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3M Dynatel 7550 Series User Manual

3M Dynatel 7550 Series
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78-9000-5020-0 Rev C 25
3. Induction Method
If you cannot make a direct connection, or use the 3M™ Dyna-Coupler clamp to apply a
locating signal on the target, use the induction method. When nothing is plugged into the
Output Jack [T-6] of the transmitter the unit will be placed into induction mode when it
is turned on. This method uses the internal coil of the transmitter to generate a magnetic
eld. This is the least preferred method of applying a signal on a target conductor because
it can easily be picked up by other non-target conductors in the area. However, it is the
preferred method of applying a signal to multiple cables/pipes in the same trench and for
the “two-person sweeping” application.
3M Dynatel™ Transmitters provide a choice of induction frequencies and output power
levels. Higher induction output power levels are needed for detecting deeper depths and
longer ranges. The 7500 Series transmitters provide four induction frequencies:
7550/7573 8 kHz, 33 kHz, 82 kHz, 200 kHz
7550E/7573E (International) 8 kHz, 33 kHz, 82 kHz, 133 kHz
The induction frequencies have three output power settings up to 12W. The 82 kHz and
higher frequencies are commonly used for deeper cables/pipes and the lower frequencies
are used to give longer locate distances. The 8 kHz (low frequency) induction helps in
locating shallow facilities, such as risers.
The following sections review Non-sweeping and Sweeping (Area) methods used with
the Induction Mode. The Non-Sweeping method is utilized when a specic target
requires path tracing. The transmitter remains stationary in-line over the target and the
path is traced. The Sweeping method is utilized when a designated area needs to be swept
for non-specic targets, for example, all the buried pipes or conductors in the designated
area. Several sweeping methods will be reviewed.
A. Non-Sweeping Induction Mode Locating
Position the transmitter over the target facility, with the hinge of the transmitter over
and in line with the cable/pipe path. Remove any cables from the Output Jack.
Align the Induction Direction arrows on the transmitter with the target conductor.
Turn on the transmitter, select the frequency and select high output or maximum
output power level for best signal-to-noise ratio.
Trace the signal path with the receiver using the Induction Peak (Ind Pk) mode.
The Induction Peak mode of the receiver is a mode in which the upper antenna of the
receiver is tuned to minimize distortion from the magnetic eld of the transmitter.

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3M Dynatel 7550 Series Specifications

General IconGeneral
Brand3M
ModelDynatel 7550 Series
CategoryMeasuring Instruments
LanguageEnglish

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