Author Topic: What are the dark rectangles on the logic analyzer waveform?  (Read 526 times)

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Offline herbkanis

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What are the dark rectangles on the logic analyzer waveform?
« on: March 10, 2018, 02:52:54 am »
Hi,
Has anyone seen dark rectangles like the ones in the waveform capture I’ve attached?
The logic is from an Epson Printer and I’m using a Diligent Discovery 2 to get the waveforms.

Thanks for any help,

 

Offline MarginallyStable

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Re: What are the dark rectangles on the logic analyzer waveform?
« Reply #1 on: March 10, 2018, 04:40:27 am »
I'm not sure if relevant for your analyzer, but may be glitch detection. Some analyzers have circuitry to detect glitches that are smaller than the instrument's sample period. 
 
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Offline Paul Rose

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Re: What are the dark rectangles on the logic analyzer waveform?
« Reply #2 on: March 10, 2018, 05:29:50 am »
Yes.

https://reference.digilentinc.com/reference/software/waveforms/waveforms-3/reference-manual

The online Waveforms manual section 4 ( Main Plot ) point  12:

Quote
Noise band indicating glitch or higher frequency components than the sampling frequency. See Real
channels options.

On figure 4.1, the corresponding label 12 shows a dark background for a portion of the plot
 
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Offline herbkanis

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Re: What are the dark rectangles on the logic analyzer waveform?
« Reply #3 on: March 10, 2018, 05:32:57 am »
Both answers are correct. I did a search for "Wavegen" and "Glitch" on marginallystable's suggestion and found the reference that Paul gave.
Thanks to you both!
Cheers
 


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