Keithley 2520, Service Manual, Page: 38 / 137

2-8 Calibration Model 2520 Pulsed Laser Diode Test System Service Manual
Changing the password
The default password (002520) 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, choose CAL, and press ENTER. The instrument will display
the following:
CALIBRATION
UNLOCK EXECUTE VIEW-DATES
䊳
SAVE LOCK CHANGE-PASSWORD
2. Select UNLOCK, then enter the password. (Default: 002520.)
3. Select CHANGE-PASSWORD, and then press ENTER. The instrument will
display the following:
New Pwd: 002520
Use ,
䊳
, , , ENTER or EXIT.
4. Using the EDIT 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 'KI002520' remote default to 'KICAL':
:CAL:PROT:CODE 'KI002520'
:CAL:PROT:CODE 'KICAL'
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 (002520, front panel; KI002520, remote).
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.