Series 2268 850 Watt DC Power Supplies Reference Manual
Calibration and Troubleshooting
2268S-901-01 Rev. A / January 2015
213
SCPI Command
[:]CALibration[<channel>]:INPut:ANALog[:VOLTage] {<voltmeter reading in
volts>}
Calibrating the Input Current 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 CAP APG input gain calibration:
1.
Connect a short across the power supply output.
2.
Connect a voltmeter and a DC voltage source to the non-isolated current APG
input lines (J1.10 and J1.7).
3.
Turn the power supply On.
4.
Set the Current APG level to 4 V. Send the SCPI command:
SYST:COMM:APR:LEV:CURR 4
5.
Set the input source as Voltage analog APG. Send the SCPI command:
SYST:REM:
SOUR:CURR
AVOL
6.
Set the voltage source attached to the non-isolated current APG input to 90% of the
nominal current level, in this case 3.6 V.
7.
Turn the output power on.
8.
The power supply starts up in Constant Current mode.
9.
Read the input voltage value from the voltmeter connected in step 2.
10.
Type the SCPI input current calibration command with voltage noted in step 9 as
the parameter “data”.
For example, you would type :CAL:INP:ANAL:CURR 3.49 if you were reading 3.49
volts from the voltmeter.
Summary of Contents for Keithley 2268 Series
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