HTS-420R Maintenance Manual
11
4. Collimation Error Calibration (2C Calibration)
1) Fix the instrument on a solid and stable platform. After leveling it, continue the following steps.
2) Face 1: Aim at target crosshair and make both crosshairs coincide. Set horizontal angle to 00°00′00″ (for
easier calculation) and turn instrument to the Face 2.
3) Face 2: Do the same thing as done on the Face 1 except setting 0. Note the horizontal angle HR and
calculate the 2C: 2C = HR (Face 2) – HR (Face 1) - 180°= HR (Face 2)-00°00’ 00”-180°=HR (Face 2)-180° then
check if the 2C is within the qualified range of -16 to 16. If it is not, take the following steps to calibrate the
2C.
4) If 2C<-16, loosen the screw of the right side then tighten the screw on the left side to draw the vertical
line of the telescope crosshair toward the left side , in the meantime, observe the movement of the vertical
line of the telescope crosshair until the vertical line is in the correct position. E.g. if 2C=179°59’ 10”-180°=
-50”, loosen the screw of the right side then tighten the screw of left side to draw the vertical line toward
the left side by |-50|”/2=25’’(namely 1.25 grid by 1grid=20’’), as shown in the picture below.
5) If 2C>16, loosen the screw of the left side and tighten the one on the right side. E.g. If 2C=180°00’
20’’-180°=20”, loosen the screw of the left side then tighten the other one to draw the vertical line toward
the right side by 20”/2=10”.(the alignment the is based on face 2)
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