainframe fault inhibit input INH The output synchronization is implemented by the following power module functions Trigger subsystem List subsystem Remote inhibit RI subsystem e Discret
81. To send numeric data number to string conversion must be performed before the IBWRT To read numeric data string to number conversion must be performed after each IBRDY Error handling is accomplished by checking the variable JBSTA If it is less than zero an error has occurred See the GPIB interface documentation for trapping and interpreting this error variable General Setup Information for Microsoft C Using the Agilent 82335A 82990A 61062B GPIB Command Library The address of a module is of type long and is determined the same as with Agilent BASIC For example the address 70501L means 7 is the select code of the GPIB interface 05 is the GPIB address of the mainframe 01 is the slot number secondary address of the module The module expects each command to be terminated by a line feed character 10 and or EOI The default configuration of the GPIB Command Library is carriage return line feed for end of line termination and EOI at the end of aline Therefore the defaults are correct for use with the module The GPIB Command Library supports strings numeric and array data formats However multiple data types cannot be sent in a single command To send both string and numeric data in one command convert all numeric data to strings concatenate with the string data and send the combined string to the module To read multiple data types read the data into a string and then manipulate the string by converting each piece into the ap
82. UT STAYS AT THE LAST VOLTAGE POINT AFTER ITS DWELL TIME EXPIRES THE DWELL TIME OF THE LAST POINT IS NOT PART OF THE TRANSITION TIME THEREFORE DIVIDE THE TOTAL TIME BY 19 POINTS NOT 20 YOU WANT THE SAME DWELL TIME FOR EVERY POINT IN THE LIST SO YOU NEED TO DOWNLOAD ONLY 1 DWELL TIME SINCE THE NATIONAL INSTRUMENTS GPIB PC WORKS WITH STRINGS THE RAMP DATA MUST BE CONSOLIDATED INTO A SINGLE STRING WHICH CONTAINS ALL THE POINTS SEPARATED BY COMMAS FO R 1 1 0 20 MAKES THE STRING EQUIVALENTS OF THE VSTEP VSTEP STR VSTART VSTOP VSTART 20 VOLTAGE POINTS AND CONCATENATES THEM ONLY IF lt 20 THEN VSTEP VSTEP NEXT I 4 C CA D RST CLS STATUS PRESET LL IBWRT SLOTO 6 CMD F IBSTA 0 THEN GOTO 1960 D STR VSTART LL IBWRT SLOTO 6 CMD F IBSTA 0 THEN GOTO 1960 D CURR 1 LL IBWRT 51070 CMD F IBSTA 0 THEN GOTO 1960 D 00 ON LL IBWRT SLOTO 6 CMD F IBSTA 0 THEN GOTO 1960 D VOLT MO DE LIST LL IBWRT SLOTO 6 CMD F IBSTA 0 THEN GOTO 1960 D LIST VOLT VSTEP LL IBWRT SLOTO CMD F IBSTA 0 THEN GOTO 1960 D LIST DWELL STR DWELL 102 Application Programs 4 4 4 FIRST 19 POINTS EACH FOLLOWED BY A COMMA THE LAST POINT IS NOT FOLLOWED BY A COMMA RESET AND CLEAR MODULE START RAMP AT VSTART USE NUMBER TO STRING CONVERSION TO
83. V el 1MMediate AMPlitude SOURce VOLTage LEVel 1MMediate AMPLitude MAX SOURce VOLTage LEVel 1MMediate AMPLitude MIN Returned Parameters lt NR3 gt VOLT returns the presently programmed immediate voltage level VOLT MAX and VOLT MIN return the maximum and minimum programmable immediate voltage levels Related Commands RST VOLT MODE This command enables or disables list subsystem control over the power module output voltage When programmed with FIX this command prevents the output voltage from being controlled by the sequencing of points specified by LIST VOLT If the LIST parameter is used then the output voltage may be changed by the subsequent execution of a list However the list mode does not prevent the output voltage from being setby VOLT IMM and RCL Note VOLT MODE LIST is an implied ABORT command Command Syntax SOURce VOLTage MODE lt CRD gt Parameters FIXed LIST RST Value FIX Examples VOLT MODE LIST VOLT MODE FIX Query Syntax SOURce VOLTage MODE Returned Parameters FIX LIST Related Commands VOLT LIST RCL VOLT PROT This command sets the overvoltage protection OVP level of the power module If the output voltage exceeds the OVP level then the power module output is disabled and the Questionable Condition status register OV bit is set see Chapter 4 Status Reporting An overvoltage condition can be cleared with the OUTP PROT CLE command after the condit
84. amming NORMal causes the relay output polarity to be the same as the power module output Programming REVerse causes the relay output polarity to be opposite to that of the power module output If OUTP STAT ON when either relay command is sent the power module output voltage is set to 0 during the time that the relays are changing polarity If the power module is not configured for the relay connector sending either relay command generates an error Command Syntax OUTPut RELay POLarity lt CRD gt Parameters NORMal REVerse RST Value NORM Examples OUTP REL POL NORM Query Syntax OUTPut RELay POLarity Returned Parameters NORM REV Related Commands OUTP STAT SAV Language Dictionary 41 OUTP TTLT This command enables or disables the power module Trigger Out signal which is available at a BNC connector on the rear of the mainframe Trigger Out is the logical OR of all the power module TTL Trig signals see Chapter 5 Synchronizing Power Module Output Changes It also may be selected as a trigger input see TRIGger SOURce Command Syntax OUTPut TTLTrg STATe lt bool gt Parameters 0111 OFF ON RST Value OFF Examples OUTP TTLT1 OUTP TTLT OFF Query Syntax OUTPut TTLrg STATe Returned Parameters 011 Related Commands OUTP TTLT LINK OUTP TTLT SOUR OUTP TTLT LINK This command specifies which events within the power module are linked to TTLTrg source events when LINK is the parameter for the OUTP TTLT SOUR command
85. ars it Status Reporting 53 Status Byte Register This register summarizes the information from all other status groups as defined in the JEEE 488 2 Standard Digital Interface for Programmable Instrumentation standard The bit configuration is shown in Table 4 2 The register can be read either by a serial poll or by STB Both methods return the same data except for bit 6 Sending STB returns MSS in bit 6 while polling returns RQS in bit 6 The RGS Bit Whenever the power module requests service it sets the SRQ interrupt line true and latches RQS into bit 6 of the Status Byte register When the controller services the interrupt RQS is cleared inside the register and returned in bit position 6 of the response The remaining bits of the Status Byte register are not disturbed The MSS Bit This is a real time unlatched summary of all Status Byte register bits that are enabled by the Service Request Enable register MSS is set whenever the power module has at least one reason and possible more for requesting service Sending STB reads the MSS in bit position 6 of the response No bits of the Status Byte register are cleared by reading it Determining the Cause of a Service Interrupt You can determine the reason for an SRQ by the following actions Use a serial poll or the STB query to determine which summary bits are active Read the corresponding Event register for each summary bit to determine which events caused the summ
86. ary bit to be set When an Event register is read it is cleared This also clears the corresponding summary bit The interrupt will recur until the specific condition that caused the each event is removed If this is not possible the event may be disabled by programming the corresponding bit of the status group Enable register or NTRIPTR filter A faster way to prevent the interrupt is to disable the service request by programming the appropriate bit of the Service Request Enable register Output Queue The Output Queue is a first in first out FIFO data register that stores power module to controller messages until the controller reads them Whenever the queue holds one or more bytes it sets the MAV bit 4 of the Status Byte register If too many unread error messages are accumulated in the queue a system error message is generated see Chapter 6 Error Messages The Output Queue is cleared at power on and by CLS Location Of Event Handles Event handles are signals within the interface that can be used for triggers for a Trigger Out signal or for a DFI signal Those event handles derived from signals in the Status Subsystem are shown as circled numbers in Figure 4 1 Other event handles are described in Chapter 5 Synchronizing Power Module Output Changes 54 Status Reporting Initial Conditions At Power On Status Registers When the power module is turned on a sequence of commands initializes the status registers Table
87. ation Query Meaning and Type Identification System Interface Description This query requests the power module to identify any options that are installed Options are identified by number as shown below A 0 indicates no options are installed Query Syntax OPT Returned Parameters lt AARD gt Related Commands None PSC Meaning and Type Power on Status Clear Device Initialization Description This command controls the automatic clearing at power on the following registers see Chapter 4 Status Reporting for register details Service Request Enable Standard Event Status Enable If the command parameter or any non zero value then the above registers are cleared at power on If the command parameter 0 then the above registers are not cleared but are programmed to their last state prior to power turn on This is the most common application for PSC and enables the power module to generate an SRQ Service Request interrupt at power on Command Syntax PSC bool Parameters 01 1I OFFI ON Example PSC 0 PSC 1 Query Syntax PSC Returned Parameters lt NRI gt 011 Related Commands ESE SRE CAUTION PSC causes a write cycle to nonvolatile memory If PSC is programmed to 0 then the ESE and SRE commands also cause a write cycle to nonvolatile memory The nonvolatile memory has a finite number of write cycles see Table 1 2 in the power module User s Guide Programs that repeatedly write to nonvolatile
88. by the status subsystem Since the delay applies to CC status it also delays the OCP overcurrent protection feature The OVP overvoltage protection feature is not affected by this delay Command Syntax OUTPut PROTection CLEar OUTPut PROTection DELay lt NRf gt Parameters OUTP PROT CLE none OUTP PROT DEL 0 to 32 767 MINI MAX Default Suffix 5 RST Value 100 milliseconds Examples OUTP PROT CLE OUTP PROT DEL 75E 1 Query Syntax OUTP PROTection CLEar None OUTPut PROTection DELay OUTPut PROTection DELay MINimum OUTPut PROTection DELay MAXimum Returned Parameters lt NR3 gt Related Commands OUTP PROT CLE None OUTP PROT DEL SAV OUTP REL This command is valid only if the power module is configured for the optional relay connector Programming ON closes the relay contacts programming OFF opens them The relay is controlled independently of the output state If the power module is supplying power to a load that power will appear at the relay contacts during switching If the power module is not configured for the relay connector sending either relay command generates an error Command Syntax OUTPut RELay STATe lt bool gt Parameters 0111 OFF ON RST Value 0 Examples OUTP REL1 OUTP REL OFF Query Syntax OUTPut RELay Returned Parameters 011 Related Commands OUTP STAT RCL SAV OUTP REL POL This command is valid only if the power module is configured for the optional relay connector Progr
89. ck of status FK todoaninteger bit test Application Programs 105 while int condition data amp amp WTG 2 0 Loop until bit5 value 32 is true Send trigger command to start List and generate the voltage ramp cmd z TRIGGER IMMEDIATE FK This is an immediate trigger which is always error iooutputs S LOTO cmd strlen cmd fF active Therefore itdoes notneedto be 5 error handler error cmd F selected as a trigger source ul error handler error bad string FK Thisis a generalized error checking routine 5 int error char bad string if error 0 printf Agilent 1B error while sending or receiving s n bad string printf Error amp 96d s n error errstr error 106 Application Programs FF APPLICATION 3 CONTROLLING VOLTAGE RAMP UP AT TURN ON FOR MICROSOFT C AND THE NATIONAL INSTRUMENTS GPIB PC INTERFACE CARD PROGRAM N3 C Configure the GPIB COM handler for the following EO enabled for both read and write include lt stdio h gt Disable auto serial poll include lt stdlib h gt include lt string h gt include decl h define ERR 1 15 fF Error detected as bit 15 of ibsta define NUM PTS 20 FK The number of points in the voltage List define MAX LEN 255 Ff X Maximum length of a string 2255 characters SMALL STRING 15 When you need a small string of 15 characters define WTG 32 F Waiting for Trigger WTG bit 5
90. clarify or enhance your understanding of the original command or query Order of Presentation The dictionary is organized as follows IEEE 488 2 common commands in alphabetical order Subsystem commands COMMON Commands Common commands begin with an and consist of three letters command or three letters and a query Common commands are defined by the IEEE 488 2 standard to perform some common interface functions The Agilent Series 6610xA power modules respond to the 13 required common commands that control status reporting synchronization and internal operations The power modules also respond to five optional common commands controlling triggers power on conditions and stored operating parameters Subsystem Commands Subsystem commands are specific to power module functions They can be a single command or a group of commands The groups are comprised of commands that extend one or more levels below the root The description of subsystem commands follows the description of the common commands Language Dictionary 23 Description Of Common Commands Figure 3 1 shows the common commands and queries These commands are listed alphabetically in the dictionary If a command has a corresponding query that simply returns the data or status specified by the command then both command and query are included under the explanation for the command If a query does not have a corresponding command or is functionally different from the
91. cription This command resets the power module to a factory defined state as defined below RST also forces an ABORt command COMMAND STATE COMMAND _ STATE COMMAND STATE CAL AUTO OFF OUTP STAT OFF OUTP TTLT LINK OFF CAL STAT OFF OUTP DFI OFF TRIG DEL 0 CURR LEV IMM OUTP DFI SOUR LINK TRIG LINK OFF CURR PROT STAT OFF OUTP DFI LINK SUM3 TRIG SOUR BUS CURR MODE FIX OUTP PROT DEL VOLT LEV IMM 0 DISP WIND STAT ON OUTP REL STAT OFF VOLT MODE FIX OFF OUTP REL POL NORM VOLT PROT LEV MAX LIST STEP AUTO OUTP TTLT STAT OFF Model dependent value See LIST COUN OUTP TTLT SOUR BUS Table 3 2 28 Language Dictionary Command Syntax RST Parameters None Query Syntax None Related Commands PSC SAV SAV Meaning and Type Save Device State Description This command stores the present state of the power module to a specified location in memory Up to 10 states can be stored Storage locations 0 through 4 are in nonvolatile memory and locations 5 through 9 are in volatile memory If a particular state is desired at power on it should be stored in location 0 It then will be recalled at power on if the power module configuration switch is set for this mode of operation see the power module User s Guide The following power module states are stored by SAV CAL AUTO LIST COUN OUTP REL STAT TRIG LINK CURR LEV IMM LIST STEP OUTP REL POL TRIG SOUR CURR MODE OUTP STAT OUTP TTLT STAT VOLT LEV IMM
92. cycles see Table 1 2 in the power module User s Guide Programs that repeatedly write to nonvolatile memory can eventually exceed the maximum number of write cycles and may cause the memory to fail STB Meaning and Type Status Byte Device Status Description This query reads the Status Byte register which contains the status summary bits and the Output Queue MAV bit Reading the Status Byte register does not clear it The input summary bits are cleared when the appropriate event registers are read see Chapter 4 Status Reporting for more information The MAV bit is cleared at power on or by CLS A serial poll also returns the value of the Status Byte register except that bit 6 returns Request for Service RQS instead of Master Status Summary MSS A serial poll clears RQS but not MSS When MSS is set it indicates that the power module has one or more reasons for requesting service Bit Configuration of Status Byte Register Bit Position 7 6 5 4 3 2 1 Condition OPER MSS ESB QUES 7 RQS Bit Weight 128 64 32 16 8 4 2 1 ESB Event status byte summary M Message available MSS Master status summary OPER Operation status summary QUES Questionable status summary RQS Request for service Also represents RQS These bits are always zero Query Syntax STB Returned Parameters NRI Register b
93. d_buff VOLT vstart FK Start ramp at vstart Use number to string conversion to send ibwrt slot cmd buff strlen cmd buff if ibsta amp ERR error cmd buff cmd 1 ibwrt slot0 cmd strlen cmd if ibsta amp ERR error cmd cmd OUTPUT ON ibwrt slot0 cmd strlen cmd if ibsta amp ERR error cmd real numbers over the bus as part of the command string Ff Enable output Application Programs 107 cmd VOLT MODE LIST Set to get voltage from List ibwrt sloto cmd strten cmd if ibsta amp ERR error cmd strcpy viist LIST VOLT Start with the command header for the voltage List for i 1 i lt NUM_PTS i F The Loop calculates the string sprintf vpoint vstart vstop vstart NUM_PTS 1 f equivalents of the voltage List strcat vlist vpoint points and concatenates them for only the first 19 because there ul fF should notbe comma afterthe sprintf vpoint 9f vstop last point Do the last point strcat vlist vpoint separately with no comma x ibwrt slotO vlist strlen vlist FK Download voltage List points if ibsta amp ERR error vlist sprintf cmd buff LIS T DWELL f dwell F Download 1 dwell time Use numberto ibwrt slot0 cmd buff strlen cmd buff string conversion to send the real if ibsta amp ERR FK number over the bus as part of the error cmd_bu
94. e Note The optional Agilent 66001A MPS Keyboard does not display optional headers Query Indicator Following a header with a question mark turns it into a query VOLT VOLT PROT If a query contains a parameter place the query indicator at the end of the last header VOLT PROT MAX Message Unit Separator When two or more message units are combined into a compound message separate the units with a semicolon STATus OPERation QUEStionable You can combine message units only at the current path of the command tree see Traversing the Command Tree Root Specifier When it precedes the first header of a message unit the colon becomes the root specifier It indicates that the parser is at the root or top node of the command tree Note the difference between root specifiers and header separators in the following examples OUTP PROT DEL 1 colons are header separators OUTP PROT DEL 1 Only the first colon is a root specifier OUTP PROT DEL 1 VOLT 12 5 Only the third colon is a root specifier Message Terminator A terminator informs SCPI that it has reached the end of a message Three permitted messages terminators are newline NL which is ASCII decimal 10 or hex OA end or identify END both of the above lt NL gt lt END gt In the examples of this guide there is an assumed message terminator at the end of each message If the terminator needs to be shown it is indicated as NL
95. e The computer sends a trigger command to the first module The first module simultaneously sends a backplane trigger to other two modules and goes to 15 V The second module receives the backplane TTL Trigger and immediately goes to 15 V The third module receives the backplane TTL Trigger delays 50 ms and then goes to 5 V MPS Set Up Module in slot 0 The module is connected to 15 V on the DUT The initial voltage setting is The module listens for the computer to send a trigger command Upon receipt of the trigger command the module goes to 15 V Also upon receipt of the trigger command the module generates a backplane TTL Trigger Module in slot 1 The module is connected to 15 V on the DUT The initial voltage setting is The module listens for a backplane TTL Trigger Upon receipt of the trigger the module goes to 15 V 70 Application Programs Module in slot 2 The module is connected to 5 V on the DUT The initial voltage setting is The module listens for a backplane TTL Trigger The trigger delay is programmed to 50 ms Upon receipt of the trigger the module waits the trigger delay time and then goes to 5 V Variations On This Implementation 1 The modules could be set to generate SRQ when the last module 5 V reaches its final output value This would notify the computer that power has been applied to the DUT and the testing can begin 2 To provide a delay between the appl
96. e bits in both NTR and PTR registers are set to 0 then no transition of that bit at the Operation Condition register can set the corresponding bit in the Operation Event register Note Setting a bit in the value of the PTR or NTR filter can of itself generate positive or negative events in the corresponding Operation Event register Command Syntax STATus OPERation NTRansition lt Nrf gt STATus OPERation PTRansition lt NRf gt Parameters 0 to 32727 Suffix None Default Value 0 Examples STAT OPER NTR 32 STAT OPER PTR 1312 Query Syntax STAT OPER NTR STAT OPER PTR Returned Parameters lt NR1 gt Register value Related Commands STAT OPER ENAB STAT PRES This command sets all defined bits in the Status Subsystem PTR registers and clears all bits in the subsystem NTR and Enable registers STAT OPER PTR is set to 1313 and STAT QUES PTR is set to 1555 Command Syntax STATus PRESet Parameters None Examples STAT PRES Query Syntax None Related Commands None Status Questionable Registers The bit configuration of all Status Questionable registers is as follows configuration 9 Questionakle Registers Bit Position Condition 11 UNS NU T m NU 19 BitWeight 1024 512 Weight unregulated Note 44 Language Dictionary BitWeight 1024 512 256 128 E NU Not used Overcurrent protection circuit has mm oT RETE status i exists OV Overvoltage protecti
97. e eie rken E eerie EEEE 59 InggerlInand TrgperQUt 5 E REUS ORA Een icut return 60 Fast Subsystem cu eoe i Ie OT M 61 Basic Steps of List Sequencing iranis ironien n A a E R trennen rene enne neret trennen enne 61 Programming the List Output Levels te ete pepererat leti Rete e bete piene 61 Programming List Intervals roisse ea i ere eb Tp ie eb petens 61 Automatically Repeating a List neriesi inse nennen nest reet eene nennt 62 TPIS ering OUI RU UERBO QUE HINOE Ie 62 Dwell Paced Lists eire PIRE ERROR EE ETERS 62 Trigger Paced Lists Render ien be UU ted iet ic det re UR 62 DFI Discrete Fault Indicator Subsystem esses eene eene nennen ennt 64 RI Remote Inhibit Subsystem tenter nete tentes 64 SCPL Command Completion fire pedites 64 Error Messages Power Module Hardware Error 2222 4 120 01 een enne neen nennen trennen enne 65 System Error Messages 5 eret Ue ERREUR dece beet aie 65 SCPI Conformance Information sess 67 Application Programs ore rer rU ghe APPEAR ERU Me 69 Introduction About This Guide You will find the following information in the rest of this guide Chapter 2 Introduction to SCPI messages structure syntax and data formats Examples of SCPI
98. e error handler is then passed the float that is returned from each call to the library include amp lt stdio h gt include amp lt decl h gt define ERR l amp lt amp lt 15 Error is detected as bit i5 of ibsta int module address Device is configured in the GPIB COM handler Use ibfind to assign a value to module address char cmd cmd VOLT 5 ibwrt MODULE ADDRESS cmd strlen cmd if ibsta amp ERR error handler Sending the Command VOLT 5 in C Introduction To Programming 19 Receiving Data from the Module The following screens show how to enter data from the module with various interfaces 2100 ENTER 70501 MEASUREMENT where 70501 means 7 is the select code of the GPIB interface 21 10 05 is the GPIB address of the mainframe 01 is the slot number 2120 secondary address of the module MEASUREMENT is a real number 2130 sent by the module Seer GWBASIC Agilent 82335A 829904 61062B GPIB Command Library 3 2100 MODULE ADDRESS 70501 2110 CALL IOENTER MODULE ADDRESS MEASUREMENT 2120 IF PCIB ERR amp gt 0 THEN ERROR PCIB BASERR ERROR TRAP eK GWB ASIC National Instruments GPIB Interface 2100 MEASUREMENTS SPACE 20 DRIVER CAN ONLY READ STRINGS SO RESERVE 2110 SPACE IN A STRING 2120 CALL IBRD MODULE ADDRESS MEASUREMENTS 2130 IFIBSTA amp lt 0 GOTO 5000 TRAP ERROR WITH ERROR HANDLER AT LINE 5
99. e fault indicator DFI subsystem Trigger Subsystem Two simplified models of the trigger subsystem are presented The first model shows how the trigger subsystem functions during fixed mode output This mode occurs when VOLT MODE FIX or CURR MODE FIX is in effect see Chapter 3 Language Dictionary In this mode of output control each triggered output voltage or current value is explicitly specified by a triggered level command for example VOLT TRIG 20 or CURR TRIG 1 55 The trigger then causes the output to change to this pending triggered level The second model shows the difference in trigger subsystem operation during list mode output This mode occurs when the VOLT MODE LIST or CURR MODE LIST command is programmed see List Subsystem further in this chapter for an explanation of lists In this mode of output operation the triggered output voltage or current levels are specified within a list and the trigger controls the sequencing through the values in the list Model of Fixed Mode Trigger Operation Figure 5 1 is a simplified model of trigger subsystem operation when the power module is programmed for fixed mode output The rectangular boxes represent states The arrows show the transitions between states These are labeled with the input or event that causes the transition to occur Synchronizing Power Module Output Changes 57 Idle State When the power module is turned on the trigger subsystem is in the idle state In
100. e most important GPIB documents are your controller programming manuals GW BASIC GPIB Command Library for MS DOS etc Refer to these for all non SCPI commands for example Local Lockout The following are two formal documents concerning the GPIB interface ANSI IEEE Std 488 1 1987 IEEE Standard Digital Interface for Programmable Instrumentation Defines the technical details of the GPIB interface While much of the information is beyond the need of most programmers it can serve to clarify terms used in this guide and in related documents e ANSI IEEE Std 488 2 1987 IEEE Standard Codes Formats Protocols and Common Commands Recommended as a reference only if you intend to do fairly sophisticated programming Helpful for finding precise definitions of certain types of SCPI message formats data types or common commands The above two documents are available from the IEEE Institute of Electrical and Electronics Engineers 345 East 47th Street New York NY 10017 USA Introduction 7 VXIplug amp play Power Products Instrument Drivers VXIplug amp play instrument drivers for Microsoft Windows 95 and Windows NT are now available on the Web at http www agilent com find drivers These instrument drivers provide a high level programming interface to your Agilent Technologies electronic load VXIplug amp play instrument drivers are an alternative to programming your instrument with SCPI command strings Because the instrument drive
101. ec eot e dede eee reds 42 SPAT OPER CEHERURME E OR EEORNIE ER tt terae 43 STAT OPERICONDS iiie pede tese it eg eed iere i eei pee e ves o ete 43 eg RUE ERREUR eie ed diei tend 43 STAT OPERINTR iine he LEER e een ease 44 STAT OPER PER rin nh POO RUE OE Pee E EUR 44 STAT PRES nni URBE UU UR a Uti tec A 44 STAT QUES 2 isco ance eet OP arte ee aee I eite x ee e etel e e 45 eet A es Be ue aeu 45 STAT QUES ENAB oett Rd e P DER RUE Ge pH Rede 45 SEAT QUES NTR petet ete ee ete es eo I e d p RU e eee tna 45 STAT OUES BPTR uet pd et eet abere E ERROR 45 SYS FERR usen Res eg MU eodeni tute igeo ud 46 SYST VERS nO OO T te p E atra 46 Trigger SUDSySle m se mace bitum Udine tice tL Ue tidie cdd 46 gg E 46 TRIG DEL nS tec e aee epe Roki acd etu 47 TRIGEINK vetet erp eu ame opt 47 TRIG SOUR ped 47 Voltage Subsysteti qu E EUR SER IE RISE p gir 48 MOLT tei UU e DI UIS DUO ts Ses dee a en eee 48 VOLT MODE rre Dre RP ater oy sae Ru eet peris 48 NOET BROT uem eere tee iE teri stie On peni 48 VOLT SENS SOUR 5 Sancho en oU aded tare eet epe 49 VOL TERUG
102. erface is now ready to accept either CLEAR or DELAY as the next header If you now enter CLEAR you have reached the end of the command string The active header path remains at CLEAR If you wished you could have entered CLEAR DELAY 20 and it would be accepted The entire message would be OUTPUT PROTECTION CLEAR DELAY 20 The message terminator after DELAY 20 returns the path to the root The Effect of Optional Headers If a command includes optional headers the interface assumes they are there For example if you enter OUTPUT OFF the interface recognizes it as OUTPUT STATE OFF see Figure 2 2 This returns the active path to the root OUTPUT But if you enter OUTPUT STATE OFF then the active path remains at STATE This allows you to send OUTPUT STATE OFF PROTECTION CLEAR in one message If you tried to send OUTPUT OFF PROTECTION CLEAR the header path would return to OUTPUT instead of PROTECTION Introduction To Programming 13 The optional header SOURCE precedes the current list and voltage subsystems see Figure 3 2 This effectively makes CURRENT LIST and VOLTAGE root level commands Note The optional Agilent 66001 Keyboard does not display optional headers Moving Among Subsystems In order to combine commands from different subsystems you need to be able to restore the active path to the root You do this with the root specifier For example you could clear the output protection and check the stat
103. ers in the module output can quickly discharge the module s output capacitors and any capacitance in the DUT Implementation Details How The MPS Implements The Solution modules are set to listen for a backplane TTL Trigger When any module detects a change in status from CV to CC it sends out a backplane TTL Trigger When the 5 V module receives the trigger it immediately goes to 0 V When the 15 V and 15 V modules receive the trigger they wait the trigger delay time and then go to Note Any module can generate both the backplane TTL Trigger signal and be triggered by that same signal 74 Application Programs MPS Set Up Module in slot 0 The module is connected to 15 V on the DUT The initial voltage setting is 15 V The module monitors its status The module will generate a backplane TTL Trigger on CV to CC crossover The module listens for a backplane TTL Trigger The trigger delay is programmed to 15 ms Upon receipt of the trigger the module waits the trigger delay time and then goes to 0 V Module in slot 1 The module is connected to supply 15 V to the DUT The initial voltage setting is 15 V The module monitors its status The module will generate a backplane TTL Trigger on CV to CC crossover The module listens for backplane TTL Trigger The trigger delay is programmed to 15 ms Upon receipt of the trigger the module waits the trigger delay time and then goes to Module in
104. esponding current limit could be programmed 2 Overcurrent protection could be enabled to protect a faulty DUT 3 The module could generate an SRQ when it finishes changing voltage for each point in the List based on the STC Step Completed status bit which indicates when the module has completed executing the next point in the List The SRQ could tell the computer to get a measurement from the measurement instrument 4 The module could be told to output its next List point in response to an external or backplane TTL Trigger see next application Application Programs 91 GPIB Trigger Backplane TTL Trigger MPS GPIB Mainframe Make a Measurement Measurement Instrument E lS 12V 12V DUT V Figure B6 1 Block Diagram of Application 6 List Point 1 i List Point 2 A List Point 3 Computer Trigger Command iu 5 25 V a 5v pina 4 75 V 9 Y MPS Mainframe 44 Backplane TTL Trigger 12 V 12 V 12 V 22 Module Slot 1 12 V 12 V 12 V Module Slot2 OV Computer Gets Reading from DMM Figure B6 2 Timing Diagram of Application 6 92 Application Programs 10 20 30 40 50 60 10 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 210 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 APP
105. ff f command string cmd LIST STEP AUTO FK Dwelt paced List ibwrt slot0 cmd strlen cmd if ibsta amp ERR error cmd cmd INITIATE fF Enable trigger to start List ibwrt slot0 cmd strlen cmd if ibsta amp ERR error cmd Before triggering the module determine if it is ready by checking for Waiting for Trigger bit 5 of the Operation Status Register You could eliminate this step by simply inserting a pause in the program However by checking the instrument status you can avoid timing problems Also any other operations that take time will give the module a chance to complete processing do cmd STATUS OPERATION CONDITION ibwrt slot0 cmd strlen cmd if ibsta amp ERR error cmd ibrd slot0 condition data SMALL STRING Allow to read SMALL STRING bytes which is more if ibsta amp ERR enough Note that first byte willbe a sign error condition_data fF 50 you must convert the string to float then to int FK do an integer bit test while int atof condition_data amp amp WTG 0 Loop until WTG bit 5 value 32 is true ff Send trigger command to start List and generate the voltage ramp cmd TRIGGER IMMEDIATE FK This is an immediate trigger which is always sl ibwrt slot0 cmd strlen cmd fF active Therefore it does not need to be if ibsta amp ERR F selected as a trigger source 4 error cmd
106. ge without notice 1 2 3 Contents Introduction About this Guide entere e tees eee docte de idee tede eco odere eee ese 7 bore EDDIE 7 External erre oe RH a E ERR ET RO 7 VXIPlug amp Play Power Products Instrument Drivers 8 Introduction to Programming GPIB Capabilities of the Power Module essere nennen ener een 9 Module GPIB Addtes ete eter itp e ee i n ede ei 9 Introduction to SCPL ie ae Eher e eee 9 Conventionsc see nee oe 9 Types of SCPI eee ERR PUER 10 SCPL Commands doe D eU UE eoi nt nU Ete ns ieri ue 10 Structure of SCPL ede ec ate edet i Sa check subd 10 The Message Units dep ARI RBS 10 Combining Message Units te ette ret ee ri hetero 10 Parts of SCPI Mess ge etre erepto eene deti citt desee iret eet 11 len e 11 Query Indicator misses es ve ese E COR OR RERO SI e ger oec Ee er ROS EE UN 12 Message Unit Separators sx x ttr eet EE EE e ED stipe ES 12 Root Spec Mier eoe e gu One oie RO Goan 1
107. gister are logically ORed to cause the Event Summary Bit ESB of the Status Byte register to be set See Chapter 4 Status Reporting for descriptions of all three registers Bit Configuration of Standard Event Status Enable Register Bit Position 7 6 5 4 3 2 1 0 BitName PON 0 EXE DDE QYE 0 orc BitWeight 128 64 32 16 8 4 2 1 Command error DDE Device dependent error EXE Execution error OPC Operation complete PON Power on QYE Query error Command Syntax Parameters Power On Value Suffix Example Query Syntax Returned Parameters Related Commands ESE lt NRf gt 0 to 255 See PSC None ESE 129 ESE NR1 Register value ESR PSC STB If PSC is programmed to 0 then the ESE command causes a write cycle to nonvolatile memory The nonvolatile memory has a finite maximum number of write cycles see in the power module User s Guide Programs that repeatedly cause write cycles to nonvolatile memory can eventually exceed the maximum number of write cycles and may cause the memory to fail ESR Meaning and Type Event Status Register Device Status Description This query reads the Standard Event Status Event register Reading the register clears it The bit configuration of this register is the same as the Standard Event Status Enable register See Chapter 4 Status Reporting for a detailed exp
108. he status OPC bit to be true Therefore as far as triggers and lists are concerned OPC is false whenever the trigger subsystem is in the Initiated state However OPC is also false if there are any commands pending within any other subsystems For example if you send CURR TRIG 1 5 after a VOLT LIST command completion of the CURR TRIG command will not set OPC if the list command is still executing Note For a detailed discussion of WAI OPC and OPC see Device Controller Synchronization Techniques in ANSITEEE Std 488 2 1987 64 Synchronizing Power Module Output Changes Error Messages Power Module Hardware Error Messages Front panel error messages resulting from selftest errors or runtime failures are described in the power module User s Guide System Error Messages System error messages are read back via the SYST ERR query The error number is the value placed in the power module error queue SYST ERR returns the error number into a variable and combines the number and the error message into a string Table 6 1 lists the system errors that are associated with SCPI syntax errors and interface problems Information inside the brackets is not part of the standard error message but is included for clarification When system errors occur the Standard Event Status register see Chapter 4 Status Reporting records them as follows Standard Event Status Register Error Bits Bit s Error Code Error Type Bit Set Error Code Error T
109. her commands take both the command and query form The commands are listed in alphabetical order and the commands within each subsystem are grouped alphabetically under the subsystem ABOR This command cancels any trigger actions presently in process Pending trigger levels are reset equal to their corresponding immediate values ABOR also cancels any programmed lists that may be in process ABOR also resets the WTG bit in the Operation Condition Status register see Chapter 4 Status Reporting If INIT CONT ON has been programmed the trigger subsystem initiates itself immediately after ABORt thereby setting WTG ABOR is executed at power turn on and upon execution of RCL RST or any implied abort command see List Subsystem Command Syntax ABORt Parameters None Examples Query Syntax None Related Commands INIT RST TRG TRIG Language Dictionary 31 ROOT ROOT 1 1 SYSTem ERRor CALibrat AUTO VERSion CURRent DATA TRIGger STARt IMMediate PASScode DELay iSAVE LINK STATe S0URce VOLTage LEVel PROTection SOURce CURRent LEVel IMMediate AMPLitude MODE TRIGgered DISPlay WINDow STATe STATe INITiate p M ust COUNT CONTinuous CURRent pi cl Re CURRent POINtS Tage Dc DWELI POINts OUTPut STATe STEP DFI STATe VO
110. ication of the 15 V and the 15 V bias you can program different trigger delays into modules 2 and 3 The delay time will be relative to the module in slot 0 3 To get all three modules to apply power to the DUT at the same time simply eliminate the trigger delay on the 5 V module 4 When modules need to be connected in parallel to increase current they will also need to be synchronized so that they all apply power simultaneously To get modules in parallel to apply power at the same time use the approach described in this example but eliminate any trigger delays GPIB Trigger Backplane TTL Trigger MPS Mainframe Figure B1 1 Block Diagram of Application 1 Application Programs 71 Computer D Trigger response 3 ms Trigger Command Q 15 V Module 500 ov MPS Mainframe Backplane j TTL Trigger i 15 V lt gt Module O Slot ov 5 Module 51012 OV 50 ms Trigger Delay Figure B1 2 Timing Diagram of Application 1 72 Application Programs 10 20 30 40 50 60 10 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 210 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 APPLICATION 1 SEQUENCING MULTIPLE MODULES DURING POWER UP PROGRAM APP 1 ASSIGN 51010 TO 70500 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 00 ASSIGN Slo
111. ice 223 Too much data out of memory block string or expression too long 241 Hardware missing device specific 310 System error 330 Self test failed 350 Too many errors errors lost due to queue overflow 400 Query error generic 410 Query INTERRUPTED query followed by DAB or GET before response complete 420 Query UNTERMINATED addressed to talk incomplete programming message received 430 Query DEADLOCKED too many queries in command string 440 Query UNTERMINATED after indefinite response 66 Error Messages SCPI Conformance Information Note See Chapter 3 Language Dictionary for command syntax SCPI Version This power module conforms to Version 1990 0 SCPI Confirmed Commands ABOR CAL AUT CAL STAT DISP WIND STAT DISP WIND STAT INIT IMM INIT CONT INIT CONT MEAS CURR DC MEAS VOLT DC OUTP STAT OUTP STAT OUTP PROT CLE OUTP PROT DEL OUTP PROT DEL OUTP TTLT STAT OUTP TTLT STAT OUTP TTLT LINK OUTP TTLT LINK OUTP TTLT SOUR OUTP TTLT SOUR STAT OPER EVEN STAT OPER COND STAT OPER ENAB STAT OPER ENAB STAT OPER NTR STAT OPER NTR STAT OPER PTR STAT OPER PTR STAT PRES STAT QUES EVEN STAT QUES COND STAT QUES ENAB STAT QUES ENAB SOUR CURR LEV IMM AMPL SOUR CURR LEV IMM AMPL SOUR
112. ime 0 5 s 19 2V Os 0 5 6 Time in seconds Figure 3 3 Generating the Desired Voltage Ramp for Application 3 80 Application Programs 10 20 30 40 50 60 10 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 210 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 APPLICATION 3 CONTROLLING VOLTAGE RAMP UP AT TURN ON PROGRAM APP_3 ASSIGN 51010 To 70500 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 00 OPTION BASE 1 DIM V Step 20 ARRAY TO HOLD THE VOLTAGE RAMP STEPS l Vstart 2 START VOLTAGE FOR RAMP Vstop 10 VOLTAGE FOR RAMP Ramp_time 5 SECONDS TO CHANGE FROM Vstart TO Vstop IN SECONDS Dwell Ramp time 19 SINCE THE OUTPUT STAYS AT THE LAST VOLTAGE POINT AFTER ITS DWELL TIME EXPIRES THE DWELL TIME OF THE LAST POINT IS NOT PART OF THE TRANSITION TIME THEREFORE DIVIDE THE TOTAL TIME BY 19 POINTS NOT 20 ALSO YOU ONLY NEED TO DOWNLOAD 1 DWELL TIME IF THE MODULE RECEIVES ONLY 1 DWELL TIME IT ASSUMES YOU WANT THE SAME DWELL TIME FOR EVERY POINT IN THE LIST FOR I 1 TO 20 V step l Vstart Vstop Vstart 20 l CALCULATES VOLTAGE LIST POINTS NEXT I OUTPUT Slot0 RST CLS STATUS PRESET 1 RESET AND CLEAR MODULE OUTPUT Slot0 VOLT Vstart START RAMP AT Vstart OUTPUT Slot0 CURR 1 OUTPUT Slot0 OUTPUT ON OUTPUT Slot0 V
113. inary value Related Commands None TRG Meaning and Type Trigger Device Trigger Description This command generates a trigger to any subsystem that has BUS selected as its source for example TRIG SOUR BUS OUTP TTLT SOUR BUS The command has the same affect as the Group Execute Trigger GET command Command Syntax TRG Parameters None Query Syntax None Related Commands ABOR CURR TRIG INIT TRIG IMM VOLT TIUG 30 Language Dictionary TST Meaning and Type Test Device Test Description This query causes the power module to do a self test and report any errors see Selftest Error Messages in Chapter 3 of the power module User s Guide Query Syntax TST Returned Parameters lt NRI gt 0 Indicates power module passed self test Nonzero Indicates an error code Related Commands None WAI Meaning and Type Wait to Continue Device Status Description This command instructs the power module not to process any further commands until all pending operations are completed Pending operations are as defined under the OPC command WAI can be aborted only by sending the power module a GPIB DCL Device Clear command Command Syntax WAI Parameters None Query Syntax None Related Commands OPC Description of Subsystem Commands Figure 3 2 is a tree diagram of the subsystem commands Commands followed by a question mark take only the query form Except as noted in the syntax descriptions all ot
114. ing EO error ioeoL INTERFACE If strlen cr If Ff Turn on End of Line termination error handler error Enabling EOL error iooutputa SLOTO amp vstep 1 NUM PTS FK Download voltage points array starting error handler error Voltage List Array F with the element 1 not 0 sprintf cmd buff LIS T DWELL f dwell F Download 1 dwell time Use numberto error iooutputs SLOTO cmd buff strlen cmd string conversion to send the real error_handler error _ buff f number over the bus as part of the command string ul cmd LIST STEP AUTO F X Dwell paced List error iooutputs S LOTO cmd strlen cmd error handler error cmd cmd z INITIATE f Enable trigger to start List error iooutputs SLOTO cmd strlen cmd error_handler error cmd Before triggering the module determine if it is ready by checking for Waiting for Trigger bit 5 of the Operation Status Register You could eliminate this step by simply inserting a pause in the program However by checking the instrument status you can avoid timing problems Also any other operations that take time will give the module a chance to complete processing do STATUS OPERATION CONDITION error iooutputs S LOTO cmd strlen cmd error handler error cmd error ioenter S LOTO amp condition data FK You must convert float to integer error handler error Read ba
115. ing of a command header or keyword followed by a message terminator ABOR lt newline gt VOLT lt newline gt The message unit may include a parameter after the header The parameter usually is numeric but it can be a string VOLT 20 lt newline gt VOLT MAX lt newline gt Combining Message Units The following command message is briefly described here with details in subsequent paragraphs 10 Introduction To Programming Data Message Unit Headers Query Indicator VOLT LEV 8 0 PROT 8 8 CURR NL Header Separator Message Terminator Message Unit Separators Root Specifier FIG2 1 GAL Figure 2 1 Command Message Structure The basic parts of the above message are Message Component Example Headers VOLT LEV PROT CURR Header Separator The colon in VOLT LEV Data 8 0 8 8 Data Separator The space in VOLT 8 0 and PROT 8 8 Message Units VOLT LEV 8 0 PROT 8 8 CURR Message Unit Separator The semicolons in VOLT LEV 8 0 and PROT 8 8 Root Specifier The colon in PROT 8 8 CURR Query Indicator The question mark in CURR Message Terminator The lt NL gt newline indicator Terminators are not part of the SCPI syntax Parts of a SCPI Message Headers Headers are instructions recognized by the power module interface Headers which are sometimes known as keywords may be either in the long form or the short form Long Form The header is completely spelled out such as VOLTAGE STATUS and DE
116. ion that caused the OVP trip is removed The OVP always trips with zero delay and is unaffected by the OUTP PROT DEL command Command Syntax SOURce VOLTage PROTection LEVel lt NRf gt Parameters See Table 3 2 Default Suffix V RST Value MAX Examples VOLT PROT 2 5 VOLT PROT LEV MAX 48 Language Dictionary Query Syntax Returned Parameters Related Commands VOLT SENS SOUR SOURce VOLTage PROTection LEVel SOURce VOLTage PROTection LEVel MIN SOURce VOLTage PROTection LEVel MAX lt NR3 gt VOLT PROT returns presently programmed OVP level VOLT PROT MAX and VOLT PROT MIN return the maximum and minimum programmable OVP levels OUTP PROT CLE RST SAV RCL This command reads the state of the power module output connector remote sense switch The INTernal parameter corresponds to the LOCAL position of the switch See the power module User s Guide for more information about this switch VOLT SENS SOUR is an alias for the SCPI VOLT ALC SOUR command Query Syntax SOURce VOLTage SENSe SOURce Example VOLT SENS SOUR Returned Parameters EXTernal INTernal Related Commands VOLT ALC SOUR VOLT TRIG This command programs the pending triggered voltage level of the power module The pending triggered voltage level is a stored value that is transferred to the output terminals when a trigger occurs A pending triggered level is unaffected by subsequent VOLT LEV IMM commands and remains in effect until
117. is shown in the following table Bit Configuration of Operation Beg sters Bit Position 12 11 10 9 2 7 E e Bit Name STC NU CC NU NU ERG m NU m CAL Bit Weight 4096 2048 1024 512 128 16 4 1 CAL Interface is computing new calibration constants CC ue power T is in constant current m CV The power module is in constant voltage mode NU Not used STC The list step is complete WTG Interface is waiting for a trigger Note See Chapter 4 Status Reporting for more explanation of these registers STAT OPER This query returns the value of the Operation Event register The Event register is a read only register which holds latches all events that are passed by the Operation NTR and or PTR filter Reading the Operation Event register clears it Query Syntax STATus OPERation EVENt Parameters None Returned Parameters NRI Register Value Examples STAT OPER EVEN Related Commands CLS STAT OPER NTR STAT OPER PTR STAT OPER COND This command returns the value of the Operation Condition register That is a read only register which holds the real time unlatched operational status of the power module Query Syntax STATus OPERation CONDition Parameters None Examples STAT OPER COND Returned Parameters NRI Register value Related Commands None STAT OPER ENAB This command and its query set and read the value of the Operation Enable register This register is a mask
118. lanation of this register Query Syntax Parameters Returned Parameters Related Commands ESR None NRI Register binary value CLS ESE ESE OPC Language Dictionary 25 IDN Identification Query Meaning and Type Identification System Interface Description This query requests the power module to identify itself It returns a string composed of four fields separated by commas Query Syntax IDN Returned Parameters lt AARD gt Field Information Agilent Technologies Manufacturer 5 digit model number followed by a letter nnnnA nnnnn 10 character serial number or 0 R xx xx Revision levels of firmware Example Agilent Technologies 66101A 0 A 00 01 Related Commands None OPC Meaning and Type Operation Complete Device Status Description This command causes the interface to set the OPC bit bit 0 of the Standard Event Status register when the power module has completed all pending operations see ESE for the bit configuration of the Standard Event Status register Pending operations are complete when All commands sent before OPC have been executed This includes overlapped commands Most commands are sequential and are completed before the next command is executed Overlapped commands are executed in parallel with other commands Commands that affect output voltage current or state relays and trigger actions are overlapped with subsequent commands sent to the power module The OPC co
119. les Query Syntax Related Commands 34 Language Dictionary CALibrate VOLTage LEVel lt CRD gt MINimum IMA Ximum CAL VOLT LEV MIN CAL VOLT LEV MAX None CAL VOLT DATA CAL STAT CAL VOLT PROT This command can only be used in the calibration mode It calibrates the power module overvoltage protection OV circuit The power module output must be enabled and operating in the constant voltage CV mode The power module automatically performs the calibration and stores the new OV constant in nonvolatile memory CAL VOLT PROT is a sequential command that takes several seconds to complete Command Syntax CALibrate VOLTage PROTection Parameters None Example CAL VOLT PROT Query Syntax None Related Commands CAL STAT Current Subsystem This subsystem programs the output current of the power module CURR This command directly programs the immediate current level of the power module The immediate level is the current applied at the output terminals This command is always active even when the current subsystem is in the list mode see CURR MODE Command Syntax SOURce CURRent LEVel MMediate AMPLitude lt NRf gt Parameters See Table 3 2 Default Suffix A RST Value See Table 3 2 Examples CURR 500 MA CURR LEV 5 Query Syntax SOURce CURRent LEVel IMMediate AMPL itude SOURce CURRent LEVel MMediate AMPLitude MAX SOURce CURRent LEVel IMMediate AMPLitude MIN Returned Parameters lt NR3
120. loops By using dwell times the timing of each point is accurate and repeatable because the computer does not provide timing for the sequence When the output is disabled the active downprogrammers in the module output can quickly discharge the module s output capacitors and any capacitance in the DUT 86 Application Programs 4A At 12 Volts Current 600 mA 100 ms 500 ms Time Figure B5 1 Typical DUT Current vs Time typical DUT current programmed current limit Current Dwell time on last point is not important 700 O ms 100 ms Time 500 ms 12 V Computer trigger command Figure B5 2 Desired Current vs Time Application Programs 87 Implementation Details How The MPS Implements The Sequence The module is programmed to current List mode The module will execute a dwell paced current List The current limit List points are downloaded to the module The dwell times are downloaded to the module To begin powering the DUT the module is triggered by the computer This one trigger causes the current List to begin executing and the voltage to go to its programmed value The module steps through the current limit List The module continuously monitors its status If the modules goes into CC the overcurrent protection disables the output Module Set Up Set the current mode to List Download curren
121. m The List Subsystem commands allow you to program a sequence of voltage and or current values that will be applied to the power module output when it is the list mode VOLTage MODE LIST or CURRent MODE LIST Up to 20 voltage and current values with 20 associated time intervals dwells may be programmed By using lists you can program a complex sequence of power module outputs with minimal interaction between the controller and the power module Lists allow you to time output changes more precisely or to better synchronize them using triggers with asynchronous events Basic Steps of List Sequencing You can program the number of output levels or points in the list the time interval that each level is maintained the number of times that the list will be executed and how the levels change in response to triggers This is a synopsis of the list commands List Function Command Enable the voltage list function VOLT MODE LIST Enable the current list function CURR MODE LIST Specify the voltage output levels points LIST VOLT lt NRf gt Specify the current output levels points LIST CURR lt NRf gt Specify the time duration of each output level LIST DWEL lt NRf gt Specify the times the list is repeated LIST COUN lt NRf gt Select the list response to a trigger LIST STEP AUTOIONCE Programming the List Output Levels 1 Enable the specific output to be controlled by the list For example VOLT MODE LIST CURR MODE LIST 2 Program
122. mmand provides notification that all overlapped commands have been completed Any change in the output level caused by previous commands has been completed completion of settling time relay bounce etc All triggered actions are completed OPC does not prevent processing of subsequent commands but Bit 0 will not be set until all pending operations are completed Command Syntax OPC Parameters None Related Commands OPC WAI OPC Meaning and Type Operation Complete Device Status Description This query causes the interface to place an ASCII 1 in the Output Queue when all pending operations are completed Pending operations are as defined for the OPC command Unlike OPC OPC prevents processing of all subsequent commands OPC is intended to be used at the end of a command line so that the application program can then monitor the bus for data until it receives the 1 from the power module Output Queue 26 Language Dictionary Do not follow OPC with TRG or GPIB bus triggers Such triggers sent after OPC will be prevented from executing and will prevent the power module from accepting further commands If this occurs the only programmable way to restore operation is by sending the power module a GPIB DCL Device Clear command Query Syntax OPC Returned Parameters NRI ASCII is placed in the Output Queue when the power module has completed operations Related Commands OPC TRIG WAI OPT Identific
123. more properly formatted SCPI commands sent from the controller to the power module The message which may be sent at any time requests the power module to perform some action A response message consists of data in a specific SCPI format sent from the power module to the controller The power module sends the message only when commanded by a special program message called a query Types of SCPI Commands SCPI has two types of commands common and subsystem Common commands generally are not related to specific operation but to controlling overall power module functions such as reset status and synchronization All common commands consist of a three letter mnemonic preceded by an asterisk RST SRE8 Subsystem commands perform specific power module functions They are organized into an inverted tree structure with the root at the top see Figure 3 2 Some are single commands while others are grouped within specific subsystems Note If you have the optional Agilent 66001A MPS Keyboard you may want to use it as a quick introduction to message structure See Appendix A Structure of a SCPI Message SCPI messages consist of one or more message units ending in a message terminator The terminator is not part of the syntax but implicit in the way your programming language indicates the end of a line such as a newline or end of line character The Message Unit The simplest SCPI command is a single message unit consist
124. mputer does not provide timing for the sequence When the output is disabled the active downprogrammers in the module output can quickly discharge the module s output capacitors and any capacitance in the DUT Implementation Details How The MPS Implements The Sequence The module is programmed to List mode The module will execute a dwell paced List The 3 voltage points are downloaded to the module The 3 dwell times are downloaded to the module To begin the cycling the module is triggered by the computer The module continuously generates the voltage waveform The module continuously monitors its status If the module goes into CC the overcurrent protection disables the output The module generates an SRQ when the overcurrent protection occurs Module set up Set voltage mode to List Download voltage List Download dwell times Set Lists to dwell paced Set Lists to infinitely repeat Enable status monitoring of overcurrent condition Enable overcurrent protection Enable SRQ generation on overcurrent protection occurrence Application Programs 83 Variations On This Implementation 1 The module could be set to begin generating the waveform in response to an external or backplane TTL Trigger 2 The module could be set to generate external triggers for each point in the List This trigger could be routed to other instruments to synchronize external measurements to the change in voltage see application 7 Using
125. n The module will also be set up to generate an SRQ and stop the voltage cycling of the hybrid should fail If the hybrid fails by shorting the module will go into CC This change in status will cause the module to protect the DUT by disabling the output which will stop the test and generate an SRQ Open circuit failures will not be detected Since failures of this type are less likely to have destructive consequences detection is not required 82 Application Programs MPS Features Used 20 point voltage List Repetitive Lists Dwell time Dwell paced Lists Generate an SRQ on a change in internal status Disable the output on a change in internal status Stop the List on a change in internal status Trigger on a GPIB trigger command Overcurrent protection Active downprogramming Advantages Benefits Of The MPS Solution By using Lists the module changes its output voltage automatically so that the computer is not devoted to reprogramming the output voltage The output can change faster when dwell paced than when the computer must explicitly reprogram each change Overcurrent protection can disable the output before the DUT is damaged By letting each module monitor its status the CC condition will be responded to faster than if the computer was responsible for stopping the test The sequence is simpler to program no timing loops By using dwell times the timing of each point is accurate and repeatable because the co
126. n at hardware speeds without computer intervention When the test is complete either device can signal the computer to get the data from the DMM For the purpose of this example the module will generate an SRQ when the last List point has been executed This is indicated by the OPC Operation Complete bit in the status register Another detail that needs attention is timing The DUT may require some settling time before the DMM is told to take a reading The module s dwell time can be used to do this The STC Step Complete status signal indicates when the point has been executed and its dwell time has expired The dwell time is programmed to be the engine sensor s settling time The external trigger is generated when STC is asserted Thus the DMM will not be triggered until the dwell time has expired and the sensor s output has settled This type of self paced test execution is useful in two situations When the test must execute very fast there is no time for the computer to be involved in each iteration of the test loop Therefore the test must execute without computer intervention The second situation is when the test is very long For example if the measurement instrument took 1 minute to make each measurement the test would take 13 minutes to execute The computer is not used efficiently if it is idle while waiting for each measurement loop so it would be best to have the computer executing another task Without self pacing you would need
127. n circuit has tripped 4 OT The power module has an 5 ESB Event Status summary bit overtemperature condition 9 RI The power module remote inhibit state 6 MSS Master Status summary bit is active RQS Request Service bit 10 UNR The power module output is T OPER Operation status summary bit unregulated Questionable Status Group Register Functions The Questionable Status registers record signals that indicate abnormal operation of the power module As shown in Figure 4 1 the group consists of the same type of registers as the Status Operation group The outputs of the Questionable Status group are logically ORed into the QUES tionable summary bit 3 of the Status Byte register Register Commands Programming for this group is derived from the STAT QUES commands described in Chapter 3 Language Dictionary and summarized in Table 4 3 Table 4 3 Status Questionable Commands Register Command Query Cleared By Condition None STAT QUES COND Cannot be cleared PTR Filter STAT QUES PTR lt NRf gt STAT QUES PTR Programming 0 NTR Filter STAT QUES NTR lt NRf gt STAT QUES NTR Programming 0 or STAT PRES Event None STAT QUES EVEN Reading or CLS Enable STAT QUES ENAB lt NRf gt STAT QUES ENAB Programming 0 52 Status Reporting ov oc N U NU REQUEST GENERATION STANDARD EVENT STATUS OPC o 1 8 SES E QYE 4 4 prr 5 32
128. nd Completion SCPI commands sent to the power module are processed either sequentially or in parallel Sequential commands finish execution before a subsequent command begins A parallel command can begin execution while a preexisting command is still executing overlapping commands Commands that affect list and trigger actions are among the parallel commands There WAI OPC and OPC common commands provide different ways of indicating when all transmitted commands including any parallel ones have completed their operations The syntax and parameters for these commands are described in Chapter 3 Language Dictionary Some practical considerations for using these commands are as follows WAI This prevents the power module from processing subsequent commands until all pending operations are completed If something prevents completion of an existing operation WAI can place the module and the controller in a hang up condition OPC This places a in the Output Queue when all pending operations have completed Because it requires your program to read the returned value from the queue before executing the next program statement OPC could prevent subsequent commands from being executed OPC This sets the OPC status bit when all pending operations have completed Since your program can read this status bit on an interrupt basis OPC allows subsequent commands to be executed The trigger subsystem must be in the Idle state in order for t
129. ns float vstart 2 0 FK Start voltage for the ramp float vstop 10 0 FK Stop voltage for the ramp float vstepINUM PTS FK Used to hold voltage List points for the ramp float ramptime 0 5 Transition time in seconds for the ramp float dwell f time in seconds for each ramp step dwell ramptime 19 0 Since the output stays at the last voltage point after its dwell time expires the dwelt time of the last point is not part of the transition time Therefore divide the total time by 19 points not 20 You want the same dwell time for every point in the List so only download 1 dwell time for i 1 lt i F Calculate the voltage List points vstep i vstart vstop vstart NUM PTS i error ioreset INTER FACE F error handler error Resetting the interface error iotimeout INTERFACE double 2 0 error handler error Setting the timeout Note regarding GPIB read write terminations To get the interface to its defaults f Enables timeout of 2 seconds The default of the interface card is that EOI is enabled and the read writes terminate on carriage return line feed The module terminates on either EOI or Line feed so the default settings of the card are sufficient cmd RSTACLS STATUS PRESET F error iooutputs S LOTO cmd strlen cmd error handler error cmd sprintf cmd buff VOLT f vstart error iooutputs SLO
130. nt Enable and Service Request Enable registers are saved in nonvolatile memory and recalled at power on This allows a PON event to generate SRQ at power on Programming PSC to 1 prevents these registers from being saved and they are cleared at power on This prevents a PON event from generating SRQ at power on Examples Note These examples are generic SCPI commands See Chapter 2 Programming Introduction for information about encoding the commands as language strings Servicing an Operation Status Mode Event This example assumes you want a service request generated whenever the power module switches to the CC constant current mode From Figure 4 1 note that the required path is for a condition at bit 10 CC of the Operation Status register to set bit 6 RQS of the Status Byte register The required register programming is as follows Status Reporting 55 Table 4 5 Generating RQS from the CC Event Register Command Comment latched into the Status Event register Operation PTR STAT OPER PTR 1024 STAT OPER ENAB 1024 Operation Enable Allows the latched CC event to be summed into the OPER Allows a positive transition at the CC input bit 10 to be summary bit SRE 128 Service Request Enable generate RQS Enables the OPER summary bit from the Status Byte register to STAT OPER EVEN Operation Condition When you service the request read the event regi
131. of output voltages LIST VOLT and currents LIST CURR A count command LIST COUN determines how many times the power module sequences through a list before that list is completed A dwell command LIST DWEL specifies the time interval that each value point of a list is to remain in effect A step command LIST STEP determines if a trigger causes a list to advance only to its next point or to sequence through all of its points Each list can have from 1 to 20 points Normally voltage current and dwell lists must have the same number of points or an error is generated when the first list point is triggered The exception is a list consisting of only one point Such a list is treated as if it had the same number of points as the other lists with all the points having the same value as the one specified point Note All list subsystem commands as well as CURR MODE LIST and VOLT MODE LIST are implied ABORt commands LIST COUN This command sets the number of times that the list is executed before it is completed The command accepts parameters in the range 1 through 9 9E37 but any number greater than 65534 is interpreted as INFinity Use INF if you wish to execute a list indefinitely Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands LIST CURR SOURce LIST COUNt lt NRf gt 1 to 9 9E37 INFinity 1 LIST COUN3 LIST COUN INF SOURce LIST COUNt lt NR3 gt CUR
132. ommands RST DISPlay Command This command turns the power module optional front panel voltage and current displays on and off It does not affect the annunciators Command Syntax DISPlay WINDow STAT bool Parameters 0111 OFF ON RST Value ON Examples 5 5 1 DISP STAT OFF Query Syntax DISPlay WINDow STAT Returned Parameters 011 Related Commands 5 RCL INITiate Command This command enables the trigger subsystem When a trigger is enabled an event on the selected trigger source causes the specified triggering action to occur If a trigger circuit is not enabled all trigger commands are ignored If INIT CONT is OFF then INIT enables the trigger subsystem only for a single trigger action The subsystem must be enabled prior to each subsequent trigger action If INIT CONT is ON then the trigger system is continuously enabled and INIT is redundant 36 Language Dictionary Command Syntax INITiate IMMediate INITiate CONTinuous bool Parameters INIT IMM None For INIT CONT 01 1I OFFI ON RST Value OFF Examples INIT 1 INIT CONT ON Query Syntax For INIT IMM None For INIT CONT INITiate CONTinuous Returned Parameters 011 Related Commands ABOR CURR TRIG TRIG VOLT TRIG List Subsystem This subsystem controls the generation of parameter lists that sequence the power module output through values of voltage and current Two subsystem commands specify lists
133. on circuit has tripped RI Remote inhibit is active UNR Power supply output is See Chapter 4 Status Reporting for more explanation of these registers STAT QUES This command returns the value of the Questionable Event register The Event register is a read only register which holds latches all events that are passed by the Questionable NTR and or PTR filter Reading the Questionable Event register clears it Query Syntax Parameters Returned Parameters Examples Related Commands STAT QUES COND STATus QUEStionable EVENt None NRI Register Value STAT QUES EVEN CLS STAT QUES NTR STAT QUES PTR This query returns the value of the Questionable Condition register That is a read only register which holds the real time unlatched questionable status of the power module Query Syntax Example Returned Parameters Related Commands STAT QUES ENAB STATus QUEStionable CONDition STAT QUES COND lt gt Register value None This command sets or reads the value of the Questionable Enable register This register is a mask for enabling specific bits from the Questionable Event register to set the questionable summary QUES bit of the Status Byte register This bit bit 3 is the logical OR of all the Questionable Event register bits that are enabled by the Questionable Status Enable register Command Syntax Parameters Suffix Default Value Example Query Syntax Returned Parameters Related
134. ortion of IEEE 488 2 The same SCPI commands and parameters control the same functions in different classes of instruments For example you would use the same DISPlay command to control the power module display state and the display state of a SCPI compatible multimeter Conventions The following conventions are used throughout this chapter Angle brackets lt gt Items within angle brackets are parameter abbreviations For example lt NR1 gt indicates a specific form of numerical data Vertical bar Vertical bars separate one of two or more alternative parameters For example OIOFF indicates that entering either 0 or OFF performs the same function Square Brackets Items within square brackets are optional The representation SOURce LIST means that SOURce may be omitted Braces Braces indicate parameters that may be repeated zero or more times It is used especially for showing arrays The notation lt A gt lt B gt shows that parameter A must be entered while parameter B may be omitted or may be entered one or more times Boldface font Boldface font is used to emphasize syntax in command definitions TRIGger DELay NRf shows a command definition Computer font Computer font is used to show program lines in text TRIGger DELay 5 shows a program line Introduction To Programming 9 Types of SCPI Messages There are two types of SCPI messages program and response A program message consists of one or
135. pending operations F105 3 Figure 5 3 Timing diagrams of LIST STEP Operation Synchronizing Power Module Output Changes 63 DFI Discrete Fault Indicator Subsystem Whenever a fault is detected in the power module it is capable of generating a low true TTL signal at the mainframe FLT jack for communication with external devices see INH FLT Characteristics in Chapter 1 of the Agilent 66000A Installation Guide for the electrical parameters The source for the DFI signal can be any of the parameters of the OUTPut DFI LINK command see Table 3 1 The SUM link parameter allows any combination of Questionable Operation or Event status bits to generate the DFI signal The GPIB RST command sets the link parameter to SUMS RI Remote Inhibit Subsystem Each power module is connected to the mainframe INH jack via a function selector switch See Chapter 2 of the Operating Guide for details concerning this switch When the switch is set to enable the RI function a low true TTL signal at the INH input will shut down the power module This generates an RI status bit at the Questionable Status register see Chapter 4 Status Reporting By programming the status subsystem you may use RI to generate a service request SRQ to the controller and or to create a DFI output at the mainframe FLT jack By using RI DFI in this way you can chain the power modules to create a serial shutdown in response to the INH input SCPI Comma
136. plete output signal when it s done The module receives the DMM output signal as an external trigger in Also upon receipt of the trigger in the module outputs its next List point The process repeats for each List point After the last List point has executed the module generates SRQ telling the computer the test has completed MPS Set Up Set the voltage mode to List Download the voltage List Download the dwell time List Set the List to be trigger paced Set the trigger source to external trigger Note The computer trigger command TRIGGER IMMEDIATE is always active even if the external trigger is the selected source Set the module to generate a backplane TTL Trigger on STC This backplane TTL Trigger drives external trigger out Set the module to generate SRQ on OPC Variations On This Implementation 1 A current List could also have been executed by the module so that for each voltage point a corresponding current limit could be programmed 2 Overcurrent protection could be enabled to protect a faulty engine sensor 3 If the DMM does not have an internal buffer the computer could take a reading on each iteration of the test loop see previous application 96 Application Programs Handshake Connections GPIB Trigger to start Backplane Ext Trigger Backplane MPS TTL Trigger OMM Mainframe Out d internal data buffer DUT Test Point Measurement
137. programs Chapter 3 Dictionary of SCPI commands Table of module programming parameters Chapter 4 Description of the status registers Chapter 5 Description of synchronizing outputs with triggers and lists Chapter 6 Error messages Appendix A SCPI conformance information Appendix B Application programs that illustrate features of the power module Note Instructions for the Agilent 60001A MPS Keyboard are in the User s Guide supplied with each module Documentation Summary The following related documents shipped with the system have information helpful to programming the power module Mainframe User s Guide Information on the GPIB address switch trigger connections fault FLT and remote inhibit INH connections e Module User s Guide Includes specifications and supplemental characteristics use of the module configuration switch device related error messages calibration procedures and use of the MPS keyboard External References SCPI References The following documents will assist you with programming in SCPI Beginner s Guide to SCPI Part No H2325 90001 Highly recommended for anyone who has not had previous experience programming with SCPI Tutorial Description of the GPIB Part No 5952 0156 Highly recommended for those not familiar with the IEEE 488 1 and 488 2 standards To obtain a copy of the above documents contact your local Agilent Technologies Sales and Support Office GPIB References Th
138. propriate data format Each command library call returns an int If the value is zero no error has occurred Error handling is accomplished by checking the return value See the command library documentation for interpretation of this error value Using the National Instruments GPIB Interface The module is identified as a device in two ways First the GPIB COM driver is modified to include the module Use the mainframe address as the primary bus address Use the slot address as the secondary address The driver requires that secondary address which is for slot 0 be entered as 96 secondary address 1 be entered as 97 etc It is recommended that you disable the auto serial poll in the GPIB COM driver The module expects each command to be terminated by either a line feed character 10 and or EOI Configure the GPIB COM driver to terminate all reads and writes with EOI The GPIB driver does all communication via strings To send numeric data number to string conversion must be performed before the ibwrt To read numeric data string to number conversion must be performed after each ibrd Error handling is accomplished by checking the variable IBSTA If bit 15 is set an error has occurred See the GPIB interface documentation for the interpretation of this error variable 18 Introduction To Programming Sending Commands to and Receiving Data from the Module Sending the Command VOLT 5 2100 OUTPUT 70501 VOLT 5 whe
139. r s function calls work together on top of the VISA I O library a single instrument driver can be used with multiple application environments Supported Applications Agilent VEE Microsoft Visual BASIC Microsoft Visual C C Borland C C National Instruments LabVIEW National Instruments LabWindows CVI System Requirements The VXIplug amp play instrument driver complies with the following Microsoft Windows 95 Microsoft Windows NT 4 0 HP VISA revision F 01 02 National Instruments VISA 1 1 Downloading and Installing the Driver NOTE Before installing the VXIplug amp play instrument driver make sure that you have one of the supported applications installed and running on your computer 1 Access Agilent Technologies Web site at http www agilent com find drivers Select the instrument for which you need the driver Click on the driver either Windows 95 or Windows NT and download the executable file to your PC Pe ege Locate the file that you downloaded from the Web From the Start menu select Run path Vagxxxx exe where path is the directory path where the file is located and agxxxx is the instrument driver that you downloaded 5 Follow the directions on the screen to install the software The default installation selections will work in most cases The readme txt file contains product updates or corrections that are not documented in the on line help If you decide to install this file use any text editor
140. rating system level This makes it unnecessary to have the header files required in front of DOS applications programs Also you do not have to be concerned about controller hangups as long as your program includes a timeout statement Because the power module can be programmed to generate SRQ on errors your program can use an SRQ service routine for decoding detected errors The detectable errors are listed in Chapter 5 Error Messages TRANSLATION AMONG LANGUAGES This section explains how to translate between Agilent BASIC and several other popular programming environments For explicit information on initializing interface cards or syntax of language see the documentation that accompanies your GPIB interface product General Setup Information for GWBASIC Using the Agilent 82335A 82990A 61062B GPIB Command Library When CALLs are made to the GPIB Command Library all parameters are passed as variables The address of a module is a real number determined in the same manner as in Agilent BASIC For example the address 70501 means 7 is the select code of the GPIB interface 05 is the GPIB address of the mainframe 01 is the slot number secondary address of the module The module expects each command to be terminated by line feed character 10 and or EOI The default configuration of the GPIB Command Library is carriage return line feed for end of line termination and EOI at the end of a line Therefore the defaults are correct for
141. re 70501 means 7 is the select code of the GPIB interface 05 is the 2110 GPIB address of the mainframe 01 is the slot number secondary address 2120 of the module 2100 MODULE ADDRESS 70501 2110 COMMANDS VOLT 5 2120 L LENGTH COMMANDS 2130 CALL IOOUTPUTS MODULE ADDRESS COMMANDS L 2140 amp lt gt 0 THEN ERROR PCIB BASERR ERROR TRAP GWBASIC National Instruments GPIB Interface k k k k k k k 2100 COMMANDS VOLT 5 2110 CALL IBWRT MODULE ADDRESS COMMAND 2120 IFIBSTA amp 0 GOTO 5000 TRAP ERROR WITH ERROR HANDLER 2130 AT LINE 5000 Sending the Command VOLT 5 in BASIC Microsoft C Agilent 82335A 82990A 61062B HPIB Command Library Assumes that you have an error handler routine called error_handler that accepts a float The error handler in then passed the float that is returned from each call to the library include amp lt stdio h gt include amp lt chpib h gt include amp lt cfunc h gt define module address 70501L VOLT 5 error iooutputs MODULE ADDRESS cmd strlen cmd char cmd error handler error k k k k k k k Microsoft C National Instruments GPIB Interface Assumes that you have an error handler routine called error handler Th
142. rned Parameters SOURce CURRent PROTection STATe bool 01 11 OFFI ON OFF CURR PROT STAT 0 CURR PROT STAT OFF SOURce CURRent PROTection STATe 011 Related Commands OUTP PROT CLE OUTP PROT DEL RCL SAV CURR TRIG This command programs the pending triggered current level of the power module The pending triggered current level is a stored value that is transferred to the output terminals when a trigger occurs A pending triggered level is unaffected by subsequent CURR commands and remains in effect until the trigger subsystem receives a trigger or an ABORt command is given If there is no pending triggered level then the query form returns the IMMediate current level In order for CURR TRIG to be executed the trigger subsystem must be initiated see INITiate Command Syntax SOURce CURRent LEVel TRIGgered AMPL itude lt NRf gt Parameters See Table 3 2 Default Suffix A RST Value See Table 3 2 Examples CURR TRIG 1200 MA CURR LEV TRIG 1 2 Query Syntax SOURce CURRent LEVel TRIGgered AMPL SOURce CURRent LEVel TRIGgered AMPLitude MAXimum SOURce CURRent LEVel TRIGgered AMPLitude MIN lt NR3 gt CURR TRIG returns the presently programmed triggered level If no triggered level is programmed the CURR level is returned CURR TRIG MAX and CURR TRIG MIN return the maximum and minimum programmable triggered current levels ABOR CURR IMM CURR MODE INIT Returned Parameters Related C
143. roup are logically ORed into the OPER ation summary bit 7 of the Status Byte register Register Commands Commands that access this group are derived from the STAT OPER commands described in Chapter 3 Language Dictionary and summarized in Table 4 1 Table 4 1 Status Operation Commands Register Command Query Cleared By Condition STAT OPER COND Cannot be cleared PTR Filter STAT OPER PTR lt NRf gt STAT OPER PTR Programming 0 or STAT PRES NTR Filter STAT OPER NTR lt NRf gt STAT OPER NTR Programming 0 Event None STAT OPER EVEN Reading or CLS Enable STAT OPER ENAB lt NRf gt STAT OPER ENAB Programming 0 Status Reporting 51 Table 4 2 Bit Configurations of Status Registers Bit Signal Meaning Bit Signal Meaning Operation Status Group Standard Event Status Group 0 CAL The interface is computing new 0 OPC Operation complete calibration constants 5 WTG The interface is waiting for a trigger 2 QYE Query error 8 CV The power module is in constant 3 DDE Device dependent error voltage mode 10 CC The power module is in constant 4 EXE Execution error current mode 12 DWE The list step is active dwelling 5 CME Command error 7 PON Power on Questionable Status Group Status Byte and Service Request Enable Registers 0 OV The power module overvoltage 3 QUES Questionable status summary bit protection circuit has tripped 1 OC The power module overcurrent 4 MAV Message Available summary bit protectio
144. se signals which are applied to all power modules in the mainframe see TrigIn TrigOut Characteristics in Chapter 1 of Agilent 66000A Installation Guide for electrical parameters Trigger In and Trigger Out are electrically isolated at each power module from the mainframe chassis reference ground Trigger In Trigger In is a TTL level input that can be selected as a trigger source for each module Modules recognize a Trigger In signal on its falling edge Trigger In is selected as a trigger source with the EXTernal parameter For example TRIGger SOURce EXT OUTPut TTLT SOURce EXT Trigger Out The Trigger Out signal is a 20 microsecond negative true TTL pulse This pulse can be driven by each power module by programming the OUTPut TTLTrg commands Each module can also select Trigger Out as a trigger source by programming the SCPI TRIGger SOURce TTLT command see Chapter 3 Language Dictionary for details of these commands To select the Trigger In connector as a trigger source use TRIG SOUR EXT To apply a trigger to the Trigger Out connector use OUTP TTLT ON You must also select the source OUTP TTLT SOUR OUTP TTLT SOUR TRIGGER OUT LINK BUS poo EXT TRIG SOUR HOLD LL TT gt 1 MAINFRAME TRIGGERED EVENT TRIGGER IN See Chapter 3 Language Dictionary FI65 2 GAL Figure 5 2 TTLT Trigger Model 60 Synchronizing Power Module Output Changes List Subsyste
145. slot 2 The module is connected to supply 5 V to the DUT The initial voltage setting is 5 V The module monitors its status The module will generate a backplane TTL Trigger on CV to CC crossover The module listens for backplane TTL Trigger Upon receipt of the trigger the module immediately goes to Variations On This Implementation 1 The modules could be set to generate SRQ when the last module reaches 0 V This could notify the computer that power has been removed from the DUT 2 The modules could be set to generate a DFI Discrete Fault Indicator signal on the MPS rear panel on a change in status This signal could be used to shut down other power modules to flash an alarm light or to sound a buzzer This could also be routed to other instruments to signal them to stop making measurements 3 To get all three modules to remove power from the DUT at the same time simply eliminate the trigger delay on the 15 V modules 4 To provide a delay between the removal of the three bias voltages you can program a different trigger delay into each module Application Programs 75 76 Backplane TTL Trigger MPS Mainframe DUT Figure B2 1 Block Diagram of Application 2 D Trigger response lt 3 ms CV to CC cc Status Change in Any Module MPS Mainframe Backplane i TTL Trigger i Module DM Slot 2 7 Module Slot O Module Siot 1 15ms
146. ster to determine that bit 10 CC is set and to clear the register for the next event bits of the PTR registers bits are set to 1 at power on Adding More Operation Events To add CV constant voltage and DWE dwelling events to this example it is only necessary to add the decimal values for bit 8 value 64 and bit 12 value 4096 to the programming commands of the Operation Status group The commands to do this are STAT OPER PTR 5376 ENAB 5376 It is not necessary to change any other registers since the programming for the operation summary bit OPER path has already been done Servicing Questionable Status Events To add OC overcurrent and OT overtemperature events to this example program Questionable Status group bits 1 and 4 STAT QUES PTR 18 ENAB 18 Next you must program the Service Request Enable register to recognize both the questionable QUES and the operational OPER summary bits SRE 136 Now when there is a service request read back both the operational and the questionable event registers STAT OPER EVEN QUES EVEN Monitoring Both Phases of a Status Transition You can monitor a status signal for both its positive and negative transitions For example to generate RQS when the power module either enters the CC constant current condition or leaves that condition program the Operational Status PTR NTR filter as follows STAT OPER PTR 1024 NTR 1024 STAT OPER ENAB 1024 SRE 128
147. t Ree ROR e RU bim Id eai 41 45 52 56 Output queues ere ote tr Eb tt poA p TUE 27 54 overcurrent protection see OCP overlapped commands i ete pae dice eit ete ded ede thas eee dede deed een 26 63 overvoltage protection see OVP ineo eheu ROUGH ORC P UI RUP Un OHOHI alee EN 45 50 52 P parallel commands see commands overlapped hr oe 23 24 31 50 passcode calibration see calibration password pending operations oe hes RERO eee EUER 27 31 Inani TS 25 52 55 power on status see RST state primary address see GPIB address prosranimessaBes orbe Mele rM rt Mu umen E DE 10 programming voltage e eoe nep DIR e ch rr ete grt deer eite epa 77 78 lo 25 27 54 Q UCT DM oie e n ELLE n M M f Mr 12 23 QUES bit EA ot pepe eU DOR OU Rhe ipte 30 45 50 52 ODE DA ue 23 92 cea te Rete teo a Ui Ot I etes 55 recalled parametets sspe SIEMPRE Omer 28 reference RRRRRRRRRRRRRRRRRRRRRRRRRRRRMMMMMMMEMMMMMMMEMMEEEMEEEEEEEMEEEEMEEEEEMMMMMMMMM 7 remote inhibit see RI TEMOLE SENSE SWITCH
148. t OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK OPER Operation summary bit OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK QUES Questionable summary bit OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK MAV Message available summary bit OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK OFF No linked event condition OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK ROS Request service summary bit OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK RTG Received a trigger bit OUTP TTLT LINK TRIG STAR LINK STC List step completed pulse OUTP TTLT LINK TRIG STAR LINK STS List step started pulse OUTP TTLT LINK TRIG STAR LINK SUM3 OPER or QUES or ESB bit OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK TDC Trigger delay complete pulse OUTP TTLT LINK TRIGESTARELINK Parameter Output Programming Range maximum programmable values Table 3 2 Power Module Programming Parameters Agilent Model 66103A 66105A 66106A Voltage 204 75 V Current 0 768 A OV Protection Average Resolution 220 0 V Voltage 60 0 mV Current 0 23 mA OV Protection 1 25 V RST State Values desc gp Voltage 0 Current 20 mA 12 mA Protection 220 0 V These also are the power on reset values when the factory default parameters are left in effect see Chapter 2 Installation in the power module User s Guide Nonvolatile
149. t List Download the dwell times Set the List to be dwell paced Enable overcurrent protection The initial voltage setting is The module listens for the computer to send a trigger command Upon receipt of the trigger command the module goes to 12 V Also upon receipt of the trigger command the module begins executing its current limit List Variations On This Implementation 1 The module could be set to begin applying power in response to an external or backplane TTL Trigger 2 Multiple modules could be programmed to cycle together in response to the computer trigger command Each module could have unique current limits voltage settings and dwell times 3 The module could be set to generate an SRQ if the overcurrent protection disables the output 4 The module could be set to generate an external or backplane TTL Trigger if the overcurrent protection disables the output 5 The in rush current can be controlled using the current limit settings of the current List Instead of setting the current limit slightly above 4 A it could be set at a much lower value This would limit the in rush current to the value in the List It would take longer to charge the capacitors on the assembly but the inrush condition would be controlled In this variation the overcurrent protection could not be used because you want the module to be in CC 88 Application Programs 10 20 30 40 50 60 10 80 90 100 110 120 130 14
150. t is repeated until the count has been satisfied see Figure 5 1 B Trigger Paced Lists If you need the output to closely follow asynchronous events then a trigger paced list is more appropriate Program LIST STEP to ONCE see Figure 5 3 B Now expiration of a dwell interval returns the trigger subsystem to the Initiated state The subsystem then waits for a trigger to start the next dwell interval During this time the power module output remains at the level set by the last executed point in the list Note If the subsystem is not in the dwelling state a TRIGger IMMediate command will sequence the next point in the list 62 Synchronizing Power Module Output Changes 0 01 seconds COMMAND Trig initiated _ 7 INIT IMM wTG _ NEM Trigger Event RTG TDC STS TRIG DEL 02 DWELL STC OUTPUT VOLTAGE LIST DWEL 05 15 03 LIST VOLT 5 10 0 NOTES 1 Trigger delay 3 Returns true only if there 2 Dwell time LIST STEP AUTO are no other pending operations 0 01 seconds COMMAND Trig initiated E Doi TOC E E INIT IMM STS DWELL STC OPC 9 TRIG DEL 02 LIST DWEL 05 15 03 OUTPUT VOLTAGE So LIST VOLT 5 10 0 NOTES 1 Trigger delay 3 Walting for trigger event 2 Dwell time B LIST STEP ONCE 4 Returns true only if there are no other
151. t ramp up shortest transition time that can be generated you must consider the minimum dwell time specification 10 ms and the maximum risetime of specification the power module 20 ms If you program 10 ms dwell times the power module will not be able to reach its output voltage before the next voltage point is output see Figure B3 2 MPS Features Used 20 point voltage List Dwell time Dwell paced Lists Advantages Benefits Of The MPS Solution By using Lists the module changes its output voltage automatically so that the computer is not devoted to reprogramming the output voltage The outputs can change faster when dwell paced than when the computer must explicitly reprogram each change The sequence is simpler to program no timing loops By using dwell times the timing of each point is accurate and repeatable The computer does not provide timing for the sequence For negative going ramps the active downprogrammers in the module output can quickly discharge the module s output capacitors and any capacitance in the DUT when negative going ramps are required Implementation Details How the MPS Implements The Sequence The module is programmed to List mode The module will execute a dwell paced List The 20 voltage points are downloaded to the module The 20 dwell times are downloaded to the module When the transition must occur the module is triggered by the computer The module output ramps under its own con
152. ta Form Talking Formats NRI Digits with an implied decimal point assumed at the right of the least significant digit Examples 273 0273 NR2 Digits with an explicit decimal point Example 273 0273 NR3 Digits with an explicit decimal point and an exponent Example 2 73E 2 273 0E 2 Listening Formats lt NRf gt Extended format that includes lt gt lt NR2 gt and lt NR3 gt Examples 273 273 2 73E2 lt NRf gt Expanded decimal format that includes lt NRf gt and MIN MAX Examples 273 273 2 73E2 MAX MIN and MAX are the minimum and maximum limit values that are implicit in the range specification for the parameter Table 2 2 Suffixes and Multipliers Class _ Suffix Unit _Unit with Multiplier Current A Ampere MA milliampere Amplitude V Volt MV millivolt Time _5 second 5 millisecond Common Multipliers 1E3 K kilo 1E 3 M milli _1 6 U micro Boolean Data Either form 1 0 or ON OFF may be sent with commands Queries always return 1 or 0 OUTPut OFF CURRent PROTection 1 String Data Strings are used for both program listening and response talking data String content is limited to the characters required for the link command parameters see Chapter 3 Language Dictionary Note The IEEE 488 2 format for a string parameter requires that the string be enclosed within either single C or double quotes Be certain that your program statements compl
153. tax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands TRIG SOUR TRIGger STARt LINK lt CRD gt See Table 3 1 OFF TRIG LINK CC TRIG LINK OPER TRIGger STARt LINK lt CRD gt See Table 3 1 ABOR INIT TRIG IMM TRIG SOUR This command selects the power module input trigger source as follows BUS TRG or GET Group Execute Trigger EXT Mainframe backplane Trigger In bus HOLD LINK TTLT Mainframe Trigger Out bus Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands No trigger source except TRIG IMM Internal power module event as specified by TRIG LINK TRIGger STARt SOURce lt CRD gt BUS EXT HOLD LINK TTLT BUS TRIG SOUR BUS TRIG SOUR LINK TRIGger STARt SOURce BUS EXT HOLD TTLT ABOR CURR TRIG INIT OUTP TTLT VOLT TRIG Language Dictionary 47 Voltage Subsystem This subsystem programs the output voltage of the power module VOLT This command directly programs the immediate voltage level of the power module The immediate level is the voltage applied at the output terminals This command is always active even when the voltage subsystem is in the list mode see VOLT MODE Command Syntax SOURce VOLTage LEVel 1MMediate AMPL itude lt NRf gt Parameters Table 3 2 Default Suffix V RST Value Table 3 2 Examples VOLT 2500 MV VOLT LEV 2 5 Query Syntax SOURce VOLTage LE
154. the backplane TTL Trigger and immediately goes to its next List point The third module receives the backplane TTL Trigger immediately goes to its next List point The computer gets a measurement from the measurement instrument 90 Application Programs MPS Set Up Module in slot 0 The module is connected to 5 V on the DUT The initial voltage setting is Set the voltage mode to List Download the voltage List Set the List to be trigger paced The module listens for the computer to send a trigger command Upon receipt of the trigger command the module outputs its next List point Also upon receipt of the trigger command the module generates a backplane TTL Trigger Module in slot 1 The module is connected to 12 V on the DUT The initial voltage setting is Set the voltage mode to List Download the voltage List Set the List to be trigger paced The module listens for a backplane TTL Trigger Upon receipt of a trigger the module goes to its next List point Module in slot 2 The module is connected to 12 V on the DUT The initial voltage setting is Set the voltage mode to List Download the voltage List Set the List to be trigger paced The module listens for a backplane TTL Trigger Upon receipt of a trigger the module goes to its next List point Variations On This Implementation 1 A current List could also have been executed by the module so that for each voltage point a corr
155. the measurement instrument to cause the power module to sequence to the next voltage in a preprogrammed List By buffering these readings in the measurement instrument the entire test can be executed without computer involvement For characterizations that require long measurement times the computer is free to do other tasks For characterizations that must execute at hardware speeds the computer is not involved and will not slow down the test loop In this example the power module must apply 8 to 14 volts in 13 0 5 volt increments to an automotive engine sensor The module varies the bias voltage to the engine sensor and the sensor s output is measured to characterize its performance over the range of possible battery voltages The sensor output is measured by a DMM that has an internal buffer and stores each reading By combining Lists and trigger capabilities the MPS can be used to address this application The module can be programmed to use its triggering capabilities to the fullest extent Each time the module executes the next step in its List and changes voltage the module will generate an external trigger The external trigger will cause the DMM equipped with an external trigger input to take and store a reading The DMM also equipped with a Measurement Complete output sends its output trigger signal to the module to tell the module to go to its next List point Effectively the module and the DMM handshake so that the two functio
156. the trigger subsystem receives a trigger or an ABORt command is given In order for VOLT TRIG to be executed the trigger subsystem must be initiated see INITiate Command Syntax Parameters Default Suffix RST Value Examples Query Syntax Returned Parameters Related Commands SOURce VOLTage LEVel TRIGgered AMPL itude lt NRf gt See Table 3 2 V See Table 3 2 VOLT TRIG 1200 MV VOLT LEV TRIG 1 2 SOURce VOLTage LEVel TRIGgered AMPL itude SOURce VOLTage LEVel TRIGgered AMPLitude MAX SOURce VOLTage LEVel TRIGgered AMPLitude MIN lt NR3 gt VOLT TRIG returns the presently programmed current level If the TRIG level is not programmed the IMM level is returned VOLT TRIG MAX and VOLT TRIG MIN return the maximum and minimum programmable triggered voltage levels ABOR VOLT IMM VOLT MODE INIT RST Language Dictionary 49 Table 3 1 Link Parameter List See Chapter 4 Status Reporting See Chapter 5 Synchronizing Power Module Output Changes Parameter True Event Condition Valid for Constant current event bit OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK Constant voltage event bit OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK ESB Standard event summary bit OUTP DFELINK OUTP TTLT LINK TRIG STAR LINK 15 List sequence complete pulse OUTP TTLT LINK TRIG STAR LINK Operation complete bi
157. this technique parametric measurements could be made on the device during the thermal cycling 3 Multiple modules could be programmed to cycle together in response to the computer trigger command 4 To determine how many times the hybrid was cycled before it failed you can use the SRQ that was generated when the hybrid failed and the module went into CC to timestamp the failure The elapsed time will give the number of cycles executed 84 Application Programs 10 20 30 40 50 60 10 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 210 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 APPLICATION 4 PROVIDING TIME VARYING VOLTAGES PROGRAM APP 4 ASSIGN 51010 TO 70500 INITIALIZE THE MODULE OUTPUT 9 Slot0 RST CLS STATUS PRESET OUTPUT Slot0 VOLT 0 OUTPUT Slot0 CURR 1 OUTPUT Slot OUTPUT ON SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 00 RESET AND CLEAR MODULE START TEST AT OV SET CURRENT LIMIT ENABLE OUTPUT ISET UP OVERCURRENT PROTECTION OCP AND GENERATE SRQ ON OCP TRIP OUTPUT Q Slot CURRENT PROTECTION STATE ON OUTPUT Slot0 OUTPUT PROTECTION DELAY 0 OUTPUT 9 Slot0 STATUS QUESTIONABLE ENABLE 2 OUTPUT Slot0 STATUS QUESTIONABLE PTRANSITION 2 OUTPUT Slot0 SRE 8 ISET UP THE VOLTAGE LIST OUTPUT Slot0 VOLT MODE LIST OUTPU
158. tl TO 70501 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 01 ASSIGN 51042 TO 70502 SELECT CODE 7 MAINFRAME ADDRESS 05 SLOT 02 SETUP MODULE IN SLOT 0 AS 15 V BIAS SUPPLY 1 OUTPUT Slot0 RST CLS STATUS PRESET RESET AND CLEAR MODULE OUTPUTQ SlotO VOLT 0 STARTATOV OUTPUTQ Slot VOLT TRIGGERED 15 15V ON TRIGGER OUTPUTQ StotO TRIGGER SOURCE BUS TRIGGER SOURCE IS Agilent 18 BUS OUTPUT Stot0 OUTPUT TTLTRG SOURCE BUS GENERATE BACKPLANE TTL TRIGGER WHEN GPIB BUS TRIGGER IS RECEIVED OUTPUT Slot0 OUTPUT TTLTRG STATE ON ENABLE BACKPLANE TTL TRIGGER DRIVE OUTPUTQ Slot0 OUTPUT ON ENABLE OUTPUT OUTPUTQ SlotO INITIATE ENABLE RESPONSE TO TRIGGER ISET UP MODULE IN SLOT 1AS 15 V BIAS SUPPLY 1 OUTPUT Slotl RST CLS STATUS PRESET OUTPUT Slotl VOLT 0 OUTPUT Slotl VOLT TRIGGERED 15 OUTPUT Slotl TRIGGER SOURCE TTLTRG OUTPUT Slotl OUTPUT ON OUTPUT Slotl INITIATE RESET AND CLEAR MODULE STARTATOV GO TO 15V ON TRIGGER TRIGGER SOURCE IS BACKPLANE TTL TRIGGER ENABLE OUTPUT ENABLE RESPONSE TO TRIGGER ISET UP MODULE IN SLOT 2 AS 5 V BIAS SUPPLY OUTPUT Slot2 RST CLS STATUS PRESET OUTPUT Slot2 VOLT 0 OUTPUT Slot2 VOLT TRIGGERED 5 OUTPUT Slot2 TRIGGER SOURCE TTLTRG OUTPUT Slot2 TRIGGER DELAY 0 050 OUTPUT Slot2 OUTPUT ON OUTPUT QSlot2 INITIATE RESET AND
159. tput remains at the present level until a trigger sequences the next point in the list Command Syntax SOURce LIST DWEL1 lt NRf gt lt NRf gt Parameters 0 01 to 65 IMINimum MAXimum Default Suffix S Examples LIST DWEL 5 5 1 5 Query Syntax None CURR MODE LIST COUN LIST CURR LIST STEP LIST VOLT VOLT MODE Related Commands LIST DWEL POIN This query returns the number of points specified in LIST DWEL Note that it returns only the total number of points not the point values Query Syntax SOURce LIST DWFL1 POINts Returned Parameters lt NRI gt Example LIST DWEL POIN Related Commands LIST CURR LIST DWEL LIST VOLT LIST STEP This command specifies how list sequencing occurs in response to triggers If LIST STEP AUTO is sent then a single trigger causes the list voltage current or dwell to sequence through all its points The time that a list remains at each point is as specified in the dwell list As soon as the dwell interval expires the list moves to the next point If LIST STEP ONCE is sent then a single trigger advances a list only one point After the specified dwell interval the list remains at that point until the next trigger occurs In either mode triggers that occur during a dwell interval are ignored Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands 38 Language Dictionary SOURce LIST STEP lt CRD gt AUTO ONCE AUTO LIST S
160. trol 78 Application Programs Desired 4 Voltage Ramp Voltage Time in seconds Figure B3 1 Simulating a Slow Voltage Ramp Close up View of Two Steps Desired pd Voltage Voltage 10 90 risetime 0 ms s 200 ms Time milliseconds Figure B3 2 Simulating a Fast Voltage Ramp Variations On This Implementation 1 The module could be set to begin ramping in response to an external or backplane TTL Trigger 2 The module could be set to generate SRQ when it has finished its transition This would notify the computer that the voltage is at the proper level Application Programs 79 3 The module could be set to generate an external trigger when it has finished its transition This trigger could be routed to other instruments as a signal to start making measurements 4 Multiple modules could be programmed to slew together in response to the computer trigger command 5 The module could be set to generate an external trigger for each point in the transition This trigger could be routed to other instruments as a signal to take a measurement at various supply voltages see application 7 6 Many voltage versus time characteristics can be generated by varying the voltage values and the dwell times in the List Last dwell time is not included in the transition 10 V S compuler sends Each Step 8 V 20 trigger 04V command Each Dwell T
161. us of the Operation Condition register as follows see Figure 2 2 OUTPUT PROTECTION CLEAR STATUS OPERATION CONDITION By using the root specifier you could do the same thing in one message OUTPUT PROTECTION CLEAR STATUS OPERATION CONDITION Note The SCPI parser traverses the command tree as described in Appendix A of the IEEE 488 2 standard The Enhanced Tree Walking Implementation given in that appendix is not implemented in the power module The following message shows how to combine commands from different subsystems as well as within the same subsystem see Figure 3 2 VOLTAGE LEVEL 7 PROTECTION 8 CURRENT LEVEL 3 MODE LIST Note the use of the optional header LEVEL to maintain the correct path within the voltage and current subsystems and the use of the root specifier to move between subsystems Including Common Commands You can combine common commands with system commands in the same message Treat the common command as a message unit by separating it with the message unit separator Common commands do not affect the active header path you may insert them anywhere in the message VOLT TRIG 7 5 INIT TRG OUTP OFF RCL 2 00 ON SCPI Data Formats All data programmed to or returned from the power module is ASCII The data may be numerical or character string Numerical Data Table 2 1 and Table 2 2 summarize the numerical formats 14 Introduction To Programming Table 2 1 Numerical Data Formats Symbol Da
162. xecution time of every MEAS query Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands CAL CURR CALibrate AUTO bool ONCE 0I OFFI1I ONI ONCE OFF CAL AUTO 1 CAL AUTO ONCE CALibrate AUTO 011 MEAS CURR MEAS VOLT This command can only be used in the calibration mode It enters a current value that you obtain by reading an external meter You must first select a calibration level CAL CURR LEV for the value being entered Two successive values one for each end of the calibration range must be selected and entered The power module then computes new current calibration constants These constants are not stored in nonvolatile memory until saved with the CAL SAVE command Command Syntax Parameters Default Suffix Examples Query Syntax Related Commands CAL CURR LEV CALibrate CURRent DATA lt NRf gt See Table 3 2 A CAL CURR 3222 3 CAL CURR DATA 5 000 None CAL SAVE CAL STAT This command can only be used in the calibration mode It sets the power module to a calibration point that is then entered with CAL CURR DATAJ During calibration two points must be entered and the low end point MIN must be selected and entered first Command Syntax Parameters Examples Query Syntax Related Commands CAL PASS CALibrate CURRent LEVel lt CRD gt MINimum IMAXimum CAL CURR LEV MIN CAL CURR LEV MAX None CAL CURR DATA CAL STAT This command
163. y with this requirement Character Data Character strings returned by query statements may take either ofthe following forms depending on the length of the returned string lt CRD gt Character Response Data Permits the return of character strings lt AARD gt Arbitrary ASCII Response Data Permits the return of undelimited 7 bit ASCII This data type has an implied message terminator Introduction To Programming 15 System Considerations The remainder of this chapter addresses some system issues concerning programming These are power module addressing and the use of the following types of GPIB system interfaces 1 HP Vectra PC controller with Agilent 82335A GPIB Interface Command Library 2 IBM PC controller with National Instruments GPIB PCII Interface Handler 3 Agilent controller with Agilent BASIC Language System Note Some specific application programs are given in Appendix B Assigning the GPIB Address in Programs The power module address cannot be set remotely It is determined by the position of the mainframe address switch and the position of power module slot position within the mainframe See the Mainframe Users Guide for details The following examples assume that the GPIB select code is 7 the mainframe interface address is 6 and that the power module address will be assigned to the variable PM3 power module in the third mainframe slot 1060 Power Module installed in Primary Mainframe 1070 PM3 7
164. ype 100 thru 199 Command 300 thru 399 Device dependent 3 200 thru 299 Execution 2 A00thru 499 Query Table 6 1 Summary of System Error Messages Ru Error String Description Explanation Examples Command error generic Invalid character Syntax error unrecognized command or data type Invalid separator Data type error e g numeric or string expected got block date GET not allowed Parameter not allowed too many parameters Missing parameter too few parameters Program mnemonic too long maximum 12 characters Undefined header operation not allowed for this device Invalid character in number includes 9 in octal data etc Numeric overflow exponent too large exponent magnitude gt 32 Too many digits number too long more than 255 digits received Numeric data not allowed Invalid suffix unrecognized units or units not appropriate Suffix not allowed Invalid character data bad character or unrecognized Character data not allowed String data error Invalid string data e g END received before close quote String data not allowed Invalid block data e g END received before length satisfied Block data not allowed Execution error generic Parameter error Error Messages 65 Table 6 1 Summary of System Error Messages continued Error Error String Description Explanation Examples Number 222 Data out of range e g too large for this dev

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