LFRequency?, SECureCODE | HP WaterSkis E1312A, WaterSkis E1412A

:LFRequency?

CALibration:LFRequency? queries the line frequency setting.

Comments This command returns +50 for line frequency set to 400 because 400 is an even multiple of 50.

Example Query the Line Frequency Setting

CAL:LFR?

Query the line frequency.

:SECure:CODE

CALibration:SECure:CODE <new code> enters a new calibration security code. To change the security code, first unsecure the multimeter using the old security code with CAL:SEC:STAT OFF, <old code>. Then, enter the new code. The calibration security code may contain up to 12 characters. The security code is stored in non-volatile memory.

Comments • The security code is set to “ HP_E1412” for C-size (or “ HP_E1312” for B-size) when the multimeter is shipped from the factory. The security code is stored in non-volatile memory, and does not change when power has been off or after a remote interface reset.

•The security code <new code> can contain up to 12 alphanumeric characters. The first character must be a letter. The remaining characters can be letters or numbers or an underscore. You do not have to use all 12 characters but the first character must be a letter.

•If you forget or lose the active security code, you can disable the security feature by adding a jumper inside the multimeter (see Chapter 5 in the Service Manual). You then enter a new code and remove the jumper.

Example Enter a New Calibration Security Code

CAL:SEC:STAT OFF, HP_E1412	Unsecure with the old code.
CAL:SEC:CODE the_new_code	Enter a new calibration code
	(a maximum of 12 characters).

80 Multimeter Command Reference

Chapter 3

Image 80

HP WaterSkis E1312A, WaterSkis E1412A manual LFRequency?, SECureCODE, Example Query the Line Frequency Setting

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 Checking the Line Frequency Reference Setting the Line Frequency ReferenceInterrupt Priority 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 DC Voltage Measurements Thermal EMF ErrorsMeasurement Tutorial 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 Making High-Speed DC and Resistance Measurements Power Dissipation EffectsErrors in High 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 Making High-Speed AC Voltage or Current Measurements AC Current Measurement ErrorsFrequency and Period Measurement Errors 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 dBm Reference Resistance Value DBm MeasurementsStoring the dB Reference Value HP E1312A/E1412A Multimeter Application Information Chapter Triggering the Multimeter TRIGgerSOURce EXTernal Checking the Trigger Source Bus Triggering Wait-for-Trigger State Example Inserting a Trigger Delay Checking the Trigger Count Inserting a Trigger DelayExample Setting the Trigger Count Default Trigger Delays Checking the Sample Count Querying Delay Time Sample CountExample Setting 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? Loop End Loop Check the multimeter for system errorsLimittst Source Code File Device Configuration Programming ExamplePage HP E1312A/E1412A Multimeter Application Information Chapter Command Format Command TypesCommon Command Format Separator CommandAbbreviated Commands Implied Commands Linking Commands Parameters Multimeter Range and Resolution Tables PLC AC Current Range versus Resolution Scpi Command ReferenceAC Voltage Range versus Resolution Aborting a Measurement Related Commands INITiate, TRIGgerABORt Valid Math/Measurement Function Combinations CALCulateSubsystem Syntax 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 Example Placing Multimeter in Wait-For-Trigger State INITiateIMMediate 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 RST Condition OUTPTTLTn OFF OUTPutTTLTrgSTATe Example Query Voltmeter Complete Destination TTLTrgSTATe?Example Route Voltmeter Complete to Trigger Line READ? Example Transfer Readings Directly to Output Buffer RST Condition Sampcoun Example Set the Sample Count SAMPleCOUNt Example Query the Sample Count SAMPCOUN? SENSe Zero Auto Offonceon AUTO? Example Query the Measurement Function Function Example Query the AC Current Measurement Range CURRentACRANGeCURRentACRANGe? 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 Example Query the DC Current Integration Time CURRentDCNPLCCURRentDCNPLC? 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? Example Query the Integration Time FRESistanceNPLCFRESistanceNPLC? FRESistanceRANGe FRESistanceRANGe? FRESistanceRANGeAUTO FRESistanceRANGeAUTO? FRESistanceRESolution FRESistanceRESolution?Example Query the Resolution RST Condition Fresres 1mΩ 1E-03 RST Condition 0.1 100ms Example Set the Aperture Time PERiodAPERturePERiodAPERture? PERiodVOLTageRANGe PERiodVOLTageRANGe?Example Set the Voltage Range for Period Measurements to Example Query the Period Voltage Range PERiodVOLTageRANGeAUTO PERiodVOLTageRANGeAUTO? RESistanceAPERture RESistanceAPERture? RESistanceNPLC RESistanceNPLC? RST Condition Resrang 1kΩ Example Change the Range RESistanceRANGeRESistanceRANGe? RESistanceRANGeAUTO RESistanceRANGeAUTO? Example Change the Resolution RESistanceRESolutionRESistanceRESolution? VOLTageACRANGe VOLTageACRANGe? VOLTageACRANGeAUTO? Example Disable AC Voltage AutorangingVOLTageACRANGeAUTO RST Condition 1E-04 Example Change the Resolution VOLTageACRESolutionVOLTageACRESolution? 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 Query the Trigger Count DELayExample Set the Trigger Delay DELay? DELayAUTOExample Query the Trigger Delay Example Disable Automatic Trigger Delay DELayAUTO? Example Query the Trigger Delay Mode Example Set the Sample Source Related Commands INITiate, READ?, MEAS?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 440Query Unterminated after indefinite response 350Too many errors330Self-test failed 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 Avoid Function Changes Avoid Aperture Changes Minimize Number Command Response SessionsGeneral Guidelines for Increasing Measurement Speed 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