Audio
The audio feature allows amplitude changes in the
incoming signals to be heard as audio, which can
help in determining the type and source of RF.
Many common EMF sources produce a distinct set of
sounds via the Acoustimeter, and so with a little
practice, you can soon learn to identify a source type
via audio. Some sound samples to help you identify
different signals are available on:
http://www.emfields-solutions.com/rf
Most modern digital EMF sources are “pulsed”,
meaning they have an amplitude-modulated signal.
However, some sources are not amplitude
modulated, including analogue sources, and these
will not produce much sound even with the volume
turned up. We explain more about this in the “Digital
and Analogue signals” section.
It is sometimes possible to hear voices and music
when close to powerful broadcast AM radio
transmitters. These are outside of the normal RF
frequency detection range of the meter, but they are
sufficiently powerful transmitters to be picked up.
When no LEDs are illuminated any regular very quiet
sounds should generally be ignored as they are due
to the internal functioning of the meter. However,
incoming pulsing RF signals can still
often be heard when the LCD is displaying readings
of <0.02 V/m and < 1 µW/m
2
.
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