Products > Test Equipment
SDS1104X-E Eye Pattern
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tomas1808:
I bought a Sigilent SDS1104X-E with the intention of using it for measuring the ethernet signal integrity of a device.

Does this scope have the function to do "Eye Pattern" test? The scope is hacked to 200MHz and have passive probes to match it.

I am new to digital scopes (been using a 7704A mainframe for a long time) so I still got to learn most of this scope's features.

Hope I didnt buy this scope in vain  :P

Thank you!
tautech:
Very quick check with 10 MHz square wave. Scope settings visible in menus and OSD.
tomas1808:
Nice! Never seen alternate triggering before! Ty
bdunham7:
The SDS1104X-E really doesn't have an eye pattern function and even 200MHz BW is probably not enough for your application.  That is usually an extra-cost option on higher-end scopes and not something that can be completely implemented at this level.  You can get an eye-like display on the scope with alternate triggering, but I think you miss a lot of information that way since you only see the traces that are immediately after a transition.  Also, what you select as the trigger point may not be ideal for lining up rising or falling edges. The window trigger function where you set it to trigger anytime the signal goes outside the middle core is probably better.  And of course there is no clock recovery like a scope with a true eye pattern test would have.  You can trigger off of a separate clock if you have one, but I don't think that helps in your case.  You also need a differential probe to do it properly with ethernet AFAIK.

You can get eye signals even with old analog scopes, but it gets a bit harder at higher BW.  Diagnosing bad laser pickups on CD players was a classic example of this.
Performa01:

--- Quote from: bdunham7 on June 23, 2022, 04:15:39 am ---The SDS1104X-E really doesn't have an eye pattern function and even 200MHz BW is probably not enough for your application.  That is usually an extra-cost option on higher-end scopes and not something that can be completely implemented at this level.  ...  And of course there is no clock recovery like a scope with a true eye pattern test would have.  ...  You also need a differential probe to do it properly with ethernet AFAIK.

--- End quote ---
Yes, having an Eye Diagram in a low bandwidth, low cost, entry level oscilloscope is not going to happen. Signal integrity checks on 100 Base T Ethernet require a minimum of 500 MHz bandwidth. For 1000 Base T, more than 1 GHz bandwidth is highly recommended.

Siglent decided to not offer this Application even on the SDS5000X, and this is already a 1 GHz midrange DSO.

Attached is a screenshot of the true Eye-Diagram application on a 2 GHz Siglent SDS6000.

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