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What does 20 MHz mean on oscyloscope?

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ash

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oscyloscope

What does mean 20 MHz? I see text that 20 Mhz,50 Mhz,100 Mhz on oscyloscopes.
 

Re: 20 MHz Oscyloscope

It is the bandwidth of the Y-amplifier.
At that frequency the amplitude displayed drops by 3dB. Say you have a signal of 1Vpp. If the frequency is equal to the bandwidth, then the scope will display the signal as having only 0.707Vpp.

So it's a measure of how "good" the scope is. For home projects even a 10MHz scope can be extremely useful. I personally have a 25Mhz one.
 

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