LaserLine CableTracer Pro Manual De Uso página 24

7B-2 Locate interrupted cables
!
– Make the measuring circuit zero-potential.
– An interrupted cable must have a transfer resistance of 100 kΩ or higher.
You may use two senders for this application. The second sender is not included in the set but is availa-
ble as an accessory. Set the different sender codes in the sender devices and connect the cable to be
measured and the protective earth. See image f in chapter 4. Then turn on the receiver and begin tracing
the course of the cable. The interruption in the cable is located exactly in the middle between the two
sender code values indicated in the LC display. Also follow tips 1 through 3.
Recommended setting for the receiver: Manual search mode, maximum sensitivitiy, see chapter 5C.
Tip 5: The cable interruption may be localised systematically by adjusting the sensitivity of the receiver and
the output power of the sender.
Tip 6: To achieve optimal results, any cables not included in measuring should be earthed. This is particularly
true for any unused individual conductors in multi-core cables and sheathed cables. If these are not
earthed, the fed in signal may lead to crosstalk (due to capacitive and inductive coupling). The cable inter-
ruption can then no longer be adequately localised.
Tip 7: The search for interrupted cables in heated floors follows a similar concept. Ensure that there is no
earthed shielding film above the heating wires. If necessary, separate it from the earthing connection.
24
GB
= =
When working with one sender, the exact location of the
g
interruption may not be as easy to find due to possible
crosstalk of the electromagnetic field. See image g. In this
case, the receiver displays the transmission signal after the
interruption as a significant decrease. The interruption is
located where the signal begins decreasing.
f