TDI
Pr o
Owner ’s Gui de 19
How to use i t
PULSE DELAY is measured in microseconds (uS). 10 uS is the lowest
setting, which samples as close as possible to end of the transmitter
pulse. This setting gives the highest sensitivity to all objects regardless of
conductivity. However, raising the pulse delay toward 25 uS can minimize
ground mineralization signals and maximize the signal to high-conductive
metals such as silver or larger targets by suppressing the signal from low
conductivity targets. This setting can be set anywhere between 10 uS and
25 uS depending on the circumstances to enhance performance.
If you wish to concentrate on
detecting low-conductive targets
for maxi-
mum sensitivity, you would want to set your Pulse Delay as close to 10 uS
as possible for the ground being searched. Low-conductive targets would
include small to medium gold nuggets, small or thin gold rings, and chains
as well as very thin, small hammered silver coins. If you were detecting for
thin gold rings at a beach, this would also be the proper setting to achieve
the most sensitivity.
Of course, at 10 uS you will also hear small bits of iron trash, bits of foil,
boot tacks and bits of nails, and very small pieces of lead like bird shot.
You may hear nails when swept across the broadside, but not when
sweeping from tip to tip. Aluminum & pull-tabs will also be heard. Very
low pulse delays can also result in the detection of conductive salt water
when detecting along beaches. Typically 17.5 uS is the best Pulse Delay
when searching wet salt.
If you were primarily looking for
high conductive metals
, such as silver,
increase the Pulse Delay toward the maximum setting of 25 uSec-
onds,
thus reducing the signals from very small trash items such as small
iron and foil. Large iron usually falls into the category of silver, and gives
a stronger signal at higher Pulse Delays as well. One important thing to
remember is that whenever you change your Pulse Delay, you should
check and readjust your ground balance as necessary.
