General-technologies FF310 Fault Finder for Electrical Wiring Open / Sh Manuel d'utilisateur télécharger pdf (Page 6)

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12.3

Some circuit characteristics that may affect the tracing of a wire:

• Electromagnetic loop size and geometry, etc. may affect the range of the FF310

Receiver. For example for circuits in which the live and ground (return) wire

run parallel and close to each other in the same circuit, the two magnetic elds

interaction may weaken the signal, thereby reducing the FF310 range.

• Wires enclosed or tightly lining the metal frame or body of the vehicle, (i.e.: door

frames), have the same effects as having the live and ground wires running in

parallel in the same circuit since, the metal frame or vehicle body will be acting

as a ground wire. Another unfavorable factor may be due to the channeling effect

steel parts have on magnetic elds. These two cases, individually or combined,

will reduce and sometimes impede the tracing of the wire sections affected.

Hint:

Whenever possible the short circuit mode of operation should be used, be-

cause it provides with the best tracing capabilities.

13 - Special Tracing procedures

• In all cases, rst set the FF310R at the lower sensitivity level and increase it as

necessary. Proceed as indicated in the sections of this User’s Manual applicable

to your situation.

• Always after locating a probable fault area, verify several points in the wires on both

sides (before and after) the suspected area. The signal should be present at only

one side of the fault (open or short). This procedure will help avoid confusing a signal

loss with the actual trouble point.

Fig. 8 - Tracing Wires inside bundles and conduits

Fig. 9 - Simplified dome light circuit hook up for wire tracing

• When tracing or identifying wires connected to lightly loaded circuit (low

currents), this reduces the range of pick up signicantly. A possible solution is after

connecting the FF310T - transmitter in series with the circuit to trace, is to replace

the load (light bulb, module, etc.) with a direct connection to ground. This allows

the FF310T to inject a more powerful signal easier to detect.

• For the cases in which it is suspected the layout of the wires is the cause of a very

difficult to pick up or weak signal, a dramatic increase of the range can be

accomplished by “spreading” the circuit.

• This is achieved by means of connecting a jumper wire between the live wire

(preferably at a termination point in the circuit such as a light bulb socket or a switch,

etc.), and a ground point somewhere else in the vehicle ( see Fig. 9). This last method

should be used only as “last resource” and with the FF310R set to low sensitivity,

as it may make the pinpoint of the precise location more difcult due to the much

increased range.

• Always verify that the FF310T is connected in series with the circuit being tested and

that its red indicator light is on, as this conrms a proper connection and will limit the

amount of current owing in the circuit.

Fig. 7 - Detection eld when tracing short-circuits with the FF310

13.1

Wire bundles and conduits:

• Special care should be given in the case of tracing a wire inside a bundle or

conduit when there is a split. In this case it may be possible to follow the wrong branch

for a short distance and still receive a positive audio/visual indication.

• To avoid following the wrong path, which could happen if the probe picks up the

signal from the other nearby branch of the circuit, the branches should be swept

maintaining the probe outside the apex area between the split, as shown in Fig. 8.

• Careful attention should be paid to the beeping and ashing speed of the tracer unit

indicators, as these provide the necessary feedback to evaluate the proximity of the

probe to the wire being traced.

13.2 How to increase the pick up range when tracing wires

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General-technologies FF310 Fault Finder for Electrical Wiring Open / Sh Manuel d'utilisateur Page 6

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