ADC-A12C31 Operator’s Handbook Rev. A P. 22
Hand Calibration
The ADC-A12C31 analog clock hands have been pre-set and aligned at the factory. This hand location
and alignment information is retained in non-volatile flash.
The visual determination of the accuracy of the hand display should be done by comparing
the clock hands only after the ADC-A12C31 indicates that it is synchronized to time code and
then only to a digital display or other reference that has also been locked, preferably to the
same time code reference. The reference display should be set adjacent to the ADC-A12C31
unit and eye movements should be minimized when doing comparisons.
To adjust the hands
1. Select “Set” using switch S2.8 (ON).
2. Select either the 12:00:00 (OFF) or 6:00:00 (ON) position using switch S2.7.
3. Depress and release either button [B1] or [B2] to move the hands in the desired direction
for either 12:00:00 o’clock or 6:00:00 o’clock.
After releasing the button, the hands will rotate in the desired direction until any button
is pressed. This feature allows for easier setting of the hands.
4. Depress and Hold [B1] or [B3] down for 10 seconds to advance rapidly, then release.
5. The hands will rotate rapidly until any button is pressed.
6. Stop the hands a few seconds before the desired position.
7. Fine-tune the second hand position to the center of the 12-indicator mark by pressing
[B3] to move the second hand in the forward direction incrementally.
8. Verify the final hand positions.
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