Radiometer Assembly Characteristics (cont)

TM 11-6625-3081-23 1-12. DESCRIPTION OF DAYSIDE TEST BENCH 2A1 (cont) 1-12 (c) The purpose of the filter wheel/motor assembly is to provide an ND variation that attenuates the laser energy being directed to the matrix array camera. The level of filtering is reduced incrementally (1 micrometer increment per step) by the gearhead stepper motor assembly. (7) The lampholder assembly contains a lamp which is used for alinement of the dayside test bench inner module during calibration. (8) The automatic focus control assembly 2A1A2A12 is located under the filter wheel/motor assembly 2A1A2A1O. It contains a lens housing assembly and mates with a gearhead stepping motor and incremental encoder (linear translator). The purpose of the 2A1A2A12 is to position the lens assembly to compensate for slight changes in focal path length due to temperature changes. Direct commands can also be used based on type of unit under test and the spectral range required. (9) The beam sampler assembly 2A1A2A13 is located in front of the radiometer narrow beam attenuator (part of the radiometer assembly). It is an optical transfer- ring device made up primarily of a base and housing, two optical beam splitter lenses, and a protective cap. The purpose of the beam sampler is to split the laser beam path into two separate paths. (10) The cable entry panel 2A1A2A17 is located on the left side of the inner module. It is accessible by removing the upper left panel on the dayside cabinet. It contains four electrical connectors J1 thru J4, and a center panel mounted coaxial connector J5. (11) The laser cover assembly 2A1A2A19 is a rectangular box that is hinged to the left front section of the dayside test bench. The outside of the cover contains two indicators, a key and switch lock assembly, electrical cable with a pistol grip switch attached, and three multipin connectors, J1, P1, and P2. Two interlock switches . are located behind the cover. The key and switch lock assembly provides positive control for opening and closing the laser protective cover. The purpose of the laser cover assembly is to prevent firing the laser transceiver unit UUT without ensuring an enclosed, shielded environment protection for using personnel. 1-47