Digital Multimeter
Calibration Adjustment
23
Calibration Adjustment
The Meter features closed-case calibration adjustment using known reference sources.
The Meter measures the applied reference source, calculates correction factors and stores
the correction factors in nonvolatile memory.
The following sections present the features and Meter pushbutton functions that can be
used during the Calibration Adjustment Procedure. Perform the Calibration Adjustment
Procedure should the Meter fail any performance test listed in Table 15.
Calibration Adjustment Counter
The Meter contains a calibration adjustment counter. The counter is incremented each
time a Calibration Adjustment Procedure is completed. The value in the counter can be
recorded and used to show that no adjustments have been made during a calibration
cycle.
Use the following steps to view the Meter's calibration counter.
1. While holding down B, turn the rotary knob from OFF to VAC. The Meter
should display “Z CAL”.
2. Press D once to see the calibration counter. For example "n001".
3. Turn the rotary knob to OFF.
Calibration Adjustment Password
To start the Calibration Adjustment Procedure, the correct 4-button password must be
entered. The password can be changed or reset to the default as described in following
paragraphs. The default password is “1234”.
Changing the Password
Use the following steps to change the Meter's password:
1. While holding down B, turn the rotary knob from OFF to VAC. The Meter
displays “Z CAL”.
2. Press D once to see the calibration counter.
3. Press D again to start the password entry. The Meter displays "????".
4. The Meter buttons represent the digit indicated below when entering or changing the
password:
A = 1 B = 2 C = 3 D = 4
H = 5 E = 6 F = 7 G = 8
Press the 4 buttons to enter the old password. If changing the password for the first
time, enter A (1) B (2) C (3) D (4).
5. Press C to change the password. The Meter displays "----" if the old password is
correct. If the password is not correct, the Meter emits a double beep, displays "????"
and the password must be entered again. Repeat step 4.
6. Press the 4 buttons of the new password.
7. Press D to store the new password.
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