CHAN SET tab options, elaboration
Hi Folks.
Can someone explain to me the Chan Set options. My primary interest is EMG.
PGA_GAIN - I understand this, it sets the gain of the input.
Input Type - What are the various options used for. If I want to use 2 electrodes and measure the difference between them what is the best setting. For example a Bar Electrode
Bias - How does include and not include affect the output.
SRB2 and SRB1 - and explanation.
Many thanks for any advice. Having programmed in Arduino for a while Processing is almost second nature and I am able to modify the GUI to preset the ADS1299 with specific values more suited to EMG.. Rather than having to set up every run time.
Many thanks
Dave
Can someone explain to me the Chan Set options. My primary interest is EMG.
PGA_GAIN - I understand this, it sets the gain of the input.
Input Type - What are the various options used for. If I want to use 2 electrodes and measure the difference between them what is the best setting. For example a Bar Electrode
Bias - How does include and not include affect the output.
SRB2 and SRB1 - and explanation.
Many thanks for any advice. Having programmed in Arduino for a while Processing is almost second nature and I am able to modify the GUI to preset the ADS1299 with specific values more suited to EMG.. Rather than having to set up every run time.
Many thanks
Dave
Comments
The tutorial suggests you consult the TI data sheet,
http://docs.openbci.com/tutorials/01-GettingStarted#getting-started-w-openbci-v-connect-yourself-to-openbci-4-launch-the-gui-and-adjust-your-channel-settings
http://www.ti.com/lit/ds/symlink/ads1299.pdf
Page 44, Channel Input mux, bits 0-2 explain the various values. You really only want to use the default, Normal.
Bias should be left in the default state for your EEG channels, it's used in common mode noise rejection and centering the differential amps. You should NOT include on your ECG channels. This is what the tutorial explains.
SRB1 & 2, see the TI data sheet. SRB2 is the default common reference bus for the IN*N pins (closest to board). In general you won't need SRB1, it functions correspondingly with the IN*P pins. Your EMG / ECG channel(s) do NOT use the common reference, hence should be excluded from SRB2.
You need to have the one Bias connection for the EEG channels, even though it's not used on your ECG.