To adjust the threshold tone, turn the THRESHOLD knob clockwise
until you hear a slight but steady tone. You will have to turn the knob to
somewhere between the 10 o'clock and 1 o'clock position to get the best
hum.
In the field, some targets may be small enough or deep enough that
they will not be able to generate an audio signal by themselves. By mon-
itoring a threshold, you already have an audio signal so changes in vol-
ume will be easier to hear. However, if the threshold is set too soft or too
loud, small changes in the signal will be hard to hear. Take some time to
find the threshold level right for you.
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