MEMS Digital Inclinometer System with Android
Instruction Manual
ICM0099A
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Absolute Position
The Digital Inclinometer app generates graphs based on the available data collected during
the reading process. For borehole depths that have not yet collected readings, the lines are
interpolated with dotted lines instead of solid lines. Figure 24 show sample graph types with
data collected up to a depth of 6 meters.
Figure 24
– Sample Absolute, Mean Deviation and Checksum plots
Checksum
Checksum in A+/A- plane = A+ plus A-
Checksum in B+/B- plane = B+ plus B-
Checksum should be reasonably constant and of small magnitude, large and inconsistent
Checksums may indicate that a problem exists. However, the consistency of checksums
from survey to survey is more important than the actual value of the checksums. Checksum
data should be monitored during the survey as a check on data integrity. Note that high
checksums can be expected if a settlement coupling has been encountered, a checksum of
the order of (+0.0045m and -0.0035m) or (+0.0147ft and
–0.0114ft) would be reasonable at
consecutive depths/couplings.
Mean Deviation
A+/A- mean deviation in the A+/A- plane = (A+ minus A-)/2
B+/B- mean deviation in the B+/B- plane = (B+ minus B-)/2
This represents the mean deviation at each depth.
Absolute Position
An Absolute Position value at a particular depth is the summation of mean deviations
starting from the bottom up to that particular depth. Absolute position is the profile of the
access tube with respect to the vertical axis in a given plane. Absolute position can also be
calculated from the top down, if required,
using Inclinalysis™ software.
4.3.12 E
XPORT READING
F
ILES
O
VERVIEW
The Digital Inclinometer app supports features for measurement and data visualization at the
borehole. Data readings may also be exported to remote facilities for offline analysis
packages such as the RST Inclinalysis™ software.
