Agilent Technologies 6811B, 6813B Setting a Protection Feature, Clearing Protection Conditions

Page 49

Front Panel Operation - 4

4 - Setting a Protection Feature

You can set the ac source to disable its output if it detects an overvoltage or overcurrent fault condition. Other automatic fault conditions (such as overtemperature) also will disable the output. Set the

overcurrent protection feature as follows:

 

Action

Display

1.

On the Function keypad, press Protect.

PROT:CLEAR

2.

Press ° to obtain the overcurrent command.

CURR:PROT OFF

3.

On the Entry keypad, press once to scroll to the ON parameter and press Enter. The

CURR:PROT ON

 

OCP annunciator will light, indicating that the overcurrent protection circuit is on.

 

 

CURR:PROT ON

 

 

If you wish to set a time delay between the detection of the fault and the disabling of

DELAY .1

 

the output, scroll to the delay command on the protection menu. The default delay is

 

 

100 milliseconds.

 

Enter the delay from the Entry keypad, such as . 2 5 0 Enter.

4.When you want to restore normal operation after the cause of the overcurrent condition has been removed, scroll to the protection clear command and press Enter. The OCP annunciator then will go off.

DELAY .250 PROT:CLEAR

5 - Clearing Protection Conditions

When the output Prot annunciator is on, the output of the ac source has turned off due to one or more of the following conditions:

Annunciator

OV

OCP

SOA

OT

RI

Rail

Action

Description

overvoltage protection has tripped rms overcurrent protection has tripped safe operating area has tripped overtemperature protection has tripped

an external remote inhibit signal has occurred rail protection has tripped

Bit Number

0

1

2

4

9

11

Bit Weight

1

2

4

16

512

2048

Display

1.You must first identify the cause of the protection shutdown, and then eliminate its cause before you can continue operating the unit.

2.To identify the problem, press Shift Status.

3.Press to obtain the Questionable Event command.

4.Press Enter to find out which bits have been set in the Event Register.

Note: The value returned is the sum of all of the binary weights of the bits that have been set. For example, a value of 20 indicates that bit 2 (bit weight=4) and bit 4 (bit weight=16) have been set. Refer to the previous table for the bits and bit weights that are assigned to the protection conditions. Refer to the following table for information on eliminating the couse of the protection condition. Refer to Chapter 4 in the ac source Programming Guide for a complete discussion of the status system.

*CLS

QUES:EVEN?

QUES:EVEN 20

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Contents User’s Guide AC Power Solutions Agilent Models 6811B, 6812B, and 6813BCertification Warranty InformationGeneral Safety SummarySafety Symbols EMC DeclarationPrinting History Acoustic Noise InformationTable of Contents Entry Keys Examples of Front Panel Programming Performing the Calibration ProcedureIntroduction Performing the Verification TestsLine Voltage Conversion Error Number ListPage Topic Document OrientationLocation Options and Parts Safety ConsiderationsEarlier AC Source Models OptionsOperator Replaceable Parts DescriptionAgilent Part Number Capabilities Front Panel/Remote OperationModel Description Steady-state Output Characteristic in real-time mode Steady-state Output CharacteristicPeak Current Limit Peak Current/Dynamic Power CapabilityPeak Inrush Example Typical Peak Current Output CapacitiesCapacitance in μF 127 254 Ipeak settingVoltage Regulation RMS Current Limit CircuitOutput Impedance Real Time RegulationOutput Coupling Page Inspection CleaningDamage Packaging Material Items SuppliedBench Operation LocationRack Mounting Not block the fan exhaust at the rear of the unitInput Connections Installing the Power CordInput Source and Line Fuse Output Connections Connecting the Power CordRemote Sense Connections Wire ConsiderationsVoltage Drops Current RatingsRemote Sense Connections Digital Connections Trigger ConnectionsRemote Sensing and OVP Considerations Controller 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 KeypadPress Output On/Off Press 1, 2, 0, EnterPress Protect Press 1, 6, 0, EnterSelftest Errors Error MessagesPower-On Selftest Errors Case of TroubleLine Fuse Runtime Error MessagesIndicates May appear at runtimePage Front Panel, Overall View Front Panel DescriptionAC+DC System Keys Dis lay Command FunctionImmediate Action Keys Function KeysScrolling Keys Meter Display Keys Display Command FunctionDisplay Measurement DisplayList Output Control KeysRST Protclear Protection and Status Control KeysCLS Initimmed Trigger and List Control KeysIMM AbortThrough Are used for entering numeric values Is the decimal Entry KeysExamples of Front Panel Programming Setting the Output Voltage AmplitudeSet the output to 120 V rms as follows Setting the DC Offset Setting the Output FrequencyTo verify the output, use the meter menu ActionOvercurrent protection feature as follows Setting a Protection FeatureBit Number Bit Weight Clearing Protection ConditionsPulse Using Transient Voltage ModesPulse Transient Step TransientVoltt Voltm StepVoltm Pulse List TransientWidth DcycleVoltm Fixed List Count Dwel Trigger Delays and Phase SynchronizationDwel EOL Volt Volt EOL Step AutoExample Display Syncsour PhaseSyncphas Initimmed Programming Slew Rates Using Slew Rates to Generate WaveformsSlew Voltm FixedStep Slewm SlewtMeasuring Peak Inrush Current Syncsour Phase SyncphasCurrlev 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 followsTable A-1. Performance Specifications1 SpecificationsTable A-1. Performance Specifications Table A-2. Supplemental Characteristics Supplemental CharacteristicsTrig Out HC TTL output Trig In 10k pullup Table A-3. Operation Below 45 Hz Operation Below 45 HzPage Equipment Required Verification and CalibrationTable B-1. Equipment Required Test SetupRecommended Model Performing the Verification Tests Turn-On Checkout ProcedureAC Voltage Programming and Measurement Accuracy Action Normal ResultRMS Current Accuracy Test DC Voltage Programming and Measurement AccuracyVolt 0, Outpcoup DC, Offset Volt 50, Currrange LOW, CurrlevTable B-3. Agilent 6812B Verification Test Record Table B-2. Agilent 6811B Verification Test RecordDC Programming and Measurement Accuracy RMS Current Measurement AccuracyTable B-4. Agilent 6813B Verification Test Record Table B-3Front Panel Calibration Menu Performing the Calibration ProcedureFront 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 and Entering rms Current Values Calibrating the OVP Trip PointCalibrating the Output Impedance Calibrating and Entering rms Current Measurement ValuesSaving the Calibration Constants OFFCalibration Error Messages Changing the Calibration PasswordTable 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 Table C-1. Error Numbers Error Number ListError Messages Error Messages C Page Check the Power Transformer Connector all Models Check the Jumper Wire Model Agilent 6811B/6812B onlyOpen the Unit Check the Line Jumpers all ModelsFigure D-1. Line Voltage Conversion Components Close the UnitIndex Index Index Canada Australia/New Zealand United States Latin AmericaEurope Asia Pacific JapanManual Updates
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