HP 6623A, 6624A, 6621A manual Output Type Formula, Output Noise Considerations, Open Sense Leads

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OUTPUT TYPE

FORMULA

(40 W & 80 W)

 

LV Output CV Reg Error(mV) = Rs ( Vset45 - Vdrop1.1 )

HV Output CV Reg Error(mV) = Rs ( Vset105 - Vdrop3.3 )

CV Regulation Error = Remotely sensed voltage will change by this number of millivolts.

Rs = Resistance of each sense lead in Ω .

Vset = Programmed voltage value in volts.

Vdrop = Total drop in the load leads in volts.

In addition, include ±1 mV error per 200 mV drop in the -V load lead independent of Rs value.

Output Noise Considerations

Any noise picked up on the sense leads will appear at the supply's output and may adversely affect CV load regulation. Twist the sense leads or use a ribbon cable to minimize the pickup of external noise. In extremely noisy environments it may be necessary to shield the sense leads. Ground the shield at the power supply end only; do not use the shield as one of the sensing conductors.

The noise specifications in Table 1-1 apply at the power supply output terminals when using local sensing. However, voltage transients may be produced at the load by noise induced in the leads or by load current transients acting on the inductance and resistance of the load lead. If it is desirable to keep voltage transient levels to a minimum, place an aluminum or a tantalum capacitor, with an approximate value of 10 μF per foot (30.5cm) of load lead, right across the load (see Figure 4-5). Refer to Figure 1-4 for capacitive load stability considerations.

Programming Response Time with an Output Capacitor

Because voltage programming into an external output capacitor may cause the supply to briefly enter CC operating mode, voltage programming response time may be longer than that specified in Table 1-1. Use the following formula to estimate the additional response time:

Additional =

(Added Output Capacitor)(Change in Vout)

Response

Current Limit Setting

Time

 

Open Sense Leads

The sense leads are part of the supply's feedback path. Connect them in such a way so that they do not inadvertently become open circuited. The power supply includes protection resistors that reduce the effect of open sense leads during remote-sensing operation. If the sense leads open during operation, the supply returns to the local sensing mode, with the voltage at the output terminals approximately 2.5% higher (low voltage outputs) or approximately 3% higher (high voltage outputs) than the programmed value.

Output Connections and Operating Information 51

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Contents HP Part No Operating ManualCertification Safety Summary Symbol Description Safety SummaryEMC Declaration of ConformityAppendix D--Error Messages Installation ProceduresAppendix A--Calibration Procedure Appendix C--Command SummaryTable Of Contents Local Operation Remote OperationProgramming With The Series 200/300 Computer Command SummaryError Messages CalibrationPage Instrument and Manual Identification Safety ConsiderationsGeneral Information IntroductionAccessories DescriptionOutput Combinations Available Model Basic Operation Output Low Range Values High Range ValuesHP-IB Board Output Boards Specifications Qualifying ConditionsDefinitions Output Response Characteristics Source Effect SpecificationsOutputs Low High Voltage Temperature Coefficient Supplemental CharacteristicsCommand Processing Time see Figure Outputs Low High Voltage Programming ResolutionReadback Resolution AC Input Power and CurrentLow Voltage High Voltage 80 W Low Voltage Safety Agency ComplianceDimensions all models Output ImpedanceGeneral Information General Information General Information General Information Installation Initial InspectionLocation and Cooling Line Fuse Input Power Requirements100/120 2110-0342 220/240 2110-0055 Line FusesLine Voltage Conversion Power CordHP-IB Interface Connector Page Front Panel Controls and Indicators Getting StartedTurning On Your Supply HP-IB Status Annunciators LCL keySystem Control Keys Power Supply StatusAnnunciators Alphanumeric LCDOutput Control Keys Line Switch Numeric Entry KeysNormal Self Test Indications Sample Self-Test Failure Display Checking Out Your Supply Using Local ControlVoltage Test Overvoltage TestCurrent Test Enter/Output Statements Introduction To Remote OperationIset Enter OCPAddr Sending a Remote CommandOutput Reading the HP-IB AddressOften Used Commands Getting Data From The SupplyDisp a Disp a Returning the Supply to Local Mode Output Ranges Output Connections and Operating InformationProtection Features Operating QuadrantsRange Selection Typical Output Range Characteristics Connecting the Load Page Wire Bundled 10 a 20 a Feet Cross Section Meters Area in mm2 Remote Voltage Sensing Multiple LoadsPositive and Negative Voltages Remote Sense Connections Remote Voltage SensingOpen Sense Leads Output Type FormulaOutput Noise Considerations Programming Response Time with an Output CapacitorExternal Trigger Circuit Overvoltage Trigger ConnectionsEquivalent Internal OV Trigger Circuit Power Supply Protection Considerations Battery ChargingParallel Operation CV Operation Maximum Allowable Voltage SettingRemote Sensing CC Operation13. Series Connections with Local Sensing CV Operation Series Operation14. Series Connections with Remote Sensing Specifications for Series OperationPage Page Remote Operation HP-IB OperationInterface Function HP-IB Address Selection Power-On Service Request PON Programming SyntaxNumeric Data Sheet 1 of 2. Syntax Forms for Power Supply Commands Sheet 2 of 2. Syntax Forms for Power Supply Commands Ovset Fault ?Vset IsetPage Initial Conditions Power Supply CommandsCurrent Programming Voltage ProgrammingRange Switching Output On/Off Overvoltage OV ProtectionOVSET? Multiple Output Storage & Recall Overcurrent Protection OCPStatus Reporting Clear CommandASTS? UNR +CCBit Assignment of the Serial Poll Register FAULT?UNMASK? Unmask 2,XXXService Request Generation PON ? SRQ?Reprogramming Delay RQS BitDisplay On/Off Other Queries Front Panel ExplanationResponse Code Code Explanation TEST? ResponsesPage General Local ModeLocal Operation Local Control Of Output FunctionsSetting Current Setting VoltageDisplaying the Contents of the Fault Register Setting Overvoltage ProtectionResetting Overvoltage Protection Resetting Overcurrent ProtectionCondition Setting the Reprogramming DelaySetting the Supplys HP-IB Address Local Control Of System FunctionsRCL Enter Displaying Error MessagesAddr Enter STO EnterPage Test Equipment and Setup Required Calibration ProceduresFigure A-1. Calibration Setup General Calibration Procedure Are not stored. Exercise care when moving the leads Pause Calibration Program10 ! Calibration Example Clear Voltmeter Output BufferInput ANY More Outputs to CALIBRATE? Y or N,X$ Disp END of Calibration ProgramFnend Page Page Programming With a Series 200/300 Computer Path NamesVoltage and Current Programming Voltage and Current Readback Voltage and Current Programming With VariablesPresent Status Programming Power Supply RegistersPrint OUTPUT1 is in CV Mode END if Service Request and Serial PollPrint Overvoltage on Output #2 Enable IntrOFF Intr Print Overvoltage on Output #1Error Detection Stored Operating States Programming Outputs Connected In ParallelInput Enter Operating VOLTAGE,V1 Input Enter Voltage LIMIT,VInput Enter the Desired Current Limit POINT,I Programming Outputs Connected In SeriesCommand Summary Table C-1. Command SummaryCommand Description Table C-l. Command Summary ROM? PON?Previously Test Responses Error Codes and MessagesPower-On Self Test Messages Error Responses Table D-l. Power-On Self Test Error MessageError Code Message Explanation ERR? query ERR key Table D-2. Error ResponsesResponse Code Explanation TEST? query Table D-3. TEST? ResponsesPage Make Changes Manual Backdating6623A Generally Applicable AnnotationsII. CE92 Product Specific Annotations 6621ALatin America Or contactEurope Far East
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