Keithley 2500, Service Manual

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B-8 Calibration Reference Model 2500 Service Manual
:OFFSet
(:CALibration:PROTected:SOURce[1]:OFFSet)
(:CALibration:PROTected:SOURce2:OFFSet)
Purpose
To calibrate the channel 1 or channel 2 input voltage offset.
Format
:cal:prot:sour1:offs
:cal:prot:sour2:offs
Description The :CAL:PROT:SOUR1:OFFS and :CAL:PROT:SOUR2:OFFS com-
mands calibrate the channel 1 or channel 2 input voltage offset respec-
tively. A triax shielding cap should be installed on the corresponding
INPUT jack during these calibration steps.
Example
:CAL:PROT:SOUR2:OFFS
Calibrate channel 2 input voltage offset.
Detecting calibration errors
If an error occurs during any calibration step, the Model 2500 will generate an appropriate
error message. Several methods to detect calibration errors are discussed below.
Reading the error queue
As with other Model 2500 errors, any calibration errors will be reported in the error queue.
(You can read the error queue by using the :SYST:ERR? query.)
Error summary
Table B-2 summarizes calibration errors.
Table B-2
Calibration errors
Error number Error message
+500 “Date of calibration not set”
+501 “Next date of calibration not set”
+502 “Calibration data invalid”
+509 “Not permitted with cal locked”
+510 “Not permitted with cal unlocked”
+520 “ gain data invalid”
+521 “ offset data invalid”
+522 “Source - gain data invalid”
+523 “Source - offset data invalid”
+524 “Source DAC Overflow”
+525 “Source DAC Underflow”