Xantrex Technology GPIB-XPD manual Current Mode Calibration, Current Calibration Setup

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Calibration

Current Mode Calibration

Current Mode Calibration

Current

Calibration

Setup

1.Disconnect the load from the power supply to be calibrated.

2.Connect a shunt across the supply's output terminals.

3.Connect a voltmeter across the shunt.

Power Supply	Power Supply
Positive Output	Negative Output

Current Sensing

Resistor

Current

Program

Calibration

Procedure

+V -

VOLTMETER

Figure 4.2 Current Calibration Setup

1.Connect the shunt and voltmeter to the power supply as shown in Figure 4.2.

2.Activate calibration mode by sending command CMODE ON or CMODE 1 to the power supply.

3.Send command ILO; VLO to the power supply. Measure and record the output shown on the external voltmeter.

4.Send command IHI; VHI to the supply Measure and record the output voltage shown on the external voltmeter.

5.Calculate ILO and IHI from the voltages read from the external voltmeter and the shunt resistance. I=V/R.

6.Send the command IDATA <ilo>,<ihi> to the power supply. <ilo> and <ihi> are the current values obtained from sending the ILO and IHI commands to the power supply. When the power supply is calibrated, the low to high current program calibration values are stored as constants.

7.Program the supply at various levels using the ISET command to confirm that the calibration was successful and that linearity is observed. Refer to the current program accuracy specification in Section 1.

8.Turn off calibration mode by sending the command CMODE OFF or CMODE 0 to the power supply.

52	Operating Manual for GPIB for XPD Series Power Supply

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Contents GPIB-XPD Page Internal Gpib Interface for XPD 500 Watt Series How do you get service? Phone 604 422 Toll Free North America 800 667 Fax 604 421What does this warranty not cover? Disclaimer Product Information About Your Power Supply Model Number Serial Number Purchased From Purchase DateSafety SupplyInstallation and Configuration Main SectionsManual Revisions About This Manual Contents Contents Features and Specifications DescriptionFunctions Features and FunctionsFeatures and Specifications ReadbackSpecifications Models 18-30 33-16 60-9 120-4.5OVP Features and Specifications Introduction Initial InspectionPower Supply Front Panel with Gpib Interface Installed Gpib Interface Subplate Located on Power Supply Rear Panel Gpib Interface PCB Basic Setup Procedure Step # Description Action ReferencePON SRQ IEEE-488 Primary Address Selection AddressPower On Service Request PON SRQ Rear Panel SRQ Switch Position PON SRQ StateSwitch Position Power on results Condition Default Settings Model Example IsetIEEE-488 Controller Connection Internal PCB Jumper SelectionsOVP Control Mode Selection User Signals High OFF LOWHigh LOW OFF User Signals J21 Connector J21 User Signal Connector Circuit Block Diagram J21 User Cable with Ferrite Block Operation Gpib OperationExample Command directed to entire bus, or Power On PON Set when unit Bit Decimal Description Reset By Position WeightRequest Service SRQ Set when LSBCommand Syntax Computer EntryFormat Description Form Floating Number Definition ExampleIset 2.0A Vset Command Summary CMODE? AUXA?AUXB? DLY?Idata FAULT?Cmode IHIAuxa 1 on Command ReferenceCommand Description Auxb 1 onChanging an output setting Response Fold mode where mode is Snsp Mask None = Unmask ALLStatus, and Fault Registers on Accumulated Status, Status, and Fault Registers on SNSP, ALL, NoneResponse Vmax voltage Accumulated Status, Status, and Fault Registers Condition Mnemonic Bit Position Bit WeightError Codes 11 Error CodesTroubleshooting LEDsCalibration Voltage Program Calibration Procedure Readback Voltage Mode CalibrationSetup VoltageCalibration Current Mode Calibration Current Calibration SetupCurrent Program Calibration Procedure Current Readback Calibration Procedure Over Voltage Protection OVP Calibration Page Xantrex Technology Inc