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Table 9.1, continued
Items to check, test procedure Technical requirement
Sensitivity, indexing uniformity and
balance of the magnetic needle.
Proceed as directed under 7.6.2.
Send the unit for repair if even a
single requirement of 8.6.2. is not
satisfied.
AI azimuth and elevation adjustment
knobs must not be loose.
If necessary, tighten bushings on
knob end facets.
10. MAINTENANCE
10.1. Maintenance Organization and Procedure. General
Instructions.
10.1.1. This Section deals with the maintenance services
prescribed for the range finder, excepting the battery servicing
procedure. For the instructions on the battery service procedure,
refer to Section 15.
10.1.2. The range finder is serviced to ensure its operability and
readiness for operation.
The rangefinder is subject to timely full-scope servicing, unless
premature wear should occur resulting in shorter periods
between repairs.
10.1.3. While preparing for and carrying out the maintenance
services, observe the safety precautions as outlined in Section 6.
7.4. To use the AI and tripod for observation, proceed as follows:
- Arrange the tripod on selected site so that one leg aligns with
the ranging direction;
- Extend the telescopic legs at the desired length to achieve
maximum convenience for the observation.
In case you do not use the tripod proceed as follows:
- Unscrew the ball-mount seat from the tripod base;
- Fit the stay block on to the wooden object and tighten it.
- Install and level the AI using the ball-mount by turning AI in
ball-mount seat and putting the level bubble into the centre
of the ring marks.
- Secure the AI by clamp.
- Sliding the rangefinder along the AI bracket guides, fit the
AI clamp into the T-shaped opening in the rangefinder
bracket, and turn the handle of the clamp to lock the
rangefinder in this position.
7.5. Use the AI compass or the reference directional angle to
align the rangefinder with the base line.
7.5.1. To align the range finder with the base line, proceed as
follows:
- Aim the rangefinder to the reference point;
- Find the base reference (BR) from the formula:
BR = α
base
– α
ref
± 30.00’
where α
base
is the base line directional angle;
α
ref
is the directional angle of the given reference line.