Keithley SourceMeter 3A 2420, Service Manual

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2-6 Calibration
Changing the password
The default password may be changed from the front panel or via remote as discussed below.
Changing the password from the front panel
Follow the steps below to change the password from the front panel:
1. Press the MENU key, then choose CAL and press ENTER. The instrument will display
the following:
CALIBRATION
UNLOCK EXECUTE VIEW-DATES
SAVE LOCK CHANGE-PASSWORD
2. Select UNLOCK, then enter the password. (Default: 002420.)
3. Select CHANGE-PASSWORD, and then press ENTER. The instrument will display the
following:
New Pwd: 002420
Use , , , , ENTER or EXIT.
4. Using the range keys, and the left and right arrow keys, enter the new password on the
display.
5. Once the desired password is displayed, press the ENTER key to store the new password.
Changing the password by remote
To change the calibration password by remote, first send the present password, and then send
the new password. For example, the following command sequence changes the password from
the 'KI002420' remote default to 'KI_CAL':
:CAL:PROT:CODE 'KI002420'
:CAL:PROT:CODE 'KI_CAL'
You can use any combination of letters and numbers up to a maximum of eight characters.
NOTE 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 password
If you lose the calibration password, 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 (KI002420).
See Section 5 for details on disassembling the unit to access the CAL pads. Refer to the dis-
play board component layout drawing at the end of Section 6 for the location of the CAL pads.