Other Parts Discussed in Thread: ADS1298R
Hi,
my company has bought a ADS1298RECGFE-PDK Evauation Module and we are interested in the respiration signal.
First we tryed to read respiration data generated by a Patient Simulator (Rigel 333) with board configurations illustrated on ADS1298RECG-FE User's Guide Section 5.3 (the only one difference is that I've set Channel Control Register Gain to 1 instead of 6). The simulation reported next is with: Rate = 15 bpm, Imp = 500 Ohm, dR = 1.0 Ohm, Apne = off.
The results it's, IMHO, good. In one minute of recording I can count clearly 13 breaths and I can understand that there is two more on the beginning that I can't see because of "Unsettled Points to Remove" and convergence of the Low-Pass filter or probably some noise induced by me on starting operations (like involuntary touching ECG cables from Patient Simulator to Evaluation Board).
So until here it's all right.
After that we has choose to test on a Real Patient with medical electrodes (FIAB, Euro ECG Electrodes: F9089) positioned in V6 and V6R as shown in the image below:
We kept the same board configurations as the Patient Simulator test. To try to be in the most similar conditions possible to the previous test we used a metronome to simulate a breath rate at 15 bpm and this is the result:
We has test many times and the results is all like the one reported above, that are really far away from the ones from Patient Simulator.
The only one thing that change on the two kind of test is the source of data, where on first there is the Patient Simulator on second test there is connected electrodes positioned on the Patient (I mean that we use the same cables, same connectors and same electronics excepts for electrodes).
Someone has some suggestion or some explanation for what is happening? There is something that I don't understand or I don't see that will cause this difference in results?
Thank you very much in advance.
Best regards:
Manuel Bonini.
