Re: Difference between a 475 and a 475A

Tom Lee

You're narrowly interpreting "inferior" to mean "slow", but there are other qualities to consider, such as overshoot, ringing, "dribble" and so on. If you allow a little extra overshoot, it's possible to have a higher bandwidth, for example, but if you're fussy about the time response, then that tradeoff would be considered inferior.

Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070

On 11/19/2020 17:58, Jeff Dutky wrote:
John Gord wrote:
the 475A was basically the same as the 475, but adjusted for higher bandwidth but perhaps slightly inferior pulse response
I'm not sure I understand what you are saying here: wouldn't "inferior pulse response" mean a longer rise time? Wouldn't a longer rise time necessarily mean a lower bandwidth?

I don't really understand all the math, but my impression, from evaluating my father's 475 and probes a couple months ago, was that you calculated bandwidth as the inverse of rise time multiplied by a constant (0.3-something?). Am I misunderstanding what is meant by "pulse response"?

-- Jeff Dutky

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