DFX 300 Manual - White's Metal Detectors

Multi Frequency Method
Only one of the four available multifrequency
methods, BEST DATA, CORRELATE, 1 kHz,
and 15 kHz, can be "ON" at any one given
time. For example if BEST DATA is "ON",
the remaining three multifrequency options
are automatically "OFF". To turn BEST DATA
"OFF", requires the selection of one of the three
remaining methods. In other words, an operator
never turns "OFF" a multifrequency method,
they simply select the desired method and turn
it "ON", all other methods are automatically
turned "OFF."
The MULTI FREQUENCY selection in use
appears continuously on the bottom of the LCD
display during searching. The ideal multi frequency
or single frequency setting will depend
on many different factors such as the amount,
degree, and type, of ground mineralization, the
types of metal alloys most desired, as well as
personal preferences. No one setting will be ideal
for all situations. A user should fi rst trust the
factory preset settings for the general types of
searching and then experiment to fi nd the most
ideal settings for that particular area and type
of search. Generally multi frequency settings
are better suited to areas that have both magnetic
(iron) and conductive (salt) components.
Inland areas may vary in this regard with the
soils moisture content. For example dry soil may
present mostly iron type characteristics possibly
making one of the single frequency modes a
better choice. The same area when the soil is wet
may exhibit conditions similar to a combination
of both iron and salt due to nonferrous metallic
type mineralizationʼs greater electrical activity
when wet. For example soils containing silver,
copper, or nickel oxides/nitrates react differently
in conditions from wet to dry. These soil traits
can occur naturally and are typical of areas with
mineral springs or volcanic origins. However,
be particularly aware of this wet/dry phenomena
in farming areas where the soil mineralization is
likely altered for agricultural purposes.
Chapter 5 DFX Pro Options
(Multi Frequency Method section)
30. 2 Frequency (Best Data)
Transmits and processes data continuously at both
3 kHz and 15 kHz frequencies (salt eliminated).
Automatically chooses to use only the data from the
most reliable frequency (based on both magnitude
and phase) for each specifi c target.
Gold, nickel, and other lower conductive metals respond
more reliably at higher frequencies. Copper,
silver, and other higher conducting alloys respond
more reliably at lower frequencies. 2 Frequency
(Best Data) uses the multi frequencymode to cancel
ground and salt and then selects the most ideal
frequency for that particular target alloy on a target
by target basis.
31. 2 Frequency (Correlate)
Transmits and processes data continuously at both
3 kHz and 15 kHz (salt eliminated). Compares
data at 3 kHz and 15 kHz. Target signals that do
not provide reasonably predictable information at
both 3 kHz and 15 kHz are automatically rejected.
Iron typically doesnʼt compare predictably between
frequencies and thus improved iron rejection can be
expected with the use of Correlate.
Differences in the target signal at 3 kHz and 15 kHz
are predictable regarding valued metal alloys such
as gold, copper silver, etc.. If the two signals do
not match within a reasonable range of predictability,
most likely the target is not a valued metal and
therefore is rejected.
49