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EIA Test Theory.
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TM-9-4931-363-14-P Fire Control Subsystem Test Set AN/GSM-249 P/N 2201736-05 Manual
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EIA Test Theory. - continued - TM-9-4931-363-14-P0037
TM 9-4931-363-14&P
z. Refer to step 25 in figure 2-6 and in the EIA test
ad. Refer to step 29 in figure 2-6 and in the EIA test
table. With S5 set to position 3, the gunner elevation error
table. With other switch positions remaining the same and
signal output from the A13 card in the EIA is connected
S9 set to position R3, the R3 output of test set resolver B1
is connected to the meter and A2 card for readout. This
through J1-p, through J1-R, through contacts 8 and 9 of
S9, and through S5A to the meter and A2 card for display.
test checks buffer amplifier A1.
The other connections remain the same as in v (step 21).
With no input signal to the A13 card from the linkage, R4
ae. Refer to step 30 in figure 2-6 and in the EIA test
is adjusted for a null. (The inputs to amplifier card A13 in
table. Setting S3 to position 2 connects the same excitation
the EIA are grounded through EIA J3-46 and J4-28 to
inputs to buffer amplifier A3 in the EIA as were connected
insure that the readout is not affected by these inputs
to A1. The buffer amplifier outputs are connected to the
during this zeroing.)
test set resolver as shown in figure 2-6. The R2 output from
the test set resolver is connected for readout on the meter
aa. Refer to step 26 in figure 2-6 and in the EIA test
and A2 card.
table. With other switch positions remaining the same and
S9 set to position R3, the pilot azimuth error signal output
af. Refer to step 31 in figure 2-6 and in the EIA test
from the A13 card in the EIA is connected through J1-Z,
table. Setting S9 to position R3 connects the R3 output of
through J1-F, through contacts 7 and 9 of S9, and through
the test set resolver to the meter and A2 card for readout.
S5-A to the meter and A2 card for display. With no input
signal to the A13 card from the linkage, R3 is adjusted for a
ag. Refer to step 32 in figure 2-6 and in the EIA test
null. (The inputs to amplifier card A13 in the EIA are
table. Setting S3 to position 3 connects the excitation
grounded as in z (step 25).)
inputs to buffer amplifier A5 in the EIA. With S9 set to
position R2, the R2 output of the test set resolver is
ab. Refer to step 27 in figure 2-6 and in the EIA test
connected to the meter and A2 card for readout.
table. With other switch positions remaining the same and
S5 set to position 2, the pilot elevation error signal output
ah. Refer to step 33 in figure 2-6 and in the EIA test
table. Setting S9 to position R3 connects the R3 output of
from the A13 card in the EIA is connected through J1-E,
through J1-E in the test set, through contacts 4 and 6 of
the test set resolver to the meter and A2 card for readout.
S9, and through contact 3 and wiper 1 of S5-A to the
meter, and through contact 9 and wiper 2 of S5-A to the
ai. Refer to step 34 in figure 2-6 and in the EIA test
A2 card. With no input signal to the A13 card from the
table. Setting S3 to position 4 connects the excitation
linkage, R1 is adjusted for a null. (The inputs to amplifier
inputs to buffer amplifier A7 in the EIA. With S9 set to
card A13 are grounded as in y (step 24).)
position R2, the R2 output of the test set resolver is
connected to the meter and A2 card for readout.
ac. Refer to step 28 in figure 2-6 and in the EIA test
table. The 10 volts ac, phase angle 0 degrees, is connected
aj. Refer to step 35 in figure 2-6 and in the EIA test
through wiper 1 and contact 4 of S4-D, through wiper 1
table. Setting S9 to position R3 connects the R3 output of
and contact 2 of S3-A, through J1-B, and through J1-B of
the test set resolver to the meter and A2 card for readout.
the EIA as one simulated turret input. The 5 volts ac, phase
angle 0 degrees, is connected through wiper 1 and contact 4
ak. Refer to step 36 in figure 2-6 and in the EIA test
of S4-F, through wiper 1 and contact 2 of S3-C, through
table. Setting S3 to position 5 connects the excitation
J1-A, and through J1-A of the EIA as another simulated
inputs to buffet amplifier A2 in the EIA. With S9 set to
turret input. These inputs excite buffer amplifier A1 in the
position R2. the R2 output of the test set resolver is
EIA and the buffer amplifier outputs are brought to the
connected to the meter and A2 card.
resolver in the test set for readout. The buffer amplifier
outputs at J3-5, -6, -1, -2, -8, and -3 are connected
al. Refer to step 37 in figure 2-6 and in the EIA test
respectively through J1-x, -AA, -Y, -BB, and -z, and through
table. Setting S9 to position R3 connects the R3 output of
the test set resolver to the meter and A2 card for readout.
J2-a of the test set to test set resolver B1. The R2 output of
test set resolver B1 is connected through contact 4 and
am. Refer to step 38 in figure 2-6 and in the EIA test
wiper 1 of S4-I, through contacts 2 and 3 of S9 set to
table. Setting S3 to position 6 connects the excitation
position R2, and through S5-A to the meter and phase
inputs to buffer amplifier A4 in the EIA. With S9 set to
detector card A2 for readout.
2-20

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