Eclipse Additional Information Page 42
The effect of the Low Pass Filters of the Amplifier
The filter cut off high frequencies chosen by the user. The low pass filter improves the recording conditions
by attenuating unwanted frequency components (noise) and instead allows only the waveform response to
be recorded.
The frequency you choose for the low pass filter is the maximum frequency to record.
The picture below shows the different low pass filters frequency response and steepness for the Eclipse at a
DSP sampling rate of 30kHz.
The low pass filtering is applied by the DSP (digital signal processor) and is a digital FIR filter of the 102
nd
order.
An example of the effect of low pass filtering (LP) is shown below. Note that the hardware LP was changed
prior to each recording under the System Setup, while the display filter was not changed.
Here the low pass filters away unwanted higher frequency components and the waveform response get
cleaner and cleaner.
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