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accurately to measure the horizontal distance of BC precisely;
4. Obtain the distance measurement constant of the
instrument: K= AC-(AB+BC);
K should be close to zero, if | K | > 5 mm,it should be send
to standard baseline field for strict checking.You can calibrate it
based on the checking value.
Calibration
If it turns out the instrument constant does not close to 0 but
changing after strict inspection, you need to calibrate it, and set
the instrument additive constant according to the comprehensive
constant K value. Such as: the K has been measured as ‘-5’
according to the method above, and the original instrument
constant is ‘-20’, so the new value should be set as ‘-20-(5)
=-15’; Input ‘-15’ through "menu-> 6->2" and then confirm.
Use the vertical line of the reticle to orientate, make A, B
and C at the same line accurately. There must be a clear mark for
point B on the ground to focus.
Whether the prism center of the point B coincide with the
instrument center is the guarantee of checking the accuracy, so,
you have better use tripod and all-purpose tribrach, for example,
if you change the three-jaw type prism connector with tribrach,
keep the tripod and tribrach stable, just change the prism and the
part above the tribrach of instrument, and it can reduce the error
of misalignment
11.9 The parallelism of collimation axis and
photoelectricity axis
Checkout
1. Place a reflector prism 50 meters away from the
instrument;
2. Focus on the reflecting prism center with telescope
