Pulse Delay - Whites TDI SL Owner's Manual

A lower threshold makes the TDI quieter and less chattery
but also requires a stronger target signal to produce a tonal
response:
A lower threshold can be played off against a higher
ting, although you may find that the net outcome is about the
same.
Setting the threshold exceptionally low can result in a
"silent search" audio, whereby there is no audio sound until a
target is detected:
The drawback is that sensitivity can be markedly reduced and
weaker targets completely eliminated. However,
increased to counter this, though the net result is still likely to
be less sensitivity than an optimally adjusted threshold.

Pulse Delay

Sampling as close as possible to the end of the transmitted
pulse gives the highest sensitivity to all metal targets regardless
of their size or conductivity. As the
toward 25s low-conductive targets will drop out, leaving only
the more high-conductive targets.
Conductivity is not the only factor that determines how tar-
gets respond; size, thickness, and shape also have a strong influ-
TDI SL
Owner's Manual
Page 17
Gain
is increased
Pulse Delay
set-
Gain
can be