Agilent Technologies N3280A manual Source Effect Tests, Current Priority Constant Current Test

Page 91

Performance and Calibration Procedures

Current Priority Constant Current Test

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

NOTE: The voltage limits in Current Priority Mode are not programmable.

Action	Program Commands
1. Turn off the dc source and connect the output as shown in Figure B-1c	“*RST”
with an ammeter in series with a 16k ohm load resistor across the Hi
and Lo output terminals. Also connect a shorting switch across the
resistor.

2.Start with a short across the output (switch closed). Turn on the dc source and program the Current Priority mode. Program the current to the maximum value (0.5mA).

3.Set the ammeter to the 1A range, and record the output current reading on the ammeter (shorted-output value).

5.Remove the short from the output (open the switch).

6.Read back the N3280A status to be sure that it’s in the CC mode. This query should return a Bit value of “8” for CC mode.

7.Record the output current reading on the ammeter (full-load current value).

The difference between the two current readings is the Load Effect current and should be within the limits listed in the performance test record card for the appropriate model under Current Priority Load Effect Current.

“OUTP ON,(@1)” “SOUR:FUNC:MODE CURR,(@1)” “CURR 0.0005,(@1)”

“STAT:OPER:COND? (@1)”

Source Effect Tests

These tests measure the change in output voltage or current that results from a change in ac line voltage from the minimum to maximum value within the line voltage specifications. The tests should all be done at 60Hz line frequency.

Voltage Priority, Constant Voltage Source Effect

Action

Program Commands

1.Connect the ac input of the dc source to a variable voltage transformer (or ac source). Set the transformer to nominal line voltage.

Connect the output as shown in Figure B-1b with a 20 ohm resistor or an electronic load across the output terminals and a DVM across the Hi and Lo sense terminals.

2.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.If you are using an electronic load, adjust it for the full-scale output current, 0.5A.

“OUTP ON,(@1)” “VOLT 10,(@1)” “CURR:LIM 0.5125,(@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 Gpib Capabilities of the DC Source Introduction to Scpi Types of Scpi CommandsScpi Command Completion Using Device Clear External ReferencesStatus Commands Scpi Programming Commands At a Glance Calibration CommandsMeasurement Commands Output CommandsVoltage Priority Tests System CommandsTrigger Commands Common CommandsRipple and Noise Tests Error Number List 103Transient Response Tests Page Document Orientation Safety ConsiderationsOption Description Options and AccessoriesDescription Remote ProgrammingVoltage Priority Operation Output CharacteristicsCurrent Priority Operation Output Characteristic Current PriorityMeasurement Characteristics Start of a Measurement Additional Items CleaningInspection Damage Packaging MaterialDo not block the fan exhaust at the rear of the unit LocationBench Operation Rack MountingConnect the Power Cord Power ConnectionsOutput Connections Turn the unit off before connecting any wiresOutputs 1 AWG No Maximum Ampacity Resistance at 20 deg. C Free air Current RatingsVoltage Drops and Lead Resistance Ampacity and Resistance of Stranded Copper ConductorsGuard Connections for Test Fixtures Coaxial Guard ConnectionsOVP Considerations External Trigger ConnectionsComputer Connections Maintaining StabilityGpib Address Settings for Power Module Configuration SwitchSwitch Setting Switch Setting AddressFront Panel Description Procedure Checkout ProcedureExplanation Case of Trouble Selftest Error MessagesRuntime Error Messages Power-On Selftest ErrorsPage Scpi References External ReferencesGpib Capabilities of the DC Source Gpib ReferencesIntroduction to Scpi Types of Scpi CommandsConventions Used in This Guide Moving Among Subsystems Multiple Commands in a MessageIncluding Common Commands Using QueriesMessage Unit Types of Scpi MessagesChannel List Parameter Scpi Data Formats Class Suffix Unit Unit with Multiplier Scpi Command CompletionSuffixes and Multipliers Response Data TypesOutputstate Example Using Device ClearPage Enabling the Output Power-on InitializationIntroduction Programming the OutputOvervoltage Protection Output ModeOutput Current Oscillation Protection Triggering Output ChangesOutput Trigger Model Enabling the Output Trigger System Setting the Voltage and Current Trigger LevelsSelecting the Output Trigger Source Generating Output Triggers Making MeasurementsAverage Measurements Measurement Samples and Time Interval Power Line CyclesReturning All Measurement Data From the Data Buffer Triggered MeasurementsCurrent Ranges Window FunctionsEnabling the Measurement Trigger System Measurement Trigger ModelSelecting the Measurement Trigger Source Selecting the Sensing Function Output Settling DelayGenerating Measurement Triggers 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 RegistersMSS and RQS Bits Questionable Status GroupStandard Event Status Group Status Byte RegisterServicing Operation Status and Questionable Status Events Determining the Cause of a Service InterruptCommon Commands Subsystem CommandsProgramming Parameters Subsystem Commands Syntax Scpi Programming Commands At a GlanceSave new cal constants in non-volatile memory Sets the triggered output voltage in voltage priority mode Mode mode, @list DELayFUNCtion Mode mode, @list VOLTage Sets the output voltage in voltage priority modeOutput Programming Parameters Common Commands SyntaxESE n SRE nCALibrateCURRentMEASure Calibration CommandsCALibrateCURRent CALibrateCURRentLIMitPOSitive CALibrateCURRentLIMitNEGativeCALibrateLEVel CALibratePASSwordCALibrateDATA CALibrateDATECALibrateSTATe CALibrateSAVECALibrateVOLTage Query Syntax Measurement CommandsFETChARRayCURRent? FETChARRayVOLTage? FETChCURRent? FETChVOLTage?Enter values greater than 0.015A MEASureARRayCURRent? MEASureARRayVOLTage?MEASureCURRent? MEASureVOLTage? SENSeCURRentRANGeQuery Syntax SENSeFUNCtion? @channel list SENSeFUNCtionSENSeSWEepNPLCycles SENSeSWEepOFFSetPOINtsSENSeSWEepTINTerval SENSeSWEepPOINtsSENSeWINDow OUTPutPROTectionCLEar Output CommandsOUTPut OUTPutOSCProtectSOURceCURRentLIMitBWIDth Default SuffixSOURceCURRentIMMediate SOURceCURRentTRIGgered SOURceCURRentLIMitIMMediate SOURceCURRentLIMitTRIGgeredSOURceDELayMODE SOURceDELaySOURceCURRentMODE SOURceCURRentLIMitMODE Query Syntax SOURceFUNCMODE? @channel list SOURceFUNCtionMODESOURceVOLTageALCBWIDth SOURceVOLTageIMMediate SOURceVOLTageTRIGgeredNR10 or SOURceVOLTageMODESOURceVOLTagePROTectionSTATe Query Syntax SOURceVOLTagePROTectionSTATe? @channel listSTATusOPERationEVENt? Status CommandsSTATusOPERationENABle Bit Configuration of Operation Status RegistersSTATusOPERationNTR STATusOPERationPTR STATusPRESetParameters Preset Value Command Syntax STATusPRESet Parameters None ExamplesSTATusQUEStionableNTR STATusQUEStionablePTR STATusQUEStionableENABleQuery Syntax STATusQUEStionableENABle? @channel list STATusQUEStionableCONDition?SYSTemERRor? System CommandsSYSTemVERSion? TRIGgerACQuire Trigger CommandsABORt INITiateNAMERST Value TRIGgerACQuireSOURceTRIGgerTRANsientSOURce TRIGgerTRANsientBit Configuration of Standard Event Status Enable Register Common CommandsCommand Syntax *CLS Parameters None Parameters Power-On Value ExamplesExample Field InformationQuery Syntax *OPT? Returned Parameters Aard RST Settings Power-on ValueQuery Syntax TST? Returned Parameters NR1 Bit Configuration of Status Byte RegisterTable A-1. Specifications Table A-2 Supplemental Characteristics Weight Output Common ModeSafety DimensionsFigure A-1. Output Impedance Graphs all outputs Equipment Required Measurement Techniques Performance & Verification TestsElectronic Load Test SetupProgramming Positive Current Limit +CL Program CommandsVoltage Priority Tests Voltage Programming and Readback AccuracyNegative 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 EffectCurrent Priority Constant Current Test Source Effect TestsVoltage Priority, Constant Voltage Source Effect 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 TestsTransient Response Tests Voltage Priority, Transient Recovery TimeCurrent Priority Ripple and Noise 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 Procedure100 Negative Current Limit CalibrationPositive Current Limit Calibration 5A Range Current Measurement CalibrationSaving the Calibration Constants 15mA Range Current Measurement Calibration101 Error Meaning Changing the Calibration PasswordCalibration Error Messages Table B-3. Gpib Calibration Error MessagesTable C-1. Error Numbers Error Number List103 104 Error Messages105 Error Messages CPage 107 Line Voltage SelectionPage CHG-2010-J01010-KEP Earlier Version Output ConnectorsMating Connector Part Numbers Rear Panel Pinout AssignmentsPage 111 Index112 IndexScpi 113114 Japan United States Latin AmericaCanada Australia/New Zealand Europe Asia PacificManual Updates