11
Basic Operation and Description
Power Line Indicator
The electromagnetic fields radiated and detected by
the M-Scan from 50 or 60 Hz power lines are indicated
by the triangular warning sign in the bottom left of the display.
The end of sensor tube needs to be close to conductors
exhibiting mains voltage in order to be detected so caution
is always necessary.
Notes:
1. Shielded cables (e.g. those in a steel conduit or armour)
will not be indicated.
2. There indication of power lines is visual on the display.
Erase
When nearby large metal objects, such as fencing or a shipping
container, swamp the M-Scan with signal it is possible to mask
out the background field by pressing the Erase button
to make it function in this high field situation. The display
will momentarily show the letters ‘ tun ’ to confirm that
the erase has been activated and the M-Scan has re-zeroed.
It may also be necessary to decrease the sensitivity to totally
remove strong interference.
To turn the erase function off and return to the manufacturer
pre-set zero, press the power on/off button twice. If difficulty
is experienced re-zeroing the M-Scan reduce the sensitivity
and retry.
Submersion in Water
The sensor tube section of the locator can be submerged
into water but not further than where the tube enters
the body of the M-Scan. The plastic housing should
be kept out of water at all times.
Searching
Hold the M-Scan at 45° to the ground. Scan from side to side
keeping the end of the sensor tube at the same distance from
the ground. Move over the ground in a searching pattern while
sweeping from side to side marking any objects found and then
continuing the search. It is best to do this grid search again
at 90° to the first search. Once the selected area has been
searched the objects found can be pinpointed by holding
the M-Scan vertically and traversing the object in one direction
and then across it at 90° to find the centre.
Different targets will give different signal profiles and with
experience it is possible to identify the size and shape of
the objects found. More details are in the Application Notes.
Summary of Contents for M-SCAN
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