Trigger control via Gpib, TRIGgerSOURce BUS

3 - 16

USING THE COMBISCOPE INSTRUMENTS

3.3.7Trigger control via GPIB

You need a separate GPIB command to start a measurement synchronized with other instruments. This is done by sending the *TRG command or the GET (Group Execute Trigger) code. The MEASure? and READ? queries do not allow you to do so, because such a setup causes a query error. With the INITiate[:IMMediate] and FETCh? concept, it is possible to meet the requirements of such applications.

Example:
CONFigure:AC	Configures the instrument to measure the AC-RMS
	voltage.
TRIGger:SOURce BUS	Specifies that the acquisition is to be triggered by
	GET or *TRG.
INITiate	Starts the measurement process.
*TRG	Triggers the acquisition.
FETCh:AC?	Determines and returns the AC-RMS value.

Page 35

Image 35

Fluke PM-3380B, PM-3390B, PM-3370B, PM-3394B, PM-3384B Trigger control via Gpib, TRIGgerSOURce BUS, INITiate, FETChAC?

Contents

Qvwuxphqw Trademarks Initializing the CombiScope Instrument IIIAbout this Manual What this Manual Contains Measuring Signal Characteristics 15.1.2 15.4.2 Error-reporting using the SRQ mechanismReadout of measurement data 15.1.1 Application Program Examples . . . . . . . . . . . . . A-1 Command Reference VII About this Manual What this Manual Contains About this Manual Programming environment System setupPreparations for Scpi Programming Getting Started with Scpi Programming Constant -1 Ffff hex CommandCommands Addresslist Programming Note Program Example Initializing the CombiScope Instrument How to reset the CombiScope instrumentHow to identify the CombiScope instrument How to switch between digital and analog mode ’Requests for error Error Reporting Example Acquiring TracesChannels and memory registers Example Send -- FORMat INT,16 Format of the trace response data is as follows This string data How to acquire a single shot tracePreparations Connect a probe from the Probe Adjust signal to channel How to acquire repetitive traces INITiate + FETCh? Measuring Signal CharacteristicsCONFigure + READ? MEASure? How to make repeated measurements How to make a single shot measurement Introduction Using the Combiscope Instruments Using the Combiscope Instruments RCL Fundamental Programming ConceptsTRACe? CH1 SAV Measurement instructions DISPlayMENU TRIGgerSYSTemKEY Explanation of the Instrument Model Single function programming using the instrument model Read ← blockdata Instrument setup Instrument setup Front panel simulation MEASureAC? MEASure? query Generic form of a measurement instruction is as follows Benefits of using parametersVoltageparameters = expectedvoltage,resolution MEASureVOLTageFREQuency? 10E6, @3 ExamplesMEASureAMPLitude? MEASureVOLTageAMPLitude? 10, @2 Waveform measurements Pulse characteristics FTIMe = alias for Falltime RTIMe = alias for Risetime MEASureFALLTIME? @3MEASureRISETIME? 20,80 Measurefunctionmeasureparameters SENSeAVERageCOUNT Customizing settingsCONFigureAC SENSeAVERage on Multiple measurements CONFigureRISETIMEREADRISEOVERshoot? Starts a Next acquisition Returns New Frequency result Multiple characteristics from a single acquisitionREADFREQuency? Starts Acquisition Returns FETChAC? Trigger control via GpibTRIGgerSOURce BUS INITiate M12,CH2 Fetching characteristics from memory traces Acquisition control Acquisition Using the Combiscope Instruments Trigger Level TriggeringTrigger Type Trigger Source Trigger Coupling Trigger Slope AC Coupling 10 Hz cutoff frequency DC Coupling 0 Hz cutoff frequencyDC Coupling Video triggering LF-REJECT 30 KHz cutoff frequencyHF-REJECT 30 KHz cutoff frequency Secam NtscLines per frame PAL BUS Trigger modesOFF Line State Description Commands Trace Pre- and post-triggering External triggering 10 The trace acquisition flow Reading trace acquisitions Repetitive acquisitions Single-shot acquisition 11 Relation between screen position and trace value Conversion of trace data ’Array of 512 integers Byte1 = ASCMID$response$, J Ps = Ts / 25600 * 100 = Ts Ps = TsFor 8-bit sample traces ’1-byte samples Using the Combiscope Instruments Program Example AVGn = ∑X1 + .. + Xn ⁄ n Averaging Acquisition Data 13 The Trigger Model during acquisition averaging Programming tip Channel Selection 1 AC/DC/ground coupling Signal Conditioning Vertical range and offset Input filteringInput impedance Input polarity Limitation Vs = Ts / 200 * PTPeak OFFSetAutoranging attenuators MTB = 50 * SENSeSWEepTIME / TRACePOINts Time Base ControlNumber of samples Time base speed Real time acquisition Ts = sampleindex * SENSeSWEepTIME / TRACePOINts Autoranging time base 16 Definition of a signal period Send → CALCulateFEED M21 ’M21 = source for CALC1 How to do post processingPost Processing Select the source for the post processing function Optional Standard AvailableMathematical calculations Math Read ← tracebuffer ’Reads M21 trace Check the result of the post processing functionExample Send → TRACe? M21 Differentiating and integrating traces Mathematical calculations Absolute FFT Frequency domain transformationsRelative FFT Trace data Trace Point ValuesFor 16-bit samples Ps = Ts 25600 Vrms offset calculation This can be calculated as a signal levelExample for attenuator setting 0.5 V/div DBμV = 1 μV 1.0E-6 V at 50Ω impedance DBm 50Ω offset calculationDBm 600Ω offset calculation DBμV offset calculation Fs = sampleindex * 1250 / TRACePOINts * MTB SettingTrace Point Frequencies Program Example Frequency filtering Histogram functionsAmplitude belt = peak-to-peak range 20 Trace memory control Trace Memory Trace formatting Channels Memory Registers StandardPM33x0B 512 +EXT Extended Copying traces to memory Read ← trace block Writing data to trace memorySend → TRACe? CH3 ’Queries for CH3 trace Reading data from trace memory Menu Screen/Display FunctionsBrightness control Display functions Description Measurement ValueMEAS1/MEAS2 Data Meastype,measvalue,suffixunit Math FFT Data Cursors DataType Unit Description Call Send0, 8, DISPlayMENU MEASure Selection of softkey menus Display of user-defined textProgram Example 2 text as block data Hplaser Print/Plot FunctionsDevice Type Hpgl 22 Hardcopy of screen on printer/plotter Auto Calibration Real-Time Clock = okay Status data for the CombiScope instruments Status Reporting RANGing Digital modeOperation status data CALibrating CALibration TEMPeratureQuestionable status data VOLTage Status Register Data Structure Preset Value How to reset the status data Program example using the status byte STB How to enable status reporting ’Defines SRQ-routine Error-reporting routine How to report errors ’Sends error query How to save/restore a setup via the Gpib controller Saving/Restoring Instrument SetupsHow to restore initial settings How to save/restore a setup via instrument memory Row 801 How to simulate the pressing of a front panel keyFront Panel Simulation Row 201 Autoset Simulation How to simulate the operation of a softkey menu MULTiple-shot Functions not Directly ProgrammableEnvelope DISPlayMENU ACQuireSYSTemKEY 3 toggles on/off Terminal symbols Syntax specification notationsMeta symbols Non-terminal symbols MEASureVOLTageDC? is the same DefaultNot contain the message element Between the square brackets, without Preceded by a sign, e.g Data typesAn explicit decimal point and may or may not be ’This also’ Bit codesDouble quotes Examples This is a string Command Summary Gate Feed DATA? Command Reference ParametersMenu Name State Read Auto TYPE? Bits DTRRTS Baud Type PAL Secam Ntsc Hdtv ALL Referencelow ,referencehigh,expectedtime Expectedvoltage ,resolutionTimeresolution Measurefunction Measureparameters Command Descriptions Specifies the compliance with front panel operations ErrorsFront panel compliance Limitation CAL? CALibrationSyntax *CAL? Response 0 Calibration okay Calibration not okay Clear Status 16COMMAND Reference *ESE #H11 Event Status EnableByte Register. Alternative commands *ESE #B10001 Ation Complete bits to be summarized in the Status PON URQ CME EXE DDE QYE RQC OPC ESR 18COMMAND ReferenceEvent Status Register Response Integer Description Syntax *IDN? IDN? Identification Restrictions 20COMMAND ReferenceOperation Complete Query form *OPC? Response Description Ieee EXT EM MP OPT? Option identification Syntax RCL numericdata Description Recall instrument setup22COMMAND Reference Syntax *RST Description RST ResetFunction Default Settings Cursors Beeper Hardcopy Print & Plot Plotter Hpgl Pass/Fail testingMeasure 1 Math 1 Syntax SAV numericdata Description Save instrument setup Request Enable Register Service Request Enable26COMMAND Reference Syntax STB? Response Integer Description STB? Status Byte Syntax *TRG Description TRG Trigger Self-test okay Self-test not okay TST? Self-testSyntax *TST? Response 0 Command Reference Aborts the current acquisition Configures for AC-RMS valueABORt Syntax ABORt Description Function on Switches the differentiateCALCulatenDERivativePOINts CALCulatenDERivativeSTATe CALCulatenFEED Filter function turned off Filter function turned on Integrate function turned off Integrate function turned on CALCulatenINTegralSTATe CALCulatenMATHEXPRession Switches MATH2 function on CALCulatenMATHSTATe Switches MATH1 function on Response ABS REL Query form CALCulatenTRANsformFREQuencyTYPE? Selects MATH2-FFT-HANNing window Switches MATH2-FFT onSelects relative MATH2-FFT calculation Histogram function turned off Histogram function turned on SwitchesCALCulatenTRANsformHISTogramSTATe Response 0 Description CALibrationALLSyntax CALibrationALL Query form CALibrationALL? Conditions Starts auto calibrationReads condition register Syntax elements are specified with the MEASure? query CONFigureSyntax CONFigureVOLTagemeasurefunction Initiates + fetches AC-RMS Signal on channelExpected voltage 600 mV Channel 2 AC coupled NR30.00E00 .. .00E00 DISPlayBRIGhtnessQuery form DISPlayBRIGhtness? MINimum MAXimum Response NR3 DISPlayMENUNAME Display turned off Display turned on Switches TB Mode menu display onDISPlayMENUSTATe Response is peak-peak value of 608.4 mV MEAS1 Type Analog Mode Digital ModeDISPlayWINDow1TEXTnDATA? Syntax DISPlayWINDow1TEXTnDATA? Display on Clears all user text DISPlayWINDow2TEXT1CLEar Character byte DISPlayWINDow2TEXT1DATAAs text Sends 25 decimal Command Reference DISPlayWINDow2TEXT1STATe Voltageparameters, measureparameters 54COMMAND ReferenceFETCh? FETChVOLTagemeasurefunction? Restrictions Acquisition INT,8 FORMatDATA HCOPyDATA? HCOPyDEVice Response 1 INITiateCONTinuous Single shot acquisition INITiateIMMediateSyntax INITiateIMMediate Trigger level becomes INPutnCOUPling Common low pass filter off Common low pass filter on INPutnFILTerLPASsSTATe INPutnFILTerLPASsFREQuency?Response 2.00E+07 Query form INPutnFILTerLPASsSTATe? Syntax INPutnIMPedance NRf MINimum MAXimum 1E6 After a *RST command, the impedance is 1 MΩINPutnIMPedance Response Norm INV Description INPutnPOLarity Anal INSTrumentNSELect INSTrumentSELectResponse DIG Anal DIG Measurefunction measureparameters MEASure?Channellist = High Falltime Ratio percentage of the positive width PWIDth Signal. The peak to peak value is the difference betweenFirst falling edge equals the REFerence MIDDle until PDUTycycle Referencemiddle Measureparameters Risetime Periodresolution = NRf DEFault Executed. The unit of timeresolution is secondFrequencyresolution = NRf DEFault Referencemiddle is volt Expectedperiod = NRf DEFault Limitations Description Syntax READVOLTagemeasurefunction? 74COMMAND Reference Example SENSeAVERageSTATe Initiates trace averaging SENSeAVERageCOUNt SENSeAVERageTYPE?Syntax SENSeAVERageCOUNt NRf 8 16 SENSeAVERageTYPE? Response Scal Addition of channel i+j is off Addition of channel i+j is on SENSeFUNCtionOFF SENSeFUNCtionON SENSeFUNCtionSTATe? Limitations SENSeSWEepOFFSetTIME SENSeSWEepPDETectionSTATe Reads AC-RMS Real-time mode switched off Real-time mode switched onSENSeSWEepREALtimeSTATe Slope = either pos. or neg Base range is limited to 10 μs non-alternating time base MTB values in the digital modeSENSeSWEepTIME Query form SENSeSWEepTIME? MINimum MAXimum Requests nr of trace points Coupled valuesRequests sweep time Reads sweep time Sets autoranging MTB on Autoranging MTB switched off Autoranging MTB switched onSENSeSWEepTIMEAUTO Sets trigger source CH1 Autoranging CH2 Switches CH1 onSwitches CH2 on SENSeVOLTagenDCRANGeAUTO Channel SENSeVOLTagenDCRANGeOFFSet Query form SENSeVOLTagenDCRANGePTPeak? MINimum MAXimum SENSeVOLTagenDCRANGePTPeak Trigger source = Peak-to-peak =Sensitivity = 0.8 / 8 = 100 mV/div Response NR1 Description BIT Decimal Meaning Number Value Status Register Filter / Enable Preset Value STATusPRESetSyntax STATusPRESet Following table defines the effect of STATusPRESet Response NR1 Description Enables report of TEMPerature within allowed limits 1 TEMPerature too high or too lowReturned value 16 equals bit 4 set temperature too high/low Enables report of TEMPerature too high/low 0 350,Queue overflow No errorError number is -222 and the meaning is Data out of range STATusQUEueNEXT? SYSTemBEEPer SYSTemBEEPerSTATe Beeper disabled Beeper enabledReads the error queue Beeps on error Stan Wire controlResponse on Stan Response 7 XONNone Even ODD None Becomes Response XON NoneNo X-on/X-off handshaking 1200 Sets the system date to Nov 7 SYSTemDATE SYSTemERRor? Response NR1 SYSTemKEY Front Panel KEY Returns the last key simulation Enables Utility softkey menu SYSTemSET Nodenr nodelength firstbyte ... lastbyte SYSTemTIME Response YYYY.V *RST command doesn’t change the current Scpi versionSYSTemVERSion? Syntax SYSTemVERSion? TRACeCOPY Response definiteblock TRACeDATA Initiates single acquisition Reads peak-to-peak Requests channel 1 traceReads channel 1 trace Queries peak-to-peak TRACePOINts Reads M23 trace Number of trace points for allRequests M23 trace Low-pass filter active High-pass filter active HF-reject Pass BooleanSets high-pass filter off Sets high-pass filter on Low-Pass filter off Automatically switchesFilter Frequency LOW-PASS on HIGH-PASS on DC coupling HF-reject AC coupling KHz LF-reject TRIGgerSTARtFILTerLPASsSTATe Boolean TRIGgerSEQuence1FILTerLPASsFREQuency NRfTRIGgerSEQuence1FILTerLPASsSTATe Boolean TRIGgerSTARtFILTerLPASsFREQuency NRf Sets cutoff frequency = 30 KHz FilterFrequency LOW-PASS on HIGH-PASS on TRIGgerSEQuence1HOLDoff TRIGgerSTARtHOLDoff TRIGgerSTARtLEVelAUTO Boolean TRIGgerSEQuence1LEVel NRf MINimum MAXimumTRIGgerSEQuence1LEVelAUTO Boolean TRIGgerSTARtLEVel NRf MINimum MAXimum Trigger level becomes 0.2 Trigger source BecomesChannel Continuous initiation Div. sensitivity NEG After a *RST command, the trigger slope is POSitiveTRIGgerSEQuence1SLOPe TRIGgerSTARtSLOPe POS Rising and negative falling Configures AC-RMS CH2Sets real-time mode on Triggering is done at positive EXT TRIGgerSEQuence1SOURce TRIGgerSTARtSOURceIMM Single initiation Configures AC-RMS CH1Input channel 1 becomes Trigger source Selects edge triggering TRIGgerSEQuence1TYPE TRIGgerSTARtTYPEEdge Numb Selects lines triggering Selects video line Linenr = linenr + 625/2 linenr = linenr 625/2Selects TV video Selects video lines Scam Secam Secam Ntsc Hdtv Scam Lines/frame Selects Hdtv SelectsLines/frame Selects Lines/frame Selects Secam Response POS NEG Positive video signal polarity selected PAL or Secam From 1 to 123 Selects Negative Video Signal polarity Application Program Examples Making a Hardcopy of the Screen Pass/Fail TestingError reporting is invoked as follows Call errorcheck Application program Making automatic measurementsApplication summary FETChNWIDth? ’Termination Receive on EOI Making programmed measurements Reading measurement values Acquiring Waveform Traces Save/recall settings to/from internal memory Saving/Recalling Instrument Setups Application summary Application program Ieee Making a Hardcopy of the ScreenCombiScope Instrument Saving a pass/fail test setup Pass/Fail Testing Application program Restoring a pass/fail test setup DISPlayMENU MEASure Running a pass/fail test Channel 4 is external trigger input for PM33x0B Cross Reference Front Panel Keys / CommandsCross References Page Acquire menu Cross Reference Softkey Menus / Commands Cursors menu Programmable with the *SAV/*RCL and Systset commands Ext instead of ch4 for PM33x0B Display menu Other functions with RCL/SAV and Systset Mathplus Math menu Yes no Page DTB DEL’D TB menu Measure menu SAVE/RECALL menu Setups menu Systset RCL/SAV TB Mode menu Trigger menu Analog Mode Logic Utility menu Wire Ieee Inpfilt Onoff INP1IMP INP2IMP INP3IMP INP4IMP Vertical menu Cross Reference Functions / Commands Calibration Autocal Function + KEYS/MENUS Related Scpi Commands AutosetAverage BW Limit Differentiate Mathplus DelayDelay Measurement Delayed Timebase DEL’D TB CH1 FFT ON/OFFHistogram Mathplus Hold OFF Main Time Base Integrate MathplusLogic Trigger Magnify Horizontal Measure Menu Function + KEYS/MENUS Related Scpi Commands MathematicsPass Fail Testing Mathplus SAV, *RCL Power Supply Probe Utilities Remote Control IEEE-488.2Remote Setup Remote Control RS-232 Text OFF Function + KEYS/MENUS Related Scpi CommandsStatus Screen Subtract Mathematics Roll TrigSingle Multi Trigger Main TB Trigger CouplingTrigger DEL’D TB Trigger Level Util Screen & Sound User TextUtil Menu DISPlayWINDow1TEXT12DATA? Abbreviations Used IFC IDYIDN IEC RQS Manual Conventions RAMREN RQC 4MANUAL Conventions Glossary of Symbols UsedList of Tables List of Figures Documents Referenced Or abbreviation, e.g., type = Hdtv TRIGgerSEQuence1 STARtVIDeoFORMatTYPE type command PurposeScpi Conformance Information Standards Information List of Implemented IEEE-488.2 Syntactical Elements Program Header Separator Command Program HeaderStandards Information Program Message Unit Separator Program Data Separator Common vertical settings End node settingsChannel 1/2/3/4 settings Probe scale settings Cursor autosearch settings Delayed timebase settingsEvent trigger delay settings Cursor settings Display trace position settings MATH1/2 settingsDisplay settings Trace intensity settings Index Numerics Index Index Index Index Index Index Index Index Index Index Index

Fluke PM-3380B, PM-3390B, PM-3370B Trigger control via Gpib, TRIGgerSOURce BUS, INITiate, FETChAC?

Models: PM-3394B PM-3390B PM-3370B PM-3380B PM-3384B

USING THE COMBISCOPE INSTRUMENTS

3.3.7Trigger control via GPIB

Example:

CONFigure:AC

TRIGger:SOURce BUS

INITiate

*TRG

FETCh:AC?