Calibration and Troubleshooting
6-8
M370046-01
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
and the actual current measured was 0.50A.
After performing offset calibration, it is highly recommended that you
repeat gain calibration.
SCPI Command
[:]
CALibration[<channel>]:OUTPut:CURRent{<ammeter
reading in amps>}
Important:
For best results, both calibrations may be repeated several times.
To maintain the high current accuracy of the XTR series of power supplies, user
current calibration should only be done with a high accuracy calibrated shunt
resistor of at least 0.025% tolerance.
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