Emi (Electromagnetic Interference); Headphones; Operation And Controls; Disc Level - Teknetics Delta 4000 Owner's Manual

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OPERATION and CONTROLS (continued)
MENU SELECTIONS
cont.)
2. DISC. LEVEL
and
Use
to increase or decrease DISCRIMINATION level.
Each time you press
, a target category is eliminated from detection.
Elimination occurs from left to right. When a category description (for example
"IRON") disappears from the display, then targets classified in that category
will not be detected.
Pressing
reverses the discrimination process. With each press of
, a category description will reappear, indicating that targets
classified in that category will again be detected.
Discrimination is a cumulative elimination system. Targets can be eliminated
from left to right on the scale, with each additional press of
more objects being eliminated from detection.
3. NOTCH
Use
and
to notch target categories IN or OUT while the NOTCH
line is highlighted.
Whereas the discrimination feature eliminates all categories sequentially from
detection, the NOTCH control allows you to selectively include or exclude
target categories from detection.
With each press of
or
display screen. As you move the position of the notched category, you are
changing the detection status of the selected category.
• If a target category was previously eliminated (word not visible) then
notching that category will return it to detection.
• If a target category was previously retained (word is visible) then
notching that category will remove it from detection.
Only one target category at a time can be selected for notching. To notch multiple
categories in or out, wait for the icon to stop flashing and then press
again to select the next notch.
Each time you press
to select notch, followed by
program will begin by changing the status of the IRON segment.
12
, resulting in
, the notched category moves across the
, the notch
THE BASICS OF METAL DETECTING (continued)
The searchcoil produces a magnetic field and then detects changes in that

5. EMI (Electromagnetic Interference)

magnetic field caused by the presence of metal objects. This magnetic field
that the detector creates is also susceptible to the electromagnetic energy
produced by other electronic devices. Power lines, microwave ovens,
lighting fixtures, TVs, computers, motors, etc.... all produce EMI which can
interfere with the detector and cause it to beep when no metal is present,
and sometimes to beep erratically.
The SENSITIVITY control lets you reduce the strength of this magnetic field,
and therefore lessen its susceptibility to EMI. You may want to operate at
maximum strength, but the presence of EMI may make this impossible, so if
you experience erratic behavior or "false" signals, reduce the sensitivity.
HEADPHONE JACKS
The detector has a 1/4" headphone jack on the left side of the housing.
When the headphone jack is connected, speaker audio is disabled.
USING HEADPHONES
Using a detector with headphones facilitates detection of the weakest sig-
nals and also extends the battery life.
It also allows you to hear subtle changes in the sound more clearly, particular-
ly if searching in a noisy location. For safety reasons, do not use headphones
near traffic or where other dangers are present. This device is to be used with
interconnecting cables/headphone
cables shorter than three meters.
or
Headphone
Jack
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