3 31023102 New Member Jul 26, 2011 #1 This is the output signal for my 3-lead ECG design. (it's acquired by hardware, not simulation) um...and it doesn't seem right, i m dying to know what happened, and the potential way to correct that. Thank u in advance Attachments 22.jpg 318.5 KB · Views: 263
This is the output signal for my 3-lead ECG design. (it's acquired by hardware, not simulation) um...and it doesn't seem right, i m dying to know what happened, and the potential way to correct that. Thank u in advance
Roff Well-Known Member Jul 26, 2011 #2 How do you expect us to diagnose the problem when we don't have a schematic? Last edited: Jul 26, 2011
Roff Well-Known Member Jul 28, 2011 #3 I guess he died. I should have tried to come up with an answer.
alec_t Well-Known Member Most Helpful Member Jul 29, 2011 #4 The OP doesn't have a name; just a number. Maybe the trace isn't of human origin, so it could be perfectly ok ;-)
The OP doesn't have a name; just a number. Maybe the trace isn't of human origin, so it could be perfectly ok ;-)
audioguru Well-Known Member Most Helpful Member Jul 29, 2011 #5 It is 60Hz mains hum because he didn't use the "right leg anti-common-mode noise rejection" circuit in a datasheet for an instrumentation amplifier. Maybe he didn't use shielded audio cable.
It is 60Hz mains hum because he didn't use the "right leg anti-common-mode noise rejection" circuit in a datasheet for an instrumentation amplifier. Maybe he didn't use shielded audio cable.
alec_t Well-Known Member Most Helpful Member Jul 29, 2011 #6 Well the trace has certainly got a dominant 60Hz component. If that's a human heart-rate then the patient sure is in trouble!
Well the trace has certainly got a dominant 60Hz component. If that's a human heart-rate then the patient sure is in trouble!
K KeepItSimpleStupid Well-Known Member Most Helpful Member Jul 30, 2011 #7 Looks like a florescent light output waveform. PS (alec_t): Loved the number comment
audioguru Well-Known Member Most Helpful Member Jul 30, 2011 #8 I betcha the circuit is built on a breadboard with lots of too-long antenna wires which pickup mains hum.
I betcha the circuit is built on a breadboard with lots of too-long antenna wires which pickup mains hum.