Where is the external or tip reference in ONIX data files?

[Junying Su]

Dear OpenEphys developers, 

I have an issue about loading the ONIX data files. I found that there is only 384 channels of data in these files when I loaded the data files following the program described in this website.

https://open-ephys.github.io/bonsai-onix1-docs/articles/hardware/np1e/load-data.html

But actually, an additional channel of data should be in these files, which is the external or tip reference, similar with the continuous.dat files generated by OpenEphys[GUI].

We can use this channel of data as reference and correct the 384 channels of data.

So how can I acquire this channel of data?

Thank you.

[Josh Siegle]

Hi Junying,

384 channels is the expected number for these files. The subtraction of the reference signal happens across all channels prior to amplification/digitization, so this channel cannot be recorded.

The Open Ephys GUI has the option to send the PXI basestation's digital input as a 385th channel – perhaps this is what you're thinking of?

Josh

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[Junying Su]

OK, I see. Thank you.

在2025年2月11日星期二 UTC+8 07:10:18<Josh Siegle> 写道：

Hi Junying,

384 channels is the expected number for these files. The subtraction of the reference signal happens across all channels prior to amplification/digitization, so this channel cannot be recorded.

The Open Ephys GUI has the option to send the PXI basestation's digital input as a 385th channel – perhaps this is what you're thinking of?

Josh

On Sun, Feb 09, 2025 at 6:26 PM, Junying Su <s2742...@gmail.com> wrote:

Dear OpenEphys developers, 

I have an issue about loading the ONIX data files. I found that there is only 384 channels of data in these files when I loaded the data files following the program described in this website.

https://open-ephys.github.io/bonsai-onix1-docs/articles/hardware/np1e/load-data.html

But actually, an additional channel of data should be in these files, which is the external or tip reference, similar with the continuous.dat files generated by OpenEphys[GUI].

We can use this channel of data as reference and correct the 384 channels of data.

So how can I acquire this channel of data?

Thank you.

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You received this message because you are subscribed to the Google Groups "Open Ephys" group.

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