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Bandwidth limit
D.E.V.I.C.E. is an encyclopedia of terms used by manufacturers of test and measurement equipment. T&M Atlantic created this service to better explain the functionality of instruments it offers, and to highlight the latest developments in the world of measurement equipment. We are using such tools as animation to bring words and pictures to life and to create not just an understanding but also an appreciation for technology that goes into the design of every instrument.
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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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