6.4 WPM display mode (Weighted Peak method)
Narda NBM-550 69
6.4 WPM display mode (Weighted Peak
method)
Information about WPM
Fields with complex signal characteristics, such as those
caused by the current pulses used in resistance welding,
are becoming more and more common. The Weighted Peak
method gives the correct measurement value for this kind of
pulsed signal and takes the phase of the frequency
components into account at the same time. This makes
measurement much easier, since you only have to select
the relevant safety standard. The device then supplies the
measured value as a percentage of the limit value.
The EHP-50F performs the Weighted Peak method with
mathematical convolution in the time domain to conform
with ICNIRP 2010 and IEC 61786-2. The measurement
covers the entire frequency range from 1 Hz to 400 kHz. A
graph shows the time characteristic of the measured value.
The EHP-50F supports exposure level evaluation according
to:
• ICNIRP 1998, public
• ICNIRP 1998, occupational
• ICNIRP 2010, public
• ICNIRP 2010, occupational
• Directive 2013/35/EU, Limbs Action Levels
• Directive 2013/35/EU, High Action Levels
• Directive 2013/35/EU, Low Action Levels
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