Concrete Cal - Sensors & Software CONQUEST 100 User Manual

Conquest 100 Line Scan
Figure 6-13: Gain is used to amplify the signal to enhance the weaker targets. The same GPR Line is displayed with
gain values of 1, 3, 5, and 8. A gain of 1 is under-gained and you might miss something. A gain of 8 is over-gained
and difficult to interpret.

6.8.6 Concrete Cal

An accurate Concrete Cal is critical for determining the depth of an object in the subsurface
(Section 2.3 explains the rationale of doing Concrete Cal). You should adjust this value
whenever you move to a different site (or different concrete pour).
The last used Concrete Cal is displayed on the Concrete Cal button. Once you have collected
data with one or more hyperbolas on the screen, press Concrete Cal; this can be done during
data collection, back-up mode or when stopped. You will see the image in Figure 6-14.
69