General Technologies FF310 Fault Finder for Electrical Wiring Open / Short Circuit - Manual (Page 7)

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13.3 Circuits with multiple loads or branches
• When tracing circuits connected to, or which are powering multiple loads and/or
branches (See Fig. 10), and when these circuits are active or live, the bulk of the
current injected into the circuit by the FF310T will be directed to the shorted branch
of the circuit. However smaller amounts of current (or stray currents) will flow to the
other branches as long as these provide a path to ground (i.e. close the circuit).
•
These stray currents present in the non-shorted branches of the circuit, and
depending on the circuit configuration and physical layout of the wires, could be
picked up by the FF310R (receiver), making the tracing procedures confusing, and
even misleading.
• The simplest and most effective way to deal with these cases, is to disconnect or
remove all the loads from the circuit being traced (i.e. removing light bulbs in
example shown in Fig. 10).
14 - Technical specifications
FF310T Transmitter
Voltage range: 6 to 42 Volts DC.
Indicator: Green LED indicator for Power On or Open Circuits.
Red Led LED indicator for short circuits.
Power source: 9 Volt alkaline battery, Duracell MN1604 or equivalent.
Connector: Two 5 Amp. universal micro-clips with auto polarity
and 18” long cable.
Battery life: Approximately 25 hours of use.
FF310R Tracer
Tracer Sensitivity: 3 User selectable levels (Low, Medium and High)
Tracer probe: Flexible 8” gooseneck insulated steel probe.
Indicator: Green LED indicator for Power On and Open Circuits.
Red LED indicator for short circuits.
Audio signal for shorts and opens.
Variable flashing and modulated audible signal.
Power source: 9 Volt alkaline battery. Duracell MN1604 or equivalent.
Battery life: Approximately 25 hours of use.
Fig. 10 - Schematic of a single circuit with multiples loads