glitches on digital lines

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bonelli
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Joined: Thu Jul 16, 2015 9:50 am

glitches on digital lines

Post by bonelli » Thu Sep 20, 2018 12:20 pm

Hi,

When probing UART Tx/Rx signals with my 3204D-MSO, I sometime have some glitch on the lines.

Image

I did never experienced this kind of problem with other scopes (Lecroy, Rohde & Schwarz).

Changing the input threshold did not solve the problem. Some threshold results to unexpected results because the scope trigs on a glitch.

What is the input impedance of the digital lines ?
Thank you
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Martyn
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Location: St. Neots

Re: glitches on digital lines

Post by Martyn » Tue Sep 25, 2018 10:24 am

The input impedence of the digital lines is

200 kΩ ±2% ∥ 8 pF ±2 pF

can you post a psdata file so that we can see your settings, and let us know what trigger threshold values you have tried.
Martyn
Technical Support Manager
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