Detech EDS REACHER, Instruction Manual

FALSE SIGNALS AND SOLUTIONS 

8

A false signal occurs when something sounds like a good target, but it is not. 
These signals are produced by undesirable or discriminated targets like large 
pieces of iron, hot rocks or by electrical pulse-type electromagnetic 
interference. Your EDS  REACHER

 has a very good discrimination, but 

some bad “targets” with similar electrical characteristics could fool it. Some 
items very close to the searchcoil could sound good, as well as large pieces 
of trash. 

Е

xperience is the best teacher. With more practice with your EDS 

REACHER you’ll soon learn how to distinguish the false signals. At first, 
when you get a good response you’ll find that crossing over the target once 
or twice more the signal would break up or completely disappear.
The sources of false signals could be:
- 

Electrical interference

, caused by high voltage power lines, TV and radio 

towers, electricity transformers, cells of mobile phone operators or other 
detectors. Move farther away from the source, lower the sensitivity level. The 
use of a smaller sized coil is also a good solution.
- 

Highly mineralized soils

 (with high iron or salt content). In such conditions 

reduce the sensitivity, increase the level of discrimination. The smaller coils 
are possible solution.
- 

Extremely trashy areas

 may cause a lot of “chatter”. Increase the 

discrimination level or reduce the sensitivity, In some trashy areas the smaller 
sized coil would be beneficial for target separation.
- 

Metal Interference.

 The EDS REACHER picks up metals beneath the 

searchcoil, and if the metal objects are big - on the side of the search coil too. 
. Be careful that your digging tool and metals in shoes are not near your coil, 
and your coil cable isn’t hanging loose above the coil. Pay attention to be 
away from railings, ferro-concrete poles, etc.