Agilent Technologies N3280A manual Triggering Output Changes, Oscillation Protection

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Programming the DC Source - 5

Oscillation Protection

Oscillation protection is a built in function that shuts down the output in about 10 milliseconds if a persistent and severe oscillation condition is detected. Oscillation protection can be enabled or disabled using the following command:

OUTP:OSCP <bool>,(@<channel list>) where <bool> is the protection state (0 OFF 1 ON).

If the output of your unit is being shut down by the oscillation protection circuit, you can reprogram the output compensation bandwidth to try and eliminate the oscillation. This can be especially effective if capacitive loads or long load leads are causing the output to oscillate. You can program the output compensation to operate in a lower bandwidth using the following command:

VOLT:ALC:BWID <n>,(@<channel list>) where <n> is one of 3 bands (30000 20000 10000)

If your unit is being operated in current limit, your can select from one of two compensation bands using the following command:

CURR:LIM:BWID <n>,(@<channel list>) where <n> is one of 2 bands (30000 10000)

NOTE: If the output is on, programming a different compensation band will cause the output to cycle OFF, then ON.

Triggering Output Changes

The dc source has two independent trigger systems. One is used for triggering output changes, and the other is used for triggering measurements. This section describes the output trigger system. The measurement trigger system is described under "Triggering Measurements". Briefly, to generate an output trigger:

1Program the triggered output level (voltage, current , or current limit)

2Set the triggered function mode to STEP

3Initiate the trigger system

Output Trigger Model

Figure 5-1 is a model of the output trigger system. The rectangular boxes represent states. Arrows show the transitions between states. Arrows are labeled with the event that causes the transition to occur.

 

 

 

ABOR

IDLE STATE

 

 

 

 

*RST

 

 

 

 

 

INITiate:NAME TRAN

INITIATED STATE

TRIGGER RECEIVED

OUTPUT CHANGES

Figure 5-1. Model of Output Trigger System

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Contents Agilent Technologies Model N3280A Component Test DC Source USER’S GuideCertification Warranty InformationGeneral Safety SummarySafety Symbols Declaration Printing History Acoustic Noise InformationTable of Contents Scpi Command Completion Using Device Clear Types of Scpi CommandsExternal References Gpib Capabilities of the DC Source Introduction to ScpiMeasurement Commands Scpi Programming Commands At a Glance Calibration CommandsOutput Commands Status CommandsTrigger Commands System CommandsCommon Commands Voltage Priority TestsTransient Response Tests Error Number List 103Ripple and Noise Tests Page Document Orientation Safety ConsiderationsDescription Options and AccessoriesRemote Programming Option DescriptionVoltage Priority Operation Output CharacteristicsCurrent Priority Operation Output Characteristic Current PriorityMeasurement Characteristics Start of a Measurement Inspection CleaningDamage Packaging Material Additional ItemsBench Operation LocationRack Mounting Do not block the fan exhaust at the rear of the unitConnect the Power Cord Power ConnectionsOutputs 1 Turn the unit off before connecting any wiresOutput Connections Voltage Drops and Lead Resistance Current RatingsAmpacity and Resistance of Stranded Copper Conductors AWG No Maximum Ampacity Resistance at 20 deg. C Free airGuard Connections for Test Fixtures Coaxial Guard ConnectionsComputer Connections External Trigger ConnectionsMaintaining Stability OVP ConsiderationsSwitch Setting Settings for Power Module Configuration SwitchSwitch Setting Address Gpib AddressFront Panel Description Explanation Checkout ProcedureProcedure Runtime Error Messages Selftest Error MessagesPower-On Selftest Errors Case of TroublePage Gpib Capabilities of the DC Source External ReferencesGpib References Scpi ReferencesConventions Used in This Guide Types of Scpi CommandsIntroduction to Scpi Including Common Commands Multiple Commands in a MessageUsing Queries Moving Among SubsystemsChannel List Parameter Types of Scpi MessagesMessage Unit Scpi Data Formats Suffixes and Multipliers Scpi Command CompletionResponse Data Types Class Suffix Unit Unit with MultiplierOutputstate Example Using Device ClearPage Introduction Power-on InitializationProgramming the Output Enabling the OutputOutput Current Output ModeOvervoltage Protection Output Trigger Model Triggering Output ChangesOscillation Protection Selecting the Output Trigger Source Setting the Voltage and Current Trigger LevelsEnabling the Output Trigger System Average Measurements Making MeasurementsGenerating Output Triggers Measurement Samples and Time Interval Power Line CyclesCurrent Ranges Triggered MeasurementsWindow Functions Returning All Measurement Data From the Data BufferSelecting the Measurement Trigger Source Measurement Trigger ModelEnabling the Measurement Trigger System Generating Measurement Triggers Output Settling DelaySelecting the Sensing Function Pre-trigger and Post-trigger Acquisition Pre-trigger and Post-trigger Data AcquisitionDC Source Status Model Programming the Status RegistersOperation Status Group Bit Configurations of Status RegistersStandard Event Status Group Questionable Status GroupStatus Byte Register MSS and RQS BitsServicing Operation Status and Questionable Status Events Determining the Cause of a Service InterruptProgramming Parameters Subsystem CommandsCommon Commands Save new cal constants in non-volatile memory Scpi Programming Commands At a GlanceSubsystem Commands Syntax FUNCtion Mode mode, @list VOLTage Mode mode, @list DELaySets the output voltage in voltage priority mode Sets the triggered output voltage in voltage priority modeESE n Common Commands SyntaxSRE n Output Programming ParametersCALibrateCURRent Calibration CommandsCALibrateCURRentLIMitPOSitive CALibrateCURRentLIMitNEGative CALibrateCURRentMEASureCALibrateDATA CALibratePASSwordCALibrateDATE CALibrateLEVelCALibrateVOLTage CALibrateSAVECALibrateSTATe FETChARRayCURRent? FETChARRayVOLTage? Measurement CommandsFETChCURRent? FETChVOLTage? Query SyntaxMEASureCURRent? MEASureVOLTage? MEASureARRayCURRent? MEASureARRayVOLTage?SENSeCURRentRANGe Enter values greater than 0.015ASENSeSWEepNPLCycles SENSeFUNCtionSENSeSWEepOFFSetPOINts Query Syntax SENSeFUNCtion? @channel listSENSeWINDow SENSeSWEepPOINtsSENSeSWEepTINTerval OUTPut Output CommandsOUTPutOSCProtect OUTPutPROTectionCLEarSOURceCURRentIMMediate SOURceCURRentTRIGgered Default SuffixSOURceCURRentLIMitIMMediate SOURceCURRentLIMitTRIGgered SOURceCURRentLIMitBWIDthSOURceCURRentMODE SOURceCURRentLIMitMODE SOURceDELaySOURceDELayMODE SOURceVOLTageALCBWIDth SOURceFUNCtionMODESOURceVOLTageIMMediate SOURceVOLTageTRIGgered Query Syntax SOURceFUNCMODE? @channel listSOURceVOLTagePROTectionSTATe SOURceVOLTageMODEQuery Syntax SOURceVOLTagePROTectionSTATe? @channel list NR10 orSTATusOPERationENABle Status CommandsBit Configuration of Operation Status Registers STATusOPERationEVENt?Parameters Preset Value STATusPRESetCommand Syntax STATusPRESet Parameters None Examples STATusOPERationNTR STATusOPERationPTRQuery Syntax STATusQUEStionableENABle? @channel list STATusQUEStionableENABleSTATusQUEStionableCONDition? STATusQUEStionableNTR STATusQUEStionablePTRSYSTemVERSion? System CommandsSYSTemERRor? ABORt Trigger CommandsINITiateNAME TRIGgerACQuireTRIGgerTRANsientSOURce TRIGgerACQuireSOURceTRIGgerTRANsient RST ValueCommand Syntax *CLS Parameters None Common CommandsParameters Power-On Value Examples Bit Configuration of Standard Event Status Enable RegisterQuery Syntax *OPT? Returned Parameters Aard Field InformationExample RST Settings Power-on ValueQuery Syntax TST? Returned Parameters NR1 Bit Configuration of Status Byte RegisterTable A-1. Specifications Table A-2 Supplemental Characteristics Safety Output Common ModeDimensions WeightFigure A-1. Output Impedance Graphs all outputs Equipment Required Measurement Techniques Performance & Verification TestsProgramming Test SetupElectronic Load Voltage Priority Tests Program CommandsVoltage Programming and Readback Accuracy Positive Current Limit +CLNegative Current Limit -CL Action Program CommandsCurrent Programming and Readback Accuracy Current Priority TestsVoltage Priority, Constant Voltage Load Effect Load Effect TestsVoltage Priority, -Current Limit Load Effect Test Voltage Priority, +Current Limit Load EffectVoltage Priority, Constant Voltage Source Effect Source Effect TestsCurrent Priority Constant Current Test Voltage Priority, -Current Limit Source Effect Voltage Priority, +Current Limit Source EffectCurrent Priority, Constant Current Source Effect Voltage Priority Ripple and Noise Ripple and Noise TestsCurrent Priority Ripple and Noise Voltage Priority, Transient Recovery TimeTransient Response Tests Figure B-2. Transient Waveform Voltage Priority Current Priority Transient Recovery TimeFigure B-3. Transient Waveform Current Priority Performance Test Equipment FormPerformance Test Record Form Enable Calibration Mode Performing the Calibration ProcedurePositive Current Limit Calibration Negative Current Limit Calibration5A Range Current Measurement Calibration 100101 15mA Range Current Measurement CalibrationSaving the Calibration Constants Calibration Error Messages Changing the Calibration PasswordTable B-3. Gpib Calibration Error Messages Error Meaning103 Error Number ListTable C-1. Error Numbers 104 Error Messages105 Error Messages CPage 107 Line Voltage SelectionPage Mating Connector Part Numbers Earlier Version Output ConnectorsRear Panel Pinout Assignments CHG-2010-J01010-KEPPage 111 Index112 IndexScpi 113114 Canada Australia/New Zealand United States Latin AmericaEurope Asia Pacific JapanManual Updates
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