Offsets
The factory calibration provides accurate results for the
majority of materials encountered in construction. If the gauge
is to be used to test materials not covered by the factory
calibration, the readings can be adjusted using an offset.
Perform a density offset if the test material is outside the density
range for average soil or if the material composition varies from
average soil.
Vertical structures may scatter gamma photons back to the
gauge. This could result in inaccurate density readings. To take
readings in a trench or within 0.6 m (2 ft.) of a large vertical
structure, perform a trench offset.
A moisture probe offset should be used when the moisture
content of a laboratory sample differs from the reading
provided by the Troxler Moisture Probe Model 6760.
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