User Guide

51
Chapter 5 DFX
™
Pro Options
2 FREQ. (BEST DATA)
ON
OFF
TO TURN ON PRESS
ENTER
(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 specific target.
Gold, nickel, and other lower conductive metals
respond more reliably at higher frequencies. Cop-
per, 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 pro-
vide reasonably predictable information at both 3
kHz and 15 kHz are automatically rejected. Iron
typically doesn’t 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.
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 re-
maining three multifrequency options are auto-
matically "OFF". To turn BEST DATA "OFF",
requires the selection of one of the three remain-
ing 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 fre-
quency 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 first trust
the factory preset settings for the general types
of searching and then experiment to find 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) compo-
nents. 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 nonfer-
rous metallic type mineralization’s 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.
2 FREQ. (CORRELATE)
ON
OFF
TO TURN ON PRESS
ENTER
(Multi Frequency Method section)