Humboldt HS-4210 Digital Static Cone Penetrometer - Manual (Page 4)

Procedures
A) Equipment Check
1) Before beginning a test, check to ensure the Drive Rod is straight by
rolling the rod on a flat surface. Drive Rod may have been bent if
overloaded vertically.
2) The Drive Cone Assembly must be checked to ensure proper movement
and that the point is discernable. The point may eventually become
rounded depending on the amount of use and types of material tested.
The original diameter of the cone is 0.544". Replacement should be
considered if the diameter is reduced to 0.528" or if substantial damage
occurs to the cone point.
B) Assembling
1)
Starter Rod: Insert starter rod in bottom of head assembly and tighten
with 7/16" wrench.
1) Extension Rod (if used): Attach extension rod either above or below
starter rod. (Inside rod on starter rod is shorter than that of extension
rod.) Tighten with 7/16" wrench.
2) Drive Cone Assy.: Attach to lower section and securely tighten with
7/16" wrench.
a) The standard 1.5 cm 2 Drive Cone Assy. is used in typical low
strength fine grained soft soils.
b) The optional 3 cm 2 Drive Cone Assy. is used in very soft, typically
uncompacted materials where readings in psf may fall below 2000
psf. Use of this cone requires that the displayed reading be divided
by 2 for the correction.
C) Testing Sequence
1)
Tare Display: This may be done by setting the DSCP on horizontal
surface and turning on while allowing weight of head to rest on cone.
Unit will tare automatically upon startup. Tare function may also be
achieved at any time while unit is on by allowing the unit to stand on
horizontal surface while allowing weight of head to rest on cone and
pressing the “Tare” button.
2) Select Units: Units desired for test may be selected by holding down
“MAX” button and at the same time pushing the “ZERO” button
which will scroll thru the units available.
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