BSC4 Operating Manual
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Document Number 15-183 Rev B Page 49 of 74
4.1.5. Filter Order
A. Settable for FIR Filter only
B. Higher order leads to steeper damping characteristics, but slower step response.
C. Lower cut-off frequency is possible with higher order, higher cut-off with lower order.
FIGURE 53 - FILTER ORDER
4.1.6. Frequency response
A. Calculate filter and show results in frequency domain of sine waves at the input of
different frequencies if successful.
B. Especially with IIR High pass. Band pass and Band stop, observe the graph carefully for
instability: A stable freq. response of an IIR filter is generally continuous and should
never exceed 0dB.
FIGURE 54 - FREQUENCY RESPONSE
4.1.7. Step response
A. Show filter output signal in time domain of standard step from 0 to nominal value at the
input at time=0.
B. Useful for determining settling time, e.g. for high-order FIR filter.
FIGURE 55 - STEP RESPONSE
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