Karol is having trouble posting to this list at the moment, so I'm reposting a reply he tried to send earlier in the week:
From: Karol O'Donovan [mailto:[email protected]] > Sent: 20 Samhain 2012 08:16 > To: '[email protected]' > Subject: RE: ECG and EMG Calibration > > Dear Ulf, > That looks correct. The signal calibration is outlined in our EMG and ECG > user guides available here when you login.... > > http://www.shimmer-research.com/download/documentation > > In our Matlab, Android and LabVIEW instrument drivers we offer both raw > data > as well as calibrated data which is calibrated using the default offset and > gain values but do advise implementing your own calibration should you feel > the accuracy is required. > > Best Regards, > Karol > On Mon, Nov 19, 2012 at 4:45 PM, Ulf Jensen < [email protected]> wrote: > Hey guys, > i had a closer look into the calibration of EMG and ECG signals to derive > a formula that converts ECG output to measurements in mV. Here is what i > found: > > ECG: > Offset (optimal): 2048 > Gain factor (data sheet): 175 > ADC range: 3.0V (fullscale, -1.5V to +1.5V) > Measurement_in_mV = [ ( ADC range / 4095 ) * ( Measurement_from_ADC - > Offset) ] / Gain factor > > EMG: > Offset (optimal): 2048 > Gain factor (data sheet): 682 > ADC range: 3.0V (fullscale, -1.5V to +1.5V) > Measurement_in_mV = [ ( ADC range / 4095 ) * ( Measurement_from_ADC - > Offset) ] / Gain factor > > As shown in the Youtube videos, offset and gain can be corrected > accordingly. Can you please confirm that i am correct or provide any > explanation if i am wrong! > > Cheers, > Ulf > > -- > Dipl.-Inf. Ulf Jensen > Digital Sports Group > > Pattern Recognition Lab > Friedrich-Alexander-University Erlangen-Nuremberg > Haberstr. 2, 91058 Erlangen, Germany > > Phone: +49 (0)9131 / 85-27890 > E-Mail: > [email protected]**erlangen.de<[email protected]> > Web: > www5.informatik.uni-erlangen.**de/~jensen<http://www5.informatik.uni-erlangen.de/~jensen> > > ______________________________**_________________ > Shimmer-users mailing list > [email protected] > https://lists.eecs.harvard.**edu/mailman/listinfo/shimmer-**users<https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users> >
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