not detecting a 100uV DC signal generator
giuseppetx1
Italy
Hi, and pleased to meet you all. I have just registered on the forum...
I am using Cyton board and trying to amplify a low DC signal (about 100 microVolts) generated directly from a signal generator.
I have connected the output signal to one of the SNP pin of the OpenBCI board (for example, the n. 2).
Then I have grounded the DC signal generator and the board connecting the ground with the GND pin of the OpenBCI.
I am not seeing any signals on the OpenGUI.
Surely I am getting many thins wrongs...Could you help me in some way?
Thank you to youall in advanced....
G.
I am using Cyton board and trying to amplify a low DC signal (about 100 microVolts) generated directly from a signal generator.
I have connected the output signal to one of the SNP pin of the OpenBCI board (for example, the n. 2).
Then I have grounded the DC signal generator and the board connecting the ground with the GND pin of the OpenBCI.
I am not seeing any signals on the OpenGUI.
Surely I am getting many thins wrongs...Could you help me in some way?
Thank you to youall in advanced....
G.
Comments
I have not yet an AC generator, only DC.
Do you think can it work?
I have likely got something wrong because I cannot retrive any signals,
only noise (1uV Vrms).
Thank you, Giuseppe.
Just another task....sending a 100 uV AC to the N2P pin (for example) of the Open BCI board
I see almost the whole signal (just below 100 uV) with the PGA Gain setted at x24.
While setting it at x1 o others the signal acquired drops down to a few tens of uVrms (20 or 30)...
What does the PGA Gain mean at the end???
Thank you for your support !
G.
Because in the datasheet pag 69 and figure 74 a sine generator is connected to the PGA using the GND...
http://www.ti.com/lit/ds/symlink/ads1299.pdf
Thanks a lot for you help!