Comments (9)
SteveNg2013
commented on July 17, 2024
1
Thanks. I will do it tomorrow and let you know. Just in case you’re
wondering, I’m in Sydney Australia.
…On Thu, 22 Feb 2024 at 10:45 pm, Adrian Suciu ***@***.***> wrote:
There are 2 waveforms in the buffer.
The stimulus and the response.
There is no stimulus, and therefore there is no response ... the
acquisition is correct though - you are seeing a (probably) floating signal
around 0 volts
It almost looks like the circuit/connections have spurious failures - are
you using a breadboard ? Can you confirm you are getting the same spikes
when running the network analyzer in a loop (without a device under test)
.. simply loop W1 to 1+ and W2 to 2+. You could also try different
connection wires.
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adisuciu
commented on July 17, 2024
Is it possible to update to the latest Scopy v1.4.1 ?
If the bug still persists, you can use the network analyzer buffer previewer functionality that shows the time domain waveform for different samples when acquired.
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SteveNg2013
commented on July 17, 2024
I updated to 1.4.1 and still found the spikes. I am attaching a screen grab with the buffer preview. A look at the buffer at the point of the spikes shows nothing captured in the buffer. Is my interpretation correct? Question obviously is why the hiccup which occurs quite randomly?
Screenshot 2024-02-22 at 9.49.00 pm.pdf
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SteveNg2013
commented on July 17, 2024
Adrian,
Thanks for taking a look at the problem and your suggestion. I also wanted to add that I ran the same simulation in a Linux Mint 20 virtual machine on the same iMac and saw the same randomly occurring spikes.
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adisuciu
commented on July 17, 2024
There are 2 waveforms in the buffer.
The stimulus and the response.
There is no stimulus, and therefore there is no response ... the acquisition is correct though - you are seeing a (probably) floating signal around 0 volts
It almost looks like the circuit/connections have spurious failures - are you using a breadboard ? Can you confirm you are getting the same spikes when running the network analyzer in a loop (without a device under test) .. simply loop W1 to 1+ and W2 to 2+. You could also try different connection wires.
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SteveNg2013
commented on July 17, 2024
Adrian,I tried looping directly as you suggested, the same random spikes occurred. Yes, I am using a breadboard. I even changed breadboards but the same problem occurred. As for the wires, apart from the connectors that came with the ADALM2000 which I can’t do much about now, I’ve tried different wires and the problem did not go away. I wonder if there is a problem with either the ADC or the DAC in the ADALM2000.Thanks.Sent from my iPadOn 22 Feb 2024, at 10:45 pm, Adrian Suciu ***@***.***> wrote:
There are 2 waveforms in the buffer.
The stimulus and the response.
There is no stimulus, and therefore there is no response ... the acquisition is correct though - you are seeing a (probably) floating signal around 0 volts
It almost looks like the circuit/connections have spurious failures - are you using a breadboard ? Can you confirm you are getting the same spikes when running the network analyzer in a loop (without a device under test) .. simply loop W1 to 1+ and W2 to 2+. You could also try different connection wires.
—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***>
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adisuciu
commented on July 17, 2024
We've tracked this down to the firmware version. Can you confirm that downgrading to firmware v0.31 fixes the problem ?
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SteveNg2013
commented on July 17, 2024
Hello Adrian,
Thanks for tracking down the problem. I downgraded to v0.31 and can confirm that I have not seen any spikes in the traces. Thanks again.
… On 27 Feb 2024, at 10:34 pm, Adrian Suciu ***@***.***> wrote:
We've tracked this down to the firmware version. Can you confirm that downgrading to firmware v0.31 fixes the problem ?
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adisuciu
commented on July 17, 2024
Thanks, we're looking into a fix in the firmware ..
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