Agilent Technologies Comprehensive Guide to Agilent 6813B Yard Vacuum Specifications and Features
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1 - General Information

RMS Current Limit Circuit

The output rms current limit is adjustable to any value within the range of the unit. If the load attempts to draw more current than the programmed limit, the output voltage is reduced to keep the rms current within the limit. When the output voltage is reduced, the waveform shape is preserved. In other words, all parts of the voltage cycle are reduced -- not just the peaks.

NOTE: The speed at which the rms current circuit operates depends on the output voltage setting and the load impedance. The circuit responds more slowly at low output voltages and at high output impedances. With constant power or negative resistance loads, the rms current limit circuit causes the output voltage to go to zero.

Voltage Regulation

Real Time Regulation

The default method of output regulation used by the ac source is real-time voltage regulation. Real-time voltage regulation tries to provide the actual programmed waveform at the output of the ac source. It offers the best overall programming response and fastest settling times. It does not have any limitations for waveforms and transients with frequency content below 45 Hz.

RMS Regulation

Rms voltage regulation assists real-time regulation to level out or stabilize the rms value of the ac component of the output voltage. Use rms voltage regulation in the following situations:

♦If you experience load regulation effects with heavy loads.

♦If you experience frequency regulation problems with heavy loads and you require flatter programming accuracy at higher frequencies.

♦In conjunction with programmable output impedance, if you wish to maintain the rms level of output voltage as the source impedance is increases. (Refer to Output Impedance for more information.)

The command to specify voltage regulation is VOLT:ALC:DET RTIM RMS.

NOTE: Do not use rms voltage regulation when operating at frequencies less than 45 Hz.

Output Impedance

You can program the real and/or reactive (resistive and/or inductive) part of the output impedance of the ac source. Inductive output impedances can be programmed in the range of 20 to 1000 microhenries. Resistive load impedances can be programmed in the range of 0 to 1 ohms.

When programming output impedances, the lower your load impedance, the LESS programmed impedance you can use and still maintain output voltage stability. This applies particularly for load impedances less than 1 ohm.

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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 Introduction Performing the Calibration ProcedureEntry Keys Examples of Front Panel Programming Performing the Verification TestsError Number List Line Voltage ConversionPage Document Orientation TopicLocation Earlier AC Source Models Safety ConsiderationsOptions and Parts OptionsDescription Operator Replaceable PartsAgilent Part Number Front Panel/Remote Operation CapabilitiesModel Description Steady-state Output Characteristic Steady-state Output Characteristic in real-time modePeak Inrush Example Peak Current/Dynamic Power CapabilityPeak Current Limit Typical Peak Current Output CapacitiesIpeak setting Capacitance in μF 127 254Output Impedance RMS Current Limit CircuitVoltage Regulation Real Time RegulationOutput Coupling Page Damage Packaging Material CleaningInspection Items SuppliedRack Mounting LocationBench Operation Not block the fan exhaust at the rear of the unitInstalling the Power Cord Input ConnectionsInput Source and Line Fuse Connecting the Power Cord Output ConnectionsVoltage Drops Wire ConsiderationsRemote Sense Connections Current RatingsRemote Sense Connections Trigger Connections Digital ConnectionsRemote Sensing and OVP Considerations Gpib Connector Controller ConnectionsRS-232 Interface Interface CommandsRS-232 Connector RS-232 Data FormatHardware Handshake Null Modem Interface Lines Response Data TerminatorIntroduction Preliminary CheckoutUsing the Keypad Checkout ProcedurePress Protect Press 1, 2, 0, EnterPress Output On/Off Press 1, 6, 0, EnterPower-On Selftest Errors Error MessagesSelftest Errors Case of TroubleIndicates Runtime Error MessagesLine Fuse May appear at runtimePage Front Panel Description Front Panel, Overall ViewAC+DC Dis lay Command Function System KeysFunction Keys Immediate Action KeysScrolling Keys Display Measurement Display Command FunctionMeter Display Keys DisplayOutput Control Keys ListRST Protection and Status Control Keys ProtclearCLS IMM Trigger and List Control KeysInitimmed AbortEntry Keys Through Are used for entering numeric values Is the decimalSetting the Output Voltage Amplitude Examples of Front Panel ProgrammingSet the output to 120 V rms as follows To verify the output, use the meter menu Setting the Output FrequencySetting the DC Offset ActionBit Number Bit Weight Setting a Protection FeatureOvercurrent protection feature as follows Clearing Protection ConditionsUsing Transient Voltage Modes PulseVoltt Step TransientPulse Transient Voltm StepWidth List TransientVoltm Pulse DcycleDwel EOL Volt Trigger Delays and Phase SynchronizationVoltm Fixed List Count Dwel Volt EOL Step AutoSyncsour Phase Example DisplaySyncphas Initimmed Using Slew Rates to Generate Waveforms Programming Slew RatesStep Slewm Voltm FixedSlew SlewtCurrlev Syncsour Phase SyncphasMeasuring Peak Inrush Current CurrpeakSaving and Recalling Operating States Setting the Gpib Address and RS-232 ParametersTo configure the RS-232 interface, proceed as follows 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 RequiredTest Setup Table B-1. Equipment RequiredRecommended Model AC Voltage Programming and Measurement Accuracy Turn-On Checkout ProcedurePerforming the Verification Tests Action Normal ResultVolt 0, Outpcoup DC, Offset DC Voltage Programming and Measurement AccuracyRMS Current Accuracy Test Volt 50, Currrange LOW, CurrlevDC Programming and Measurement Accuracy Table B-2. Agilent 6811B Verification Test RecordTable B-3. Agilent 6812B Verification Test Record RMS Current Measurement AccuracyTable B-3 Table B-4. Agilent 6813B Verification Test RecordPerforming the Calibration Procedure Front Panel Calibration MenuEnable 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 the OVP Trip Point Calibrating and Entering rms Current ValuesSaving the Calibration Constants Calibrating and Entering rms Current Measurement ValuesCalibrating the Output Impedance OFFTable B-5. Gpib Calibration Error Messages Changing the Calibration PasswordCalibration 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 Open the Unit Check the Jumper Wire Model Agilent 6811B/6812B onlyCheck the Power Transformer Connector all Models Check the Line Jumpers all ModelsClose the Unit Figure D-1. Line Voltage Conversion ComponentsIndex Index Index Europe Asia Pacific United States Latin AmericaCanada Australia/New Zealand JapanManual Updates
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6812B, 6811B, 6813B specifications

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