4.2.2 STEP 2 Ground Balance
Ensure this procedure is carried out on ground free of metal and hold
the coil about 150 mm (6 ins) above the ground.
a. Press and release the Ground Balance button. Slowly lower the
coil directly to the ground then lift the coil up again 150 mm
(6 ins). Refer to Figure 15.
b. Continue to slowly lower and raise the coil until the ‘Ground
Balance OK’ tone is heard. (‘Ground Balance OK’ tone consists
of a three-tone sequence which occurs after approximately 7
seconds.)
150mm
(6 in)
Figure 15: Ground Balance procedure
4.2.3 STEP 3 Test Piece
Ensure the operator’s hands and arms are free of metallic objects
(watches, rings etc.), and that no other metallic objects are near the coil.
a. Remove the Test Piece from its stowed position on the Armrest
by extending the Armrest and rotating the Test Piece clockwise.
Hold the Test Piece above the middle of the coil with the end
containing metal AWAY from the coil.
b. Move the Test Piece towards the centre of the coil until it lightly
touches the surface then move it away in the same direction.
NOTE
The detector should always be set to position 4 and in Detection
Mode when conducting STEP 3.
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