Fisher Labs F 75 User Manual page 22

F75
Comprehensive Operating Manual & Guide to Metal Detecting
Discrimination Mode (continued)
FOUR DIFFERENT AUDIO TONES This selection is similar to 3, but with a fourth medium-
4:
high tone for targets in the numeric range of 53 to 65. This four-tone system is useful for
searching in areas where there may be very old coins which register in this range.
dP: DELTA PITCH This setting produces a tone whose pitch varies in relation to the visual ID
number -- the higher the ID, the higher the pitch. Good for relic hunting. This setting is
also useful in areas with a high concentration of steel bottle caps. Coins will produce a
fairly constant pitch as you sweep back and forth. Bottle caps produce inconsistent
tones, often with a squawk at the beginning of the sound.
Process Number (Process #)
This menu selection offers the user a choice among several different methods of audio
discrimination to accommodate a variety of search conditions and personal preferences.
These methods differ in the way the signals are processed for analysis.
The Process Number selections are:
dE: DEFAULT PROCESS
This is the best process to use for most conditions, and is thus the default.
JE: JEWELRY PROCESS
Detector will be more sensitive to small and low-conductivity metals like jewelry, but will
run noisier in trashy areas.
bc: BOTTLE CAP MODE
Response is modified so that steel bottle caps will usually produce inconsistent, or non-
repeatable, tones and broken sounds. There may be a slight reduction in the ability to
separate adjacent targets. Use this process in areas with a high concentration of steel
bottle caps. Also refer to the Capabilities & Limitations section for sweep techniques to
aid in the identification of steel bottle caps
PF: for use in plowed fields.
Some users may prefer this process for hunting in irregular ground, especially plowed
fields.
WHAT YOU SEE VS. WHAT YOU HEAR
The visual target ID displayed on the LCD is based entirely on sampled processing; the
number displayed represents a snapshot of the target's identification as the searchcoil passes
over the object. When using these different processes, or methods, the detector's audible
response may differ from the visual. When using the different processes, there is not a 100%
correspondence between what you see and what you hear, especially on buried targets where
ground minerals influence target ID and audible response. By making the audio and visual
systems independent, the F75 allows each system to do what it does best. The audio is
optimized for quick response and target feel, whereas the visual system provides the best
numeric resolution of target ID.
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