PDP User's Guide
PDP Collection Software
29
•
Density Offset
–
used when calculating Density. This applies a shift in the
data. A user would input a density offset value to bring the PDP surveyed
measurements in line with that from a core sample or possibly calibrated
nuclear gauge measurement.
•
Density - Site Specific
-
A
,
B
&
C
coefficients, as well as
Maximum
Density
are used in a polynomial equation that accurately transform
permittivity to density (this is explained in Appendix G:). Once cores are
obtained, these coefficients can be calculated from the PDP Toolkit software.
The coefficients can be input here so subsequent PDP measurements will be
accurate. The more accurate the information obtained, the more accurate
the future PDP measurements for that section of road.
The above 4 values are required before data can be plotted showing Density-
Site Specific, Relative Density and Air Void Content.
The details on measuring maximum density are part of AASHTO Designation
PP 98-xx, where xx is the revision number.
Data Range
: Controls the display of data on the vertical axis on the main display.
If set to
Auto
, the labels on the vertical axis will display the full range of data. If
set to
Manual
, the user can set the min and max values accordingly.
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Страница 90: ...PDP User s Guide Appendix B GPR Emissions Interference and Regulations B 8 ...
Страница 92: ...PDP User s Guide Appendix C Instrument Interference C 2 ...
Страница 94: ...PDP User s Guide Appendix D Safety around Explosive Devices D 2 ...
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