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Thread: Jumpy TDR Trace


Permlink Replies: 2 - Pages: 1 - Last Post: Sep 26, 2007 9:08 AM Last Post By: dweinstein
dweinstein

Posts: 11
Registered: 02/08/06
Jumpy TDR Trace
Posted: Sep 24, 2007 2:58 PM
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I sent this question below to OJ back in February and I just sent it again as I haven't received any answer. I assume it just got lost in the shuffle as OJ is always very responsive to my queries. Unfortunately, I couldn't e-mail the .mov file of the E8361A PNA screen as the file is larger than my company server will permit. I will try on my personal e-mail to forward it to OJ.

Perhaps someone else has observed this and has an answer.


Each time I change a time domain setting (for example-change the gate center by moving the knob), the trace “flattens out” and then returns to normal. This “flattening” is not due to the IF bandwidth being set too high. this is not a "noisy or unstable" trace due to too high IF bandwidth. It is at 1 KHz, and this jumpiness did not occur in earlier firmware revs.

I also notice that when I click the mouse cursor in a box to type some dialog, very often, the first time I click, it does not seem to “take”. I have to click again before I can type anything.
Dr_joel


Posts: 2,733
Registered: 12/01/05
Jumpy TDR Trace
Posted: Sep 25, 2007 3:32 PM   in response to: dweinstein in response to: dweinstein
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Hello, we've confirmed what you see. It appears to be due to the abort process in the PNA (when you hit the key, it apports the data and starts a new sweep, and apparently the abort is zeroing some portion of the data). It's an odd problem, and one of the firmware engineers is looking at it now.
dweinstein

Posts: 11
Registered: 02/08/06
Jumpy TDR Trace
Posted: Sep 26, 2007 9:08 AM   in response to: dweinstein in response to: dweinstein
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Thank you very much. It drives me crazy.

David

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