Geokon GK-604D, User Manual

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The procedure for setting the face error to zero is described in section 4.2
which covers the subject of “Zero shifts” which are the same as “face
errors”. The advantage of this method lies in it’s simplicity and the ability
to set the “face error” to zero at any time without dismantling the probe.
This is the method chosen by Geokon.
Another advantage of this method is that it is possible by judicious choice
of the “face error” entered into the software program to make one probe
give exactly the same digits output as another probe. This is sometimes
thought to be desirable where probes are switched and unbroken
continuity of the raw data is desired. It is not necessary for reason of
accuracy as has already been explained.
The disadvantage of this method is that, if the probe is changed, the
operator must remember to change the zero shift offset in the program to
accommodate the “face error” of the new probe.
A.3.4 Conclusion
It has been shown that for most practical purposes check-sums of less than
2000 digits are of no consequence and can be completely ignored providing the
inclinometer survey is conducted in the normal way. (i.e.2 sets of readings at
180
°
) It has further been shown that the best method by far, for setting the
“face error” to zero, is by means of the software capabilities in the inclinometer
reader. This is the method chosen by Geokon.