Agilent Technologies 6813B, 6811B, 6812B Measuring Peak Inrush Current, Currlev, Currpeak, Pk Nr

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Front Panel Operation - 4

9 - Measuring Peak Inrush Current

Peak inrush current is a non-repetitive measurement in the sense that peak inrush current occurs only when the unit under test is first turned on. In order to repeat the measurement, you must turn the unit off and wait for any input filter capacitors to discharge completely.

This example shows you how you can measure the peak inrush current using the front panel meter. The voltage is set to 120 V rms and the output is triggered at an output phase of 75°, which optimizes the conditions under which inrush current is applied to the unit under test.

 

Action

Display

1.

Set the immediate voltage to 0. Press Voltage, then press 0 and Enter.

VOLT

0

2.

Set the triggered voltage to 120 V rms. In the Voltage menu, press to

VOLT:T

120

 

access the triggered voltage command. Then press 1 2 0 Enter.

 

 

3.

Set the voltage mode to step. In the Voltage menu, press to access the

VOLT:M

STEP

 

mode command. Press ° to scroll to STEP and press Enter.

 

 

4.

Make sure the triggered voltage slew rate is set to the fastest possible speed.

SLEW:T 9.9000+E37

 

In the Voltage menu, access the triggered slew command. If necessary, reset

 

 

 

the slew rate to a faster speed.

 

 

5.

Make sure the peak current and rms current limits are set to high values. In the

CURR:LEV 6.5

 

Current menu, access the rms current limit and then the peak current limit

CURR:PEAK 40

 

commands. If necessary, reset the rms current and the peak current limits to

 

 

 

higher values.

 

 

 

(Agilent 6811B units have an rms current limit of 3.25 A. Agilent 6813B units

 

 

 

have an rms current limit of 13 A and a peak current limit of 80 A)

 

 

6.Synchronize the trigger source with a reference phase angle. In the Trigger Control menu, press to access the sync source command. Press ° to obtain PHASE and press Enter.

7.Set the reference phase angle to 75°. In the Trigger Control menu, press to access the sync phase command. Then press 7 5 Enter.

SYNC:SOUR PHASE

SYNC:PHAS 75

8.

Initiate (or enable) the unit for one immediate trigger from the front panel.

INIT:IMMED

 

Press Trigger Control and Enter.

 

 

9.

Set the meter function to measure nonrepetitive peak inrush current. In the

0 A

PK NR

 

Meter menu, press to access the peak inrush current display.

 

 

10.

Enable the output by pressing Output On/Off.

0 V

60 HZ

11.

Send the trigger to step the output from 0 V to 120 V. Press Shift Trigger.

48 A

PK NR

 

The inrush current is displayed on the Meter.

 

 

NOTE: With fast and/or large voltage transitions, the CC annunciator may turn on due to current in the output capacitor. This is normal and will limit the rate of change of output voltage. To prevent the CC operating mode from limiting the rate of change of output voltage, program the peak current limit to a higher value.

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Contents User’s Guide AC Power Solutions Agilent Models 6811B, 6812B, and 6813BCertification Warranty InformationGeneral Safety SummarySafety Symbols EMC DeclarationPrinting History Acoustic Noise InformationTable of Contents Entry Keys Examples of Front Panel Programming Performing the Calibration ProcedureIntroduction Performing the Verification TestsLine Voltage Conversion Error Number ListPage Document Orientation TopicLocation Options and Parts Safety ConsiderationsEarlier AC Source Models OptionsDescription Operator Replaceable PartsAgilent Part Number Front Panel/Remote Operation CapabilitiesModel Description Steady-state Output Characteristic in real-time mode Steady-state Output CharacteristicPeak Current Limit Peak Current/Dynamic Power CapabilityPeak Inrush Example Typical Peak Current Output CapacitiesCapacitance in μF 127 254 Ipeak settingVoltage Regulation RMS Current Limit CircuitOutput Impedance Real Time RegulationOutput Coupling Page Inspection CleaningDamage Packaging Material Items SuppliedBench Operation LocationRack Mounting Not block the fan exhaust at the rear of the unitInstalling the Power Cord Input ConnectionsInput Source and Line Fuse Output Connections Connecting the Power CordRemote Sense Connections Wire ConsiderationsVoltage Drops Current RatingsRemote Sense Connections Trigger Connections Digital ConnectionsRemote Sensing and OVP Considerations Controller Connections Gpib ConnectorRS-232 Connector Interface CommandsRS-232 Interface RS-232 Data FormatNull Modem Interface Lines Response Data Terminator Hardware HandshakePreliminary Checkout IntroductionCheckout Procedure Using the KeypadPress Output On/Off Press 1, 2, 0, EnterPress Protect Press 1, 6, 0, EnterSelftest Errors Error MessagesPower-On Selftest Errors Case of TroubleLine Fuse Runtime Error MessagesIndicates May appear at runtimePage Front Panel, Overall View Front Panel DescriptionAC+DC System Keys Dis lay Command FunctionFunction Keys Immediate Action KeysScrolling Keys Meter Display Keys Display Command FunctionDisplay Measurement DisplayList Output Control KeysRST Protection and Status Control Keys ProtclearCLS Initimmed Trigger and List Control KeysIMM AbortThrough Are used for entering numeric values Is the decimal Entry KeysSetting the Output Voltage Amplitude Examples of Front Panel ProgrammingSet the output to 120 V rms as follows Setting the DC Offset Setting the Output FrequencyTo verify the output, use the meter menu ActionOvercurrent protection feature as follows Setting a Protection FeatureBit Number Bit Weight Clearing Protection ConditionsPulse Using Transient Voltage ModesPulse Transient Step TransientVoltt Voltm StepVoltm Pulse List TransientWidth DcycleVoltm Fixed List Count Dwel Trigger Delays and Phase SynchronizationDwel EOL Volt Volt EOL Step AutoSyncsour Phase Example DisplaySyncphas Initimmed Programming Slew Rates Using Slew Rates to Generate WaveformsSlew Voltm FixedStep Slewm SlewtMeasuring Peak Inrush Current Syncsour Phase SyncphasCurrlev CurrpeakTo configure the RS-232 interface, proceed as follows Setting the Gpib Address and RS-232 ParametersSaving and Recalling Operating States Action Display To set the Gpib address, proceed as followsTable A-1. Performance Specifications1 SpecificationsTable A-1. Performance Specifications Table A-2. Supplemental Characteristics Supplemental CharacteristicsTrig Out HC TTL output Trig In 10k pullup Table A-3. Operation Below 45 Hz Operation Below 45 HzPage Equipment Required Verification and CalibrationTest Setup Table B-1. Equipment RequiredRecommended Model Performing the Verification Tests Turn-On Checkout ProcedureAC Voltage Programming and Measurement Accuracy Action Normal ResultRMS Current Accuracy Test DC Voltage Programming and Measurement AccuracyVolt 0, Outpcoup DC, Offset Volt 50, Currrange LOW, CurrlevTable B-3. Agilent 6812B Verification Test Record Table B-2. Agilent 6811B Verification Test RecordDC Programming and Measurement Accuracy RMS Current Measurement AccuracyTable B-4. Agilent 6813B Verification Test Record Table B-3Front Panel Calibration Menu Performing the Calibration ProcedureEnable Calibration Mode Front Panel CalibrationCalibrating and Entering Voltage Offset Values Calibrating and Entering DC Voltage Gain Values Calibrating and Entering AC rms Voltage Gain ValuesCallev P4 Calibrating and Entering rms Current Values Calibrating the OVP Trip PointCalibrating the Output Impedance Calibrating and Entering rms Current Measurement ValuesSaving the Calibration Constants OFFCalibration Error Messages Changing the Calibration PasswordTable B-5. Gpib Calibration Error Messages Calibration Over the GpibFigure B-2. Calibration Program Listing Sheet 1 Figure B-2. Calibration Program Listing Sheet 2 Figure B-2. Calibration Program Listing Sheet 3 Page Table C-1. Error Numbers Error Number ListError Messages Error Messages C Page Check the Power Transformer Connector all Models Check the Jumper Wire Model Agilent 6811B/6812B onlyOpen the Unit Check the Line Jumpers all ModelsFigure D-1. Line Voltage Conversion Components Close the UnitIndex Index Index Canada Australia/New Zealand United States Latin AmericaEurope Asia Pacific JapanManual Updates
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