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<span style="font-family: helvetica; font-size: 14pt;">cheater cheater,</span>
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<span style="font-family: helvetica; font-size: 14pt;">Thanks for the info. Never knew the reason things were done at 5X. Just took it as that's the way things are done.</span>
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<span style="font-family: helvetica; font-size: 14pt;">Jay S.</span>
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On 04/29/2021 4:53 PM cheater cheater <
<a href="mailto:cheater00social@gmail.com">cheater00social@gmail.com</a>> wrote:
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On Thu, Apr 29, 2021 at 9:43 PM Jay Schwichtenberg via Synth-diy
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<
<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:
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As someone that has worked in T&M a lot I would look at lab grade ADCs
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and sample at 5X (400 KHz). Most test and lab equipment I've worked on
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or with goes for 5X sampling rate minimum. When doing science Nyquist
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rates aren't good enough in a lot of cases.
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Jay S.
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The reason for that is different. Historically, T&M equipment
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bandwidth was specified as "highest frequency at which you can see the
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signal's fundamental plus one harmonic plus a bit of the next harmonic
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after that". That's how analogue scopes were specified indirectly
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(their freq fall-off was so smooth that you could still see a bunch
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beyond the cutoff freq), and later digital ones. When the first
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digital scopes started coming out and manufacturers tried specifying
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bandwidth as nyquist frequency, there was so much backlash they
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thought twice. Not even current-day Chinese manufacturers will break
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that rule. They'd get laughed out of the court.
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