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Precession cont'd
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Gyro, Steering
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Static precession cont'd



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MIL-G-19027D(OS)
4.5.3 .7.11.5 Turn the gyro manually less than one degree in a clockwise
direction, as viewed from above.
4.5.3.7.11.6 In the northern hemisphere, if the voltage obtained from
4.5.3.7.11.5 decreases, then the creep is subtracted from the total drift
to obtain the error drift.
4.5.3.7.11.7 If the voltage obtained in 4.5.3.7.11.5 increases instead
of decreases, the gyro is drifting faster than the creep due to the earth's
rotation, and the creep must then be added to the total drift to obtain the
error drifts.
4.5.3.7.11.8 This completes this portion of the drift check. Disconnect
all power sources and remove all connections as shown in Figure 2.  Know
the gyro to cool to ambient.
4.5.3.8 Static precession. To measure the static precession as des-
cribed in 3.3.3.2:
4.5.3.8.1 Mount the gyro on the gyro test stand.
4.5.3.8.2 Connect the 10k potentiometer (4.5.2.7) across pins J and L
of P201 as a load, and connect the ac voltmeter (4.5.2.3) across this 10k
load also.
4.5.3.8.3 Cage the gyro by applying 26 volts dc to pins M-P of P201,
with M negative.  Apply 115 volts, 400 Hz, 3 phase to pins A-B-C of P201.
4.5.3.8.4 Allows 60 second minimum warmup time, then uncage the gyro
and rotate the gyro until a null is reached on the ac voltmeter.
4.5.3.8.5 Allow the gyro to run 10 minutes or longer uncaged. At the
end of that time rotate the gyro in the direction to obtain a null on
the ac voltmeter.  The time of the run and the number of degrees the gyro
was turned to obtain the second null should be recorded.  From these the
total drift in degrees per minute can be found.
4.5.3.8.6 The creep calculated in 4.5.3.7.9 shall be added or subtracted
from the total drift, as determined in 4.5.3.7.11.
4.5.3.8.7 The static precession shall be as specified in 3.3.3.2.
4.5.3.8.8 Remove connections made in 4.5.3.8.2.
4.5.3.9 Anticircular run contacts.
To check the ACR contacts, as set
forth in 3.3.5:
17

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