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The linear-phase filter provides superior performance and is recommended over the
Butterworth filter. Use the Butterworth filters when it is required to match results with
other test systems.
The characteristics of these filters are shown in the following sections according to the
input channel type.
15.2.1 ELHLS and ELBRG Digital Filters
Butterworth Eight-Pole Filter
The Butterworth digital filter closely matches the attenuation and step response
characteristics of a conventional analog Butterworth filter. The magnitude, phase and
step responses are shown below.
Figure 15-1:
Magnitude response of an approximate eight-pole Butterworth filter.
The -3 dB frequency (break frequency) is 1500 Hz. The sharper than exact roll off in
the transition band is achieved by filtering the data stream using linear phase filters
before applying the approximate Butterworth filter.
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