Sensors & Software pulseEKKO Product Manual page 128

System Configuration
The pulseEKKO Ultra receiver (Model 3200) allows the user to acquire data thousands of times
faster than the PRO model 1600 receiver. This increased speed allows the user to stack up to
65,536 times, resulting in a reduction of the noise floor which can achieve up to double the
depth of penetration in certain conditions. Collected data is recorded in a 32-bit format. If this is
the one connected, select this and then press Back.
6.1.8 Velocity
To obtain an accurate depth axis on the display, or to calculate the estimated depth of an object,
it is essential to know the propagation velocity of the GPR wave into the ground.
If you have obtained the velocity, or know the type of soil conditions, you can set it by pressing
Velocity to display the screen in Figure 6-11, where the velocity can be set.
Figure 6-11: Setting GPR velocity (in US Standard units)
The table in Figure 6-11 shows typical velocity values for various soil media. It will display in
whatever the selected measurement Units (5.1.2) are. The current velocity setting is shown at
the bottom of the screen, along with corresponding dielectric constant (K). Velocity and
dielectric constant are related by the following equation:
where v is the velocity, c is the speed of light, and K is the dielectric constant.
Press the numbered buttons to increase or decrease the velocity by the listed values.
Press the + and – buttons under Media to select between the different soil media options
shown, or directly touch the velocity value button on the screen corresponding to that media.
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