Geometrics Inc. G-882 Cesium Marine Magnetometer Page
A. The magnetometer reading will be erratic as the sensor begins to
warm up.
B. Analog channel 0, the signal level, will be around 0010 and will
increase during warm-up.
C. Analog channel 1, the depth sensor, will exhibit a value near 0100
(unscaled) with the G−882 in air, out of the water. If no depth
sensor is installed in the G−882, the value could vary between
0000 and 0050.
D. Analog channel 2, the altimeter, will exhibit a value near 9900
(unscaled) with the G−882 in air, out of the water. If no altimeter
is installed in the G−882, the value could vary between 0000 and
0050.
If the additional diagnostic analog channels are enabled, the
following may be observed:
E. Analog channel 3, the brightness, will exhibit numbers beginning
about 3400, jump to 4300 after a minute or two and then slowly
rise towards a number around 5600 as the magnetometer warms
up.
F. Analog channel 4, the RF, will exhibit numbers beginning low,
fairly quickly ramping up to some high numbers and as the
magnetometer warms up slowly settling down to a number around
2100.
G. Analog channel 5, the heater, will exhibit numbers beginning low,
very quickly ramping up to some numbers as high as 3400 (this
final value will be determined in part by the ambient temperature)
and then settling down to a number around 1600.
H. Analog channel 6, if not used, could vary between 0000 and
0050. As shipped, jumpered to an internal voltage, 28V, analog
channel 6 could immediately exhibit numbers between 5005 and
7890. If used for an external input (this capability not currently
implemented in the G−882), the values will depend upon the
characteristics of the user device attached.
I. Analog channel 7, if not used, could vary between 0000 and
0050. As shipped, jumpered to an internal voltage, 21V, analog
channel 7 could immediately exhibit numbers between 4600 and
5300. If used for an external input (this capability not currently
implemented in the G−882), the values will depend upon the
characteristics of the user device attached.
3. When the magnetometer is warmed up the following may be observed:
A. If the magnetometer is properly oriented to the ambient field and
not near any large metal objects, a reading indicating the
magnitude of the ambient field will be observed.
B. Analog channel 0, the signal level, depending on the field
magnitude and sensor orientation, a normal signal could vary
between 0900 and 1200.
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