800000 data in SD card log

pluto

Hi All,

I came across an SD card recording and saw values as 800000, as of now I am not sure on what settings the data was collected, but I am sure that it was for all 8 channels.

Here is a snapshot for the recorded data:

[image removed, see next comment below]

What does that 800000 data represent?

Thanks and appreciate for your help in advance.

Regards,
Pluto

wjcroft

Hi Peter,

The image file you uploaded above was 85 megabytes, this is HUGE and not appropriate for our server. It was both extremely slow to display (30 seconds or so) and wastes space on our file / web server. Please take care with future uploads, I uploaded a much shorter version here:

This is something that could have been uploaded as pure text.

As far as the interpretation of the 800000, the top bit there could be considered as a 'sign' bit for a 23 or 24 bit value. The samples on the ADS1299 chip are 24 bits in length. If you did not disable those channels from the GUI, all I can guess is that the ADS1299 chip temporarily got into a funny state and froze those channels. Are you sure you did not simply toggle the channel number on those lines of the Time Series to effectively turn off the channels?

William