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|  MIL-T-81778C(AS)
3,6.2.3 Switching Unit, Fault Isolation SA-1895( )/AWM-23(V). The fault
isolation switching unit shall provide the radio frequency and low frequency
matrices required to switch the test signals to the monitoring instruments
during fault Isolation. WRA fault isolation selector assembly shall also
be included in this panel. The test controller and test circuits drawer
shall provide the switching, logic, and RF circuits necessary for testing
the test controller section of the Control, Antenna-Test C-9038( )/AWG-9
WRA. The 32 bit SSI words from the WRA storage registers shall be switched
to WRA line receiver inputs and to drawer logic in-order to test the storage
register and analog WRA circuits. Logic circuits shall be included in the
drawer to provide GO/NO-GO signals to read out indicators on the electrical
test panel (3.6.2.2). An RF amplifier shall be provided in the drawer to
amplify low level signals from the RF section of the WRA for frequency
counting. RF switching circuits shall also be included for switching signals
to monitoring Instruments. The panel shall also provide the capability to
null the antenna servo components.
3,6.2.4 Switching Unit, Fault Isolation SA-1896( )/AWM-23(V) and SA-2086( )/
AWM-23(V)*. The fault isolation switching unit shall provide the stimulus
circuits and the load circuits for the antenna servo and IR WRAs. This drawer -
shall also provide the switching matrices for WRA signal switching to the WRA
and from the WRA for functional test and fault isolation.
3.6.3 Console, Test, Low Frequency, Power Supply OJ-255( )/AWM-23(V). The
equipment of this console shall be as specified in the following.
3.6.3.1 Spectrum analyzer. A spectrum analyzer, Hewlett-Packard 141T with
8553B and 8552A plug-ins, or equivalent, shall be supplied. The spectrum
analyzer shall provide the capability to measure the RF spectrum of the test
controller portion of the Control, Antenna-Test C-9038( )/AWG-9.
3.6.3.2 Switching Unit, Fault Isolation SA-1897( )/AWM-23(V). The fault
isolation switching unit shall provide the stimuli circuits required for
testing Power Supply WRAs PP-6773( )/AWG-9, PP-6774( )/AWG-9, PP-7010( )/AWG-9
and PP-7042( )/AWG-9. This panel shall also provide the switching matrices
for switching the power supply outputs to the monitoring instruments for
functional test and fault isolation of the power supply WRAs.
3.6.3.3 panel, Coolant Supply MS-9308( )/AWM-23(V).
The coolant supply
panel shall provide cooling air connections for Power Supply WRAs PP-6773( )/
AWG-9, PP-6774( )/AWG-9, PP-7010( )/AWG-9 and PP-7042( )/AWG-9.
3.6.3.4 Mounting MT-4503( )/AWM-23(V). The mounting shall provide mounting
for Power Supply WRAs PP-6773( )/AWG-9, PP-6774( )/AWG-9, PP-7010( )/AWG-9
and PP-7042( )/AWG-9. The mounting surface shall also provide electrical
connections for WRAs under test.
* SA-1896 is part of OJ-215( )/AWM-23(V) only.
SA-2086 is part of OJ-379( )/AWM-23(V) only.
IR WRAs are tested on OJ-215( )/AWM-23(V) only.
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