Keithley 2500, Service Manual

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2-8 Calibration Model 2500 Service Manual
Calibration errors
The Model 2500 checks for errors after each calibration step, minimizing the possibility
that improper calibration may occur due to operator error.
Front panel error reporting
If an error is detected during comprehensive calibration, the instrument will display an
appropriate error message (see Appendix B). The unit will then prompt you to repeat the
calibration step that caused the error.
Remote error reporting
You can detect errors while in remote by testing the state of EAV (Error Available) bit
(bit 2) in the status byte. (Use the *STB? query to request the status byte.) Query the
instrument for the type of error by using the :SYST:ERR? query. The Model 2500 will
respond with the error number and a text message describing the nature of the error. See
Appendix B for details.
Aborting calibration steps
To abort a calibration step from the front panel, press the EXIT key. To abort a calibration
step via remote, send the :ABORt command.
Front panel calibration
The front panel calibration procedure described below calibrates all functions. Note that
each function and range is separately calibrated, and the procedure must be performed in
the order shown.
Step 1. Prepare the Model 2500 for calibration
1. Turn on the Model 2500 and the calibration equipment, and allow them to warm up
for at least one hour before performing calibration.
2. Press the MENU key, then choose CAL, and press ENTER. Select UNLOCK and
then press ENTER. The instrument will display the following:
PASSWORD:
Use , , , , ENTER or EXIT.