Adjusting the Clock's Precision
Option 10 in the option mode allows you to adjust the clock's precision. If you decrease
the value by one, the clock runs approx. 1.3 s slower per month. If you increase the
value by one, the clock runs approx. 1.3 s faster per month.
In order to adjust the clock's precision you have to determine how much time the clock
deviates over a period of time. Use a reference clock to this purpose. Examples of a
reference clock include a GPS clock and the clock on the Teletext pages.
Measure the period in hours and the deviation in seconds. The deviation is positive when
the clock runs too fast, it is negative when the clock runs too slow. When you determine
the deviation, you must only take whole seconds into account disregarding any fractional
part.
Once you've determined the values for the period and the deviation, use the following
formula to calculate the adjustment:
adjustment = − (deviation × 550 ÷ period)
Example
Suppose the clock runs 2 seconds behind over a period of 72 hours. Hence the deviation
is -2 s. According to the formula, the adjustment is −(−2 × 550 ÷ 72) = ~15. In order
to adjust the clock's precision, you'll have to add 15 to the value of option 10 in the
option mode.
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