Справочник Пользователя для Charles Machine Works Inc The CMW-300ST

Distortions in the electromagnetic field around a line can affect 
location and depth accuracy. Tees, bends, parallel lines, crossing 
lines, or large metallic objects can distort signals.

NOTICE: If target depth and location are critical, confirm by hand-
digging or vacuum excavation.

Learn to recognize the following kinds of distortion:

Shadows, also called blind spots, often happen when a metallic 
object partially obstructs signal, or a signal from a parallel line 
interferes with target signal.

False signals describe situations where the receiver indicates a 
line location where there is no line. False signals often happen 
when a line tees or bends, runs parallel to the target line, or 
crosses the target line.

IMPORTANT: Generally, the receiver shows less distortion in peak 
antenna configuration.

Distortions in the electromagnetic field around a line can affect 
location and depth accuracy. Tees, bends, parallel lines, crossing 
lines, or large metallic objects can distort signals.

NOTICE: If target depth and location are critical, confirm by hand-
digging or vacuum excavation.

Learn to recognize the following kinds of distortion:

Shadows, also called blind spots, often happen when a metallic 
object partially obstructs signal, or a signal from a parallel line 
interferes with target signal.

False signals describe situations where the receiver indicates a 
line location where there is no line. False signals often happen 
when a line tees or bends, runs parallel to the target line, or 
crosses the target line.

IMPORTANT: Generally, the receiver shows less distortion in peak 
antenna configuration.