Bandwidth limit is an oscilloscope mode when its upper frequency of the bandwidth intentionally reduces to the frequency which is several times lower. This mode allows making “signal/noise” ratio better for repetitive input signals with maximum frequency in the spectrum which doesn’t not exceed the oscilloscope limitation frequency. Meanwhile all parasitic spectrum components with higher frequencies (noises, pulse noises, leakage etc.) are excluded. It’s especially important for weak signals.
In the animated picture below you can see the following: when the bandwidth limit mode is on 25 MHz (the first picture) “signal/noise” ratio for input signal with the frequency of 1 MHz is much better comparing to the second picture where the bandwidth is full and equals 100MHz.
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