3M 2273ME-iD, 2250ME Buried Cables And Pipes, Transmitter Connections, Direct Connect Method

Buried Cables And Pipes

Transmitter Connections

Perform a battery test. Use one of the following three methods to produce a trace signal on the target pipe or cable.

Direct Connect Method

Plug the direct connect cable into the output jack [T-6] of the transmitter. Connect the black clip to the ground rod. Place the ground rod in the earth perpendicular to the suspected cable/pipe path. If necessary, extend the black lead with the Ground Extension Cable (#9043 available separately).

1.Remove the ground bonding and attach the red clip to the shield of the cable, pipe, or target conductor. (If locating power cables, the red clip can be attached to the transformer cabinet, or the meter box).

2.Turn the transmitter on by pressing Ohms [T-2]. The continuity of the circuit will be measured. The results are displayed [T-4] in ohms and as a tone.

−−If the continuity of the circuit is very good (the reading on the display is less than 3K Ω. and a solid tone from the transmitter is heard) all frequencies can be used to locate. Always use the lowest frequency available. Lower frequencies are less likely to ‘bleed over’ to other cables in the same area, and are very good for tracing over long distances.

−−If the circuit reads more than 3K Ω., but less than lOK Ω (indicated by a beeping tone from the transmitter) it will be necessary to use a higher frequency than 512 Hz or 577 Hz in order to locate the cable/pipe.

−−If the circuit reads more than lOK Ω., it will be necessary to use an RF signal such as 33 KHz or 133 KHz.

−−If there is no tone and the transmitter indicates that there is an open circuit (OL in the display) this could be an indication of a poor ground, or an open-ended cable or pipe. Use one of the higher frequencies available, at high level. If it is an open-ended cable or pipe, the receiver's response will decrease suddenly at the site of the clear or severed end.

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