Fluke PRO3000 User Manual page 13

SmartTone Positive Identification
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Figure 4. Tracing Pairs
The SmartTone function is available when the toner is in alternating
tone mode. SmartTone is intended for use on dry pairs of wires that
are un-terminated at both ends of the run. It is not intended to work
on wires connected to DC power sources (e.g.,live telephone lines),
nor will it work on wire pairs that are carrying AC signals (other than
the toner's AC signal).
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