Agilent Technologies 6834B, 6814B Trigger Connections, Digital Connections, OVP Considerations

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Installation - 2

OVP Considerations

The overvoltage protection circuit senses voltage near the output terminals, not at the load. Therefore the signal sensed by the OVP circuit can be significantly higher than the actual voltage at the load. When using remote sensing, you must program the OVP trip voltage high enough to compensate for the voltage drop between the output terminals and the load.

Output Rating

In remote sense applications, the voltage drop in the load leads subtracts from the available load voltage (see "Remote Sensing Capability" in appendix A). As the ac source increases its output to overcome this voltage drop, the sum of the programmed voltage and the load-lead drop may exceed the ac source’s maximum voltage rating. This will not damage the unit, but may trip the OV protection circuit, which senses the voltage at the output terminals.

Trigger Connections

The BNC trigger connectors on the rear panel let you apply trigger signals to the ac source as well as generate trigger signals from the ac source. The electrical characteristics of the trigger connectors are described in appendix A. More information on programming external triggers is found in Chapter 4 of the ac source Programming Guide.

Trigger IN Allows negative-going external trigger signals to trigger the ac source.

Trigger OUT Generates a negative-going pulse when the selected transient output has occurred.

Digital Connections

This connector, which is on the rear panel, is for connecting the fault and the inhibit signals. The fault (FLT) signal is also referred to as the DFI signal in the front panel and SCPI commands. The inhibit

(INH) signal is also referred to as the RI signal in the front panel and SCPI commands.

The connector accepts wires sizes from AWG 22 to AWG 12. Disconnect the mating plug to make your wire connections. The electrical characteristics of the digital connectors are described in appendix A. More information on programming the digital connectors is found in Chapter 4 of the ac source Programming Guide.

NOTE: It is good engineering practice to twist and shield all signal wires to and from the digital connectors

The following examples show how you can connect the FLT/INH circuits of the ac source.

In example A, the INH input connects to a switch that shorts pin + to pin ⊥ whenever it is necessary to disable output of the unit. This activates the remote inhibit (RI) circuit, which turns off the ac output. The front panel Prot annunciator comes on and the RI bit is set in the Questionable Status Event register. To re-enable the unit, first open the connection between pins + and ⊥ and then clear the protection circuit. This can be done either from the front panel or over the GPIB /RS-232.

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Contents User’s Guide AC Power Solutions Agilent Models 6814B, 6834B, and 6843ACertification Warranty InformationGeneral Safety SummarySafety Symbols EMC DeclarationPrinting History Acoustic Noise InformationTable of Contents Performing the Calibration Procedure Specifications Supplemental CharacteristicsError Number List Entry Keys Examples of Front Panel ProgrammingDocument Orientation TopicLocation Options, Accessories, and User Replaceable Parts Safety ConsiderationsOption Description Agilent Part NumberDescription CapabilitiesModel Description Output Characteristic Front Panel/Remote OperationRanges Output VA Capability AC Source Output Characteristic in real-time modePage 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 Output ConnectionsVoltage Drops Wire ConsiderationsCurrent Ratings Ampacity and Resistance of Stranded Copper ConductorsRemote Sense Connections Remote Sense ConnectionsDigital Connections Trigger ConnectionsOVP Considerations Output RatingController 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 KeypadProcedure Display Explanation VoltProtclear Currlev VoltprotCurrprot Currprot OFFError Messages Case of TroubleLine Fuse Page Front Panel, Overall View Front Panel DescriptionAC+DC System Keys Display Command FunctionAnnunciator On Phase Selected Function KeysImmediate Action Keys Meter Display Keys Scrolling KeysDisplay Measurement KBESSEL, RectDisplay Output Control KeysRST CLS Protection and Status Control KeysInitimmed Trigger and List Control KeysIMM AbortThrough Are used for entering numeric values Is the decimal Entry KeysProcedure for Single-Phase AC Sources Setting the Output Voltage AmplitudeExamples of Front Panel Programming Set the output to 120 V rms as followsPhase 3 to 235 Vrms Procedure for Three-Phase AC SourcesAction Display To verify the output, you can measure it as followsSetting the Output Frequency Setting a Protection FeatureOvercurrent protection feature as follows Step Transient Using Transient Voltage ModesVoltt Voltm StepVoltm Pulse Pulse TransientWidth DcycleList Transient ActionVoltm Fixed Voltm List Count Volt EOL Step Auto Trigger Delays and Phase SynchronizationSyncsour Phase Example DisplaySyncphas Initimmed Example Voltm Step Syncsour Phase Syncphas InitimmedProgramming Slew Rates Using Slew Rates to Generate WaveformsSlew Voltm FixedStep Slewm SlewtMeasuring Peak Inrush Current Syncsour Phase SyncphasRange 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 followsAddress Noutputs Specifications Table A-1. Performance Specifications1Agilent 6814B Agilent 6834B Agilent 6843A Table A-2. Supplemental Characteristics Supplemental CharacteristicsSpecifications a Page Characteristics Equipment RequiredRecommended Model Test Setup Turn-On Checkout ProcedurePerforming the Verification Tests Voltage Programming and Measurement Accuracy RMS Current Readback AccuracyAction Normal Result Agilent 6814B Current Measurement Accuracy Performing the Calibration ProcedureAgilent 6834B Current Measurement Accuracy Agilent 6843A Current Measurement AccuracyEnable Calibration Mode Front Panel CalibrationFront Panel Calibration Menu Calibrating the OVP trip point Calibrating and Entering Voltage Calibration ValuesCalibrating and Entering Current Calibration Values Calibrating the Output Impedance Agilent 6843A only Changing the Calibration PasswordSaving the Calibration Constants CalpassTable B-3. Gpib Calibration Error Messages Calibration Error MessagesCalibration Over the Gpib Agilent Calibration Program ListingFigure B-2. Calibration Program Listing Sheet 1 Figure B-2. Calibration Program Listing Sheet 2 Page Table C-1. Error Numbers Error Number ListError Messages Error Messages C Page Index Index Index Canada Australia/New Zealand United States Latin AmericaEurope Asia Pacific JapanManual Updates
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