6. Effect of Scan Location Relative to Secondary Bar
Generally, it is recommended that secondary (perpendicular) bars be located before cover
measurements on the target reinforcing bar are carried out. Once the secondary bars are
located, the probe can be place in between two secondary bars and be moved traverse across
to the target main bars (refer to Figure 6). Scan location relative to the secondary bars under
the main bars can affect cover measurement accuracy. However, extent of this effect has not
been fully studied.