16 Jul '12, 7pm

Scope bandwidth: trickier than you think!

Scope bandwidth: trickier than you think!

I’ve been working on some materials for students recently, and this forced me to think about the way bandwidth is specified on oscilloscopes. At first glance, a specification such as bandwidth seems like a fundamental concept. Bandwidth tells you the highest frequency you can measure, right? Well, yes and no. Interpreting the bandwidth of the scope as a maximum allowable frequency is a trap most of us have fallen into at one time or another. Let’s start with a definition of bandwidth. Oscilloscope bandwidth is the frequency at which a sinusoidal input signal is attenuated by 3 dB, which is 70.7% of the signal’s true amplitude. This means that at its specified bandwidth, the instrument can show as little as 70.7% of the actual amplitude of the signal. In other words, the amplitude you see on the display can be as much as 29.3% low. So looking at signals with frequencies at ...

Full article: http://www.edn.com/electronics-blogs/scope-guru-on-signal...

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