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5. Check and Adjustment
5.1 The Instrument Constant
1) Check
It is suggested to observe and compare the instrument with a testing line
which is set on stable ground with a particular accuracy, though error is not
generally included in the instrument constant. If the testing line is
unavailable, you can set it for 20 meters or so by yourselves, then check and
compare it with your new instrument.
1. Select a point B on the approximately horizontal line AC with about 100
meters long. Measure the distances of lines AB , AC and BC .
2. The instrument constant can be calculated;
instrument constant =AB+BC-AC
3. If there is a difference between the instrument standard constant and the
calculated value , colligate the measured constant and the prism constant to
get a new value ,then input the value into the instrument as a prism
constant .
4. Compare length of the instrument’s testing line again with a certain
standard testing line .
5. If the difference is over 5 mm after the preceding operations, it is
necessary to reset the instrument constant .
2) Adjustment
About instrument constant setting, you must contact PENTAX distributor to
do that.
AB C
AB BC
AC
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