Xantrex Technology XTR 850 Watt - Manual (Page 194)

Calibration and Troubleshooting
6-6 975-0200-01-01
The SCPI Command (s) for these instructions are:
[:]CALibration[]:OUTPut{:VOLTage]{
reading in volts>}
Calibrating the Output Current
Gain Calibration
To perform gain calibration:
1. Disconnect the power supply from the load.
2. Connect the output terminals to a load representing a short circuit
using a precision ammeter.
3. Turn both the power supply and the load On.
4. Set the nominal level to 90% of nominal current level.
5. Turn on the output power.
6. The power supply starts up in Constant Current mode.
7. Read the current value on the ammeter display.
8. Type SCPI command with current value as parameter “data”.
For example, you would type :CAL:OUTP:CURR 5.57 if you had
an XTR 150-5.6 calibrating with the current set point set to 5.6 A.
Offset Calibration
Offset calibration of the power supply provides the best accuracy in low-
range current.
To perform offset calibration:
1. After performing gain calibration, set the current to 10% from the
nominal.
2. Read the current value on the ammeter display.
3. Type SCPI command with the current value as parameter "data".
For example, you would type :CAL:OUTP:CURR 0.50 if you had
an XTR 150-5.6 calibrating with the current set point set to 0.56 A.
Important: For best results, both calibrations may be repeated several
times.