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Figure 5-6. Low-inertia motor test circuit schematic diagram.
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TM-11-6625-2843-14 Test Set Synchro TTU-23/E Manual
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Figure 5-7. Servoamplifier, simplified schematic diagram
TM
11-6625-2843-14
AMPLIFIER GAIN control R201 rotated fully clock-
voed indicator control transformer until the error sig-
wise. With this test setup, the stators of the transmit-
nal to the servoamplifier is at null, At this point, the in-
ter under test and the control transformer of indicator
dicator rotor is at correspondence with the rotor of the
B202 are connected back to back; and the rotor of the
differential under test.
transmitter under test, servoamplifier A201, and the
5-11.  Self-Test  Circuit
fixed-phase winding of the low-inertia motor are
a. The  self-test  circuit  (fig.  FO-3)  is  enabled  by
energized by 26 volts. This test configuration is essen-
TEST SEL switch S203 at TRANS, AMPLIFIER
t i a l l y the same as that of the transmitter test circuit
G A I N control R201 rotated fully clockwise, and test
for servoed indicators (para 5-5 and fig. 5-6), except for
plug H (QB83704-1), which shorts pins A, B, and D of
a functional exchange between the indicator and
connector J201 to pins E, F, and H, respectively. With
transmitter. In the present test, servoed indicator B202
this test setup, the circuit is functionally identical with
is the reference for the transmitter under test; and in
the indicator test setup for transmitters (para 5-7 and
the transmitter test circuit, transmitter B201 is the
fig. 5-6), except the transmitter under test is replaced
reference for the indicator under test.
i n the self-test circuit by transmitter B201. Thus, an
indicator track of the transmitter within 15 minutes
Indicator
Test
Circuit
for
Differen-
assures proper operation of transmitter B201, indica-
tials
tor B202, and servoamplifier A201.
The indicator test circuit for differentials (fig. FO-2) is
b. With TEST SEL switch S203 set at DIFF, the cir-
enabled by TEST SEL switch S203 at DIFF and
cuit is essentially the same as the indicator test circuit
AMPLIFIER GAIN control R201 rotated fully clock-
for differentials (para 5-8 and fig. 5-8), except in the
wise. With this test setup, the stator of indicator B202
present test setup, the stators of locked synchro B203
and a stator of the differential under test are con-
and indicator B202 are connected back to back. Thus,
nected back to back, and the stator of locked synchro
with the TEST SEL switch at DIFF, an indicator drive
B203 and the remaining differential stator are con-
to 0 0.1 degree assures proper operation of lock syn-
nected back to back, and the rotor of locked synchro,
chro B203.
servoamplifier A201 and the freed-phase winding of
indicator B202 are energized by 26 volts. The stator
5-12.  Servoamplifier  Circuit
o u t p u t of the locked synchro excites the differential
Servoamplifier circuit (fig. 5-7) is used in test circuits
under test, and the output of the differential excites
that contain a servoed indicator. As such, it boosts the
t h e stator of the test set servoed indicator control
signal applied to the rotor of the servoed indicator con-
transformer. The signal induced into the indicator
trol transformer by the amount required by the low-in-
rotor is amplified by the servoamplifier and applied to
ertia drive motor. The servoamplifier is made up of a
the variable-phase winding of the law-inertia motor of
full-wave, center-tapped silicon rectifier, two dual
indicator B202. The motor rotates and drives the ser-
triodes and an output transformer.
5-8

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