SLT12 User Manual
199
points.
7. Install the cover back to its original position.
17.8 Instrumentation Plus Constant (K)
The instrument constants are checked at the factory and corrected in the machine so that K =
0. The instrument constants rarely change, but we recommend that this test be performed once
or twice a year. This test is suitable for the standard baseline, but can also be carried out
according to the following simple method.
17.8.1 Check
1. Select a flat site at point A to place and level the apparatus, and use vertical wire to
carefully mark the same line on the ground at an interval of about 50m between points A, B,
and B, C, and accurately align the reflective prism.
2. After the instrument was set up with temperature and air pressure data, the flat distance of
AB and AC was measured accurately.
3. Place the instrument at point B and align it accurately to measure the flat distance of BC
precisely.
4. The instrument range constants can be derived as follows.
K = AC - (AB + BC)
K should be close to equal to 0, if
｜
K
｜＞
5mm should be sent to the standard baseline field
for strict inspection, and then corrected according to the inspection value.
17.8.2 Adjust
After strict inspection to confirm that the instrument constant K is not close to 0 has changed,
the user, if required to make corrections, will set the instrument plus the constant according to
the value of the integrated constant K. For example, if the K value measured by the above
method is -5, and the original instrument constant in the instrument is -20, the newly set value
is -20 - (-5) = -15.
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