HP 6623A, 6624A, 6621A manual RQS Bit, Reprogramming Delay, Display On/Off

Page 78

Table 5-7 summarizes all the conditions under which a service request will be generated.

Table 5-7 Condition for Generating a Service Request

Condition

Commands Sent

State of

 

PON

SRQ

RQS Bit

∙ Any

0

0

0

∙ Power-on

1

-

1

∙ Error

-

2 or 3

1

∙ Fault

-

1 or 3

1

Reprogramming Delay

The power supply may switch modes or become unregulated momentarily after a new output value is programmed. Because of their short duration, these cases may not ordinarily be considered a fault but the supply will recognize this deviation and generate a fault signal. To prevent this, the reprogramming delay feature is implemented.

Reprogramming delay will delay the onset of certain fault conditions and prevent the power supply from registering a fault when these conditions are true. When the delay is in effect, the CV, + CC, - CC and UNR bits of the status register are masked and cannot communicate with the mask and fault registers and the OCP function. This will prevent the supply from registering a fault should any of these bits become set during the delay period. Reprogramming delay is initiated when any of the following functions are executed:

VSET: ISET: RCL: OVRST: OCRST; OUT on/off

At power-on reprogramming delay is set to 20 mS. You can specify new values between 0 and 32 S in steps of 4 mS. If you specify a value which is not a multiple of 4 mS, the supply will round off the set value to the nearest 4 mS multiple.

To program a new value of 80 mS in output 2 for example, send the following:

DLY 2,.08

If you send a value outside the 0 to 32 S range you will get a programming error. You may use the programming response times in the specifications table to give you an idea of a typical delay setting. However, the appropriate delay setting will also depend on load capacitance, load resistance, and current limit setting. See page 51 for output capacitor considerations.

To query the reprogramming delay setting of a particular output channel, send the following query:

DLY? 2 (using output 2 as an example)

and address the supply to talk. The response will be a numeric value between 0 and 32.

Display On/Off

When the display is on, the commands sent across the HP-IB may experience a slower processing time because the processor must also spend time to monitor the outputs and update the display. You can shorten your command processing time by turning off the display. To turn off the display, send the command:

DSP 0

To re-enable the display send the command:

78 Remote Operation

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Contents Operating Manual HP Part NoCertification Safety Summary Safety Summary Symbol DescriptionDeclaration of Conformity EMCAppendix C--Command Summary Installation ProceduresAppendix A--Calibration Procedure Appendix D--Error MessagesTable Of Contents Remote Operation Local OperationCalibration Command SummaryError Messages Programming With The Series 200/300 ComputerPage Introduction Safety ConsiderationsGeneral Information Instrument and Manual IdentificationAccessories DescriptionOutput Combinations Available Model Basic Operation Output Low Range Values High Range ValuesHP-IB Board Output Boards Specifications Qualifying ConditionsDefinitions Output Response Characteristics Specifications Source EffectSupplemental Characteristics Outputs Low High Voltage Temperature CoefficientAC Input Power and Current Outputs Low High Voltage Programming ResolutionReadback Resolution Command Processing Time see FigureOutput Impedance Safety Agency ComplianceDimensions all models Low Voltage High Voltage 80 W Low VoltageGeneral Information General Information General Information General Information Installation Initial InspectionLocation and Cooling Input Power Requirements Line FuseLine Fuses 100/120 2110-0342 220/240 2110-0055Power Cord Line Voltage ConversionHP-IB Interface Connector Page Front Panel Controls and Indicators Getting StartedTurning On Your Supply LCL key HP-IB Status AnnunciatorsAlphanumeric LCD Power Supply StatusAnnunciators System Control KeysOutput Control Keys Line Switch Numeric Entry KeysNormal Self Test Indications Checking Out Your Supply Using Local Control Sample Self-Test Failure DisplayVoltage Test Overvoltage TestCurrent Test OCP Introduction To Remote OperationIset Enter Enter/Output StatementsReading the HP-IB Address Sending a Remote CommandOutput AddrOften Used Commands Getting Data From The SupplyDisp a Disp a Returning the Supply to Local Mode Output Connections and Operating Information Output RangesProtection Features Operating QuadrantsRange Selection Typical Output Range Characteristics Connecting the Load Page Wire Bundled 10 a 20 a FeetCross Section Meters Area in mm2 Remote Voltage Sensing Multiple LoadsPositive and Negative Voltages Remote Voltage Sensing Remote Sense ConnectionsProgramming Response Time with an Output Capacitor Output Type FormulaOutput Noise Considerations Open Sense LeadsOvervoltage Trigger Connections External Trigger CircuitEquivalent Internal OV Trigger Circuit Power Supply Protection Considerations Battery ChargingParallel Operation Maximum Allowable Voltage Setting CV OperationCC Operation Remote SensingSeries Operation 13. Series Connections with Local Sensing CV OperationSpecifications for Series Operation 14. Series Connections with Remote SensingPage 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 Iset Fault ?Vset OvsetPage Power Supply Commands Initial ConditionsVoltage Programming Current ProgrammingRange Switching Output On/Off Overvoltage OV ProtectionOVSET? Overcurrent Protection OCP Multiple Output Storage & RecallClear Command Status ReportingUNR +CC ASTS? Unmask 2,XXX FAULT? UNMASK? Bit Assignment of the Serial Poll RegisterService Request Generation SRQ? PON ?Reprogramming Delay RQS BitDisplay On/Off Other Queries Front Panel ExplanationResponse Code TEST? Responses Code ExplanationPage Local Control Of Output Functions Local ModeLocal Operation GeneralSetting Voltage Setting CurrentResetting Overcurrent Protection Setting Overvoltage ProtectionResetting Overvoltage Protection Displaying the Contents of the Fault RegisterLocal Control Of System Functions Setting the Reprogramming DelaySetting the Supplys HP-IB Address ConditionSTO Enter Displaying Error MessagesAddr Enter RCL EnterPage Calibration Procedures Test Equipment and Setup RequiredFigure A-1. Calibration Setup General Calibration Procedure Are not stored. Exercise care when moving the leads Clear Voltmeter Output Buffer Calibration Program10 ! Calibration Example PauseInput 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 Programming With Variables Voltage and Current ReadbackService Request and Serial Poll Programming Power Supply RegistersPrint OUTPUT1 is in CV Mode END if Present StatusPrint Overvoltage on Output #1 Enable IntrOFF Intr Print Overvoltage on Output #2Error Detection Programming Outputs Connected In Parallel Stored Operating StatesInput Enter Voltage LIMIT,V Input Enter Operating VOLTAGE,V1Programming Outputs Connected In Series Input Enter the Desired Current Limit POINT,ICommand Summary Table C-1. Command SummaryCommand Description Table C-l. Command Summary PON? ROM?Previously Table D-l. Power-On Self Test Error Message Error Codes and MessagesPower-On Self Test Messages Error Responses Test ResponsesTable D-2. Error Responses Error Code Message Explanation ERR? query ERR keyTable D-3. TEST? Responses Response Code Explanation TEST? queryPage Manual Backdating Make Changes6621A Generally Applicable AnnotationsII. CE92 Product Specific Annotations 6623AFar East Or contactEurope Latin America
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