Hi-Target HTS-420R - Instrument Adjustments and Setup; Reflecting Prism Usage; Base Loading and Unloading; Telescope Objective and Aiming Adjustment

HTS-420R Maintenance Manual
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5. Index Error Calibration (2I Calibration)
1) Fix the instrument on a solid and stable platform then level it. In the meantime, make sure the sight line
from the eyepiece to the target crosshair is approximately horizontal.
2) Turn the instrument to Face 1, aim at the target crosshair and make both crosshair coincide. Note the HR
(Face 1) and turn the instrument to Face 2. Do the same thing as done on Face1 and note HR (Face 2).
Calculate the 2I= 360°- HR (Face 2)-HR(Face 1). If the 2I is outside of the qualified range of -16 to 16, take
the steps below to calibrate the 2I.
3) Face 1: press the button to enter the bubble chart interface to turn off the compensator, as shown
in the first picture. Choose “Tools”->”Adjust”->”Adjust Index Error”, as shown in the second picture below.
Aim at the target crosshair and make both crosshairs coincide then press 【ok】, the screen will display the
message “ Take reverse”, then turn the instrument to Face 2.