JRC Handy Search NJJ-95B, Instruction Manual

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2.3.6
Depth calibration
The depth calibration is the scan depth obtained from the wave propagation speed and reflected
time with the depth gauge corrected using the relative dielectric constant of concrete. The value
must be changed based on the condition (such as moisture content) of the concrete being scanned.
A large difference between the relative permittivity of the concrete being scanned and the depth
calibration value will cause a large depth error.
In order to reduce the depth error, detect an object where the depth can be confirmed (as with
rebar) and peform a correction of the depth guage by setting the depth calibration value so that the
depth displayed in the scanning results basically matches the actual depth.
If it is not possible to scan an object (such as the case with rebar) where the depth can be
confirmed, and the depth calibration value is unclear, it is recommended to set the depth calibration
to “08.0 (+0)”.
In order to change the depth calibration value, select “Depth Calibration” from the set up items
using the ▲▼ cursor keys (invert display) and switch to item selection using the cursor keys.
Set the “depth calibration value” using the ▲▼ cursor keys and use the cursor keys to
switch to item selection.
Remarks
● The intervals on the depth gauge are not equivalent. Confirm the depth using the cursor
display value.
2.3.7
Date, time
This radar contains a rechargeable button-type lithium battery with which dates and times can be
recorded.
In order to correct time and/or date, select “Date and Time” from the set up items using the ▲▼
cursor keys (invert display) and switch to item selection using the cursor keys.
Select the position of the date or time that you would like to correct using the cursor keys
and change the values using the ▲▼ keys.
Switch to item selection using the keys.
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