1-26. TEST PROGRAM SETS (TPS) (cont)
c. TPS HARDWARE
TPS hardware are those peculiar items necessary to interface the UUT to the
AN/USM-410 and EETF TADS/PNVS augmentation equipment. The test program includes the
necessary connections of these interface devices although not all TPSS contain every
The interface device hardware includes the following:
Major test adapter
Minor adapter assembly
Personality circuit card assemblies
(1) Major Test Adapter.
The major test adapter is the universal adapter. It
provides the means of interfacing the test equipment to the UUT, minor adapter, and
It also houses the five types of personality circuit card assemblies needed
for additional interfacing or signal conditioning between the UUT, interface
devices, and test equipment.
The major test adapter is passive and contains only
two safety interlock switches and a signature resistor in addition to its wiring.
(2) Minor Adapter Assembly.
The minor adapter assembly interfaces a particular
UUT to the major test adapter.
It provides signal routing of the stimuli and meas-
urement data to/from the UUT and on to the major test adapter. The minor adapter
assembly contains up to two connectors which connect to the major test adapter and
the for a UUT.
A minor adapter assembly is used when the UUT is a circuit card
assembly and only during a depot TPS.
TPS cable assemblies interface the test equipment
input/output connectors to the UUT and interface device hardware.
They are typ-
ically a branched cable to access the multiple connectors of the UUT and/or test
equipment, and will in some cases have branches to the major test adapter, minor
adapter assembly, and test fixtures.
Some cables are used for more than one TPS and
others are used during the EETF TADS/PNVS augmentation equipment self-test.
(4) Self-Test Connectors.
Self-test connectors are used during the IDSELFTEST
portion of the test program.
They are connected to the interface device hardware as
displayed on the VDT.
After these connections are performed, IDSELFTEST is run
which performs a continuity check on all the interface device hardware used during
that particular TPS.
If continuity is not satisfied the broken path where con-
tinuity did not exist is displayed on the VDT and IDSELFTEST is aborted.
(5) Test Fixtures.
Some TPSs require additional interface device hardware
called test fixtures.
They provide handling/mounting capabilities beyond that of
the other interface devices.
The test fixtures are simple devices, but precise,
such that critical alignments are attained by bolting the fixture onto the test
equipment and then mounting the UUT to the fixture, which is keyed for alignment.
Some test fixtures may simply be holding devices which include actuators or just an
additional signal routing path while others are used in direct relation with a
particular measurement during a test.