Fisher M-SCOPE 1270 - Manual (Page 15)

A “False Signal” occurs when something sounds like a good target,
but is not. Your 1270 does a great job of discriminating, but bad
“targets” with similar electrical characteristics can fool it. Large
pieces of trash or items very close to the search coil will
occasionally sound “good”. Experience is the best teacher. As
you accumulate more hours with your 1270, you will soon learn
how to distinguish “false signals”. Initially when you pass over a
target, and get a good response, you will find that crossing over
the target once or twice more, the signal will break up or
completely disappear.
Here are some sources of false signals and the solution.
1. Electrical Interference: Caused by radio and TV towers, power lines, or
other metal detectors.
SOLUTION: Move farther away from the source, slow down the sweep speed,
or lower the sensitivity.
2. Highly Mineralized Soil: Soils with a high iron or salt content.
SOLUTION: Reduce the sensitivity, raise the discrimination level, or if
searching in the ALL-METAL GROUND ADJUST mode, readjust the
ground adjust setting.
3. Extremely Trashy Areas: May result in a lot of “chatter”.
SOLUTION: Utilize the SILENCER mode, adjust the discrimination level
(the use of the IRON DISC mode can be very helpful here), or reduce the
sensitivity. In some areas, a smaller coil will be beneficial to better achieve
target seperation.
4. Metal Interference: The 1270 will pick up metal ABOVE and on the
SIDE of the coil, as well as under. WATCH FOR: Large metal structures,
your digging tool, and your coil cable hanging loose above the coil.
Your 1270 comes equipped with two 9-volt standard transistor radio bat-
teries. Should your low battery indicator LED start to blink, replacement
in approximately one hour will be necessary. Locate the two battery com-
partments on the underside of the CONTROL HOUSING. Gently push the
clip on the front end IN and UP. Pull the nylon tab to remove the batteries.
Make note of the polarity (+ / -) of your new batteries. The (+) or Positive
side is the smaller of the two contacts on the battery. Match that with the
(+) inside the 1270 battery compartment. Slide the top of the battery in
pushing against the copper contacts. Gently push the bottom of the battery
into the compartment. Replace the Battery Cover.
13
BATTERY REPLACEMENT
FALSE SIGNALS