C.Plath NAVIGAT X MK 1 Mod. 10 Operator's Manual page 58

NAVIGAT X MK 1 Mod. 10 / SR-180 MK 1 Mod. 10
Function test
1) Energize the gyrocompass system.
2) In the service setup 2, select the gyrosphere data sub-menu.
Observe the gyrosphere current:
Directly after power-up, the gyrosphere current should not exceed 550 mA.
The current will gradually fall while the gyrosphere settles.
Within 45 minutes after power-up, the gyrosphere current must have dropped
below 300 mA.
If, after 45 minutes of operation, a gyrosphere current above 300 mA is dis-
played in the gyrosphere data sub-menu, measure the AC-voltage present
across resistor R150 (1Ω) on the masterboard. The voltage across R150 in
mV equals the gyrosphere current in mA.
Caution:
If 45 minutes after power up, the gyrosphere current has not dropped below
300 mA, the gyrosphere is defective and must be replaced.
Page 5-14
... GYROSPHERE DATA .
. TEMPERATURE ... 40 °C .
. PH.BRIDGE ..... 10 mV .
. GYRO CURR . .... 234 mA .
After initial power-up, gyrosphere
current must drop below 300 mA
within 45 minutes.
056310
3-149 MK110ENG.P65