Xantrex Technology XG 850 manual Calibrating the Input Voltage APG Signal, Gain Calibration

Calibration and Troubleshooting

Calibrating the Input Voltage APG Signal

The input voltage APG calibration is necessary to ensure accurate measurements when using the :MEAS:APR? and :MEAS:APR:ISOL? SCPI command queries to monitor the APG input signal.

Gain Calibration

To calibrate the VAP APG input gain:

1.Connect a voltmeter and a DC voltage source to the non-isolated voltage APG input lines (J1.9 and J1.7).

2.Turn the power supply On.

3.Set the Voltage APG level to 4 V.

Send the SCPI command: SYST:COMM:APR:LEV 4

4.Set the input source as Voltage analog APG. Send the SCPI command: SYST:REM:SOUR:VOLT AVOL

5.Set the voltage source attached to the non-isolated voltage APG input to 90% of the nominal voltage level, in this case 3.6 V.

6.Turn the output power on.

7.The power supply starts up in Constant Voltage mode.

8.Read the input voltage value from the voltmeter connected in step 1.

9.Type the SCPI input Voltage calibration command with voltage noted in step 8 as the parameter “data”.

For example, you would type :CAL:INP:ANAL 3.53 if you were reading 3.53 volts from the voltmeter.

Offset Calibration

Offset calibration of the power supply provides the best accuracy in low- range input voltage.

To perform offset calibration:

1.Set the voltage source attached to the non-isolated Voltage APG input to 10% of the nominal voltage level, in this case 0.400 V.

2.Turn on the output power.

3.Read the input voltage value from the voltmeter connected in step 1 of the gain calibration.

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