Configuring for High Accuracy Measurements | HP WaterSkis E1312A

Configuring for High Accuracy Measurements

The measurement configurations shown below assume that the multimeter is in its power-on or reset state. It is also assumed that manual ranging is enabled to ensure proper full scale range selection.

DC Voltage, DC Current, and Resistance Measurements:

•Set the resolution to 6 digits Fast (integration time of 10 PLC). You can use the 6 digits slow mode (integration time of 100 PLC) for further noise reduction.

•Set the input resistance to greater than 10GΩ (for the 100mV, 1V, and 10V ranges) for the best dc voltage accuracy.

•Use 4-wire ohms for the best resistance accuracy.

•Use Math Null to null the test cable resistance for 2-wire ohms, and to remove interconnection offset for dc voltage measurements.

AC Voltage and AC Current Measurements:

•

•

Set the resolution to 6 digits (integration time of 100 PLC).

Select the slow ac filter (3Hz to 300kHz).

Frequency and Period Measurements:

•Set the resolution to 6 digits (aperture time of 1 second).

184 HP E1312A and HP E1412A Multimeter Specifications

Appendix A

Image 184

HP WaterSkis E1312A manual Configuring for High Accuracy Measurements, DC Voltage, DC Current, and Resistance Measurements

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 HP E1312A and HP E1412A Multimeter Module Setup Using This Chapter Setting the Module Address Switch Interrupt Priority Setting the Line Frequency ReferenceChecking the Line Frequency Reference Page Switch Module Analog Bus Connections Multimeter Functional Connections Voltage Measurement Connections Wire Ohms Measurement Connections HP E1312A and HP E1412A Multimeter Module Setup Chapter Initial Operation Function Prototype HP E1312A and HP E1412A Multimeter Module Setup Chapter Measurement Tutorial Thermal EMF ErrorsDC Voltage Measurements Loading Errors dc volts Leakage Current Errors Thermoelectric Voltages Rejecting Power Line Noise Voltages Common Mode Rejection CMR Noise Caused by Magnetic Loops Noise Caused by Ground Loops Wire Ohms Measurements Resistance Measurements Set to 2-wire ohms function Errors in High Resistance Measurements Power Dissipation EffectsMaking High-Speed DC and Resistance Measurements DC Current Measurement Errors True RMS AC Measurements Crest Factor Errors non-sinusoidal inputs Common Crest Factors Example Loading Errors ac volts Temperature Coefficient ErrorsAC Measurements Below Full Scale Function and Range Change Internal Offset Correction Low-Level Measurement Errors Voltage Measured = Vin2+ Noise2 Frequency and Period Measurement Errors AC Current Measurement ErrorsMaking High-Speed AC Voltage or Current Measurements Measurement Configuration AC Signal Filter DC Input Resistance Number of Power Line Cycles Nplc Resolution Chapter HP E1312A/E1412A Multimeter Application Information SENSeZEROAUTO Offonceon Math Operations CALCulate Subsystem Null Relative Function DB Measurements CONFfunction Storing the dB Reference Value DBm MeasurementsStoring the dBm Reference Resistance Value HP E1312A/E1412A Multimeter Application Information Chapter Triggering the Multimeter TRIGgerSOURce EXTernal Checking the Trigger Source Bus Triggering Wait-for-Trigger State Example Setting the Trigger Count Checking the Trigger Count Inserting a Trigger DelayExample Inserting a Trigger Delay Default Trigger Delays Example Setting the Sample Count Querying Delay Time Sample CountChecking the Sample Count HP E1312A and HP E1412A Multimeter Application Examples HP VTL Software Visa MEASure Command Making Multimeter Measurements MEASURE1 Source Code File MEASURE2 Source Code File MEASURE3 Source Code File Init MEASURE4 Source Code File Synchronizing Multimeter With a Switch Module HP E1412A Multimeter and Switch Module Synchronization See -5 for the HP E1312A/E1412A Multimeter status system Set up the Multimeter Now set up the switch moduleCheck the multimeter for system errors Retrieve the readings from the multimeter Multimeter Status System Examples Synchopc Source Code File RST CLS *ESE Init OPC Synchmav Source Code File RST Init FETC? Limittst Source Code File End Loop Check the multimeter for system errorsLoop Device Configuration Programming ExamplePage HP E1312A/E1412A Multimeter Application Information Chapter Common Command Format Command TypesCommand Format Abbreviated Commands Implied Commands CommandSeparator Linking Commands Parameters Multimeter Range and Resolution Tables PLC AC Voltage Range versus Resolution Scpi Command ReferenceAC Current Range versus Resolution ABORt Related Commands INITiate, TRIGgerAborting a Measurement Subsystem Syntax CALCulateValid Math/Measurement Function Combinations AVERageAVERage? AVERageCOUNt?AVERageMAXimum? AVERageMINimum? DBREFerence DBREFerence?DBMREFerence DBMREFerence? FUNCtion FUNCtion?Parameter Summary Example Example Query the Calculate Math Function LIMitLOWer LIMitLOWer?LIMitUPPer LIMitUPPer? NULLOFFSet NULLOFFSet?STATe STATe? CALibration COUNt?LFRequency Comments Example Query the Line Frequency Setting LFRequency?SECureCODE Example Enter a New Calibration Security Code SECureSTATe SECureSTATe?STRing Example Set the Calibration State to Unsecured STRing? VALueVALue? Example Query the Calibration Message Zeroauto CALibration? CAL? CONFigure Command Setting Default Settings for CONFigure Command by Function Function Range Resolution CURRentAC Example Making AC Current Measurements CURRentDC Example Making DC Current Measurements ResolutionMINMAXDEF selects the frequency function Example Making 4-Wire Ohms Measurements FRESistance PERiod Resolution Minmaxdef Example Making 2-Wire Ohms Measurements VOLTageAC Example Making AC Voltage Measurements VOLTageDC Example Making DC Voltage Measurements VOLTageDCRATio Sense HI and LO input CONFigure? String Returned Data POINts? FETCh? Example Transferring Stored Readings to Output Buffer IMMediate INITiateExample Placing Multimeter in Wait-For-Trigger State Example Query the Input Impedance Mode INPutIMPedanceAUTO IMPedanceAUTO? MEASure CURRentAC? MEASCURRAC? 1,MAX CURRentDC? MEASCURRDC? .1,MAX FREQuency? FRESistance? MEASFRES? 1500,MAX PERiod? RESistance? VOLTageAC? VOLTageDC? VOLTageDCRATio? Example Making DC Voltage Ratio Measurements TTLTrgSTATe OUTPutRST Condition OUTPTTLTn OFF Example Route Voltmeter Complete to Trigger Line TTLTrgSTATe?Example Query Voltmeter Complete Destination READ? Example Transfer Readings Directly to Output Buffer COUNt SAMPleRST Condition Sampcoun Example Set the Sample Count Example Query the Sample Count SAMPCOUN? SENSe Zero Auto Offonceon AUTO? Example Query the Measurement Function Function CURRentACRANGe? CURRentACRANGeExample Query the AC Current Measurement Range Example Disable AC Current Autoranging Example Query the AC Current Autorange ModeCURRentACRANGeAUTO CURRentACRANGeAUTO? CURRentACRESolution CURRentACRESolution? CURRentDCAPERture CURRentDCAPERture?Example Set an Aperture Time of 16.7ms Example Query the Aperture Time CURRentDCNPLC? CURRentDCNPLCExample Query the DC Current Integration Time CURRentDCRANGe CURRentDCRANGe?Example Set the DC Current Range to 3A Example Query the DC Current Measurement Range Example Disable DC Current Autoranging Example Query the DC Current Autorange ModeCURRentDCRANGeAUTO CURRentDCRANGeAUTO? CURRentDCRESolution CURRentDCRESolution? DETectorBANDwidth DETectorBANDwidth? FREQuencyAPERtureFREQuencyAPERture? Example Query the Detector Bandwidth FREQuencyVOLTageRANGe FREQuencyVOLTageRANGe?Example Set the Voltage Range for Frequency Measurements to Example Query the Measurement Range Example Disable Autoranging Example Query the Autorange ModeFREQuencyVOLTageRANGeAUTO FREQuencyVOLTageRANGeAUTO? FRESistanceAPERture FRESistanceAPERture? FRESistanceNPLC? FRESistanceNPLCExample Query the Integration Time FRESistanceRANGe FRESistanceRANGe? FRESistanceRANGeAUTO FRESistanceRANGeAUTO? FRESistanceRESolution FRESistanceRESolution?Example Query the Resolution RST Condition Fresres 1mΩ 1E-03 PERiodAPERture? PERiodAPERtureRST Condition 0.1 100ms Example Set the Aperture Time PERiodVOLTageRANGe PERiodVOLTageRANGe?Example Set the Voltage Range for Period Measurements to Example Query the Period Voltage Range PERiodVOLTageRANGeAUTO PERiodVOLTageRANGeAUTO? RESistanceAPERture RESistanceAPERture? RESistanceNPLC RESistanceNPLC? RESistanceRANGe? RESistanceRANGeRST Condition Resrang 1kΩ Example Change the Range RESistanceRANGeAUTO RESistanceRANGeAUTO? RESistanceRESolution? RESistanceRESolutionExample Change the Resolution VOLTageACRANGe VOLTageACRANGe? VOLTageACRANGeAUTO Example Disable AC Voltage AutorangingVOLTageACRANGeAUTO? VOLTageACRESolution? VOLTageACRESolutionRST Condition 1E-04 Example Change the Resolution VOLTageDCAPERture VOLTageDCAPERture? VOLTageDCNPLC VOLTageDCNPLC? VOLTageDCRANGe VOLTageDCRANGe? VOLTageDCRANGeAUTO VOLTageDCRANGeAUTO? VOLTageDCRESolution VOLTageDCRESolution? Example Disable Autozero Example Query the Autozero Mode PRESet QUEStionableENABleSTATus QUEStionableCONDition? QUEStionableENABle? QUEStionableEVENt? ERRor? Example Reading the Error QueueSYSTem VERSion? TRIGger RST Condition Trigcoun Example Set the Trigger Count Example Set the Trigger Delay DELayExample Query the Trigger Count DELay? DELayAUTOExample Query the Trigger Delay Example Disable Automatic Trigger Delay DELayAUTO? Example Query the Trigger Delay Mode SOURce Related Commands INITiate, READ?, MEAS?Example Set the Sample Source SOURce? Example Query the Trigger Source Ieee 488.2 Common Command Quick Reference Category Command Title Description Example Enable All Error Events ESE and *ESE? ESR? SRE and *SRE? RST does not affect STB? Scpi Command Quick Reference HP E1412A C-size 6½-Digit Multimeters Data 67sMINMAX Zeroauto Offonceon HP E1312A and HP E1412A Multimeter Specifications DC Characteristics Measuring Characteristics 60 Hz 50 Hz Operating Characteristics AC Characteristics True RMS AC True RMS AC Voltage System Speeds 10 Frequency and Period Characteristics Accuracy Specifications ±% of reading 1 Configuration Rates 14/sec Autorange Time General Specifications To Calculate Total Measurement Error Understanding the % of reading Error Total Measurement Error Interpreting Multimeter Specifications Number of Digits and Overrange Accuracy Configuring for High Accuracy Measurements DC Voltage, DC Current, and Resistance Measurements Execution Errors 112Program mnemonic too long 113Undefined header121Invalid character in number 123Numeric overflow To -168Block data errors To -178Expression errors221Settings conflict 211Trigger ignored 330Self-test failed 350Too many errors440Query Unterminated after indefinite response Cannot achieve requested resolution Cannot use overload as math reference Cal signal measurement out of range Cal signal frequency 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 General Guidelines for Increasing Measurement Speed Minimize Number Command Response SessionsAvoid Function Changes Avoid Aperture Changes Set Autozero to Once or OFF Turn Autorange Decrease Aperture Time or NPLCs Setting the Resolution INITFETCH? 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