1-25. NIGHTSIDE TEST BENCH 2A3 (cont)
(4) Sensor Mount Assembly 2A3A1A3.
The sensor mount assembly uses a locking
handle to secure the nightside sensor assembly UUT. The forward position of the
handle (toward the nightside optical assembly) unlocks the UUT by retracting the four
In the rear position (away from the nightside optical assembly) the
four locking cams are extended to lock the sensor.
Two optical sensors are used to
sense the open and closed positions.
Signals INTERLOCK 1 (open) and INTERLOCK 2
(closed) are sent to the multiprogrammer assembly 2A2A6.
(5) Secondary Heat Source 2A3A1A17.
The secondary heat source (c) provides an IR
source for the wider field -of-view of the PNVS UUT.
Sources B and C are always
referenced to the precision source (A).
Only one source (B or C) can be selected at a
(a) The secondary heat source is enabled by IR SOURCE #3 signal from control
unit assembly 1A1.
A temperature sensor in the heat source transmits a signal (SENSOR
C) to the control unit assembly for temperature control.
(b) A microcircuit and heat sink assembly (sensor) transmits a SIG signal to
analog to digital converter assembly 2A2A13, and SIG, SI1, S12 signals to temperature
measurement CCA in the electronics drawer assembly 2A2A7.