TM 11-6625-3081-23
1-14.
DESCRIPTION OF NIGHTSIDE TEST BENCH 2A3 (cont)
1-14
(3) The shutter assembly 2A3A1A2 is mounted on the front side of the nightside
optical assembly adjacent to the sensor mount assembly 2A3A1A3. The shutter assembly
consists of a shutter assembly housing, eight shutter vanes, cable assembly W7 (cable
with optical switch assembly attached), cable assembly W8 (cable with shutter solenoid
attached) and electrical connector plate assembly.
A dust cover is placed over the
shutter assembly whenever a UUT is not installed.
The purpose of the shutter assembly
is to remain open during UUT operation and closed for protection of the nightside test
bench mirror assemblies when a UUT is not operating.
(4) The sensor mount assembly 2A3A1A3 is a heavy, cast aluminum mount that
supports and positions the night sensor assembly UUT for testing.
It is mounted to
the front side of the nightside test bench and primarily consists of a mounting base
plate, handle assembly, sensor mount bracket assembly, and W1O cable assembly. The
handle assembly locks the UUT to the sensor mount assembly. The W1O cable assembly
contains two optical switch assemblies Al and A2 that sense the lock and unlock condi-
tion of the handle assembly.
(5) The connector bracket assemblies (2A3A1A15 and 2A3A1A16) are two separate
cable entry panels.
These panels interface the cabling coming from cable entry panel
2A3A4 and the internal cabling of the nightside optical assembly.
(6) The secondary heat source assembly 2A3A1A17 is positioned inside the night-
side optical assembly below the upper mirror assembly.
It primarily consists of a
1.5 inch heat source (heat source “C”), fold mirror housing assembly, air outlet duct
assembly, and microcircuit and heat sink assembly.
The latter assembly threads into
the plate of the heat source “C”.
The microcircuit and heat sink assembly consist of
a cable assembly wired to a temperature sensor mounted inside a heat sink.
Heat
source “C” contains a 1.5 inch square radiating surface controlled to an accuracy of
1.O°C incremental steps.
A fan is contained inside the heat source “C”.
(7) Cable assemblies 2A3A1W5 and W6 contain all the connectors for interfacing
the assemblies contained in the nightside optical assembly. W5 contains connectors
P4, P5, and J1 thru J5.
W6 contains one wired in temperature sensor, connectors J1
thru J4, and P1 thru P15.
1-91
