Weighted Peak Method (available for probes WP400,
WP400-3 or WP10M)
In the area of low frequencies considered here, which affects a wide variety
of industrial processes, it is normal to find complex non-sinusoidal signals
that are difficult to measure.
The Weighted Peak Method (WPM) is the most appropriate method to obtain
the best results. There are other methods, such as the multifrequency fields
summation method, which may give gross overestimates, since they fail to
take signal phase into account.
WPM performs inverse digital filtering, using a function that is the complement
or inverse of the reference limits curve that we wish to use (selectable).
This gives a result directly as a percentage (%) of the limits for which we
are measuring exposure.
The SMP3 offers an extensive list of limits corresponding to the different
standards or laws of different countries. You can use WPM for any existing limits.
Weighted measurements using WPM can be taken with any of the three
measurement methods mentioned above. All you need to do is select the
reference limit from the list of available limits, then take the measurement
as indicated for each method. To choose a limit, select “LIMIT” on the
dynamic menu, as shown in the figure screenshot 4A.
The figure screenshot 4B below shows the weighted result for the
broadband electric field in respect of the “Low AL” limits of Directive
2013/35/EU.
With the limit chosen, you can assess the EMF by ensuring that both, the
peak and the RMS value, are below 100%. Please note that the RMS value,
given by the SMP3, is already divided by Square root of 2 for a direct reading
to comply with the limits.
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