Agilent Technologies 66lxxA manual Advantages/Benefits Of The MPS Solution

Page 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 Complete" 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

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Contents Programming Guide Agilent Part No Microfiche Part No Update AprilSafety Guidelines Contents Abor Status Reporting Error Messages Synchronizing Power Module Output ChangesExternal References IntroductionAbout This Guide Documentation SummarySupported Applications VXIplug&play Power Products Instrument DriversDownloading and Installing the Driver Accessing Online HelpIntroduction To Scpi Gpib Capabilities Of The Power ModuleIntroduction To Programming Module Gpib AddressRST *IDN? *SRE Voltlev 8.0 Prot 8.8 CURR? Volt LEV Prot CurrOutpprotdel Effect of Optional Headers Traversing the Command TreeVolttrig 7.5INIT*TRG Outp OFF*RCL 2OUTP on Outputprotectionclear STATUSOPERATIONCONDITION?OUTPUTPROTECTIONCLEARSTATUSOPERATIONCONDITION? Voltagelevel 7PROTECTION 8CURRENTLEVEL 3MODE ListSuffixes and Multipliers Class Unit Unit with Multiplier SymbolNumerical Data Formats Talking Formats Listening FormatsAssign @PM3TO System ConsiderationsAgilent Basic Controllers Error HandlingUsing the National Instruments Gpib Interface Sending the Command Volt 5 in C Sending the Command Volt 5 in BasicReceiving Module Data with Basic Receiving Data from the ModuleReceiving Module Data with C Introduction Language DictionaryDescription Description Of Common CommandsCLS Meaning and TypeESR? Bit Configuration of Standard Event Status Enable RegisterESE ESEOPC? IDN?OPC PSC OPT?RST RCLRCL SRE SAVSRE TRG Bit Configuration of Status Byte RegisterSTB? Abor Description of Subsystem CommandsTST? WAICalauto Subsystem Tree Diagram Calibration SubsystemCalpass Calauto 1 Calauto OnceCalcurr CalcurrlevCalvoltlev CalsaveCalstat CalvoltCurrmode CalvoltprotCurr Curr 500 MA CurrlevCurrtrig 1200 MA Currlevtrig CurrprotstatCurrprotstat OFF CurrtrigListcurr Init Initcont 1 Initcont onListcoun Listcoun Listcoun INFListstep LISTCURRPOIN?Listdwel LISTDWELPOIN?MEASCURR? MEASVOLT? ListvoltListvolt 2.0,2.5,3.0 Listvolt MAX,2.5,MIN LISTVOLTPOIN?Outpprot Outp Outpstat ON,NORELAYNorm Outpprotcle Outpprotdel 75E-1Outprel OutprelpolOutpttltsour Link OutpttltOutpttlt 1 Outpttlt OFF OutpttltlinkStatoperenab STATOPER?STATOPEREVEN? STATOPERCOND?Statpres Stat Oper NTR 32 Stat Oper PTRStat Ques COND? STATQUES?STATQUESEVEN? STATQUESCOND?Trig SYSTERR?SYSTVERS? Trigger SubsystemTriglink Trig Trig IMMTrigdel Trigdel .25 Trigdel MAXVoltmode List Voltmode FIX VoltVoltlev VoltmodeVolttrig 1200 MV Voltlevtrig VOLTSENSSOUR?Volttrig Link Parameter List Power Module Programming ParametersOperation Status Group Power Module Status StructureStatus Register Bit Configuration Status ReportingQuestionable Status Group Bit Signal Bit Configurations of Status Registers MeaningStatus Questionable Commands Query Standard Event Status Group Power Module Status ModelLocation Of Event Handles Status Byte RegisterOutput Queue Examples Initial Conditions At Power OnStatoperptr 1024NTR Statoperenab 1024*SRE Statoperptr 5376ENABStatquesptr 18ENAB STATOPEREVEN?QUESEVEN?Model of Fixed-Mode Trigger Operation Synchronizing Power Module Output ChangesTrigger Subsystem Initiated State Delaying StateIdle State Output Change State Model of List Mode Trigger OperationINITiateCONTinuous Command Trigger Status and Event SignalsOutpttltsour List Subsystem Triggering a List Listvolt 3.0,3.25,3.5,3.75 Listdwel 10,10,25,40Automatically Repeating a List Listcurr 2,3,12,15Timing diagrams of Liststep Operation RI Remote Inhibit Subsystem DFI Discrete Fault Indicator SubsystemScpi Command Completion Standard Event Status Register Error Bits Error MessagesPower Module Hardware Error Messages System Error Messages222 -223 -241 -310 -330 -350 -400 -410 -420 -430 Scpi Version Scpi Confirmed CommandsScpi Approved Commands Scpi Conformance InformationNon-SCPI Commands Application Programs Application 1. Sequencing Multiple Modules During Power Up Variations On This Implementation Figure B1-1. Block Diagram of Application #1Figure B1-2. Timing Diagram of Application #1 Enable Response to Trigger Reset and Clear ModuleEnable Backplane TTL Trigger Drive Enable OutputImplementation Details How The MPS Implements The Solution MPS Set Up Figure B2-1. Block Diagram of Application #2 Start AT 15 When a CV-TO-CC Transition OccursEnable TTL Trigger Drive Enable Response to TTL TriggerApplication 3. Controlling Output Voltage Ramp Up at Turn On Figure B3-1. Simulating a Slow Voltage Ramp Generating the Desired Voltage Ramp for Application #3 Seconds Option BaseStart Voltage for Ramp Stop Voltage for RampFigure B4-1. Voltage Waveform for Application #4 Application 4. Providing Time-Varying VoltagesModule set up Variations On This Implementation Enables Detection on Positive TRANSITION, I.E Enable OCPNo Delay Before Protection Occurs Enable Detection of OC ConditionApplication 5. Providing Time-Varying Current Limiting Figure B5-1. Typical DUT Current vs. Time Implementation Details How The MPS Implements The Sequence SET to GET Current from List GO to 12 V When TriggeredCurrent Limit Data Dwell Time DataNominal 12 Application 6. Output Sequencing Paced by the ComputerMPS Set Up Figure B6-1. Block Diagram of Application #6 Number of Bias Supply Limit C0MBINATIONS These are the BiasSupply Limit Conditions To be TestedReturn Overview Of Application Advantages/Benefits Of The MPS Solution Figure B7-1. Block Diagram of Application #7 Enable Intr Identify Handler Subroutine When the Module Indicates SIC Step CompletedWhen IT Completes the LIST. OPC Generates SRO Enable SRQ InterruptSupplemental Information CMD$ = Voltmode List ‘ SET to GET Voltage from List CMD$ = Output on ‘ Enable OutputCMD$ = Initiate ‘ Enable Trigger to Start List ‘ Conversion to Send Real Numbers Over the BUSWend Call Iooutputs SLOTO, CMDS, LWaiting for Trigger BIT 5 of the Operation Status Register CONDITION.DATA =‘ INSTRUMENT.NAME$ = Sloto ‘ Disable Auto Serial PollIf IBSTA% 0 then Goto ‘ AS Part of the Command String ‘ Program N3.BASStop ‘ General Error HandlerIf IBSTA% 0 then Goto Selected AS a Trigger Source Dwell = ramptime Application #3 Controlling Voltage Ramp UP AT Turn onTo terminate the iooutputa Int error Char *badstring If error != EOl enabled for both read and write Strcatvlist, vpoint This is a generalized error checking routine Index IndexIndex Index Index United States Latin America Agilent Sales and Support OfficesManual Updates