Agilent Technologies N3280A manual Transient Response Tests, Current Priority Ripple and Noise

Page 95

Performance and Calibration Procedures

Current Priority Ripple and Noise

Periodic and random deviations (PARD) in the output combine to produce a residual ac current, as well as an ac voltage superimposed on the dc output. PARD is specified as the rms output current in a frequency range specified in Appendix A.

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-1d to an ac rms voltmeter. Remember to include a 50 ohm series resistor at the dc source end of the cable. Also connect a 16k ohm load resistor across the HI and LO terminals.

2.Turn on the dc source and program the Current Priority mode. Program the current to the maximum value (0.5mA).

3.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.

4.Divide the voltage reading ac rms voltmeter by 16k (the value of the load resistor). The result should be within the limit in the performance test record card under Current Priority PARD Current.

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

“STAT:OPER:COND? (@1)”

Transient Response Tests

Voltage Priority, Transient Recovery Time

This test measures the time for the output voltage to recover to within the specified value following a 50% change in the load current using an RC network of a 10∝F capacitor and 0.2 ohm resistor across the output. The test must be performed in all three bandwidths: 10kHz, 20kHz, and 30kHz.

Action

1.Turn off the dc source and connect the output as in Figure B-1e with the oscilloscope across the HI and LO sense terminals. Remember to connect the RC network (10∝F & 0.2 ohm).

2.Turn on the dc source and program the Voltage Priority mode (this is the default mode). Program the output voltage to the full-scale value (10.0V), the current to the maximum value (0.5A), and the bandwidth to 10kHz.

3.Program the Electronic Load as follows:

Input current = 0.25A

Transient current level = 0.5A

Transient frequency = 2kHz

Current slew rate = 0.167A/∝s

Transient duty cycle = 50%

Turn the transient generator on.

4.Adjust the oscilloscope for a waveform similar to that in Figure B-2. The output voltage should return to within ±40mV in less than 60∝s, 45∝s, or 35∝s following a 0.25A to 0.5A load change. Check both loading and unloading transients by triggering on the positive and negative slope. Record the voltage at time “t” in the performance test record card under Voltage Priority Transient Response Voltage.

5.Repeat steps 2 through 4 for the 20kHz and the 30kHz bandwidths.

Program Commands

“OUTP OFF,(@1)”

“OUTP ON,(@1)” “SOUR:FUNC:MODE VOLT,(@1)” “VOLT 10,(@1)” “CURR:LIM 0.5,(@1)” “VOLT:ALC:BWID 10000,(@1)”

Loading

ttttTransient

v

 

t

 

t

v

 

 

Unloading

Transient

“VOLT:ALC:BWID 20000,(@1)” “VOLT:ALC:BWID 30000,(@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 CommandsTransient Response Tests Error Number List 103Ripple and Noise 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 ConnectionsOutputs 1 Turn the unit off before connecting any wiresOutput Connections 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 Explanation Checkout ProcedureProcedure Case of Trouble Selftest Error MessagesRuntime Error Messages Power-On Selftest ErrorsPage Scpi References External ReferencesGpib Capabilities of the DC Source Gpib ReferencesConventions Used in This Guide Types of Scpi CommandsIntroduction to Scpi Moving Among Subsystems Multiple Commands in a MessageIncluding Common Commands Using QueriesChannel List Parameter Types of Scpi MessagesMessage Unit 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 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 CyclesReturning All Measurement Data From the Data Buffer Triggered MeasurementsCurrent Ranges Window FunctionsSelecting 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 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 InterruptProgramming Parameters Subsystem CommandsCommon Commands Save new cal constants in non-volatile memory Scpi Programming Commands At a GlanceSubsystem Commands Syntax 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 CALibrateDATECALibrateVOLTage CALibrateSAVECALibrateSTATe Query Syntax Measurement CommandsFETChARRayCURRent? FETChARRayVOLTage? FETChCURRent? FETChVOLTage?Enter values greater than 0.015A MEASureARRayCURRent? MEASureARRayVOLTage?MEASureCURRent? MEASureVOLTage? SENSeCURRentRANGeQuery Syntax SENSeFUNCtion? @channel list SENSeFUNCtionSENSeSWEepNPLCycles SENSeSWEepOFFSetPOINtsSENSeWINDow SENSeSWEepPOINtsSENSeSWEepTINTerval OUTPutPROTectionCLEar Output CommandsOUTPut OUTPutOSCProtectSOURceCURRentLIMitBWIDth Default SuffixSOURceCURRentIMMediate SOURceCURRentTRIGgered SOURceCURRentLIMitIMMediate SOURceCURRentLIMitTRIGgeredSOURceCURRentMODE SOURceCURRentLIMitMODE SOURceDELaySOURceDELayMODE 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?SYSTemVERSion? System CommandsSYSTemERRor? TRIGgerACQuire Trigger CommandsABORt INITiateNAMERST Value TRIGgerACQuireSOURceTRIGgerTRANsientSOURce TRIGgerTRANsientBit Configuration of Standard Event Status Enable Register Common CommandsCommand Syntax *CLS Parameters None Parameters Power-On Value ExamplesQuery 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 Weight Output Common ModeSafety DimensionsFigure A-1. Output Impedance Graphs all outputs Equipment Required Measurement Techniques Performance & Verification TestsProgramming Test SetupElectronic Load 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 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 Procedure100 Negative Current Limit CalibrationPositive Current Limit Calibration 5A Range Current Measurement Calibration101 15mA Range Current Measurement CalibrationSaving the Calibration Constants Error Meaning Changing the Calibration PasswordCalibration Error Messages Table B-3. Gpib Calibration Error Messages103 Error Number ListTable C-1. Error Numbers 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
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