1-23. DAYSIDE TEST BENCH 2A1 (cont)
(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
Two optical switches transmit signals (DSMA01,DSMA02) to the motor mux
CCA (2A2A7A6A3), used to inform the computer of laser fold mirror assembly
(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
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.