Depth Measurement 45º Method; Tilted Magnetic Field Identification - SubSurface Instruments PL-TT Series User Manual

Move to the location you want to measure depth. Stay at least 15 feet away from the
Move the r
1. Mark the path on the ground as precisely as possible using the Null method.
2. Place the r
lines on the lower tube are straight up and down orienting the unit at a 45º
3. Pull the r
4. When the
5. The distance between the r
depth reading may be caused by nearby buried metallic objects, such as a second cable, pipe,
sewer, fence or railroad track or from the signal conducting on multiple lines.
6. Confirm the depth measurement by repeating the above steps on the opposite side of the pipe or
cable.
7. A variance greater than 5 inches in depth measurement may indicate interference from adjacent
cables, pipes or other objects.
When adjacent cables or pipes are present, they will sometimes create locating errors. Some of the
t
ransmItter
with the original signal. The result is a Tilted Magnetic Field. This is often the reason that numeric
depth readouts are sometimes created in error.
The operator can verify the accuracy of path locate by performing the 45º Angle Method locate on
both sides of the cable path. If the right and left side depth readings agree to within 5 inches, the
path locate is accurate. If the two depth readings do not agree, then dig with care. A closer locate
would be halfway between the two outside depth locate marks.
This is an important technique that should be used to ensure the most accurate location possible.
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d m
epth easurement
left to right across the path until the cable is located.
eceIver
on the ground with the LCD meter facing up. Position the unit so that the
eceIver
away from the cable path (at 90º to the cable path) keeping the unit at 45º.
eceIver
r
indicates a Null reading, mark the location of the
eceIver
Signal Null Point
Ground
Buried cable or pipe
t m
ilted agnetiC
signal is picked up by the adjacent conductors and is redirected so that it combines
45º a m
ngle ethod
and the cable path is the depth of the pipe or cable. A false
eceIver
Depth
(End view)
f i
ield dentifiCation
angle.
r
eceIver
45° Signal Null Point
45°
Ground
t .
ransmItter
sight
's foot.
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