[Shimmer-users] ECG signal corrupted

[Paloma Vaquero]

Hello,



we are using an ECG sensor and the Shimmer Connect to visualize the acquired
data. If the sensor remains in a rest position we can see the ECG waveform
described in "ECG User Guide", but when we shake the sensor the depicted
signal gets corrupted, something like if the movement in the sensor will be
disturbing the ECG channels (it seems like the accelerometers signals are
coupling to the ECG). We have tried with several ECGs and we get the same
results.

Could someone please help me with this issue?





Thank you and best regards,

Paloma.

[Jong Chern Lim]

Hi Paloma,



The corrupted signal shouldn't be caused by the Accelerometer. I would
recommend taking a look at Section 3.2 of the Shimmer ECG User guide, which
highlights how to acquire a high quality ECG signal. I hope that helps.



Best regards,

Jong Chern







From: shimmer-users-***@eecs.harvard.edu
[mailto:shimmer-users-***@eecs.harvard.edu] On Behalf Of Paloma Vaquero
Sent: 22 April 2013 12:04
To: shimmer-***@eecs.harvard.edu
Subject: [Shimmer-users] ECG signal corrupted



Hello,



we are using an ECG sensor and the Shimmer Connect to visualize the acquired
data. If the sensor remains in a rest position we can see the ECG waveform
described in "ECG User Guide", but when we shake the sensor the depicted
signal gets corrupted, something like if the movement in the sensor will be
disturbing the ECG channels (it seems like the accelerometers signals are
coupling to the ECG). We have tried with several ECGs and we get the same
results.

Could someone please help me with this issue?





Thank you and best regards,

Paloma.

[Paloma Vaquero]

Hello Jong,



we have revised again Section 3.2 of the Shimmer ECG User Guide and followed
the described steps. But we have the same situation, when the sensor has no
movement, the received signal at ECG_RALL looks like an ECG signal (see
attached figure “screenshot_ECG_static.png”); but when we move the sensor,
the ECG signal is corrupted by the accelerometer coupling (see attached
figure “screenshot_ECG_dynamic.png”). Do you have any suggestion to solve
the problem?



Thank you very much and best regards,

Paloma.





De: Jong Chern Lim [mailto:***@shimmer-research.com]
Enviado el: miércoles, 24 de abril de 2013 16:05
Para: 'Paloma Vaquero'
CC: shimmer-***@eecs.harvard.edu
Asunto: RE: [Shimmer-users] ECG signal corrupted



Hi Paloma,



The corrupted signal shouldn't be caused by the Accelerometer. I would
recommend taking a look at Section 3.2 of the Shimmer ECG User guide, which
highlights how to acquire a high quality ECG signal. I hope that helps.



Best regards,

Jong Chern







From: shimmer-users-***@eecs.harvard.edu
[mailto:shimmer-users-***@eecs.harvard.edu] On Behalf Of Paloma Vaquero
Sent: 22 April 2013 12:04
To: shimmer-***@eecs.harvard.edu
Subject: [Shimmer-users] ECG signal corrupted



Hello,



we are using an ECG sensor and the Shimmer Connect to visualize the acquired
data. If the sensor remains in a rest position we can see the ECG waveform
described in “ECG User Guide”, but when we shake the sensor the depicted
signal gets corrupted, something like if the movement in the sensor will be
disturbing the ECG channels (it seems like the accelerometers signals are
coupling to the ECG). We have tried with several ECGs and we get the same
results.

Could someone please help me with this issue?





Thank you and best regards,

Paloma.

[Jong Chern Lim]

Hi Paloma,



Sorry to hear of your troubles. I have attached a screenshot of data
collected of ECG (via signal generator) and Accelerometer together. As you
can see from the ECG signal, it is not corrupted by any accelerometer
coupling. It might help if you go through the troubleshoot section and
verifying your ECG unit is working as it should. Also what results are you
getting when you disable the accelerometer?



Best regards,

Jong Chern



From: Paloma Vaquero [mailto:***@tsc.uc3m.es]
Sent: 26 April 2013 11:39
To: 'Jong Chern Lim'
Cc: shimmer-***@eecs.harvard.edu
Subject: RE: [Shimmer-users] ECG signal corrupted



Hello Jong,



we have revised again Section 3.2 of the Shimmer ECG User Guide and followed
the described steps. But we have the same situation, when the sensor has no
movement, the received signal at ECG_RALL looks like an ECG signal (see
attached figure “screenshot_ECG_static.png”); but when we move the sensor,
the ECG signal is corrupted by the accelerometer coupling (see attached
figure “screenshot_ECG_dynamic.png”). Do you have any suggestion to solve
the problem?



Thank you very much and best regards,

Paloma.





De: Jong Chern Lim [mailto:***@shimmer-research.com]
Enviado el: miércoles, 24 de abril de 2013 16:05
Para: 'Paloma Vaquero'
CC: shimmer-***@eecs.harvard.edu
Asunto: RE: [Shimmer-users] ECG signal corrupted



Hi Paloma,



The corrupted signal shouldn't be caused by the Accelerometer. I would
recommend taking a look at Section 3.2 of the Shimmer ECG User guide, which
highlights how to acquire a high quality ECG signal. I hope that helps.



Best regards,

Jong Chern







From: shimmer-users-***@eecs.harvard.edu
[mailto:shimmer-users-***@eecs.harvard.edu] On Behalf Of Paloma Vaquero
Sent: 22 April 2013 12:04
To: shimmer-***@eecs.harvard.edu
Subject: [Shimmer-users] ECG signal corrupted



Hello,



we are using an ECG sensor and the Shimmer Connect to visualize the acquired
data. If the sensor remains in a rest position we can see the ECG waveform
described in “ECG User Guide”, but when we shake the sensor the depicted
signal gets corrupted, something like if the movement in the sensor will be
disturbing the ECG channels (it seems like the accelerometers signals are
coupling to the ECG). We have tried with several ECGs and we get the same
results.

Could someone please help me with this issue?





Thank you and best regards,

Paloma.