Confirmation Of Distance Constant - Sokkia SDM3E Operation Manual

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XL CONFIRMATION OF DISTANCE CONSTANT
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The SDM3E is quality-controlled to have a nil distance constant.
The distance constant rarely changes. However, when some con-
stant error seems to exist in measurements or as a periodical
check (several times a year), check the distance constant as follows.
1
I, Confirmation of the distance constant K.
Select points A and B on a flat ground about 330 ft (100 m)
in between, and C in the middle.
2. Set up the SDM3E at A, and measure the distance AB.
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A B
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3. Shift the SDM3E to C, and measure the distances CA and CB.
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4. Compute the distance error K with the formula:
K = AB- (CA + CB)
5.
Obtain K more than two or three times. If the K is far from
nil, contact our agent.
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