the unit of EMG data

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guozhenhui
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Joined: Fri Sep 17, 2021 2:30 pm

the unit of EMG data

Post by guozhenhui »

hello! what is the unit of the EMG signals obtained by ActiView? Is it related to the "Y-scale V/Div" which is on the left of this software? I chose "500uv" in the "Y-scale V/Div". Then I plot the signals in MATLAB and the y-axis range is 2000-3000. what is the unit of the y-axis and what is the mean of the Y-axis?
looking forward to your answer.

Coen
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Re: the unit of EMG data

Post by Coen »

The scaling of each channel is found in the BDF header, see https://www.biosemi.com/faq/file_format.htm (physical and digital min/max values). The electrode channels are LSB = 31.25 nV (1/32 uV). The scaling in ActiView does not affect the BDF file. All settings in the left sidebar only affect the display.

Best regards, Coen (BioSemi)

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