Geometrics, Inc
.
G-856AX Operation Manual
21
5
Determine if the present tuning is valid. A signal level lower than 3 may indicate
poor tuning if the sensor is filled with one of the preferred fluids (e.g. Kerosene).
If this is the case we recommend returning to step #2 above and adjusting the tune
setting upward or downward by 500
nT.
Once you have obtained signal a strength indicating adequate tune, you can begin your
survey. If you wish to increase the signal strength, you will want to be more precise in
selecting the tuning value. You might want to take a reading and enter the first three
digits of that reading for the tuning value. Some trial and error is usually required to
realize the maximum signal strength possible. In general, maximum signal strength is
obtained when the tuning value matches that of the field. Signal strength levels of 6 to 10
are typical and should provide consistent measurement results.
5 - Automatic tuning
The G-856AX can be set to tune itself automatically. When the automatic tuning
function is activated, the tuning value is automatically updated after each field reading
unless a high gradient is present. To activate the automatic tuning function press:
AUTO, TUNE, ENTER
As this key sequence is pressed, something similar to the following displays will appear:
Auto
FIELD/TIME
11
STATION/DAY
A tunE
FIELD/TIME
oFF
STATION/DAY
and automatic tuning will be turned on.
Note: While the automatic tuning function is
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