- determine the angular value of the object by the scale of angles of elevation and by the scale of
traversing angles;
- determine range D by the angular value of the object from the table. For drawing up such tables one
uses formula:
R = x 1,000 ,
where: R - the range in metres;
S - the known size of the object in metres;
A - the angular value of the object in mils;
1,000 - the factor which converts the angular value in mils
into the abstract value
7 MAINTENANCE
The faultless operation and longevity of the device service life depends to a considerable extent on its
regular checking and maintenance.
During use of the device it is necessary to check its technical condition in due time with the aim of
detection and elimination of its derangements. The technical condition of the device is characterized by its
good order, completeness and readiness for use.
The list of operations in checking the device technical condition is given in tab. 3.
Table 3
What is checked, what tools,
instruments and equipment are used.
Method of checking
Technical requirements
1
The
device
completeness
in
compliance with the list of complete set.
Check it by visual inspection
The complete set must be
fully available
2 The outer appearance of the device
and its parts, reliability of securing of
units, mechanisms and parts. Check it
by visual inspection, testing by hand
and using tools from the single STA kit
No cracks, dents, traces of
corrosion and other defects
must be on the outer surfaces
of the device.
All units, mechanisms and
parts must be reliably secured
3 Integrity of the lenses of the eyepieces
and objectives, light filters and the
condition of the level vial. Cleanness of
the outer surfaces of the optical pieces.
Check it by visual inspection
The optical pieces must be
intact and clean
4 The condition of the headrest and
reliability of its fastening. Checking is
performed by visual inspection and
testing by hand
The headrest must be in good
order.
The
displacement
of
the
headrest after clamping is not
allowed
5 The condition of silica gel in
desiccators.
Check
it
by
visual
inspection
Silica gel must be bluish
6 Smoothness of extension of the tripod
legs. Check it by testing by hand
The tripod legs must be
extended over the whole
lenght smoothly, without
seizing
7 The operation of the mechanism of The
operation
of
the
