DTI GmbH & Co. KG
Another parameter which influences the detecting is the “OBJECT SIZE”.
Again set the parameters to factory settings. Chose the parameter “OBJECT SIZE”
by pushbutton ‘F1’. By this parameter you can filter out small objects in low depth or
big objects at the edges of the coil. You can compare that to following process:
You detect a coin, increase the height of the coil until the detection signal vanishes.
A little distance far away there are several coins. You will have a signal at the same
height. Go back to the single coin. If you now increase the “OBJECT SIZE” – object
size – at a height you had before until the signal vanishes, you will not see this single
coin any more, even if it was lying directly above a bigger object. A bigger object lying
deeper can be filtered out in the same way. Big objects always have the characteris-
tic that they produce a constant signal above the complete area. Mineralized soils
have the same characteristic and can be filtered out in the same way.
When testing this parameters do as with the ‘SEARCH MEMORY’. The searching
memory should always be set to 10 – 15.
By this parameter also frame coils will be calibrated. This parameters are working
with frame coils 50 cm – 200 cm x 100 cm. Do a reference when using this coils by
turning them by 90° - the active area showing in direction of air.
Now turn the active area to the soil. You will get a permanent signal. Increase the
height above the soil and check a bigger area. Now increase the “OBJECT SIZE”
until the signal makes changes during movement above the area.
Not again do a reference (coil showing to the air). Never do a reference with the
active area of the coil showing to the soil. Do the calibration step by step – parameter
reference and parameter object size. The second possibility is you are receiving no
signal but the right part of the spectrum display shows a reaction. This corresponds
to the description below ‘SEARCH MEMORY’. Increase the “OBJECT SIZE” until the
detection signal shows up again. Do a reference as described.
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