54-0215 Rev. C
23
4.
With the gyro held stationary, the indicated mean (30-second average) input rate
should be less than 0.005°/s, excluding Earth rate. If no data is received, check the
wiring for proper data line connection. If a parity error occurs, check your
terminations.
To calculate the Earth rate for your geographical area, use the following
formula:
Earth rate = -15.04107 x sin(latitude)
Note: Northern latitudes are positive and southern latitudes are negative.
5.
Grasp the gyro and slowly rotate it in the direction of the arrow on its serial
number label. The output data should indicate a positive change.
6.
Slowly rotate the gyro in the opposite direction. The output data should indicate a
negative change.
7.
After the initial 5-second startup, the BIT indicator (at gyro pin 8) should show
TTL Low (less than +0.6 VDC) at all times. If the BIT shows TTL High (greater
than +2.4 VDC), the gyro has malfunctioned.
BIT information is also provided as part of the data message (at Bit 31).
