TM 11-6625-2440-12
Control, indicator, or connector
Ref des
Function
Connector J11-----------------------------------
2A1J11
Provides control signal connection between electronics unit and C-D
unit.
Connector J12-----------------------------------
2A1J12
Provides power connection between electronics unit and C-D unit.
LATITUDE switch (internal) ------------------
2A1S11
NORTH: Provides polarity of platform stable element heading axis earth
rate correction for proper operation in the northern hemisphere.
SOUTH: Provides polarity of platform stable element heading axis earth
rate correction for proper operation in the southern hemisphere.
Note. This switch is set during installation and need not be moved
unless the test set is moved across the equator. (See chapter 2.)
BREATHER VALVE ---------------------------------------------------
Provides two-way pressure equalization.
Section II. OPERATION UNDER USUAL CONDITIONS
3-3. General
NOTE
Disregard
setting
of
LATITUDE
CORRECTION thumbwheel switches.
The test set is operated normally to test and troubleshoot
a platform and to perform a self-test of the test set.
(5) All other control-display unit and
Operation for performing test and troubleshooting
electronics unit switches are set to OFF or down position.
procedures on a platform are contained in the
b. Power Application.
maintenance manual for the platform being tested. To
(1) Turn on test set primary ac and dc power
perform test procedures on a platform, it is necessary to
sources.
set the LATITUDE CORRECTION thumbwheel switches
(2) Set control-display unit 28 VDC PRIMARY
to compensate for the earth's rotational velocity at the
and 115 VAC PRIMARY circuit breakers to ON.
specific latitude of the test site.
Instructions and
(3) Set electronics unit 115 VAC APH, 26
calculations for inserting latitude corrections are detailed
VAC, SE HEAT, and AMB HEAT circuit breakers to ON.
in paragraph 3-5. Test set self-test procedures are
(4) Set control-display unit 115 VAC switch to
included in paragraph 3-6. Under normal conditions, self-
ON.
test of the test set should be performed after installation,
(5) Set control-display unit 28 VDC switch to
monthly when in continuous use, before each platform
ON.
test when used intermittently, or when the test set
(6) Verify that the 28 VDC, 115 VAC, and SELF
operational status is questionable.
TEST indicators light and that the ELAPSED TIME
meters on both units are functioning.
3-4. Operating Procedures
(7) Turn on ancillary test equipment.
NOTE
NOTE
Before performing any operating proce-
Allow a 30-minute warmup for ancillary
dures, read and fully understand the
test equipment.
information in paragraph 3-2.
c.
Standby Condition.
a. Preliminary Control Settings.
Verify the
(1) Set control-display unit 28 VDC switch to
following test set conditions or perform the necessary
OFF.
operations:
(2) Set control-display unit 115 VAC switch to
(1) Test set primary ac and dc power sources
OFF.
are off.
(2) Control-display unit 28 VDC and 115 VAC
NOTE
switches are set to OFF.
Maintain test set in standby condition at
(3) Control-display unit 28 VDC PRIMARY
all times except when moving test set to
and 115 VAC PRIMARY circuit breakers are set to OFF.
a new location.
(4) Electronics unit 115 VAC APH, 26 VAC,
SE HEAT, and AMB HEAT circuit breakers are set to
OFF.
3-6
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