Xantrex Technology XG 850 manual Calibrating the Output Voltage, To perform gain calibration

Calibration and Troubleshooting

Calibrating the Output Voltage

Gain calibration of the power supply has the greatest affect on the accuracy in the high voltage range. Offset calibration has the greatest affect on accuracy of the power supply at low voltages. The same calibration command is used for the gain and offset calibrations. The type of calibration is determined internally by the XG depending on if the set point is above 10% of the maximum output voltage value or not. If it is above 10% of the maximum voltage, the calibration is a gain calibration; if is below 10%, it is an offset calibration.

Gain Calibration

To perform gain calibration:

1.Disconnect the power supply from the load.

2.Connect the output terminals to a precision voltmeter.

3.Turn both the power supply and the voltmeter to On.

4.Set the current set point to maximum. Set the supply output to 90% of the nominal voltage level.

5.Turn on the output power.

6.Read the voltage value on voltmeter display.

7.Type the SCPI command with voltage value as parameter “data”.

For example, type :CAL:OUTP 138.3 if you had an XG 150-5.6 calibrating with the voltage set point set to 135 V and the voltmeter was reading 138.3 volts

Offset Calibration

To perform offset calibration:

1.After performing gain calibration, set the programmed voltage 10% from nominal.

2.Read the voltage value on the voltmeter display.

3.Type the SCPI command with voltage value as parameter “data”.

For example, you would type :CAL:OUTP12.3 if you had an XG 150-5.6 calibration with the voltage set point set to 10V and the voltmeter was reading 12.3 volts.

6-6 M370078-01