Oscilloscope Reference Math arbitrary filters
The following table lists the available normalized band pass filters:
File name Normalized bandwidth Normalized center frequency
bandpass_0.05bw_0.05center.flt
0.05 0.05
bandpass_0.05bw_0.10center.flt
0.05 0.10
bandpass_0.05bw_0.15center.flt
0.05 0.15
bandpass_0.05bw_0.20center.flt
0.05 0.20
bandpass_0.05bw_0.25center.flt
0.05 0.25
bandpass_0.05bw_0.30center.flt
0.05 0.30
bandpass_0.05bw_0.35center.flt
0.05 0.35
bandpass_0.05bw_0.40center.flt
0.05 0.40
bandpass_0.05bw_0.45center.flt
0.05 0.45
xxx
Band stop filters
Each filter has a bandwidth of 0.1 times the sample rate. They will operate at a ny sample rate. The
available center frequencies are 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, and 0.40. Stop band attenuation is
approximately – 110 dB, however, the noise floor of the oscilloscope w ill not allow for that depth.
With an FFT and long record length, and averaging turned on, one can approach noise floors in the –
110 dBm range on an 8-bit oscilloscope. However, the oscilloscope will have some spurious signals
above that floor. This is possible because the FFT is an average calculation internally and the averaging
function increases the vertical bits of resolution.
860 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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