Unlocking Calibration; Unlocking Calibration From The Front Panel - Keithley 2425 Service Manual

Model 2425 Service Manual

Unlocking calibration

Before performing calibration, you must first unlock calibration by entering or sending the
calibration password as explained in the following paragraphs.

Unlocking calibration from the front panel

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NOTE
Press the MENU key, then choose CAL, and press ENTER. The instrument will
display the following:
CALIBRATION
UNLOCK EXECUTE VIEW-DATES
3 SAVE LOCK CHANGE-PASSWORD
Select UNLOCK, then press ENTER. The instrument will display the following:
PASSWORD:
Use , ENTER or EXIT.
ß, ©, ¹, ƒ
Use the up and down RANGE keys to select the letter or number, and use the left
and right arrow keys to choose the position. (Press down RANGE for letters; up
RANGE for numbers.) Enter the present password on the display. (Front panel
default: 002425.)
Once the correct password is displayed, press the ENTER key. If the password was
correctly entered, the following message will be displayed:
CALIBRATION UNLOCKED
Calibration can now be executed.
Press EXIT to return to normal display. Calibration will be unlocked and assume
the states summarized in Table 2-2. Attempts to change any of the settings listed
with calibration unlocked will result in an error +510, "Not permitted with cal
un-locked."
With calibration unlocked, the sense function and range track the source func-
tion and range. That is, when :SOUR:FUNC is set to VOLT, the :SENS:FUNC
setting will be 'VOLT:DC'. When :SOUR:FUNC is set to CURR, the
:SENS:FUNC setting will be 'CURR:DC'. A similar command coupling exists
for :SOUR:VOLT:RANG/:SENS:VOLT:RANG and
SOUR:CURR:RANG:SENS:CURR:RANG.
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Calibration 2-5