- Joined Jun 19, 2020
What bandwidth oscilloscope is sufficient for a first time electronic hobbyist looking to just see what this device can do.
That's not entirely correct.The bandwidth of a scope is the frequency at which the displayed deflected voltage is at 50% the applied value due to frequency limitations of the scope.
e.g if a 100MHz scope was fed a 100MHz sine-wave at 10V peak to peak, the scope would display this as 5V peak to peak.
As a general rule of thumb, you should avoid using a scope at frequencies above 1/10 of its bandwidth to avoid measurement/display errors.
Remember that square waves have high frequency harmonic content, so you need to consider the rise time response of the scope.
These days you can by a small screen 1MHz scope for less than £35.
Note from the specification, although it has a claimed bandwidth of 1MHz, it has a sampling rate of 5MS/s. So in theory a 1MHz sine-wave would display at 50% and the complete sine-wave would be made-up from 5 sample points.
I’m not recommending you buy the ebay product – it is likely to be poor quality and very difficult to operate given the lack of controls.
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by Jake Hertz
by Luke James