How To Determine Depths And Sample Scan Test Data - JRC Handy Search NJJ-95B Instruction Manual

3.5 How to Determine Depths and Sample Scan Test Data

The reflected waves shown in the scan test example in Figure 3-16 are reflections of rebar. (↓
position)
The position of the object to be probed (e.g., reinforcing steel) in the traveling direction is
determined as the peak of the reflected wave.
An approximate depth (covering depth) of the object to be probed (e.g., reinforcing steel) is
determined as the center of the reflected wave.
Perform depth calibration (see section 3.2.6 "Depth Calibration") to reduce the error in the depth
(covering depth) of the object being probed (such as rebar). Use the A mode waveform from BA
mode (see section 3.3.1 "Mode Switching") to determine the position of the object to be probed.
The position of the object to be probed (such as rebar) is shown by the peak on the right side of
the A mode waveform.
Match the cursor to the peak position to determine the depth.
- 52 -