White’s Electronics TDI - Manual (Page 18)

8 PulseScan TDI Owner’s Guide
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
pulltabs will also be heard. Very low pulse delays can also result in the detection
of conductive salt water when detecting along beaches.
If you were primarily looking for high conductive metals, such as silver,
increase the Pulse Delay toward the maximum setting of 25 uSeconds,
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 if necessary.
MORE about Pulse Delay is listed under PULSE DELAY on page 30 of this
Guide.