Agilent Technologies N3280A Load Effect Tests, Voltage Priority, Constant Voltage Load Effect

Page 89

Performance and Calibration Procedures

Load Effect Tests

The following tests verify the dc regulation of the output voltage and current. To insure that the values read are truly dc and not affected by output ripple, several dc measurements should be made and the average of these readings calculated. An example of how to do this is given below using an Agilent 3458A System Voltmeter programmed from the front panel. Set up the voltmeter and execute the "Average Reading" program follows:

a.Program 10 power line cycles per sample by pressing NPLC 1 0 ENTER .

b.Program 100 samples per trigger by pressing (N Rdgs/Trig) 1 0 0 ENTER .

c.Set up voltmeter to take measurements in the statistical mode as follows: Press Shift key, f0, Shift key, N

Press ^ (up arrow) until MATH function is selected, then press >. Press ^ (up arrow until STAT function is selected then press (ENTER).

d.Set up voltmeter to read the average of the measurements as follows: Press Shift key, f1, Shift key, N.

Press down arrow until RMATH function is selected, then press >. Press ^ (up arrow) until MEAN function is selected, then press ENTER.

e.Execute the program by pressing f0, ENTER, TRIG, ENTER

f.Wait for 100 readings and then read the average measurement by pressing f1, ENTER. To repeat the measurement, perform steps (e) and (f).

Voltage Priority, Constant Voltage Load Effect

This test measures the change in output voltage resulting from a change in output current from about zero amps to about 0.5 amps.

Action

1.Turn off the dc source and connect the output as shown in Figure B-1b with the DMM across the HI and LO sense terminals. Connect the 20 ohm load resistor and switch across the HI and LO output terminals.

2.Start with the load disconnected (switch open). Turn on the dc source, program the output voltage to the full-scale value (10.0V), and the current limit to the maximum value (0.5125A).

3.Set the DVM to the 10V range, and record the output voltage reading. (zero-load value)

4.Connect the 20 ohm load resistor across the output (close the switch). Keep the DVM connected.

6.Read back the N3280A status to be sure that it’s in the CV mode. This query should return a Bit value of “1” for CV mode.

If it is not in CV mode, use a slightly higher value resistor so that the output current drops slightly.

7.Record the output voltage reading on the DVM. (full-load value)

The difference between these two DVM readings is the Load Effect voltage and should be within the limits listed in the performance test record card under Voltage Priority Load Effect Voltage.

Program Commands

“*RST”

“OUTP ON,(@1)” “VOLT 10,(@1)” “CURR:LIM 0.5125,(@1)”

“STAT:OPER:COND? (@1)”

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Contents Agilent Technologies Model N3280A Component Test DC Source USER’S GuideCertification Warranty InformationGeneral Safety SummarySafety Symbols Declaration Printing History Acoustic Noise InformationTable of Contents Scpi Command Completion Using Device Clear Types of Scpi CommandsExternal References Gpib Capabilities of the DC Source Introduction to ScpiMeasurement Commands Scpi Programming Commands At a Glance Calibration CommandsOutput Commands Status CommandsTrigger Commands System CommandsCommon Commands Voltage Priority TestsTransient Response Tests Error Number List 103Ripple and Noise Tests Page Document Orientation Safety ConsiderationsDescription Options and AccessoriesRemote Programming Option DescriptionVoltage Priority Operation Output CharacteristicsCurrent Priority Operation Output Characteristic Current PriorityMeasurement Characteristics Start of a Measurement Inspection CleaningDamage Packaging Material Additional ItemsBench Operation LocationRack Mounting Do not block the fan exhaust at the rear of the unitConnect the Power Cord Power ConnectionsOutputs 1 Turn the unit off before connecting any wiresOutput Connections Voltage Drops and Lead Resistance Current RatingsAmpacity and Resistance of Stranded Copper Conductors AWG No Maximum Ampacity Resistance at 20 deg. C Free airGuard Connections for Test Fixtures Coaxial Guard ConnectionsComputer Connections External Trigger ConnectionsMaintaining Stability OVP ConsiderationsSwitch Setting Settings for Power Module Configuration SwitchSwitch Setting Address Gpib AddressFront Panel Description Explanation Checkout ProcedureProcedure Runtime Error Messages Selftest Error MessagesPower-On Selftest Errors Case of TroublePage Gpib Capabilities of the DC Source External ReferencesGpib References Scpi ReferencesConventions Used in This Guide Types of Scpi CommandsIntroduction to Scpi Including Common Commands Multiple Commands in a MessageUsing Queries Moving Among SubsystemsChannel List Parameter Types of Scpi MessagesMessage Unit Scpi Data Formats Suffixes and Multipliers Scpi Command CompletionResponse Data Types Class Suffix Unit Unit with MultiplierOutputstate Example Using Device ClearPage Introduction Power-on InitializationProgramming the Output Enabling the OutputOutput Current Output ModeOvervoltage Protection Output Trigger Model Triggering Output ChangesOscillation Protection Selecting the Output Trigger Source Setting the Voltage and Current Trigger LevelsEnabling the Output Trigger System Average Measurements Making MeasurementsGenerating Output Triggers Measurement Samples and Time Interval Power Line CyclesCurrent Ranges Triggered MeasurementsWindow Functions Returning All Measurement Data From the Data BufferSelecting the Measurement Trigger Source Measurement Trigger ModelEnabling the Measurement Trigger System Generating Measurement Triggers Output Settling DelaySelecting the Sensing Function Pre-trigger and Post-trigger Acquisition Pre-trigger and Post-trigger Data AcquisitionDC Source Status Model Programming the Status RegistersOperation Status Group Bit Configurations of Status RegistersStandard Event Status Group Questionable Status GroupStatus Byte Register MSS and RQS BitsServicing Operation Status and Questionable Status Events Determining the Cause of a Service InterruptProgramming Parameters Subsystem CommandsCommon Commands Save new cal constants in non-volatile memory Scpi Programming Commands At a GlanceSubsystem Commands Syntax FUNCtion Mode mode, @list VOLTage Mode mode, @list DELaySets the output voltage in voltage priority mode Sets the triggered output voltage in voltage priority modeESE n Common Commands SyntaxSRE n Output Programming ParametersCALibrateCURRent Calibration CommandsCALibrateCURRentLIMitPOSitive CALibrateCURRentLIMitNEGative CALibrateCURRentMEASureCALibrateDATA CALibratePASSwordCALibrateDATE CALibrateLEVelCALibrateVOLTage CALibrateSAVECALibrateSTATe FETChARRayCURRent? FETChARRayVOLTage? Measurement CommandsFETChCURRent? FETChVOLTage? Query SyntaxMEASureCURRent? MEASureVOLTage? MEASureARRayCURRent? MEASureARRayVOLTage?SENSeCURRentRANGe Enter values greater than 0.015ASENSeSWEepNPLCycles SENSeFUNCtionSENSeSWEepOFFSetPOINts Query Syntax SENSeFUNCtion? @channel listSENSeWINDow SENSeSWEepPOINtsSENSeSWEepTINTerval OUTPut Output CommandsOUTPutOSCProtect OUTPutPROTectionCLEarSOURceCURRentIMMediate SOURceCURRentTRIGgered Default SuffixSOURceCURRentLIMitIMMediate SOURceCURRentLIMitTRIGgered SOURceCURRentLIMitBWIDthSOURceCURRentMODE SOURceCURRentLIMitMODE SOURceDELaySOURceDELayMODE SOURceVOLTageALCBWIDth SOURceFUNCtionMODESOURceVOLTageIMMediate SOURceVOLTageTRIGgered Query Syntax SOURceFUNCMODE? @channel listSOURceVOLTagePROTectionSTATe SOURceVOLTageMODEQuery Syntax SOURceVOLTagePROTectionSTATe? @channel list NR10 orSTATusOPERationENABle Status CommandsBit Configuration of Operation Status Registers STATusOPERationEVENt?Parameters Preset Value STATusPRESetCommand Syntax STATusPRESet Parameters None Examples STATusOPERationNTR STATusOPERationPTRQuery Syntax STATusQUEStionableENABle? @channel list STATusQUEStionableENABleSTATusQUEStionableCONDition? STATusQUEStionableNTR STATusQUEStionablePTRSYSTemVERSion? System CommandsSYSTemERRor? ABORt Trigger CommandsINITiateNAME TRIGgerACQuireTRIGgerTRANsientSOURce TRIGgerACQuireSOURceTRIGgerTRANsient RST ValueCommand Syntax *CLS Parameters None Common CommandsParameters Power-On Value Examples Bit Configuration of Standard Event Status Enable RegisterQuery Syntax *OPT? Returned Parameters Aard Field InformationExample RST Settings Power-on ValueQuery Syntax TST? Returned Parameters NR1 Bit Configuration of Status Byte RegisterTable A-1. Specifications Table A-2 Supplemental Characteristics Safety Output Common ModeDimensions WeightFigure A-1. Output Impedance Graphs all outputs Equipment Required Measurement Techniques Performance & Verification TestsProgramming Test SetupElectronic Load Voltage Priority Tests Program CommandsVoltage Programming and Readback Accuracy Positive Current Limit +CLNegative Current Limit -CL Action Program CommandsCurrent Programming and Readback Accuracy Current Priority TestsVoltage Priority, Constant Voltage Load Effect Load Effect TestsVoltage Priority, -Current Limit Load Effect Test Voltage Priority, +Current Limit Load EffectVoltage Priority, Constant Voltage Source Effect Source Effect TestsCurrent Priority Constant Current Test Voltage Priority, -Current Limit Source Effect Voltage Priority, +Current Limit Source EffectCurrent Priority, Constant Current Source Effect Voltage Priority Ripple and Noise Ripple and Noise TestsCurrent Priority Ripple and Noise Voltage Priority, Transient Recovery TimeTransient Response Tests Figure B-2. Transient Waveform Voltage Priority Current Priority Transient Recovery TimeFigure B-3. Transient Waveform Current Priority Performance Test Equipment FormPerformance Test Record Form Enable Calibration Mode Performing the Calibration ProcedurePositive Current Limit Calibration Negative Current Limit Calibration5A Range Current Measurement Calibration 100101 15mA Range Current Measurement CalibrationSaving the Calibration Constants Calibration Error Messages Changing the Calibration PasswordTable B-3. Gpib Calibration Error Messages Error Meaning103 Error Number ListTable C-1. Error Numbers 104 Error Messages105 Error Messages CPage 107 Line Voltage SelectionPage Mating Connector Part Numbers Earlier Version Output ConnectorsRear Panel Pinout Assignments CHG-2010-J01010-KEPPage 111 Index112 IndexScpi 113114 Canada Australia/New Zealand United States Latin AmericaEurope Asia Pacific JapanManual Updates
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