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| MIL-G-18853C(OS)
b. Using the two-wattmeter method, connect the wattmeters (Table
1, Item 3) between the 115-volt power source (Table I, Item 4) and pins
A-B-C of P601 on the rate gyro.
Note:
Voltage leads of wattmeters shall be toward the gyro input side.
c. Apply power and take starting power input readings after initial
surge subsides (two to three seconds after power application).
d. Correct scale readings obtained in 4.5.3.c by subtracting the
power loss due to the potential coils of the respective wattmeters. The
power, which is the sum of the corrected wattmeters readings, shall be
as specified in 3.5.2.
e. After the gyro has run a minimum of 1-1/2 minutes, note the
readings on the wattmeters.
(1) The sum of the wattmeters readings after correction for po-
tential coil power loss shall be as specified in 3.5.3.
(2) The response time for initial power application shall be as
specified in 3.3.11.
f. Connect the 55-volt power source (Table I, Item 5) in series
with the multimeter (Table I, Item 6) to pins D-E on P601. The current
shall be 21 3.15 ma.
g.
Connect the resistive load (Table I, Item 7) across pins F-H on
P601.
h. Connect the vacuum tube ac voltmeter (Table I, Item 8) across
the resistive load.
i. Rotate
the turntable in
a clockwise direction, when viewed from
above, at three
speeds such that
the voltmeter reads 1 0.75 volts; 3
At each of the three speeds, record the
0.75 volts; and
5 0.75 volts.
voltage reading
and turning rate
in degrees per second.
j. Rotate the turntable in a counterclockwise direction, when
viewed from above, at three speeds such that the voltmeter reads 1
0.75 volts, 3 0.75 volts and 5 0.75 volts. At each of the three
speeds, record the voltage reading and turning rate in degrees per
second.
k. Using Figure 1, plot the six points recorded (three points in
4.5.3.i and three points in 4.5.3.j). These points must fall within the
limits of the shaded area of Figure 1.
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