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Waveform analysis
R&S
®
MXO 4 Series
177User Manual 1335.5337.02 ─ 05
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.
Cut-off frequency for lowpass filter
The cut-off frequency depends on the horizontal resolution and the filter characteris-
tics. 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 = cut-off frequency to be set for the lowpass filter, and f_a_in = recip-
rocal of the resolution, or sample rate.
Cut-off 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
Where f_HP is the requested highpass limit frequency and f_LP the equivalent lowpass
frequency that has to comply with the limits given above.
Characteristics
Selects if a Gaussian or a rectangular shape is used for the lowpass filter. The high-
pass filter is always Gaussian.
8.2.4 Math scale settings
Access:[Math] > "Scale" tab
Mathematics
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