User’s Handbook FF300 Electrical Circuits Fault Finder
Table of contents.
4 - Setting the sensitivity level 5 - How to use the probe: The FF300R has three user selectable sensitivity ranges: ‘Low’, ‘Medium’ and ‘High’. These ranges allow the technician to choose the degree of sensitivity most suitable to the particular detection being performed. 4.1 Procedure to select the FF300R’s range : The probe of the FF300R is built of coiled steel and can be bend as needed, in order to reach wires in congested or difficult areas.
6.10 The short circuit is located in the area where the audio/visual signal stops or changes significantly. 6.11 When the test is completed, switch off the transmitter unit pressing the On/Off button and disconnect from circuit. Note: The closer the tracer probe is to the wire carrying the signal, the faster the beeping and the flashing will be. Some times it will prove advantegous to reduce the sensitivity level to pintpoint more accuratelly the faulty area.
• For identifying wires without load connected: Connect transmitter as described in section ‘9- Locating Open Circuits’,to the circuit to be identified. Then proceed to scan all suspected wiring with the FF300R’s probe until the flashing and beeping is at its maximum. In the case of tightly packed wires( bundles, conduits, etc.), it may be necessary to spread these apart to facilitate the identification process of a particular wire.
Because the probe may be picking up the signal from the other nearby branch (the one with the wire actually being traced). To avoid following the wrong path, the branches should be swept maintaining the probe outside the apex area between the split, as shown in figure 8 below. Fig. 7 - Detection field when tracing short-circuits with the FF300 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 FF300’s.
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 metod should be used only as “last resource” and with the FF300R set to low sensitivity, as it may make the pinpoint of the precise location more difficult due to the much increased range.
15 - Care of the Unit The FaultFinder is a precision instrument and should be treated as such. Damage caused by mistreatment is not covered by the warranty. Keep the units in their carrying case when not in use and do not subject to dampness or severe heat or cold. Do not use the units in the rain, if they should accidentally get wet. Dry off with a clean paper towel before storing away. Protect the units from contact with any solvents.
Part # FF300M9909EN © 1999 General Technologies Corp.
