• could indicate that the cable fault is not contacting Earth, such as cable in conduit or a fault inside of a splice. Go to our section on Using Continuity Tester for more options.

• may indicate faulty equipment. See the section below for Testing The Spitfire

Fading Signal:

• it is common for the meter deflection to weaken as you move away from the Spitfire transmitter. It is also common for the deflection to disappear when you are located halfway between the Spitfire transmitter and the fault. Continue working the probes forward along the circuit until the signal is regained.

• return to the starting point and begin again, only this time do not skip over any areas.

• connect the Spitfire to the other end of the isolated cable and work the probes from that direction.

No Change in Signal:

• If the detector does not indicate a change in direction, and the cable is fully isolated, it may become necessary to use other methods to locate the fault, including excavating test holes.

Faulty Equipment

     Fault locating equipment that is abused, damaged, or worn out will cause nothing but frustration and safety risks. Successful cable fault locating is dependent on reliable equipment that is maintained in the best condition.

Equipment Testing

     Most basic equipment tests can be performed by anyone and can be performed in the field.

Detector (meter) Test:

• With no probes attached to the detector, press and hold the button on the detector while swinging the needle back and forth with the BALANCE adjustment.
• If the needle does not move, replace the battery inside of the detector. If the needle still does not move with a fresh battery installed the detector must be professionally serviced.
• If the needle only moves to one side, or hangs-up as it moves, the detector needs to be professionally serviced.

Spitfire Output Test:

• Using a good multimeter, connect the Black lead from the Spitfire to the Black multimeter lead, and the Red lead from the Spitfire to the Red multimeter lead. Adjust the multimeter for DC Volts and set it for the highest range.
• Plug in and turn on the Spitfire transmitter, and note the readings on the multimeter. The voltage readings will only be present when the Spitfire pulses, and will only remain for a brief time. The pulses should be between 500Vdc and 1000Vdc. If the readings are consistently below 500Vdc. the unit must be professionally serviced.

Lead and Probe Test:

• Disconnect and unplug the Spitfire transmitter.
• Attempt to stretch the Spitfire leads as well as the probe leads by grasping the leads in small sections and firmly pulling in opposite directions.
• The conductor in the leads will often break inside of the heavy insulation, if the insulation stretches easily during this test at any point it indicates a broken conductor.
• Temporary repairs can often be made in the field, but permanent repairs or replacement is highly recommended.

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