Filter Wheel/Motor Assembly 2A1A2A1O

TM-11-6625-3081-23-1 Electronic Equipment Test Facility TADS/PNVS Augmentation Equipment Manual
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TM 11-6625-3081-23 1-23. DAYSIDE TEST BENCH 2A1 (cont) 1-23 (b) The translator is driven by four signals (DSMA01, DSMA02,DSMAli13, DSMA04) from the motor control driver CCA (2A3A7A6A1). Two control signals (DSMAEN1, DSMAEN2) from the motor mux CCA (2A2A7A6A3) are used to select positioning of the translator. Two optical switches transmit signals (DSMA01,DSMA02) to the motor mux CCA (2A2A7A6A3), used to inform the computer of laser fold mirror assembly position. (7) Filter Wheel/Motor Assembly 2A1A2A1O. (a) The computer controlled filter wheel/motor assembly is located in the optical path between the beam sampler and the laser fold mirror assembly. It consists of two flat (360 degree) disk filters, mounted approximately 1/2 inch apart on a hub assembly. The disk filters are continuously variable, neutral density filters with maximum density in the optical path when in the “home” position. This is the most counterclockwise position usable on the wheel. (b) The filter wheel/motor assembly is driven by four signals (DSFA01, DSFA02,DSFA03,DSFA04) from the motor control driver CCA (2A2A7A6A1). Two control signals (DSFAEN1,DSFAEN2) from the motor mux CCA (2A2A7A6A3) are used to select positioning of the filter wheel. Two optical switches transmit signals (DSFAD1, FILTER INTERLOCK) to the motor mux CCA (2A2A7A6A3) and multiprogrammer assembly (2A2A6), respectively. These signals are used to inform the computer of filter wheel/motor assembly position. (8) Automatic Focus Control Assembly 2A1A2A12. (a) The automatic focus control assembly is located in the optical path between the filter wheel/motor assembly and the UUT. The computer positions the assembly to compensate for slight changes in focal path length due to temperature changes within the inner module. Focus adjustments are based on the type of tests to be performed, and on the spectral range in use. The nominal is for the direct view optics spectrum, and then adjustments are made for the TV spectrum and the laser spectrum, and in every case for temperature shifts. (b) The automatic focus control assembly is driven by four signals (DSFC01,DSFC02,DSFC03,DSFC04) from the motor control driver CCA (2A2A7A6A1). Two control signals (DSFCEN1,DSFCEN2) from the motor mux CCA (2A2A7A6A3) are used to select positioning of the automatic focus control assembly. (9) Beam Sampler 2A1A2A13. The beam sampler is located in front of the radiometer narrow beam attenuator, a part of the radiometer assembly. The beam sampler is an optical transferring device consisting of a base and housing, two optical beam splitter lenses, and a protective cover. The purpose of the beam samp- ler is to split the laser beam path into two separate paths. One path is through the laser aperture inside the laser cover assembly and the other path is down through the filter wheel/motor assembly. (10) Laser Cover Assembly 2A1A2A19. The laser cover assembly 2AlA2A19 (FO-17) forms part of the laser interlock circuit (FO-35) to prevent firing of the laser transceiver unit (UUT) without an enclosed shielded environment. Two door interlock switches and a key switch are part of the laser interlock circuit which must be enabled before the laser can be fired. Change 1 1-147

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