Radiometer Assembly Characteristics (cont)

TM 11-6625-3081-23 1-12. DESCRIPTION OF DAYSIDE TEST BENCH 2A1 (cont) 1-12 (c) Four cable assemblies contain optical switches that sense the movement of various items in the mount. An actuator switch SW1 is also installed on the mount. (d) A specially-fitted, dayside mounting adapter fits to the mount for UUT installation. This mounting adapter, once fitted to a dayside test bench, becomes a permanent part of that unit and is not interchangeable with another dayside test bench. (5) The laser fold mirror assembly 2A1A2A6 consists of a translator assembly 2A1A2A6A8 and the laser mirror assembly. It is located next to the shutter assembly and its optical path. The translator assembly is an incremental encoder (one micro- meter increment per step) driven by a gear reduction, direct current motor. The translator assembly does the following: (a) Position the mirror assembly for directing laser energy from the laser transmitter to the matrix array camera. (b) Position the mirror assembly away from laser energy path (a) to permit the collimator port to be used for laser spot tracker and optical device testing. (6) The filter wheel/motor assembly 2A1A2A1O is located below the beam sampler 2A1A2A13. It consists of a filter wheel assembly and a cable assembly that includes the motor. (a) The filter wheel assembly consists of two, flat (360 degree) disk filters mounted approximately l/2-inch apart on a hub assembly. Part of the filter wheel extends into a cutaway on the front plate of the inner module as it revolves on its hub axis. The neutral density (ND) filter coating is on the inside surface of each disk and varies in density (clockwise) from 2.430 to 0.024 ND. (b) The cable assembly consists of a connector, wiring, and gearhead stepper direct current motor assembly. 1-45