Agilent Technologies 66lxxA manual Output Change State, Model of List Mode Trigger Operation

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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: COUNt 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 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

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Contents Agilent Part No Microfiche Part No Update April Programming GuideSafety Guidelines Contents Abor Status Reporting Synchronizing Power Module Output Changes Error MessagesDocumentation Summary IntroductionAbout This Guide External ReferencesAccessing Online Help VXIplug&play Power Products Instrument DriversDownloading and Installing the Driver Supported ApplicationsModule Gpib Address Gpib Capabilities Of The Power ModuleIntroduction To Programming Introduction To ScpiRST *IDN? *SRE Volt LEV Prot Curr Voltlev 8.0 Prot 8.8 CURR?Outpprotdel Traversing the Command Tree Effect of Optional HeadersVoltagelevel 7PROTECTION 8CURRENTLEVEL 3MODE List Outputprotectionclear STATUSOPERATIONCONDITION?OUTPUTPROTECTIONCLEARSTATUSOPERATIONCONDITION? Volttrig 7.5INIT*TRG Outp OFF*RCL 2OUTP onListening Formats SymbolNumerical Data Formats Talking Formats Suffixes and Multipliers Class Unit Unit with MultiplierSystem Considerations Assign @PM3TOError Handling Agilent Basic ControllersUsing the National Instruments Gpib Interface Sending the Command Volt 5 in Basic Sending the Command Volt 5 in CReceiving Data from the Module Receiving Module Data with BasicReceiving Module Data with C Language Dictionary IntroductionMeaning and Type Description Of Common CommandsCLS DescriptionESE Bit Configuration of Standard Event Status Enable RegisterESE ESR?OPC IDN?OPC? OPT? PSCRCL RCLRST SRE SAVSRE STB? Bit Configuration of Status Byte RegisterTRG WAI Description of Subsystem CommandsTST? AborSubsystem Tree Diagram Calibration Subsystem CalautoCalcurrlev Calauto 1 Calauto OnceCalcurr CalpassCalvolt CalsaveCalstat CalvoltlevCurr 500 MA Currlev CalvoltprotCurr CurrmodeCurrtrig CurrprotstatCurrprotstat OFF Currtrig 1200 MA CurrlevtrigListcoun Listcoun INF Init Initcont 1 Initcont onListcoun ListcurrLISTDWELPOIN? LISTCURRPOIN?Listdwel ListstepLISTVOLTPOIN? ListvoltListvolt 2.0,2.5,3.0 Listvolt MAX,2.5,MIN MEASCURR? MEASVOLT?Outp Outpstat ON,NORELAY OutpprotOutprelpol Outpprotcle Outpprotdel 75E-1Outprel NormOutpttltlink OutpttltOutpttlt 1 Outpttlt OFF Outpttltsour LinkSTATOPERCOND? STATOPER?STATOPEREVEN? StatoperenabStat Oper NTR 32 Stat Oper PTR StatpresSTATQUESCOND? STATQUES?STATQUESEVEN? Stat Ques COND?Trigger Subsystem SYSTERR?SYSTVERS? TrigTrigdel .25 Trigdel MAX Trig Trig IMMTrigdel TriglinkVoltmode VoltVoltlev Voltmode List Voltmode FIXVolttrig VOLTSENSSOUR?Volttrig 1200 MV Voltlevtrig Power Module Programming Parameters Link Parameter ListStatus Reporting Power Module Status StructureStatus Register Bit Configuration Operation Status GroupStatus Questionable Commands Query Bit Signal Bit Configurations of Status Registers MeaningQuestionable Status Group Power Module Status Model Standard Event Status GroupOutput Queue Status Byte RegisterLocation Of Event Handles Initial Conditions At Power On ExamplesSTATOPEREVEN?QUESEVEN? Statoperptr 5376ENABStatquesptr 18ENAB Statoperptr 1024NTR Statoperenab 1024*SRETrigger Subsystem Synchronizing Power Module Output ChangesModel of Fixed-Mode Trigger Operation Idle State Delaying StateInitiated State Trigger Status and Event Signals Model of List Mode Trigger OperationINITiateCONTinuous Command Output Change StateOutpttltsour List Subsystem Listcurr 2,3,12,15 Listvolt 3.0,3.25,3.5,3.75 Listdwel 10,10,25,40Automatically Repeating a List Triggering a ListTiming diagrams of Liststep Operation Scpi Command Completion DFI Discrete Fault Indicator SubsystemRI Remote Inhibit Subsystem System Error Messages Error MessagesPower Module Hardware Error Messages Standard Event Status Register Error Bits222 -223 -241 -310 -330 -350 -400 -410 -420 -430 Scpi Conformance Information Scpi Confirmed CommandsScpi Approved Commands Scpi VersionNon-SCPI Commands Application Programs Application 1. Sequencing Multiple Modules During Power Up Figure B1-1. Block Diagram of Application #1 Variations On This ImplementationFigure B1-2. Timing Diagram of Application #1 Enable Output Reset and Clear ModuleEnable Backplane TTL Trigger Drive Enable Response to TriggerImplementation Details How The MPS Implements The Solution MPS Set Up Figure B2-1. Block Diagram of Application #2 Enable Response to TTL Trigger When a CV-TO-CC Transition OccursEnable TTL Trigger Drive Start AT 15Application 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 Stop Voltage for Ramp Option BaseStart Voltage for Ramp SecondsApplication 4. Providing Time-Varying Voltages Figure B4-1. Voltage Waveform for Application #4Module set up Variations On This Implementation Enable Detection of OC Condition Enable OCPNo Delay Before Protection Occurs Enables Detection on Positive TRANSITION, I.EApplication 5. Providing Time-Varying Current Limiting Figure B5-1. Typical DUT Current vs. Time Implementation Details How The MPS Implements The Sequence Dwell Time Data GO to 12 V When TriggeredCurrent Limit Data SET to GET Current from ListApplication 6. Output Sequencing Paced by the Computer Nominal 12MPS Set Up Figure B6-1. Block Diagram of Application #6 To be Tested These are the BiasSupply Limit Conditions Number of Bias Supply Limit C0MBINATIONSReturn Overview Of Application Advantages/Benefits Of The MPS Solution Figure B7-1. Block Diagram of Application #7 Enable SRQ Interrupt When the Module Indicates SIC Step CompletedWhen IT Completes the LIST. OPC Generates SRO Enable Intr Identify Handler SubroutineSupplemental Information ‘ Conversion to Send Real Numbers Over the BUS CMD$ = Output on ‘ Enable OutputCMD$ = Initiate ‘ Enable Trigger to Start List CMD$ = Voltmode List ‘ SET to GET Voltage from ListCONDITION.DATA = Call Iooutputs SLOTO, CMDS, LWaiting for Trigger BIT 5 of the Operation Status Register Wend‘ Program N3.BAS ‘ Disable Auto Serial PollIf IBSTA% 0 then Goto ‘ AS Part of the Command String ‘ INSTRUMENT.NAME$ = SlotoIf IBSTA% 0 then Goto Selected AS a Trigger Source ‘ General Error HandlerStop Application #3 Controlling Voltage Ramp UP AT Turn on Dwell = ramptimeTo 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 Agilent Sales and Support Offices United States Latin AmericaManual Updates
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