Jonas, longer leads will introduce two problems: 1) Motion artifacts 2) Mains interference.
The 1st can be mitigated by securing lead wires to the subject so that movement and additional wire weight doesn't change the skin-electrode interface. The 2nd can be addressed with notch filtering of mains frequency and associated harmonics (FFT signal and see what harmonics are causing issues). Worst case, or if you want to avoid filtering, use shielded wire for the leads and connect the shield to the RL drive terminal on the Shimmer ECG. -Ben On Wed, Apr 4, 2012 at 7:44 AM, Jonas Lucchesi <[email protected]> wrote: > > Hello, > > I'm developing an application using ECG sensor and it woud be interesting > if I could use longer leads (about 1 ~ 2 meters). Do someone know if using > leads in that size will bring me problems in signal acqusition (like much > more noise, or anything else that couldn't be handled) ? > > Thanks, > > Jonas > > _______________________________________________ > Shimmer-users mailing list > [email protected] > https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users > _______________________________________________ Shimmer-users mailing list [email protected] https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users
