Frequency Profiling, 50 ‘, Open O, 1, PROFILE.DAT

Programming Examples

3. Frequency Profiling

Frequency profiling visualizes frequency variations for a certain time. This program gives an output file called:

PROFILE.DAT. If this file is imported to a spreadsheet program, for instance Excel, you can create a graph like the one in the figure below.

Figure 4-1This figure is the results of frequency profiling on a sweep generator.

50 ‘

60 OPEN “O”, 1, “PROFILE.DAT”

70 CNTNAME$ = “DEV10"

80 CALL IBFIND (CNTNAME$, CNT%)

90‘

100‘

110‘ —— Enable arming, etc. ——

120WRT$ = “:TRIG:COUN 1; :ARM:COUN 1; SOUR EXT4"

130CALL IBWRT(CNT%, WRT$)

140WRT$ = “:INP:LEV:AUTO ONCE

150CALL IBWRT(CNT%, WRT$)

160WRT$ = “:DISP:ENAB OFF; :ACQ:APER 1E-6"

170CALL IBWRT(CNT%, WRT$)

180‘

190ARMDELAY = .0000002

GW-Basic for National Instruments PC-IIA, Setting Up the Interface 4-5

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Contents

Timer/Counter/ Analyzers Pendulum Instruments AB Sweden Table of Contents Diagnostics Subsystem Configure FunctionAbort Arming Subsystem Common Commands Sense Command SubsystemMemory Subsystem Output Subsystem Index Getting Started Index Sections Syntax Specification Form Manual ConventionsMnemonic Conventions Setting Up Instrument Setting the Gpib AddressExample Language Testing the Bus Power-onInterface Functions What can I do with the Bus? Listener Function, L4 Service Request, SR1Remote/Local, RL1 Parallel Poll, PP0 Bus Commands for the Benchtop User INPATT110 Error CodeINPLEVlevel INP2ATT110 These commands are from the Sense subsystem Systpres or *RSTACQHOFFTIMEtime ACQAPERtime FUNCfunctionchannel,channel Calcavertypemaxminsdevmean Selects statistical function SAVmemory location*RCLmemory locationMemory location can be any No. between 0 FUNCTOT1,2 All commands on this page are from the Sense subsystem OUTPSCALscaling factor SYSTCOMMGPIBADDRAddress This command is from the Sense subsystem Default settings after *RST Default settings after *RST Introduction to Scpi What is SCPI? What is SCPI?Reason for Scpi Compatibility Gpib Management and Maintenance of Programs How does Scpi Work in the Instrument? Message Exchange Control protocolHow does Scpi Work in the Instrument? Sequential and Overlapped Commands Deferred CommandsProtocol Requirements Order of Execution Definitions Remote Local Protocol Syntax and Style Program and Response MessagesSyntax of Program Messages Program and Response MessagesPage Notation Habit in Command Syntax Syntax of Response MessagesResponses Command Tree Moving down the Command TreeExample SEND→ Inputfilteron Numeric Data ParametersBoolean Data Keywords Summary Other Data Types Expression DataSEND→ Systtouton or SYSTTOUT1 #218INPIMP50SENS10 Macros Define Macro CommandMacro Names Data Types within Macros How to Execute a Macro Deleting MacrosEnabling and Disabling Macros GMC? Get Macro Contents Query Retrieve a MacroLMC? Learn Macro Query Status Reporting System IntroductionStatus Reporting System Detecting Errors in the Queue Error ReportingRead the Error/Event Queue Standardized Error Numbers Execution Error Device-specific ErrorQuery Error Reset Strategy Initialization and ResettingBus Initialization Message Exchange Initialization *CLS Command *RST Command Programming Examples Introduction Introduction GW-Basic for National Instruments PC-IIA Setting up the interface Limit Testing 180 ‘ Armdelay = 90 ‘ 100 ‘ 110 ‘ -- Enable arming, etcFrequency Profiling 50 ‘ 270 WRT$ = Armdel + STR$ARMDELAY Call IBWRTCNT%, WRT$ PRINT#1, STR$ARMDELAY, LEFT$MSG$, INSTRMSG$, CHR$10Call IBRDCNT%, MSG$ Call Ibwait CNT%, Mask Fast Sampling 600 ‘ Close 620 END 510 MSG$ = SPACE$255 180 ‘ -- SET Service Request Enable 130 ‘ -- SET Event Status Enable260 ‘ -- Enter Command String and Send to Counter Status Reporting 410 ‘ -- Check Message Available BIT While SPR% 650 ‘ -- Read Error MessagesLfpos 520 ‘ -- Check Event Status BIT Print Waiting for Measurement to GET Ready Statistics330 WRT$ = Calcavertype MAX CALCIMM? Call Ibwrt CNT%, WRT$ Call Ibrd CNT%, MSG$ Print Maximum = LEFT$MSG$, IBCNT% 470 WRT$ = Calcavertype Mean CALCIMM? Call Ibwrt CNT%, WRT$ Call Ibrd CNT%, MSG$ Print Minimum = LEFT$MSG$, IBCNT%Call Ibrd CNT%, MSG$ Print Mean = LEFT$MSG$, IBCNT% 540 WRT$ = Calcavertype Sdev CALCIMM? Call Ibwrt CNT%, WRT$ ‘C’ for National Instruments PC-IIA ‘C’ for National Instruments 14 ‘C’ for National Instruments PC-IIA, Limit Testing ‘C’ for National Instruments PC-IIA, Real Data Format Real Data Format 16 ‘C’ for National Instruments PC-IIA, Frequency Profiling FileOfp Capture Profile 17 ‘C’ for National Instruments PC-IIA, Frequency Profiling 18 ‘C’ for National Instruments PC-IIA, Fast Sampling ‘C’ for National Instruments PC-IIA, Fast Sampliing 20 ‘C’ for National Instruments PC-IIA, Statistics ‘C’ for National Instruments PC-IIA, Statistics This side is intentionally left blank 22 ‘C’ for National Instruments PC-IIA Instrument Model Function Instrument Examples Type INPut Measurement Function BlockSENSe CALCulate Order of Execution Other Subsystems MEASurement Function CONFigure READ?MEASure? MEASurement Function CONFigure INITiateFETCh? Versatility of Measurement Com- mandsREAD? Using the Subsystems Introduction Statistics MathematicsLimit Monitoring Calculate Subsystem PM6680B, PM6685 PM6681Calibration Subsystem Configure Function Configure Function Format Subsystem Time Stamp Readout Format Input Subsystems PM6685 PM6680B/PM6681 2Summary of PM6680B / PM6681 input amplifier settings MEASure? CONFigure READ?SEND→ MEASureFREQ? SEND→ MEASureFREQ?20MHz,1 CONFigureINITiateFETCh? SEND→ READ?Versatility of measurement com Mands Output Subsystem Scaling Factor Same exponent, opposite sign Resolution Switchbox Sense Command SubsystemPrescaling Status Reporting Model Using the RegistersStatus Structure Status Subsystem 7654 3210 Using the Queues Clearing/Setting all bitsStatus of the Error Message Queue EAV Using the Status Byte Selecting Summary Message to Gen Erate SRQIc e Reading and Clearing Status Setting up the Counter to Report StatusStatus Byte Status Event Registers Set up Why Two Types of Registers?Status Condition Registers Check & Action G ic a Standard Status RegistersA t u s B y t e G i s t e r Summary, Standard Event Status Reporting Standard Event Status Register SCPI-defined Status Registers Operation Status Group Summary, Operation StatusReporting Data/Signal Status Reporting Questionable Data/SignalStatus Group Summary Questionable Device-defined Status Structure Error Queue Power-on Status Clear Preset the Status Reporting StructureSummary, Device-defined Status Reporting ARM-TRIG Trigger Configuration Instrument ActionTrigger/Arming Subsystem Structure of the Idle and Initiated States Structure of an Event-detection LayerForward Traversing an Event-detection Layer When to use *TRG and GET TRG Trigger CommandTriggering Backward Traversing an Event-detection Layer E n t d e t e c t i o n l oa ny e er a c h a r m E n t d e t e c t i o n l a y e r How to Measure Fast Measurement Cycle Synchronization Controller SynchronizationStart Stop Rough Trigger SubsystemDescription Some Basic Commands MEASFREQ? CommandData Format MEASMEM1? MEASMEM?1 RCL 1READ? Initcont and GET Individually Synchronized MeasurementsBasic Measurement Method ARMSTARTLAY2SOURceBUS Block Synchronized Measurements General Speed ImprovementsREADARRay? Init + GET + FETCHARRay? Display Control Time Measurement ResolutionGpib Data Format Automatic Interpolator Calibration PM6680B/85 Ments/second MeasureBlock Measurements Real Time Calculation Obvious Method Supervising a ProcessOptimal Method Supervising a Process Speed Summary Speed SummaryDead Time Between Measurements Including Transfer to Controller Ascii Data Format Real Data Format E e d D i v i d u a l l y s y n c . m e a s Speed Improvement Actions Block Synchronized MeasurementsDead Time Between Measurements PM6680B PM6681 PM6685 Speed Calculating the Measurement Freq Timesaving Com Time Gain in ms Sacrifice Mands Single Speed Switch Command for PM6681 Single Speed Switch Command for PM6680B/85 Error Messages Error Code 0 to Read the Error/Event QueueSEND→ SYSTemERRor? READ← -100, Command Error Command Errors Error Code -105 to -120 More specific error Error Code -121 toDetect a more specific error Ular error message is used when the counter cannot Error Code -151 to -170 Error Code -171 to Error Code -200 to -221 Execution errors Error Code -222 toError message is used when the counter cannot de Tect the more specific errors described for errors Error Code -241 to -272 Error Code -273 to Header syntaxMacro label was already defined see Error Code -300 to -350 Query errors Error Code -400 to Unsupported enu Merated command Error Code 1100 to -1139Unsupported auto Command Unsupported single Shot command Reset during bus Error Code 1150 toOutput Read, but the waiting was broken by the operator Some PC controller cards has been known to do Parser error Generic error in the parser Error Code 1214 to -1240 This page is intentionally left blank Command Reference Command Reference Abort Abort Measurement ABORtPM6680B/81/85 Aborts all previous measurements if *WAI is not used Arming Subsystem No. of Measurements on each Bus arm ARM COUNt«Numeric valueMINMAX» PM6680B/81/85 Send ARMCOUN100 Delay after External Start Arming ARM DELayARM ECOunt External Events before Start Arming ARM LAYer2 SOURce ARM LAYer2Bus Arming Override Bus Arming On/Off ARM SOURce ARM SLOPeExternal Arming Start Slope External Arming Start Source Delay after External Stop Arming ARM Stop DELayARM Stop ECOunt External Events before Stop Arming ARM Stop SOURce ARM Stop SLOPeExternal Stop Arming Slope External Stop Arming Source This page is intentionally left blank Calculate Subsystem CALCulate AVERage COUNt Enable StatisticsCALCulate AVERage STATe Sample Size for Statistics Statistical Type CALCulate AVERage TypeFetch calculated data Send Calcmathstat Oncalcmath X 10.7E6INIT *OPC CALCulate IMMediate Enable Monitoring of Parameter LimitsCALCulate LIMit Recalculate Data CALCulate LIMit LOWer CALCulate LIMit FAIL?Limit Fail Set Low Limit CALCulate LIMit LOWer STATe Set Upper LimitCALCulate LIMit UPPer Check Against Lower Limit Check Against Upper Limit CALCulate LIMit UPPer STATe Select Mathematical Expression CALCulate MathExpression Sendcalcmath X 10.7E6MATHSTATE ONREAD? This example switches on mathematics Enable MathematicsCALCulate Math STATe No calculation Switches on Post Processing Enable CalculationCALCulate STATe Send Calcstat Calibration Subsystem CALibration INTerpolator Auto ‘How to Measure Fast’Calibration of Interpolator Boolean Once Set up Instrument for Measurement Configure Function Configure the counter for a single measurement CONFigure Measuring FunctionParameters,channels Send CONFFREQRAT@3,@1 Configure the counter for an array of measurements CONFigure ARRay Measuring FunctionSend Confarrper 7,5E-3,1E-6,@4 Send READARR? This page is intentionally left blank Diagnostics Subsystem Input comparator hysteresis calibration DIAGnosticCALibrationINPut12HYSTeresisSend Diagcalinphyst Once This string calibrates both input a and input B Display Subsystem Where Boolean = 1 / on 0 / OFF DISPlay ENABleSee also , ‘How to Measure Fast’ Display State Fetch Function Fetch One Result FETCh? FETCh ARRay? Fetch an Array of Results«fetch array sizeMAX» Returned format data,data Format Subsystem Response Data Type FORMat FORMat SREGister FORMat FIXedResponse Data Format Data Type for Status Messages Timestamping On/Off TimestampingOn/Off FORMat TINFormation Initiate Subsystem INITiate CONTinuous INITiateInitiate Measurement Continuously Initiated Input B Not PM6685 Input Subsystems INPut«12» ATTenuation INPut«12» COUPlingAC/DC Coupling INPut HYSTeresis INPut FILTerLow Pass Filter Sensitivity Auto Sensitivity INPut HYSTeresis Auto«BooleanONCE» Send Inphystauto OFF INPut«12» LEVel INPut«12» IMPedanceInput Impedance Fixed Trigger Level Waveform compensation INPut LEVel«Decimal dataMAXMIN» PM6685 Send Inplev 3.75LEVAUTO Autotrigger INPut LEVel AutoSend Inplevauto OFF Send INP2LEVAUTO on Autotrigger INPutAUTO? INPut«124» SLOPe INPut2COMMonTrigger Slope This page is intentionally left blank Measurement Function Set up the Instrument, Perform Measurement, and Read Data RISETIME? Tion, @1@3@4@5@6 Make one measurement MEASure Measuring Function?Parameters ,channels PM6680B/81/85 Send MEASFREQ? @3 Read 1.78112526833E+009 Make an array of measurements MEASure ARRay Measuring Function?Send MEASARRFREQ? Ten measuring results will be returned MEASureMEMoryN? Data Format CommandMEASureMEMory? Memory Recall, Measure and Fetch Result Positive Duty Cycle MEASure«DCYCle/PDUTycycle»Send MEASPDUT? Read +5.097555E-001 MEASure FREQuency? Expected value,resolution ,@«1234567» PM6680B/81/85Frequency This example measures the frequency at input C Expected value,resolution ,@«1234567» MEASure FREQuency BURSt?Burst Carrier Frequency MEASure FREQuency PRF? Pulse Repetition FrequencyExp. val.,res.,@«1234567» PM6680B/81/85 Fall-time MEASure FREQuency RATio?Frequency Ratio Send MEASFREQRAT? @1,@3 Read 2.345625764333E+000 MEASure Volt MINimum? MEASure Volt MAXimum?Positive Peak Voltage Negative Peak Voltage MEASure PWIDth? MEASure NWIDth?Negative Pulse Width Positive Pulse Width MEASure«NDUTycycle»? MEASure«PDUTycycle/ DCYCle»?Positive duty cycle Duty Factor Negative duty cycle Duty Factor Phase MEASure PHASe?MEASure PERiod? Period MEASure Rise TIME? MEASure Volt PTPeak?Peak-to-Peak Voltage Rise-time MEASure TINTerval? Time-Interval@«124»,@«124» MEASure TOTalize ACCumulated? Totalize X gated by Y, accumulatedTime for gate open,@«12456» ,@«12456» PM6680B PM6681 Totalize Manually PM6680B/81/85CONFigure TOTalize CONTinuous@«1246»,@«1246» Send CONFTOTINPSLOPe neg MEASure TOTalize SSTop? MEASure TOTalize GATed?Totalize X gated by Y Totalize X start/stop by Y MEASure TOTalize TIMed? Totalize X-Y During a Preset TimeTime for gate open ,@«124»,@«124» Send MEASTOTTIM? 1,@1,@1 This page is intentionally left blank Memory Subsystem Related Common Commands MEMory Free SENSe? MEMory DELete MACRoDelete one Macro Memory Free for results Memory States Memory Free for MacrosBytes available, Bytes used Number of states available This page is intentionally left blank Output Subsystem OUTPut Enable Analog OutOUTPut SCALe Scaling Factor, Analog Output Perform Measurement and Read Data Read Function Send Conffreqinpfilt ONREAD? Read one Result Read an array of results READARRay?«array size for FETChMAX» Send Armcoun 10READARR? This page is intentionally left blank Sense Subsystem command tree for PM6680B and PM6681 Sense Command Subsystem Sense Subsystem command tree for PM6685 Set the Measurement Time ACQuisition APERture«Decimal value MINMAX» Decimal value 10 ms ACQuisition Hoff ECOunt ACQuisition HoffHold Off On/Off Hold Off, set event counter Hold Off Mode ACQuisition Hoff ModeACQuisition Hoff Time Hold Off Time ACQuisition RESolution AVERage COUNt Average Samples«Decimal dataMIN MAX» FREQuency RANGe LOWer AVERage STATeAverage or Single? High Speed Voltage Measurements Select Measuring Function FUNCtionFunctions and channels in PM6685 Input channels PM6685 Input channels PM6680B and PM6681 Functions and channels in PM6680B and PM6681 Internal Format INTernal FORMatNumber of Results Buffer BURST/PRF Synchronization Delay SDELayROSCillator SOURce Select Reference Oscillator VOLTageGATedSTATe TOTalize GateGate On/Off Gated Voltage Measurement This page is intentionally left blank Status Subsystem Related Common Commands Enable Device Status Reporting STATus DREGister0 ENABleBit No Weight Condition STATus DREGister0? Read Operation Status Condition Register STATus OPERation CONDition? Enable Operation Status Reporting STATus OPERation ENABleSend Statoperenab 288 STATusPRESet values STATusOPERation?Read Operation Status, Event STATus QUEStionable CONDition? Read Questionable Data/Signal Condition Register Enable Questionable Data/Signal Status Reporting STATus QUEStionable ENABleRead Questionable Data/Signal Event Register STATus QUEStionable? This page is intentionally left blank System Subsystem Related common command SYSTem COMMunicate Gpib ADDRess SYSTem ERRor?Set Gpib Address Send Systcommgpibaddr Preset SYSTem PRESetSignal Detection See also Default settings on SYSTem SET Read or Send SettingsSYSTem Time ELAPsed? Read On-time Timeout, Set Timeout On/OffSYSTem Tout SYSTem Tout Time SYSTem VERSion? SYSTem UNPRotectUnprotect System Version Test Subsystem TESTCHECk Select Check signalTest SELect Select Self-tests Trigger Subsystem TRIGgerCOUNt No. of Triggerings on each Ext Arm startSend Trigcoun Common Commands Send *CLS Clear Status Command Send AMPLITUDE? Define MacroRead +3.46125461E-001+3.64852399E-001 Send Autofilt OFF Enables macro expansion and execution Enable MacrosDecimal data PM6680B/81/85 SEND*EMC Standard Event Status Enable Event Status Enable Register 1 = enableOperation Complete Get Macro Definition Event Status RegisterMacro label PM6680B/81/85 Send *GMC? ‘AMPLITUDE?’ Learn Macro Identification queryMain READAUTOFILT,AMPLITUDE? Learn Device Setup Operation CompleteSend INIT*OPC Option Identification Operation Complete QueryExample 6 is Chapter Bus option,Prescaler option This example enables automatic power-on clearing Power-on Status ClearPurge Macros Removes all macro definitions Recall Protected User Data This command removes an individual MACRo PM6680B/81/85 ResetDefault settings on ‘Macro name’ is the name of the macro you want to delete Save Decimal data = a number between 1Send *SAV Service Request Enable Register 1 = enable Service Request Enable ARMSTARtLAYer2IMM *WAIFETCh? Status Byte QuerySend ARMSTARTLAY2SOURCE BUS Send Initcont on Read +3.2770536E+004 Self Test Integer = PM6680B Error PM6681, PM6685 Er RorWait-to-continue SENDMEASFREQ? *WAIMEASPDUT? Index Auto AddressAuto calibration on/off· · · · · · · · · · · 9-24Average Average or Single? · · · · · · · · · · · · · Burst Command Error CMEBus Calculate ARMSEQuence1LAYer1ECOunt CONFigureTOTalizeACCumulated SENSeFREQuencyRANGeLOWer STATusOPERationCONDition?STATusQUEStionableCONDition? Device dependent Error DDE DelayDevice Status Register Display Execution EventsExternal Events before Start Arming Fail Limit · · · · · · · · · · · · · · · · · · · · · · · Initiated state · · · · · · · · · · · · · · · · · 6-28Input Hysteresis · · · · · · · · · · · · · · · · · · · · Measuring Lower Limit Operation Status Monitor QUE · · · · · · · · · · · · · · · · · 9-130 9-131Query PulseResponse Result Set SettingsStop arming · · · · · · · · · · · · · · · · · 9-11Source Speed Test TimeTime out For measurement TIO · · · · · · · 6-24Timebase Upper Limit See Also Command *TRG

Fluke PM6681R, PM6685R Frequency Profiling, 50 ‘, Open O, 1, PROFILE.DAT, 180 ‘ Armdelay =

Models: PM6685 PM6685R PM6681 PM6681R