Sealey FF400 Instructions Manual
INSTRUCTIONS FOR
OPEN AND SHORT DC CIRCUIT TESTER
MODEL NO: FF400
Thank you for purchasing a Sealey product. Manufactured to a high standard, this product will, if used according to these
instructions, and properly maintained, give you years of trouble free performance.
IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS & CAUTIONS. USE
THE PRODUCT CORRECTLY AND WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED. FAILURE TO DO SO MAY CAUSE DAMAGE AND/OR
PERSONAL INJURY AND WILL INVALIDATE THE WARRANTY. KEEP THESE INSTRUCTIONS SAFE FOR FUTURE USE.
1. SAFETY
1.1. GENERAL SAFETY INSTRUCTIONS
9 Familiarise yourself with the application and limitations of the tester as well as the potential hazards. IF IN ANY DOUBT CONSULT A
QUALIFIED ELECTRICIAN.
8 DO NOT apply voltage or current to the meter that exceeds the specified maximum.
9 Only for use with DC voltages.
8 DO NOT connect to a circuit exceeding 42V DC under any circumstances.
8 DO NOT use on AC voltages.
8 DO NOT use on any circuit directly or indirectly connected to AC lines or any other AC power source.
8 DO NOT use with any component or circuits of the ignition system.
9 Modernvehiclescontainextensiveelectronicsystems.YouarerequiredtocheckwiththevehicleManufacturer,foranyspecic
instructions regarding the use of this type of equipment on each vehicle.
No liability will be accepted for damage / injury, where this product is not used in accordance with all instructions.
9 When not in use, store the meter carefully in a safe, dry, childproof location. Storage temperature range -10°C to 50°C.
1.2. PERSONAL PRECAUTIONS
9 When using this tester, please observe all normal safety rules concerning:
9 Protection against the dangers of electronic current.
9 Protection of the meter against misuse.
8 DO NOT use leads if damaged or if the wire is bared in any way.
2. INTRODUCTION
Find short and open circuits fast and easily. Simply attach the sender unit to the circuit and follow the wires using the detector. Ideal for
automotive repairs. Suitable for all DC circuits up to 42V. Supplied in carry-case. Powered by two 9V batteries.
FF400 | Issue 2 10/04/17
Original Language Version
© Jack Sealey Limited
Refer to
instructions
Sender
Receiver
Rotary Switch
Selection Switch
3. OPERATION
3.1. How to use the probe (fig.1).
3.1.1.
The probe of the receiver is built of coiled steel and may be bent as needed in order to reach wires in congested areas.
Depending on the circuit characteristics and sensitivity settings the probe will pick up the the signal from the wire in a range of
positions. However, for the best possible range the reciever’s probe tip (black cap) should be positioned perpendicular (at 90°) to
the wire being traced and either above or below it.
3.2. Locating short circuit.
3.2.1. Connect the sender in series with the short-circuited wire, making sure one of the test leads is connected to the circuit’s positive supply
(or
connected to the negative for vehicles with positive supply connected to the chassis). A fuse socket (in the place of a blown
fuse), connector etc provides a convenient place.
3.2.2.
Set the switch of the sender to “Tone”, the red LED should light. If the red LED is dim or does not light, please check battery. Set the
rotary switch of the receiver to medium sensitivity position.
3.2.3. Move the probe along the wire, the receiver should give a tone.
3.2.4. Follow the wire or check it at different points, starting from the sender and moving towards the load. Audio signal (beeping sound)
indicates the integrity of the circuit. If the beeping stops it indicates that the probe has passed beyond the short circuit point.
3.2.5.
If it is difficult or impossible to get the receiver to pick up any signal, adjust the rotary switch of receiver and check again.
3.2.6. The short circuit is located in the area where the audio signal stops or changes significantly.
3.3.
Wire Tracing.
3.3.1. Wire tracing hook up and procedures are essentially the same as for locating short circuits. The sender sees the load (light, accessory
etc) as the short circuit or connection to ground. For wire tracing, simply follow the wire with positive (beeping) audio indicators feedback
on the tracer from the source load.
For step by step instructions please refer to 3.2 Locating Short Circuit.
3.4. Locating open circuit.
WARNING ! Observe the limits and safety precautions at all times.
3.4.1. Connect the Sender in series with the open-ended wire, making sure one of the units clips is connected to the circuit’s positive supply or
ground. A fuse socket (with fuse removed), connector etc provides a convenient place as shown in.
3.4.2. Make sure that the clips are firmly attached to their connection points, and set the switch of the Sender to “Tone”. In the case of having
connected the unit in any place other than the fuse socket, check that the circuit fuse is installed and in working condition (not open). If
necessary, replace with a new fuse of the same rating.
3.4.3. Switch Receiver on, and adjust the rotary switch for the correct sensitivity.
3.4.4. Slowly sweep the wire with the Receiver, ensuring that the probe is perpendicular and above or below the wire being traced and as close
as possible to it.
Fuse Socket
or Connector
Light Bulb Socket
or Connector
Fuse Socket
or Connector
Alternate hook-ups for locating open or short circuits and for tracing wires.
g.1
FF400 | Issue 2 10/04/17
Original Language Version
© Jack Sealey Limited
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