Fluke 381 - Change the Password; Two Special Passwords; Adjustment Procedure

381
Calibration Manual
16
Change the Password
To change the password:
1. The display shows “----“.
2. Enter the 4-digit password. For this step, the keys are mapped to the corresponding
digits:
- 1
- 2
- 3
- 4
- 5
After all 4 digits are entered, the leading “-“ icon appears on the display.
3. Push  to store the new password.
4. After the new password is entered, the Product reboots and the display briefly shows
“F381” and then changes to the current selected function.
At any step during this procedure, turning rotary switch to OFF terminates the Calibration
Password mode.
Two Special Passwords
The Default Password is 1234. It is used when the Product shows “CAL ERR”, which
means that the calibration parameter is corrupted. Entering the default password takes
you to the calibration mode. After the Product is calibrated, “CAL ERR” disappears.
The Master Password is 4132. If the password is forgotten, you can enter the Master
Password after “????” shows on the display. Then push  and the password is restored
to the Default Password: 1234. The Master Password is protected, and you cannot
change the Calibration Password to this combination.
Adjustment Procedure
The Product features a closed-case calibration procedure. To adjust Product calibration:
1. Turn the Product ON.
2. Push  while turning the Rotary Switch to
.
3. Push
.
4. Enter the Calibration Password.
5. Push
 again to enter calibration mode.