TRENCH OFFSET
To use the Model 3450 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 and density measurements from backscatter to 4
inches. For direct transmission measurements over 4 inches deep,
only the moisture measurement needs to be adjusted. In the displays
shown below, TMO refers to trench moisture offset; TDO refers to
trench density offset values (one for each set of detectors).
Access the Offset menu by pressing the 〈OFFSET〉 key. Access the
Trench Offset menu by pressing 〈3〉.
The gauge displays the current trench offset values. To enable the
offset, press
〈1〉. To disable the offset, press 〈2〉.
To create a new trench offset, press 〈3〉. The gauge displays:
Select a position inside the trench and the same distance from the
wall as the test measurements. Place the gauge on the standard
block in this position. Press the
〈START〉 key.
TDO = xxxx xxxx
1-Enable 2-Disable
3-Change Offset
Press START For
1 Minute STD Count
In Trench
6. OFFSETS & CALIBRATIONS
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