HBM Genesis GEN5i User Manual page 418

Amplifier Bandwidth and Filtering
Using different filter selections (Wideband/Bessel IIR/FIR/etc.) or different filter bandwidths will lead to phase mismatches between channels.
Wideband
Bessel IIR (Fc @ -3 dB)
FIR (Fc @ -0.1 dB)
FIR (Fc @ -3 dB)
Supported by Perception V6.40 and higher
Wideband
When wideband is selected there is neither an analog anti alias filter, nor any digital filter in the signal path. Therefore there is no anti alias
protection when wideband is selected.
Wideband bandwidth
Passband flatness
(1) Measured using Fluke 5700 calibrator, DC normalized
418
When wideband is selected there is neither an analog anti alias filter, nor any digital filter in
the signal path. Therefore there is no anti alias protection when wideband is selected.
Should not be used if working in frequency domain with recorded data.
When Bessel IIR filter is selected, this is always a combination of an analog Bessel anti
alias filter and a digital Bessel IIR filter.
Bessel filters are typically used when looking at signals in the time domain. Best used for
measuring transient signals or sharp edge signals like square waves or step responses.
Standard FIR filter with corner frequency (Fc) defined at -0.1 dB.
When FIR filter is selected, this is always a combination of an analog Butterworth anti alias
filter and a digital FIR filter.
Best used when working in the frequency domain. When working in the time domain this
filter is best used for signals that are (close to) sine waves.
Adapted FIR filter with corner frequency (Fc) calculated as close as possible to -3 dB.
When FIR filter is selected, this is always a combination of an analog Butterworth anti alias
filter and a digital FIR filter.
Best used when working in the frequency domain. When working in the time domain this
filter is best used for signals that are (close to) sine waves.
Between 540 kHz and 690 kHz (-3 dB)
(1) 0.1 dB; DC to 150 kHz
Figure A.61: Typical wideband overview and passband flatness
GEN5i
I2679-4.0 en