Calibration 19-5
Unlocking calibration
Before performing calibration, you must first unlock calibration as follows:
1. Press the MENU key, and then choose CAL, and press ENTER. The instrument will
display the following:
CALIBRATION
UNLOCK EXECUTE VIEW-DATES
SAVE LOCK CHANGE-PASSWORD
2. Select UNLOCK, and then press ENTER. The instrument will display the following:
PASSWORD:
Use , ▲, ▼, , ENTER or EXIT.
3. 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: 006430.)
4. Once the correct password is displayed, press the ENTER key. If the password was cor-
rectly entered, the following message will be displayed:
CALIBRATION UNLOCKED
Calibration can now be executed.
5. Press EXIT to return to normal display. Calibration will be unlocked and assume the
states summarized in Table 19-2. Attempts to change any of the settings listed below
with calibration unlocked will result in an error +510, “Not permitted with cal
unlocked.”
NOTE With calibration unlocked, the sense function and range track the source function
and range.
Table 19-2
Calibration unlocked states
Mode State Mode State
Concurrent Functions
Sense Function
Sense Volts NPLC
Sense Volts Range
Sense Current NPLC
Sense Current Range
Source V Mode
Volts Autorange
OFF
Source
10
Source V
10
Source I
FIXED
OFF
Source I Mode
Current Autorange
Autozero
Trigger Arm Count
Trigger Arm Source
Trigger Count
Trigger Source
FIXED
OFF
ON
1
Immediate
1
Immediate
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