ELT-400 Annex C: Instrument function
C-5
Settling time
The variation with time of the field under investigation is sampled at intervals
of about 1 µs. This means that the internal signal voltages reflect any
changes in the field immediately. The peak value is measured at the same,
high sampling rate. The displayed measurement value is updated every
250 ms.
The RMS value is always determined by integrating (averaging) the
variation in the field. Some personal safety standards specify an integration
(averaging) time of 1 second for the frequency range in question. The
ELT-400 takes this into account. The numerical result display will therefore
require a settling time of 1 second if there is a sudden increase in field
strength. Short-term changes in the field (e.g. pulses) lead, as intended, to
a smaller RMS value depending on the pulse duration. The display is
updated every 250 ms.
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