TRENCH OFFSET
To use the gauge in a trench or within 0.6 m (2 ft) of a large vertical
surface, first perform a trench offset. The trench offset adjusts all
moisture measurements and density measurements from backscatter
to 4 inches. For direct transmission measurements over 4 inches
deep, the gauge will only adjust the moisture measurements. In the
displays shown below, M refers to trench moisture offset; D refers
to trench density offset values.
NOTE
Before determining a new trench offset, ensure that a
standard count has been performed recently outside the
trench.
To access the Trench Offset menu, press 〈3〉 at the Offset menu
shown on page
7–2. The gauge displays:
The gauge displays the current offset values on the second line.
To enable the displayed trench offset, press 〈1〉. The gauge
enables the offset, displays a brief confirmation message, and
returns to the Ready screen.
To disable the trench offset, press 〈2〉. The gauge disables the
offset, displays a brief confirmation message, and returns to the
Ready screen.
NOTE
The trench offset is also disabled when the gauge is
turned off.
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