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Waveform analysis
R&S
®
MXO 5 Series
168User Manual 1802.3369.02 ─ 02
Envelope wfm selection
Selects the upper or lower part of the input waveform for mathematic calculation, or a
combination of both.
Remote command:
CALCulate:MATH<m>:ENVSelection on page 529
8.2.3 Math filter
Access:[Math] > "Filter" tab
The finite impulse response filter is a filter to create filtered math waveforms with low-
pass or highpass. The filter requires additional settings.
In remote control, filter settings are defined in the expression string, see CALCulate:
MATH<m>[:EXPRession][:DEFine] on page 527.
Type
Selects, if the filter is highpass or lowpass.
Source 1
Selects the input channel of the signal.
Cut-off
Sets the limit frequency for the filter.
Cutoff frequency for lowpass filter
The cutoff frequency depends on the horizontal resolution and the filter characteristics.
The frequency for the lowpass filter can only be set in this range:
f_g_3dB = (0.001 ... 0.2)* f_a_in for Gaussian FIR filter
f_g_3dB = (0,001 ... 0.4)* f_a_in for rectangular FIR filter
Where: f_g_3dB = cutoff frequency to be set for the lowpass filter, and f_a_in = recipro-
cal of the resolution, or sample rate.
Cutoff frequency for highpass filter
To check limit frequency for the highpass filter, convert it to an equivalent lowpass fre-
quency:
f_LP = f_a_in/2 - f_HP
Mathematics
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