The junction box (Figure 2-26) distributes +4.8 and +16.8 VDC power
ON/OFF/STBY switch S1 controls the power.
ON/OFF/STBY switch S1 is set to on, the junction box supplies +4.8
VDC to the night sight via connector J3 and to the boresight
collimator via connector J4, and supplies a switched +16.8 VDC to the
cooler via connector J2.
The cooler control circuit senses the
detector temperature via J5 and cycles the cooler power on and off
about a referenced voltage to maintain an optimum detector operating
temperature. Setting the ON/OFF/STBY switch S1 to STBY activates the
cooler control circuit and disables the +4.8 VDC to the night sight
and the boresight collimator.
The standby circuit operates the
cooler sufficiently to obtain usable video within 30 seconds after
setting the ON/OFF/STBY switch S1 to ON, without excessive battery
drain during the time when the night sight is not needed.