White’s Electronics Prizm 6T - Manual (Page 14)

14
Prizm™ 6T
5. Depth Indication -
A. The depth of coin-sized metals is automatically indicated on the left-
hand portion of the display. When in the pinpoint mode (P/P button
pressed and held) the large numerical number, which normally shows
the VDI target reference, changes to show a more specific depth
indication. 80 = 8 inches, 75 indicates 7 1/2 inches. When P/P is
released, numerical number changes back to indicting target VDI
number.
B. Metals larger or smaller than typical coin size will skew this indica-
tion slightly. For example, a pop can will indicate very shallow, how-
ever, may in fact be found quite deep in the ground. A metal much
smaller than a coin will indicate quite deep, however, may be found to
be quite shallow in the ground. Whatever the finding regarding a
particular size, the results will be consistent. If the detector indicates a
target at an inch and after digging three inches the target is not located,
that item is larger than a typical coin.
C. Typically lighter metal targets, like the aluminum pull tab, remain at
fairly shallow depths. A TAB indication that indicates fairly shallow is
likely a TAB. However, gold is heavy (typically sinks more deeply into
the ground) and may also indicate in the TAB area of the display. A TAB
indication that indicates fairly deep should be dug, until it is determined
that deep tabs are also common to the area. Older, more collectable
coins are found at greater depths in the ground. Deep indications that
have questionable tone and display indications are more worthy of
investigation compared to questionable tone and display indications that
produce shallow depth indications.