Triggering the Multimeter | HP WaterSkis E1412A, WaterSkis E1312A

Triggering the Multimeter

This section discusses the multimeter’s trigger system and outlines the different triggering configurations and programming methods used to control the trigger system. Keep in mind that you do not have to program the trigger system to make measurements. You can avoid having to learn the information in this section by using the default trigger configuration set by MEASure and CONFigure commands. However, you will need the information in this section to take advantage of the flexibility of the

HP E1312A/E1412A trigger system when using the CONFigure command.

The multimeter’s trigger system synchronizes measurements with specified internal or external events. These events include software trigger commands, negative-going edges on the VXIbus trigger lines (TTLT0 - TTLT7), and negative-going pulses on the multimeter's external trigger (“Trig”) BNC connector. The trigger system also allows you to specify the number of triggers that will be accepted, the number of readings per trigger (sample count), and the delay between the trigger and each reading.

Figure 2-1 illustrates the multimeter's trigger system and the programming commands that control the trigger system. The multimeter operates in one of two trigger states. When you are configuring the multimeter for measurements, the multimeter must be in the idle state. After configuring the multimeter, the multimeter must be placed in the wait-for-triggerstate.

Figure 2-1. Multimeter Triggering Flow Chart

Chapter 2

HP E1312A/E1412A Multimeter Application Information 45

Image 45

HP WaterSkis E1412A, WaterSkis E1312A manual Triggering the Multimeter

Contents

Contents Frequency and Period Measurement Errors Zeroauto ZEROAUTO? IMMediate Chapter Multimeter Command Reference Appendix a Appendix B Contents HEWLETT-PACKARD Warranty Statement Documentation History Manufacturer’s Name July 31 Jim White, QA Manager Business Reply Mail Page Using This Chapter HP E1312A and HP E1412A Multimeter Module Setup Setting the Module Address Switch Setting the Line Frequency Reference Interrupt PriorityChecking the Line Frequency Reference Page Multimeter Functional Connections Switch Module Analog Bus Connections Voltage Measurement Connections Wire Ohms Measurement Connections Initial Operation HP E1312A and HP E1412A Multimeter Module Setup Chapter Function Prototype HP E1312A and HP E1412A Multimeter Module Setup Chapter Thermal EMF Errors Measurement TutorialDC Voltage Measurements Thermoelectric Voltages Loading Errors dc volts Leakage Current Errors Common Mode Rejection CMR Rejecting Power Line Noise Voltages Noise Caused by Ground Loops Noise Caused by Magnetic Loops Resistance Measurements Wire Ohms Measurements Set to 2-wire ohms function Power Dissipation Effects Errors in High Resistance MeasurementsMaking High-Speed DC and Resistance Measurements True RMS AC Measurements DC Current Measurement Errors Common Crest Factors Example Crest Factor Errors non-sinusoidal inputs Temperature Coefficient Errors Loading Errors ac voltsAC Measurements Below Full Scale Function and Range Change Internal Offset Correction Voltage Measured = Vin2+ Noise2 Low-Level Measurement Errors AC Current Measurement Errors Frequency and Period Measurement ErrorsMaking High-Speed AC Voltage or Current Measurements AC Signal Filter DC Input Resistance Measurement Configuration Number of Power Line Cycles Nplc Resolution Chapter HP E1312A/E1412A Multimeter Application Information SENSeZEROAUTO Offonceon Null Relative Function Math Operations CALCulate Subsystem CONFfunction DB Measurements DBm Measurements Storing the dB Reference ValueStoring the dBm Reference Resistance Value HP E1312A/E1412A Multimeter Application Information Chapter Triggering the Multimeter TRIGgerSOURce EXTernal Checking the Trigger Source Wait-for-Trigger State Bus Triggering Checking the Trigger Count Inserting a Trigger Delay Example Setting the Trigger CountExample Inserting a Trigger Delay Default Trigger Delays Querying Delay Time Sample Count Example Setting the Sample CountChecking the Sample Count HP VTL Software Visa HP E1312A and HP E1412A Multimeter Application Examples Making Multimeter Measurements MEASure Command MEASURE2 Source Code File MEASURE1 Source Code File Init MEASURE3 Source Code File MEASURE4 Source Code File HP E1412A Multimeter and Switch Module Synchronization Synchronizing Multimeter With a Switch Module See -5 for the HP E1312A/E1412A Multimeter status system Now set up the switch module Set up the MultimeterCheck the multimeter for system errors Retrieve the readings from the multimeter Multimeter Status System Examples RST CLS *ESE Init OPC Synchopc Source Code File RST Init FETC? Synchmav Source Code File End Loop Check the multimeter for system errors Limittst Source Code FileLoop Programming Example Device ConfigurationPage HP E1312A/E1412A Multimeter Application Information Chapter Command Types Common Command FormatCommand Format Command Abbreviated Commands Implied CommandsSeparator Parameters Linking Commands PLC Multimeter Range and Resolution Tables Scpi Command Reference AC Voltage Range versus ResolutionAC Current Range versus Resolution Related Commands INITiate, TRIGger ABORtAborting a Measurement CALCulate Subsystem SyntaxValid Math/Measurement Function Combinations AVERageCOUNt? AVERageAVERage?AVERageMAXimum? AVERageMINimum? DBREFerence? DBREFerenceDBMREFerence DBMREFerence? FUNCtion? FUNCtionParameter Summary Example Example Query the Calculate Math Function LIMitLOWer? LIMitLOWerLIMitUPPer LIMitUPPer? NULLOFFSet? NULLOFFSetSTATe STATe? COUNt? CALibrationLFRequency Comments LFRequency? Example Query the Line Frequency SettingSECureCODE Example Enter a New Calibration Security Code SECureSTATe? SECureSTATeSTRing Example Set the Calibration State to Unsecured VALue STRing?VALue? Example Query the Calibration Message Zeroauto CAL? CALibration? Command Setting CONFigure Function Range Resolution Default Settings for CONFigure Command by Function Example Making AC Current Measurements CURRentAC Example Making DC Current Measurements CURRentDC ResolutionMINMAXDEF selects the frequency function FRESistance Example Making 4-Wire Ohms Measurements PERiod Example Making 2-Wire Ohms Measurements Resolution Minmaxdef Example Making AC Voltage Measurements VOLTageAC Example Making DC Voltage Measurements VOLTageDC Sense HI and LO input VOLTageDCRATio String Returned CONFigure? POINts? Data Example Transferring Stored Readings to Output Buffer FETCh? INITiate IMMediateExample Placing Multimeter in Wait-For-Trigger State INPut Example Query the Input Impedance ModeIMPedanceAUTO IMPedanceAUTO? MEASure MEASCURRAC? 1,MAX CURRentAC? MEASCURRDC? .1,MAX CURRentDC? FREQuency? MEASFRES? 1500,MAX FRESistance? PERiod? RESistance? VOLTageAC? VOLTageDC? Example Making DC Voltage Ratio Measurements VOLTageDCRATio? OUTPut TTLTrgSTATeRST Condition OUTPTTLTn OFF TTLTrgSTATe? Example Route Voltmeter Complete to Trigger LineExample Query Voltmeter Complete Destination Example Transfer Readings Directly to Output Buffer READ? SAMPle COUNtRST Condition Sampcoun Example Set the Sample Count SAMPCOUN? Example Query the Sample Count SENSe Zero Auto Offonceon AUTO? Function Example Query the Measurement Function CURRentACRANGe CURRentACRANGe?Example Query the AC Current Measurement Range Example Query the AC Current Autorange Mode Example Disable AC Current AutorangingCURRentACRANGeAUTO CURRentACRANGeAUTO? CURRentACRESolution? CURRentACRESolution CURRentDCAPERture? CURRentDCAPERtureExample Set an Aperture Time of 16.7ms Example Query the Aperture Time CURRentDCNPLC CURRentDCNPLC?Example Query the DC Current Integration Time CURRentDCRANGe? CURRentDCRANGeExample Set the DC Current Range to 3A Example Query the DC Current Measurement Range Example Query the DC Current Autorange Mode Example Disable DC Current AutorangingCURRentDCRANGeAUTO CURRentDCRANGeAUTO? CURRentDCRESolution? CURRentDCRESolution DETectorBANDwidth FREQuencyAPERture DETectorBANDwidth?FREQuencyAPERture? Example Query the Detector Bandwidth FREQuencyVOLTageRANGe? FREQuencyVOLTageRANGeExample Set the Voltage Range for Frequency Measurements to Example Query the Measurement Range Example Query the Autorange Mode Example Disable AutorangingFREQuencyVOLTageRANGeAUTO FREQuencyVOLTageRANGeAUTO? FRESistanceAPERture? FRESistanceAPERture FRESistanceNPLC FRESistanceNPLC?Example Query the Integration Time FRESistanceRANGe? FRESistanceRANGe FRESistanceRANGeAUTO? FRESistanceRANGeAUTO FRESistanceRESolution? FRESistanceRESolutionExample Query the Resolution RST Condition Fresres 1mΩ 1E-03 PERiodAPERture PERiodAPERture?RST Condition 0.1 100ms Example Set the Aperture Time PERiodVOLTageRANGe? PERiodVOLTageRANGeExample Set the Voltage Range for Period Measurements to Example Query the Period Voltage Range PERiodVOLTageRANGeAUTO? PERiodVOLTageRANGeAUTO RESistanceAPERture? RESistanceAPERture RESistanceNPLC? RESistanceNPLC RESistanceRANGe RESistanceRANGe?RST Condition Resrang 1kΩ Example Change the Range RESistanceRANGeAUTO? RESistanceRANGeAUTO RESistanceRESolution RESistanceRESolution?Example Change the Resolution VOLTageACRANGe? VOLTageACRANGe Example Disable AC Voltage Autoranging VOLTageACRANGeAUTOVOLTageACRANGeAUTO? VOLTageACRESolution VOLTageACRESolution?RST Condition 1E-04 Example Change the Resolution VOLTageDCAPERture? VOLTageDCAPERture VOLTageDCNPLC? VOLTageDCNPLC VOLTageDCRANGe? VOLTageDCRANGe VOLTageDCRANGeAUTO? VOLTageDCRANGeAUTO VOLTageDCRESolution? VOLTageDCRESolution Example Query the Autozero Mode Example Disable Autozero QUEStionableENABle PRESetSTATus QUEStionableCONDition? QUEStionableEVENt? QUEStionableENABle? Example Reading the Error Queue ERRor?SYSTem VERSion? RST Condition Trigcoun Example Set the Trigger Count TRIGger DELay Example Set the Trigger DelayExample Query the Trigger Count DELayAUTO DELay?Example Query the Trigger Delay Example Disable Automatic Trigger Delay Example Query the Trigger Delay Mode DELayAUTO? Related Commands INITiate, READ?, MEAS? SOURceExample Set the Sample Source Example Query the Trigger Source SOURce? Category Command Title Description Ieee 488.2 Common Command Quick Reference ESE and *ESE? Example Enable All Error Events ESR? RST does not affect SRE and *SRE? STB? HP E1412A C-size 6½-Digit Multimeters Scpi Command Quick Reference Data 67sMINMAX Zeroauto Offonceon DC Characteristics HP E1312A and HP E1412A Multimeter Specifications 60 Hz 50 Hz Measuring Characteristics Operating Characteristics True RMS AC AC Characteristics True RMS AC Voltage System Speeds 10 Accuracy Specifications ±% of reading 1 Frequency and Period Characteristics Configuration Rates 14/sec Autorange Time General Specifications Understanding the % of reading Error To Calculate Total Measurement Error Total Measurement Error Number of Digits and Overrange Interpreting Multimeter Specifications Accuracy DC Voltage, DC Current, and Resistance Measurements Configuring for High Accuracy Measurements Execution Errors 113Undefined header 112Program mnemonic too long121Invalid character in number 123Numeric overflow To -178Expression errors To -168Block data errors221Settings conflict 211Trigger ignored 350Too many errors 330Self-test failed440Query Unterminated after indefinite response Cannot use overload as math reference Cannot achieve requested resolution Cal signal frequency out of range Cal signal measurement out of rangeCal secured Invalid secure code No cal for this function or range HP E1312A and HP E1412A Multimeter Error Messages Appendix B Measurement Speed and Accuracy Trade-offs Measurement Speed and Accuracy Trade-offs Appendix C HP E1312A/E1412 Special Function Minimize Number Command Response Sessions General Guidelines for Increasing Measurement SpeedAvoid Function Changes Avoid Aperture Changes Decrease Aperture Time or NPLCs Set Autozero to Once or OFF Turn Autorange INITFETCH? Setting the Resolution Index 197 Index 124 Index Index Error, 180 See online help Cycles, 27, 38, 123, 132, 140 Errors 130 Setting resolution, 15, 38 160 Index