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3.2 Measurement functions
(-20db) Measuring range for background noise
Increases the sensitivity of the device. Used to
detect stray magnetic fields or a magnetic
pollution zone. We advise to carry out your
measurements with a maximum of devices in
operation
(neon,
sound
electrical rooms and transformers, etc) to
reproduce as well as possible a normal use of
the equipped place and to evaluate in real
condition the zones likely to be polluted .
This feature also allows you to determine the
crosstalk of loops to test their privacy.
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 curve of human ears.
Filter Norm
Evaluates all the values measured in the same
way on the basis of their physical units.
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). Then we advise you to determine a
minimum of 6 measurement points.
The OP-FSM incorporates a receiver coil placed
vertically in the unit, so it is important to
maintain the unit upright throughout the
operation.
Manuel d'utilisation - User Manual
All manuals and user guides at all-guides.com
sources,
screen,
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.
We advise you to note all your measurement
statements on a document and return it to
the establishment manager (end customer).
This statement will certify that the installation
complies with the restrictions of IEC-60118-4
(if measurements and settings are good).
Opus Technologies has created a compliance
report to gather all your measurements, you
can download the model on the OP-FSM
product page:
http://opus-technologies.fr/products/loop-
amplifiers/op-fsm/
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