SPECIAL CALIBRATION
The Special Calibration features allow the operator to recalibrate
Model 3450 soil and thin layer readings. Special calibrations are
specific for the test material and measurement depth. The gauge can
store four density special calibrations and four thin-layer special
calibrations.
NOTE
When turned off, the gauge disables all special
calibrations and offsets.
Before performing a special calibration:
1.
Prepare the sample area for testing as described in Chapter 4.
2.
Take gauge measurements on each area.
3.
Take a density measurement using an alternate method.
DENSITY SPECIAL CALIBRATION
The factory calibration provides accurate results for the majority of
materials encountered in the field. However, there are situations
when varying material compositions and/or texture could affect the
gauge accuracy.
The Special Calibration function allows the operator to recalibrate
the Model 3450 gauge for material characteristics not covered by
the factory calibration. The true density is typically determined by
measuring samples of a known material in a laboratory.
The Special Calibration function is activated only in Soil mode.
To access the Special Calibration function, press the
〈SPECIAL〉
key. At the Special functions menu, press 〈1〉 to access the Special
Operation menu. Press 〈1〉, the gauge displays the Special
Calibration menu:
1-Enable Spec Cal
2-Disable
4-New
3-View 5-Erase
6. OFFSETS & CALIBRATIONS
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