1-23. DAYSIDE TEST BENCH 2A1
Refer to FO-12 for a block diagram of the dayside test bench. The dayside test
bench is described in the following order:
Optical signal analyzer 2A1A1
Inner module 2A1A2
Indirect view display 2A1A3
Laser power supply assembly 2A1A6
Laser power meter 2A1A7
Radiometer head 2A1A8
b. OPTICAL SIGNAL ANALYZER 2A1A1 (EO BENCH SERIAL NUMBERS 00001 THRU 00105)
The optical signal analyzer (OSA) 2A1A1 (FO-13) is an electro-
optical test device used to test the HOD, IVD, high voltage power supply and pulse
forming network UUTs. The UUT is loaded
tight door when the test is in progress.
Photon emitter assembly 2A1A1A3
Bracket assembly 2A1A1A4
Main access door interlock switch
Power supply assembly 2A1A1A6
into the-analyzer and enclosed by a light-
The OSA consists of the following
Photomultiplier bracket assembly 2A1A1A7
Interface assembly 2A1A1A8
Tray assembly 2A1A1A9
PMT access door interlock 2A1A1A11
Relay assembly 2A1A1A12
Filter and detector assembly 2A1A1A14
(2) Photon Emitter Assembly 2A1A1A3.
(a) The photon emitter assembly 2A1A1A3 consists of a CCA and a cover
The CCA contains a resistor and green diffused LED. The LED is the test
light source situated behind a mask of hole patterns that provides a monitoring source
for the photomultiplier tube.
(b) A digital output signal OA TEST SOURCE from the multiprogrammer assembly
2A2A6 controls the operation of the photon emitter assembly.
(3) Bracket Assembly 2A1A1A4.
The focus lens is mounted directly in front of the
CRT of the UUT and is part of the UUT mounting bracket (bracket assembly 2A1A1A4).
(a) Signals OSAF 01, OSAF 02, OSAF 03, and OSAF (04 from the motor control
driver CCA in the electronics drawer assembly 2A2A7 drive 4-phase stepper motor M1,
which positions the focus lens.
Full travel of the focus lens lead screw requires
(b) Signals OSAF EN1 and OSAF EN2 from stepper motor M2 encoder and signals
OSAF D1 and OSAF D2 from optical switch assembly Al transmit the focus lens position
to the motor mux CCA in the electronics drawer assembly 2A2A7.