General Technologies FF300 Fault Finder for Electrical Wiring Open / Short Circuit - Manual (Page 3)

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4 - Setting the sensitivity level
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 :
1. Unit should be on, if not, turn it on by momentarily pressing the “ON/OFF” button.
2. Press and Hold “ON/OFF” button for approximately 3 seconds until a beeping
and flashing following the pattern below indicates that the desired sensitivity level
is set:
I- Low Sensitivity: single (1) flash and beep.
II- Medium Sensitivity : double (2) flash and beep.
III- High Sensitivity : Tripple (3) flash and beep.
The sensitivity level is selected in the following it sequence:
LOW MEDIUM HIGH
Sensitivity Adjustment Sequence
For example: If the FF300R unit is set to HIGH, in order to set the sensitivity to
LOW follow the steps described in 1. and 2. of this section (above).
4.2 Checking the current sensitivity setting:
The FF300R’s current sensitivity setting is displayed when the unit is in stand-by mode (unit
on, with no audible signal). The high sensitivity setting generates a quick tripple flashing
of the green LED, a double flashing in the medium sensitivity range and a single flashing
indicates a low sensitivity level setting..
Standby green LED flashing pattern:
Green LED shows a: FF300R Tracer set to:
Single (1) flash Low sensitivity
Double (2) flash Medium sensitivity
Tripple (3) flash High sensitivity
When turned off, the FF300R will retain the last selected sensitivity setting.
5 - How to use the probe:
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. Depending on the circuit characteristics and
sensitivity setting, the probe will pick-up the signal from the wire in a wide range of posi-
tions . However for the best possible range the FF300R’s probe tip (yellow cap) should
be positioned perpendicular ( at 90°) to the wire being traced and either above or below
it, as shown in Fig. 1 below.
Fig. 1 - Probe positioning
6 - Locating Short Circuits
Refer to the Hook Up Reference Chart in Pag. 6.
6.1 Observe the limits and safety precautions at all times (refer to the begining of this
handbook).
6.2 Connect the FF300T (transmitter) in series with the short-circuited wire, making sure
one of the unit’s clips is connected to the circuit’s positive supply (or vice versa for
vehicles with positive supply connected to chassis). A fuse socket (in place of the
blown fuse), connector, etc. provides a convenient place as shown in Fig.2 and Fig.3
in page 7.
6.3 Switch the transmitter on by pressing the On/Off button and observe if the Red LED
on the FF300T is lighted up. If not check connections, power supply, and in the case
of having connected the unit to any place other than the fuse socket, check that the
circuit’s fuse is installed and in working condition (not open). If necessary replace
with a new fuse with the same ratings.
6.4 Switch the FF300R (tracer) on, and check if green LED starts flashing.
6.5 Verify that the FF300R is set to the low sensitivity level (single green LED Flash).
6.6 Slowly sweep the wire, conduit, etc., with tracer, ensuring the tracer’s probe is per-
pendicular and above or below the wire being traced and as close as possible to it
.
6.7 Follow the wire or check it at different points, starting from the transmitter and moving
towards the load (accessory, light , etc.) observing the positioning of the probe as
indicated above. Continue this procedure while the audio signal (beeping sound) and
visual signal (flashing Red LED light) indicates the integrity of the circuit. If beeping
and flashing slows or stops it indicates that the probe is either moving away from the
faulty wire or it has passed beyond the short circuit point.
6.8 If difficult or impossible to get the FF300R Tracer to pick-up any signal, then adjust
the sensitivity to HIGH, and check again if a signal is received.
6.9 Double check positioning the probe before and after the suspected place. If the short
circuit point has been found, the audio/visual indicators will show circuit integrity on
for one position, but not for the other.