X-Axis; Depth; Date/Time - JRC NJJ-105 Handy Search User Manual

2.3.5 X-axis

You can specify the scan mode by this parameter. The available settings are distance (distance
feed) and time (time feed). When distance is selected, this product scans and displays the
scan result in units of 2.5 mm in the B or BA-mode display with synchronizing the wheels' moving
distance. When time is selected, this product scans and displays the scan result at 50 ms
intervals in the B or BA-mode display, regardless of the wheels' moving distance. Set a desired scan
mode to this parameter in accordance with the procedure described in section 2.3.

2.3.6 depth

You can specify the depth calibration value (correction constant used for the depth calibration) by
this parameter. Enter the relative dielectric constant of the concrete being scanned to this parameter.
For the relative dielectric constant, refer to Glossary of Terms.
This product corrects the depth guage by using the depth calibration value (relative dielectric
constant of the concrete) entered in this parameter. The relative dielectric constant depends on the
condition (such as moisture content) of the concrete being scanned. Therefore the more difference
between the actual relative dielectric constant of the concrete and the entered value, the more the
depth error. Set an appropriate value to this parameter in accordance with the procedure described
in section 2.3.
In order to reduce the depth error, perform the depth calibration before the scanning by
performing the following procedure. Scan the object whose actual depth is known (Ex. the rebar with
a known depth) and detect the depth of the object. Then adjust the depth calibration value so as the
depth value displayed in the scan result matches the known depth. If the object with the known
depth is not avaialble and the relative dielectric constant of the concrete is unclear, it is
recommended to set 08.0 (+0) to this parameter.
Remarks
• Each interval between neighboring two scales on the depth gauge is not same. Use
the depth value (Y) displayed at the cursor coordinates or cursor marker coordinates.
• The right hand side of the display field for the depth calibration value displays the
depth value (Y) at the cursor position.

2.3.7 date/time

You can set the date and time by this parameter. This product keeps and updates the date and
time in an internal non-volatile memory powered by a built-in rechargeable button-type lithium battery.
Set the correct time and date to this parameter in accordance with the procedure described in
section 2.3.
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