TM 9-4931-355-14
Table 1-3. General Support Special Tools and Test Equipment-Alinement Kit (11738863)
Reference
Item
NSN or
Fig.
Item
Function
No.
Item
reference No.
No.
No.
1
Cable, assembly
4931-00-628-1750
2
To provide power to receiver-
(11741597)
transmitter unit (A76) when the
ballistic cover is removed.
2
Case, carrying
11737981
1-4
4
To carry and store all items of the
alinement kit special tools and test
equipment.
3
Goggles, laser safety (industrial)
4244-00-258-2054
1-4
3
To provide eye protection during
(10554508)
receiver-transmitter unit (A76)
alinement.
4
lens assembly alinement
4931-00-628-1987
1-4
1
To permit alinement of eyepiece
(11741599)
reticle with transmitter laser beam.
5
Tool, boresight-adjustment
4931-00-628-1334
1-4
5
To adjust screws which aline
(11741598)
transfer prism.
6
Insert, lower
11745641
1-4
6
To retain items within the case.
7
Insert, upper
11745640-1
1-4
7.
transmitter output energy. Refer to figure 1-6 for block
b. The receiver-transmitter tester (referred to as
diagram of the R/T tester. The receiver test lamp driver
R/T tester) mounts on the face of the receiver-
contains a regulator circuit that enables a test lamp to
transmitter to measure and provide an indication of
produce a constant calibrated light intensity to measure
transmitter output energy and receiver sensitivity of the
go-no-go receiver sensitivity.
laser range finder. The laser energy detector consists of
optical devices and electronic circuitry that measures
c. Operating voltages are supplied by the hot
mock-up.
(Located in back of manual)
the sample and hold circuit which samples the output of
1-5. Functional Description.
the light-sensitive photodiode.
a. To measure transmitter output energy, MODE
SELECT switch on the R/T tester is set to the position
c. The laser light is diffused by a set of diffusers
that lights XMTR lamp. The signal that lights the XMTR
and attenuated by filters before reaching the
lamp is also applied to RESET-FIRE switch on the R/T
photodiode. A portion of the filtered light is then applied
tester. The RESET-FIRE switch on the R/T tester is set
to the photodiode which generates a signal current
to RESET, which generates a manual reset signal. The
proportional to the intensity of laser light. This signal
manual reset signal is used to reset the laser range
current is integrated by a capacitor in the integrator for
finder, and also to trigger a one-shot multivibrator. The
the entire duration of the laser pulse to provide a
output of the one-shot multivibrator enables the sample
voltage which is proportional to the energy of the laser
and hold circuit which senses the output of the light-
pulse. The sample and hold circuit uses this voltage
sensitive photodiode. The sensitivity of the photodiode
and produces a deflection on the RCVR-XMTR STATUS
is such that it will have no output when no laser pulse is
meter, which provides an indication of transmitter output
present and the output of the sample and hold circuit is
energy.
reset to zero.
d. To measure receiver sensitivity, MODE
b. The RESET-FIRE switch is then set to FIRE,
SELECT switch is set to the position that lights RCVR
which causes the input signal from the MODE SELECT
lamp. When the R/T tester is operated in the receiver
switch to generate a remote range signal. The remote
test mode, the switching regulator power supply is
range signal, which is applied to the power supply
turned on to provide constant power to the receiver test
control unit, fires the transmitter and causes it to
lamp. The constant intensity light from the receiver test
generate an A-trigger signal and a burst of laser light.
lamp is collimated by the collimating lens and directed
The A-trigger signal triggers the one-shot multivibrator.
into the receiver optics of the receiver-transmitter
The output of the one-shot multivibrator again enables
1-9
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