VESALA TraceMeter TM30, Руководство пользователя

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13 TM30 User Manual v. X1.0
7. Practical usage examples
In this paragraph there are two symbols used to describe grounding & earth connection:
This symbol means grounding through constructions, such as grounded pipes,
metal chassis, mains wall socket protective earth connector etc.
This symbol means direct earthing to soil with a ground pick or other similar
means so that no other constructions are involved.
7.1 Tracing wire pairs
7.1.1 Cross connection pairs
Task: Unused or active pair needs to be traced at cross connection
terminals.
-
Connect transmitter to the traced pair. Transmitter shows possible voltage and
frequency on pair.
-
Choose
Open wires
mode with receiver and move receiver nose close to the
wire bunch along the cross connection rack.
-
When the right terminal block is found, strongest signal can be heard above the
right pair when distance is <5cm.
-
If possible verify the result by short-circuiting the pair: signal should disappear.
Task: Unused (open) pair needs to be traced at cross connection racks
without knowing its route or ending area.
-
Short-circuit the traced pair wires at the starting point. Connect transmitter
between the shorted pair and grounded cross connection rack.
-
Choose
Near cable
mode with receiver. Scan the wire bunches on the rack
shelves with the receiver nose. Right bunch gives strongest signal.
-
Follow the right bunch to the correct terminal block or to the open wire ends.
Receiver gain often needs to be adjusted lower when the right pair gets closer.