Calibration and Troubleshooting
Series 2268 850 Watt DC Power Supplies Reference Manual
214
2268S-901-01 Rev. A / January 2015
Offset Calibration
Offset calibration of the power supply provides the best accuracy in low-range input
current.
To perform offset calibration:
1.
Set the voltage source attached to the non-isolated current APG input to 10% of the
nominal current level, in this case 0.400 V.
2.
Turn the output power on.
3.
Read the input voltage value from the voltmeter connected in step 2 of the gain
calibration.
4.
Type SCPI
input current calibration command with voltage noted in step 3 as the
parameter “data”.
For example, you would type
:CAL:INP:ANAL:CURR 0.43
.
After performing offset calibration, it is highly recommended that you repeat gain
calibration.
SCPI Command
[:]CALibration[<channel>]:INPut:ANALog:CURRent{<voltmeter reading in
volts>}
RESTORE FACTORY CALIBRATION
To restore factory calibration, use the SCPI command for returning the power supply to
factory calibration settings.
The SCPI Command (s) for these instructions are:
[:]CALibration:RESTore
RESTORE DEFAULT CALIBRATION
To restore default calibration (unit gain and zero offset for all calibration parameters), use the
SCPI command for returning the power supply to default calibration settings. This can be
useful when recalibrating the unit to a specific load but causes ALL calibration values to
return to default values. All types of calibration must be done to restore the unit to fully
functional condition. It is strongly recommended that the calibration coefficients be saved
before using this command.
The SCPI Command (s) for these instructions are:
[:]CALibration:DEFault
USER DIAGNOSTICS
If your power supply is not performing as described in this Manual, read through the
procedures and checks in this section before calling your service technician. These
procedures are limited to operator level functions only. They do not require cover-off
servicing of the unit.
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