A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: ADS1292R Other Parts Discussed in Thread: ADS1292
Hello,
I am using ADS1292R for acquiring ECG from human body. But there is one problem which is persisting that ECG QRS complex changes its DC value. Any explanation will help. Thank you for your time.
This can be an issue sometimes when dc coupling dry electrodes. Make sure that the electrodes are firmly attached to the patient (you can utilize the ADS1292R's built-in lead-off detection functionality) and that you are using the right-leg drive functionality of this device.
Yes i am using ADS1292R's right-leg drive functionality. I am using wet electrodes instead of dry electrodes. I have also attached hardware schematic for your reference.
I didn't actually grasp what you meant by "dc coupling of dry electrodes".
What I meant by dc coupling is a connection between the patient and the inputs to the device that does not include any high-pass filtering. For example, channel 1 uses a high-pass filter for the respiration measurement. Those inputs are ac coupled.
One thing I noticed is that you have bit 4 of the CONFIG2 register set. This bit enables the 4V internal reference, but should only be used if the internal reference buffer has enough headroom to create a 4V reference i.e. AVDD - AVSS = 5V. In your schematic, it looks like you are using a 3.3 V analog supply. If you clear that bit to use the internal 2.4 V reference, do things improve?
I have changed it back to 3.3V reference. It doesn't improve things still i am getting DC shift in my ECG. There is any way to remove like using AC coupled input as it used for respiration input. Any help on hardware side will be appreciated.
Your hardware looks valid, and you are using wet electrodes, so it does not seem like this is a hardware issue. Are you able to successfully measure the internal test signal?
