Keithley 2182, Service Manual, Page: 30 / 120

5. Use the up and down RANGE keys to toggle between Y (yes) and N (no). Choose N if
you do not want to change the code. Choose Y if you want to change the code. The unit
then prompts you to enter a new code. Enter the code, and press ENTER.
Remote code
To unlock calibration via remote, send the following command:
:CAL:PROT:CODE '<code>'
For example, the following command uses the default code:
:CAL:PROT:CODE 'KI002182'
NOTE To change the calibration code, first sent the present code, then send the new code. If
you change the first two characters of the password to something other than "KI", you
will not be able to unlock calibration from the front panel.
Resetting the calibration code
If you lose the calibration code, you can unlock calibration by shorting together the CAL
pads, which are located on the display board. Doing so will also reset the password to the factory
default (KI002182).
See Section 5 for details on disassembling the unit to access the CAL pads. Refer to the
display board component layout drawing at the end of Section 6 for the location of the CAL
pads.
Calibration errors
The Model 2182 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. If a calibration step fails, error +500 (calibration data
invalid) will occur. The calibration step must be repeated.
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 2182 will respond with the error
number and a text message describing the nature of the error. See
Appendix B for details.
Calibration 2-5