TM 5-6675-250-10
2-7. OPERATING PROCEDURE - Continued
OPERATION - Continued
NOTE
Actuation of the RESET switch reinstates the servo mechanism so that it
may continue to track and damp the pendulum for a minimum of 45 sec-
ends. Under normal operating conditions, it is not required to use the reset,
for it would only delay the azimuth determination with little improvement in
azimuth determination accuracy. Three possible examples of when to use
the reset are: (1) an abnormally short alignment time, (2) when the GRU or
tripod has been disturbed after the READ AZIMUTH indicator illuminates,
or (3) after an immediate full-scale deflection either direction on the TEST
METER FOLLOWING ILLUMINATION OF the READ AZIMUTH indicator.
Considering time available to establish azimuth and azimuth and accuracy
required, the operator must exercise judgment prior to performing the reset
operation. In order to avoid error accumulation, it is recommended that the
RESET not be used later than 20 minutes after biasing.
THEODOLITE READING
a.
Adjust the RETICLE FOCUS (1) to obtain a
sharp, clear image of the reticle pattern.
Release the horizontal (2) and vertical
b.
locks (3) on the theodolite. Align the reticle
on the target. Focus the telescope (4) to
obtain a clear, sharp image of the target.
c.
Adjust the azimuth (5) and elevation con-
trols (6) to center the target in the reticle
pattern.
d.
Adjust the MICROSCOPE FOCUS (7) to
obtain a clear, sharp image of the scales.
Adjust the THEO BRT control on the ECU
to illuminate scales.
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