Solution: To overcome this move out from under the line parallel or adjacent until a signal is heard and repeat procedures 1 to 16.
Electric fields from power lines can be disturbed and redirected by objects that are grounded. A tree near a power line will lower the strength of an electric field which causes you to change the setting on your tester. Other influences such as weather, water (humidity) will change the electric field strength.
Solution: By moving around the pole at a distance of 10 metres a clear and free signal can be gained.
The Modiewark tester is not designed to operate where mains cable are armoured, enclosed in metal conduit, underground or any situation where the AC field is negated by metal shielding.
The unit will not detect DC voltages and must be used by trained personnel around train tracks and railway control boxes and signals.