Power Line Cycles | Agilent Technologies N3280A guide

5 - Programming the DC Source

Power Line Cycles

After a power-on or *RST, the dc source automatically makes measurements based on a 0.00912 power line cycles (for 60 Hz line). This results in a default measurement sample of 5 points separated by 30.4 microsecond time intervals. The easiest way to increase the data acquisition time is to increase the number of power line cycles in the measurement. By doing this the unit automatically sets the sweep time interval, sweep offset, and sweep points, based on sampling the maximum number of points to provide the best noise filtering.

To change the power line cycles on which a measurement is based, use:

SENS:SWE:NPLC <n>

If your load does not draw currents with a significant noise component, use a setting of 0.00912 PLC for fast measurements. Use a setting of 1 PLC to achieve full accuracy on the 0.5mA current range.

Measurement Samples and Time Interval

You can vary both the number of data points in a measurement sample, as well as the time between samples. This is illustrated in figure 5-2.

SENS:SWE:TINT<time>

SENS:SWE:POIN<#of points>

Figure 5-2. Commands that Control Measurement Time

When the instrument is turned on and at *RST, the output voltage or current sampling rate is 30.4 microseconds, and the sweep size is set to 5 data points. This means that it takes about 152 microseconds per measurement. You can vary this data sampling rate with:

SENS:SWE:TINT <sample period>

SENS:SWE:POIN <points>

For example, to set the time interval to 60.8 microseconds per measurement with 1500 samples, use

SENS:SWE:TINT 60.8E-6;POIN 1500.

Note that increasing the number of sample points increases the accuracy of the measurement; however, the tradeoff is it takes a longer time to make the measurement.

NOTE: The total number of data points cannot exceed 4096. This means that the count multiplied by the points in each measurement cannot exceed 4096; otherwise an error will occur.

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Agilent Technologies N3280A manual Power Line Cycles, Measurement Samples and Time Interval

Contents

USER’S Guide Agilent Technologies Model N3280A Component Test DC Source Warranty Information Certification Safety Summary General Safety Symbols Declaration Acoustic Noise Information Printing History Table of Contents Types of Scpi Commands Scpi Command Completion Using Device ClearExternal References Gpib Capabilities of the DC Source Introduction to Scpi Scpi Programming Commands At a Glance Calibration Commands Measurement CommandsOutput Commands Status Commands System Commands Trigger CommandsCommon Commands Voltage Priority Tests Transient Response Tests Error Number List 103Ripple and Noise Tests Page Safety Considerations Document Orientation Options and Accessories DescriptionRemote Programming Option Description Output Characteristics Voltage Priority Operation Output Characteristic Current Priority Current Priority Operation Measurement Characteristics Start of a Measurement Cleaning InspectionDamage Packaging Material Additional Items Location Bench OperationRack Mounting Do not block the fan exhaust at the rear of the unit Power Connections Connect the Power Cord Outputs 1 Turn the unit off before connecting any wiresOutput Connections Current Ratings Voltage Drops and Lead ResistanceAmpacity and Resistance of Stranded Copper Conductors AWG No Maximum Ampacity Resistance at 20 deg. C Free air Coaxial Guard Connections Guard Connections for Test Fixtures External Trigger Connections Computer ConnectionsMaintaining Stability OVP Considerations Settings for Power Module Configuration Switch Switch SettingSwitch Setting Address Gpib Address Front Panel Description Explanation Checkout ProcedureProcedure Selftest Error Messages Runtime Error MessagesPower-On Selftest Errors Case of TroublePage External References Gpib Capabilities of the DC SourceGpib References Scpi References Conventions Used in This Guide Types of Scpi CommandsIntroduction to Scpi Multiple Commands in a Message Including Common CommandsUsing Queries Moving Among Subsystems Channel List Parameter Types of Scpi MessagesMessage Unit Scpi Data Formats Scpi Command Completion Suffixes and MultipliersResponse Data Types Class Suffix Unit Unit with Multiplier Using Device Clear Outputstate ExamplePage Power-on Initialization IntroductionProgramming the Output Enabling the Output Output 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 Power Line Cycles Measurement Samples and Time Interval Triggered Measurements Current RangesWindow Functions Returning All Measurement Data From the Data Buffer Selecting 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 Data Acquisition Pre-trigger and Post-trigger Acquisition Programming the Status Registers DC Source Status Model Bit Configurations of Status Registers Operation Status Group Questionable Status Group Standard Event Status GroupStatus Byte Register MSS and RQS Bits Determining the Cause of a Service Interrupt Servicing Operation Status and Questionable Status Events Programming Parameters Subsystem CommandsCommon Commands Save new cal constants in non-volatile memory Scpi Programming Commands At a GlanceSubsystem Commands Syntax Mode mode, @list DELay FUNCtion Mode mode, @list VOLTageSets the output voltage in voltage priority mode Sets the triggered output voltage in voltage priority mode Common Commands Syntax ESE nSRE n Output Programming Parameters Calibration Commands CALibrateCURRentCALibrateCURRentLIMitPOSitive CALibrateCURRentLIMitNEGative CALibrateCURRentMEASure CALibratePASSword CALibrateDATACALibrateDATE CALibrateLEVel CALibrateVOLTage CALibrateSAVECALibrateSTATe Measurement Commands FETChARRayCURRent? FETChARRayVOLTage?FETChCURRent? FETChVOLTage? Query Syntax MEASureARRayCURRent? MEASureARRayVOLTage? MEASureCURRent? MEASureVOLTage?SENSeCURRentRANGe Enter values greater than 0.015A SENSeFUNCtion SENSeSWEepNPLCyclesSENSeSWEepOFFSetPOINts Query Syntax SENSeFUNCtion? @channel list SENSeWINDow SENSeSWEepPOINtsSENSeSWEepTINTerval Output Commands OUTPutOUTPutOSCProtect OUTPutPROTectionCLEar Default Suffix SOURceCURRentIMMediate SOURceCURRentTRIGgeredSOURceCURRentLIMitIMMediate SOURceCURRentLIMitTRIGgered SOURceCURRentLIMitBWIDth SOURceCURRentMODE SOURceCURRentLIMitMODE SOURceDELaySOURceDELayMODE SOURceFUNCtionMODE SOURceVOLTageALCBWIDthSOURceVOLTageIMMediate SOURceVOLTageTRIGgered Query Syntax SOURceFUNCMODE? @channel list SOURceVOLTageMODE SOURceVOLTagePROTectionSTATeQuery Syntax SOURceVOLTagePROTectionSTATe? @channel list NR10 or Status Commands STATusOPERationENABleBit Configuration of Operation Status Registers STATusOPERationEVENt? STATusPRESet Parameters Preset ValueCommand Syntax STATusPRESet Parameters None Examples STATusOPERationNTR STATusOPERationPTR STATusQUEStionableENABle Query Syntax STATusQUEStionableENABle? @channel listSTATusQUEStionableCONDition? STATusQUEStionableNTR STATusQUEStionablePTR SYSTemVERSion? System CommandsSYSTemERRor? Trigger Commands ABORtINITiateNAME TRIGgerACQuire TRIGgerACQuireSOURce TRIGgerTRANsientSOURceTRIGgerTRANsient RST Value Common Commands Command Syntax *CLS Parameters NoneParameters Power-On Value Examples Bit Configuration of Standard Event Status Enable Register Query Syntax *OPT? Returned Parameters Aard Field InformationExample Power-on Value RST Settings Bit Configuration of Status Byte Register Query Syntax TST? Returned Parameters NR1 Table A-1. Specifications Table A-2 Supplemental Characteristics Output Common Mode SafetyDimensions Weight Figure A-1. Output Impedance Graphs all outputs Equipment Required Performance & Verification Tests Measurement Techniques Programming Test SetupElectronic Load Program Commands Voltage Priority TestsVoltage Programming and Readback Accuracy Positive Current Limit +CL Action Program Commands Negative Current Limit -CL Current Priority Tests Current Programming and Readback Accuracy Load Effect Tests Voltage Priority, Constant Voltage Load Effect Voltage Priority, +Current Limit Load Effect Voltage Priority, -Current Limit Load Effect Test Voltage Priority, Constant Voltage Source Effect Source Effect TestsCurrent Priority Constant Current Test Voltage Priority, +Current Limit Source Effect Voltage Priority, -Current Limit Source Effect Current Priority, Constant Current Source Effect Ripple and Noise Tests Voltage Priority Ripple and Noise Current Priority Ripple and Noise Voltage Priority, Transient Recovery TimeTransient Response Tests Current Priority Transient Recovery Time Figure B-2. Transient Waveform Voltage Priority Performance Test Equipment Form Figure B-3. Transient Waveform Current Priority Performance Test Record Form Performing the Calibration Procedure Enable Calibration Mode Negative Current Limit Calibration Positive Current Limit Calibration5A Range Current Measurement Calibration 100 101 15mA Range Current Measurement CalibrationSaving the Calibration Constants Changing the Calibration Password Calibration Error MessagesTable B-3. Gpib Calibration Error Messages Error Meaning 103 Error Number ListTable C-1. Error Numbers Error Messages 104 Error Messages C 105Page Line Voltage Selection 107Page Earlier Version Output Connectors Mating Connector Part NumbersRear Panel Pinout Assignments CHG-2010-J01010-KEPPage Index 111 Index 112 113 Scpi 114 United States Latin America Canada Australia/New ZealandEurope Asia Pacific Japan Manual Updates