setting the eyepieces by the observer’s
interpupillary distance. Checking is
performed by rotation of handwheel 14
(Figure 1)
mechanism of setting the
eyepieces by the interpupillary
distance must be smooth,
without seizing and ensure
the setting of the interpupillary
distance in the range from 59
to 72 mm
8 The run of the eyepieces and
possibility of their setting in the rangeof
the diopter scales. Checking is carried
out by rotation of scales 10 (Figure 3)
The run of the eyepieces must
be smooth, without clearance
and seizing and setting to any
value of the diopter scale
must be ensured
Continuation of the tab. 3
What is checked, what tools,
instruments and equipment are used.
Method of checking
Technical requirements
9 The operation of the mechanisms of
angles of elevation and traversing
angles. Check it by rotation of the
device around the horizontal and
vertical axes with the use of handles 6
(Figure 1)
The rotation must be smooth,
without jerks and seizing
10 The breaking devices. Checking is
carried out by testing by hand
The braking devices must
ensure reliable fixation
8 POSSIBLE DERANGEMENTS AND METHODS
OF THEIR ELIMINATION
Table 4
Derangement, outer
display and additional
symptoms
Probable cause
Method of elimination
1 The terrain image is
visible weakly through the
device
Dust and dirt on the
outer surfaces of
the optical pieces
Wipe
the
outer
surfaces of the optical
pieces by using a
tissue
Sweating
of
the
optical pieces
Blow the device with
dry
air.
Check
its
tightness. Replace the
desiccators with new
ones
2
Silica
gel
in
the
desiccators becomes pink
Silica
gel
is
saturated
with
moisture
Replace
the
desiccators with a new
ones
