glitches on digital lines

Post any questions you may have about our current range of oscilloscopes
Post Reply
bonelli
Newbie
Posts: 0
Joined: Thu Jul 16, 2015 9:50 am

glitches on digital lines

Post by bonelli »

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

Martyn
Site Admin
Site Admin
Posts: 4491
Joined: Fri Jun 10, 2011 8:15 am
Location: St. Neots

Re: glitches on digital lines

Post by Martyn »

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

Post Reply