Product Manual

Magna-Trak 200 Series Magnetic Locator • 7
4.4 LCD Visual Display
Several visual display functions, provided for ease of operation, are defined below:
Digital Signal Indicator
A two digit numeric display shows the signal level as related to the audio ≠signal
response being heard from the speaker. At the lowest signal level, when no ferrous
metal is present, a small number will be viewed (between “0” and”“5”). As metal is
approached, the numbers will increase, reaching “99” at its maximum peak. Deeply
buried objects or lower sensitivity”≠levels will yield a lower peak number to aid in
≠pinpointing the object. A “+” in front of the two-digit numeric display indicates
north polarity field detected from object. A “-” in front of the two-digit numeric
display indicates south polarity field detected from object.
Analog Bar-Graph Signal Indicator
The bar graph ≠display expands outward from the center “oval” as related to the
audio”≠signal response being heard from the speaker. The signal level bar graph
expanding right indicates north polarity field detected from object. The signal level
bar graph expanding left indicates south polarity field detected from object.
Power Line Indicator Feature
The electromagnetic fields radiated from buried
or overhead power lines are picked up by the
sensitive electronic circuitry and internally
transformed into a visually flashing indicator in
the display window as shown.(Fig. 2).
The distance or detection range from the cables
where the locator responds depends on the
energy being carried by the electrical conductors.
The higher the energy, the greater the distance
the locator will respond to it. If the cables are
dead (no electrical connection or energy
transfer), then no visual indication will appear.
When the locator is turned ON, this feature is
activated immediately. This feature only responds
to 50 or 60Hz power line frequencies and not to
telephone or TV cables. This feature is intended as
an aid only and not to be used for locating or
pinpointing electrical cables.
The magnetic detection operation and
performance of the magnetic locator are
completely independent from the power line
indicator feature.
4.5 Erase Button
This is an optional button that is primarily used in locations where large metal objects
normally interfere with the desired operation of magnetic locators. Cyclone fences,
metal buildings, vehicles and other large magnetic objects can be electronically
erased with this button.
The operation of this feature is best defined by explaining the typical locator without
this feature. For example, typical magnetic locators will normally yield a screaming
audio tone when they are being operated in close proximity to a metal fence. The
magnetic field from this fence will usually override the signal being sought from the
Fig. 2