87V EX
Calibration Manual
20
Calibration Adjustment Password
W
Caution
To avoid having to replace the Meter, do not change the
calibration password.
To start the Calibration Adjustment Procedure, the correct 4-button password must be
entered. The password is “1234”.
Meter Buttons Used in the Calibration Steps
The Meter buttons behave as described in Table 6 when performing the Calibration
Adjustment Procedure. This may be of help determining why a calibration step is not
accepted and for determining the input value without referring to Table 8.
Table 7. Meter Button to Calibration Function
Button Calibration
function
A
Press and hold to show the measured value. The measurement value is not
calibrated so it may not match the input value. This is normal.
B
Press and hold to display the required input amplitude.
G
Press and hold to display the frequency of the required input.
D
Press to store the calibration value and advance to the next step. This
button is also used to exit calibration mode after the calibration
adjustment sequence is complete.
Calibration Adjustment Procedure
Use the following steps to adjust the Meter's calibration. If the Meter is turned off before
completion of the adjustment procedure, the calibration constants are not changed.
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.
Press 4 buttons to enter the password (
A
= 1,
B
= 2,
C
= 3, and
D
= 4).
5.
Press
D
to go to the first calibration step. The Meter displays "C-01" if the
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.
Using Table 8, apply the input value listed for each calibration adjustment step. For
each step, position the rotary switch and apply the input to the terminals as indicated
in the table.
7.
After each input value is applied, press
D
to accept the value and proceed to the
next step (C-02 and so forth).
Notes
After pressing
D
,
wait until the step number advances before changing
the calibrator source or turning the Meter rotary knob.
