Description 4-23
4.10 Weighted Peak
Function
(Time Domain)
The EHP-50F Weighted Peak (Time Domain) option performs test in the
range 1 Hz to 400 kHz to comply with the informative annex of the ICNIRP
Guidelines 2010 (appendix “Determination of the weighted peak
exposure”) for coherent signal source.
The current legislation proposes limits for electromagnetic fields, the value
of which depends on the frequency.
When exposed to a sinusoidal field, it is relatively simple to relate the
measurement of the field to the reference limit, as the frequency is known
or easily measurable.
In case of multi-frequency fields, pulsed, non-sinusoidal waveforms, the
exposure assessment in relation to the limit becomes more complex.
In these cases, typical of industrial environments, it is not possible to relate
the amplitude of the field to the limit value at a specific frequency, as the
spectral content of the signal can be very complex (many frequencies are
present at the same time).
The ICNIRP guidelines propose a method for the evaluation of multi-
frequency fields, that consists of the sum of the field strength of the
individual spectral components related to the limit corresponding to the
frequency of each individual component. This method is appropriate in the
presence of incoherent components.
4.10.1 Weighted Peak
requirements
The Weighted Peak function needs the following in the list order:
- In the Mode Section, select the Function “Weighted Peak (Time Domain)”
- In the Standard section set one of the available standards, such as, for
example, the ICNIRP 2010 limits for occupational or general public
exposure.
- In the Mode section select one of the ranges among the Electric 1 kV/m,
Electric 100 kV/m, Magnetic 100uT or Magnetic 10mT.
- In the Data section, enter the desired Hold Time.
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