Humboldt H-4114SD.3F Electrical Density Gauge - Manual (Page 10)

Select areas on the Job Site where the type of soil is consistent from place
to place, and where there are differences in water content and compaction.
Special preparation of spots of different densities or water contents should
be done the day before, so as to allow stabilization of the soil water content.
A matrix of six (6) spots should be used during the soil model calibration
procedure, which consists of two different soil density conditions and three
(3) water content conditions that cover the range that is expected to be
measured. The three calibration tests that evaluate high density soil will
use test locations that ideally will have soil conditions that are close to the
maximum density as determined by Test Methods D1557 or an equivalent
method. The range in water content should include low water content,
middle range water content, and high water content that is near the
optimum water content as determined by Test Methods D1557 and D2216
or equivalent test methods.
Once the Soil Model is developed, the EDG is ready to use by itself anytime
this specific tested material is used. Additional readings (points) can always
be added to the initial Soil Model. This allows you to provide more points
from which your curve is developed, refining it and making it more accurate.
Initial Setup:
1. Turn the EDG ON by pressing the POWER button on the keypad for a
few seconds and releasing.
(Once the EDG is on, please allow the EDG to warm-up for 5 minutes
before proceeding)
2. The EDG opens to the home screen shown below. From this screen you
can access the Soil Models or Job Sites sections, as well as the Setup
and Data Transfer sections. Since we want to develop a Soil Model,
press the Soil Models button with the red helmet.
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