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3.2 Measurement functions
(-20db) Measuring range for background noise
Increases the sensitivity of the device. Uses to
detect stray magnetic fields. This function is
used to determine crosstalk of the loops.
Measurement range from -43 to -12 dB.
(0 dB) Measuring range for magnetic field
strength
Broadband measurement range to control the
field strength that the induction loop emits.
Filter A
Evaluates the values measured on the basis of
the listening cuive of human ears.
Filter Norm
Evaluates all the values measured in the same
way on the basis of their physical values.
3.3 Using the meter
Before starting any calibration, be sure to
determine a reference point in the loop (usually
in the middle of the magnetic loop being
placed).
Keep the OP-FSM upright throughout the
operation.
Respect also the distance between the ground
and the meter, it will depend on the application
of the loop. The meter should be held at head
height (where the future user's hearing
instrument will be).
For example, for standing use, hold the meter at
approximately
1m70.
For
seated
use,
approximately 1m20.
Manuel d'utilisation - User Manual
19
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