A complete test consists of five individual measurements taken in a “cloverleaf” pattern at the test location.
Each of the five measurements takes about 10 seconds. The SDG 200 is placed in position 1 for the first
measurement and moved clockwise around position 1 as indicated in the illustration above. Upon completion
of each reading, the SDG 200 will prompt the operator to move to the next location.
While the SDG 200 unit stands off from the soil, surface condition is still important. It is necessary for the soil
surface to be free from any loose and disturbed material, stones, large air pockets or ‘divots’ and other debris.
It is also important that the soil surface be smooth. If it is not, smooth out the surface or move the unit to a
location where the surface is smoother. The SDG 200 should not rock side-to-side when placed in a location to
take a measurement; if it does, move to a new location or remove the obstacle that is causing the rocking being
careful to not measure on top of any ‘divot’ left by removal of the object.
Large metal objects should not be within three feet of the gauge or underneath the soil while taking
measurements. Measurements within ten feet of buried power lines should be avoided. When possible,
measurements taken with an SDG 200 near an edge or vertical obstruction should be taken at least three inches
from that edge.
When placing the SDG 200 at a location for a measurement, do not push down on the unit to ‘seat’ the
unit in place. Set the unit down on the surface and check to see if it rocks side-to-side.
Do not touch the SDG while it is taking a measurement.
Part 2: Running a Test
Measurement Pattern
Surface Preparation
24
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