Static All Metal Mode. Fisher Research Labs F75 SPECIAL EDITION

F75-MANUAL(122811).qx 12/14/12 9:04 AM Page 18

F75

Comprehensive Operating Manual & Guide to Metal Detecting

Static All Metal Mode

This mode is useful for finding large, deep objects, i.e. larger than a coin and deeper than 12 inches (30cm). STATIC functions similar to PinPoint but occupies a different position on the user interface. The audio signal gets stronger as the searchcoil approaches the ground. Unlike the other modes, the detection sound will not disappear if you stop moving the searchcoil.

The four adjustments are performed the same as with MOTION All Metal Mode, as described on the preceding page.

THRESHOLD

The audio threshold in the STATIC mode is internally fixed and cannot be adjusted by the user.

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Retuning: The audio threshold will slowly drift when searching in this mode. If you move quickly between temperature environments, such as from shade to sun, audio threshold may drift more rapidly until the searchcoil temperature stabilizes. When the audio threshold drifts in this fashion, pull the trigger back momentarily to retune the detector.

You will need to retune periodically when searching in this mode.

AUDIO PITCH

Works the same as in MOTION mode; see previous page.

SENSITIVITY

Set the sensitivity high enough too hear some random background noise and/or a slight amount of ground response. If you do not hear these noises, you will sacrifice detection depth.

If the background chatter is too annoying, or the ground noise is so high that it impedes operation, reduce sensitivity. Such a downward adjustment in sensitivity improves depth detection as you can now hear weak signals better.

The sensitivity system has two stages, 1-29 (low gain), and 30-99 (high gain). As you lower sensitivity and cross the transition from 30 to 29 in STATIC mode, it may be necessary to retune by pulling the trigger switch momentarily. You may need to adjust to a setting of 29 or less to silence electrical interference, or to prevent overload on highly mineralized ground or in salt water. You may also notice a shift in the ground balance setting over difficult ground conditions as you cross this transition.

GROUND BALANCE

Always perform the ground balance procedure before searching in STAT mode, using the trigger or with the manual adjustment.

If you do not ground balance before searching in STAT mode, most ground will produce an audible tone as you lower the searchcoil; the ground will “sound off.” Some soils will not sound off, but will remain quiet with a loss of sensitivity.

DEPTH DISPLAY

To see a target’s depth, in inches, pull the toggle switch.

TARGET ID

Move coil back-and-forth over target to see visual target ID.

F75

Comprehensive Operating Manual & Guide to Metal Detecting

Frequency Shifting

One disadvantage of a highly sensitive metal detector is its susceptibility to electrical interference from other electronic devices. If the detector chatters while the searchcoil is not in motion, the cause is either electrical interference or internal circuit noise due to a high sensitivity setting. If the detector chatters or emits intermittent false signals in the field, you are also probably experiencing electrical interference. If you suspect electrical interference, you may change the F75’s operating frequency. This is a trial and error method to try to find a frequency different from the suspected source.

To shift frequencies:

1. Hold the MENU button down. Do not release the button.

2. Push the trigger forward

OR pull the trigger back to change the frequency.

Each frequency change requires a push of the MENU button.

Each actuation will shift the frequency by one value.

The LCD will display the frequency, from F1 to F4. F1 is the lowest frequency. And the default frequency. The F75 does not retain changes in the frequency setting, when powered off.

See the Search Techniques section of this manual for more information on electrical interference.

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