DFX 300 Manual - White's Metal Detectors

Chapter 5 DFX Pro Options
40
Tips - Hot Rocks are often
described or categorized
as either negative/magnetic
(cold rock) or positive/conductive
(hot rock). Typically
a negative or magnetic
“cold rock” will respond in
the search mode, however,
once the trigger is
squeezed for pinpointing it
ceases to respond. A positive
or conductive “hot rock”
will continue to respond
during pinpointing.
If hot rocks are a problem
in the area being searched,
in most cases a HOT
ROCK REJECT setting can
be found that will minimize
their target like responses
compared to real metal
target responses in the +95
category. Settings from
1 - 20 are available.
(Discrimination section)
19. Hot Rock Reject
Hot rocks (rocks higher or different in mineralization
than the surrounding ground) respond as +95
on the V.D.I. scale. Unfortunately in some ground
conditions very deep, small, or unusual real metal
targets may also indicate +95. In the past an operator
would either accept +95 with the DISC EDIT
feature and hear hot rocks as a target response
“beep”, or reject +95 and not hear a target like response
from + 95 target types.
The HOT ROCK REJECT features allows a compromise
between total rejection or total acceptance
of the + 95 V.D.I. indication. Disc Edit Accept or
Reject of +95 will only control the visual displaying
of +95 with the Visual Discrimination feature ON.
To reject or accept +95 with the audio discrimination,
Audio DISC must be on, and the HOT ROCK
REJECT feature adjusted for your preference-regarding
+95.
A HOT ROCK REJECT range of 0 to 20 is provided.
At 0 the same characteristics can be expected
as EDIT ACCEPT +95 has provided with past
Whiteʼs models. At 20 the same characteristics can
be expected as EDIT REJECT +95 provided with
past Whiteʼs models.
At 10 a compromise between accepting +95 and
rejecting +95 is achieved. A hot rock may or may
not produce a target like response depending upon
many factors such as the actual size of the hot rock,
degree of difference between the hot rockʼs mineralization
and the surrounding ground, the current
ground balance setting, and the Sensitivity/Gain
settings.
Hot Rock Reject provides for 19 shades of gray between
totally accepting all hot rocks (0), and totally
rejecting all hot rocks (20).