Agilent Technologies 6811B, 6813B, 6812B Peak Current/Dynamic Power Capability, Peak Current Limit

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1 - General Information

Peak Current/Dynamic Power Capability

The ac source can generate peak currents that exceed the rms current capability of the unit. This not only applies when operating in ac mode, but also when programming output pulses in dc mode. Although the unit will generate peak output currents up to 40A (Agilent 6811B/6812B) or 80A (Agilent 6813B), the unit can only maintain this output for a limited time. If the output of the unit exceeds the limit of the safe operating area (SOA), the unit will activate its internal protection mode and turn its output off. This SOA limit is based on output voltage, output current, output duration, and heatsink temperature.

NOTE: Refer to Chapter 4 on how to clear the unit when the internal protection mode has been activated.

Peak Current Limit

By programming the peak current limit, you can prevent the unit from exceeding the safe operating area, activating its internal protection mode, and turning the output off. The peak current limit circuit limits the instantaneous output current. It functions by reducing the instantaneous output voltage to keep the output peak current within the programmed limit. Because the circuit acts instantly, the effect is that it will clip the peaks of the output voltage waveform. Additionally, with fast and/or large voltage transitions, the unit may momentarily go into CC operating mode due to current in the output capacitor. This serves to limit the rate of change of output voltage.

The following table gives approximate indications of how long the unit will tolerate peak output currents before the SOA limits are exceeded. Because these values are voltage dependent, the table includes various equivalent dc voltages along with the peak current values. The voltages shown in the table are NOT the programmed voltages, but the average voltage values that will appear at the output when the indicated high current condition exists. The SOA circuit becomes active at higher voltage and current values as well as at longer duration times.

Agilent

6813B

Table 1-3. Typical Peak Current Output Capacities

 

 

 

Agilent 6811B

 

equivalent dc voltage when current is flowing 1

 

Agilent 6812B

25

 

75

125

190

 

250

 

360

20A

30A

40A

50A

60A

70A

80A

10A

15A

20A

25A

30A

35A

40A

>100 ms >100 ms

12ms

5.6 ms

3.7 ms

2.6 ms

2 ms

>100 ms

100ms

9.2 ms

5.1 ms

3.4 ms

2.4 ms

1.8 ms

>100 ms

30ms

8.4 ms

4.7 ms

3.1 ms

2.2 ms

1.7 ms

>100 ms

24ms

7.6 ms

4.4 ms

2.9 ms

2.1 ms

1.6 ms

>100 ms

19ms

6.8 ms

4 ms

2.6 ms

1.9 ms

1.4 ms

>100 ms

15ms

5.9 ms

3.5 ms

2.3 ms

1.7 ms

1.3 ms

1Based on 25C ambient temperature, with heatsink temperature less than 50C.

Peak Inrush Example

The following table gives the recommended initial Ipeak settings when the ac source output is a 127 Vac or 254 Vac 60 Hz sine wave, as a function of load capacitance. The load on the output is a full-wave bridge along with the indicated capacitor. The load resistance across the capacitor is infinite. The recommended Ipeak will change as a function of changes in input as follows:

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Contents AC Power Solutions Agilent Models 6811B, 6812B, and 6813B User’s GuideWarranty Information CertificationSafety Summary GeneralSafety Symbols Declaration EMCAcoustic Noise Information Printing HistoryTable of Contents Performing the Calibration Procedure Entry Keys Examples of Front Panel ProgrammingIntroduction Performing the Verification TestsError Number List Line Voltage ConversionPage Topic Document OrientationLocation Safety Considerations Options and PartsEarlier AC Source Models OptionsOperator Replaceable Parts DescriptionAgilent Part Number Capabilities Front Panel/Remote OperationModel Description Steady-state Output Characteristic Steady-state Output Characteristic in real-time modePeak Current/Dynamic Power Capability Peak Current LimitPeak Inrush Example Typical Peak Current Output CapacitiesIpeak setting Capacitance in μF 127 254RMS Current Limit Circuit Voltage RegulationOutput Impedance Real Time RegulationOutput Coupling Page Cleaning InspectionDamage Packaging Material Items SuppliedLocation Bench OperationRack Mounting Not block the fan exhaust at the rear of the unitInput Connections Installing the Power CordInput Source and Line Fuse Connecting the Power Cord Output ConnectionsWire Considerations Remote Sense ConnectionsVoltage Drops Current RatingsRemote Sense Connections Digital Connections Trigger ConnectionsRemote Sensing and OVP Considerations Gpib Connector Controller ConnectionsInterface Commands RS-232 ConnectorRS-232 Interface RS-232 Data FormatHardware Handshake Null Modem Interface Lines Response Data TerminatorIntroduction Preliminary CheckoutUsing the Keypad Checkout ProcedurePress 1, 2, 0, Enter Press Output On/OffPress Protect Press 1, 6, 0, EnterError Messages Selftest ErrorsPower-On Selftest Errors Case of TroubleRuntime Error Messages Line FuseIndicates May appear at runtimePage Front Panel Description Front Panel, Overall ViewAC+DC Dis lay Command Function System KeysImmediate Action Keys Function KeysScrolling Keys Display Command Function Meter Display KeysDisplay Measurement DisplayOutput Control Keys ListRST Protclear Protection and Status Control KeysCLS Trigger and List Control Keys InitimmedIMM AbortEntry Keys Through Are used for entering numeric values Is the decimalExamples of Front Panel Programming Setting the Output Voltage AmplitudeSet the output to 120 V rms as follows Setting the Output Frequency Setting the DC OffsetTo verify the output, use the meter menu ActionSetting a Protection Feature Overcurrent protection feature as followsBit Number Bit Weight Clearing Protection ConditionsUsing Transient Voltage Modes PulseStep Transient Pulse TransientVoltt Voltm StepList Transient Voltm PulseWidth DcycleTrigger Delays and Phase Synchronization Voltm Fixed List Count DwelDwel EOL Volt Volt EOL Step AutoExample Display Syncsour PhaseSyncphas Initimmed Using Slew Rates to Generate Waveforms Programming Slew RatesVoltm Fixed SlewStep Slewm SlewtSyncsour Phase Syncphas Measuring Peak Inrush CurrentCurrlev CurrpeakSetting the Gpib Address and RS-232 Parameters To configure the RS-232 interface, proceed as followsSaving and Recalling Operating States Action Display To set the Gpib address, proceed as followsSpecifications Table A-1. Performance Specifications1Table A-1. Performance Specifications Supplemental Characteristics Table A-2. Supplemental CharacteristicsTrig Out HC TTL output Trig In 10k pullup Operation Below 45 Hz Table A-3. Operation Below 45 HzPage Verification and Calibration Equipment RequiredTable B-1. Equipment Required Test SetupRecommended Model Turn-On Checkout Procedure Performing the Verification TestsAC Voltage Programming and Measurement Accuracy Action Normal ResultDC Voltage Programming and Measurement Accuracy RMS Current Accuracy TestVolt 0, Outpcoup DC, Offset Volt 50, Currrange LOW, CurrlevTable B-2. Agilent 6811B Verification Test Record Table B-3. Agilent 6812B Verification Test RecordDC Programming and Measurement Accuracy RMS Current Measurement AccuracyTable B-3 Table B-4. Agilent 6813B Verification Test RecordPerforming the Calibration Procedure Front Panel Calibration MenuFront Panel Calibration Enable Calibration ModeCalibrating and Entering Voltage Offset Values Calibrating and Entering AC rms Voltage Gain Values Calibrating and Entering DC Voltage Gain ValuesCallev P4 Calibrating the OVP Trip Point Calibrating and Entering rms Current ValuesCalibrating and Entering rms Current Measurement Values Calibrating the Output ImpedanceSaving the Calibration Constants OFFChanging the Calibration Password Calibration Error MessagesTable 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 Error Number List Table C-1. Error NumbersError Messages Error Messages C Page Check the Jumper Wire Model Agilent 6811B/6812B only Check the Power Transformer Connector all ModelsOpen the Unit Check the Line Jumpers all ModelsClose the Unit Figure D-1. Line Voltage Conversion ComponentsIndex Index Index United States Latin America Canada Australia/New ZealandEurope Asia Pacific JapanManual Updates
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