Annex C: Instrument function ELT-400
C-2
Transfer function
The transfer function defines the intended frequency response of the
measuring instrument and includes the field probe measuring coils.
The transfer functions for the various operating modes differ significantly
from each other.
Detection mode / Detector
The ELT-400 simultaneously measures the RMS value and the peak value
of the magnetic field. Both values are available immediately after the
detection mode is switched. The measured values are continuously (every
250 ms) updated and displayed.
RMS value
The RMS value of the magnetic flux density is calculated from the RMS
values for each of the three measurement axes, i.e. to .
The RMS value is always independent of the time phases of the field
components.
The averaging (integration) time for the RMS calculation is fixed at 1 second
to conform with the relevant personal safety standards.
Operating mode Transfer function
EXPOSURE STD • Takes the frequency response of the limit value curve and
the selected exposure range into account.
• Attenuation occurs at the frequency range limits.
ª Band limits: see page C-4
FIELD STRENGTH • Is independent of frequency (flat) over a wide range.
• Attenuation occurs at the frequency range limits.
ª Band limits: see page C-4
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