ECG project circuit osciliiscope only show mains frequency.

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fanshenren

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HI I am doing a school ECG project, I used the circuit design in the AD620 Datasheet. How come when I implenmented the design, I still get 50 Hz mains frequency?
When I ground the body, I dont get anything displayed on the osciliscope.
Any one can help me?
thanks
 

Just about all biometric measurements require a differential amp. The ground connection is made to the ankle or wrist. ( I've forgotten what ECG stands for; Cardio? )
 

Thanks guys I have got it working now. I will try to eliminate some high frequency noises.
 

There is need to implement some filters at ECG circuits :
HighPass 2Hz > Base-line reduction
BandRegection 35-50Hz > Muscle interference
BandRegection n*2*50Hz > Sampling rate following this rule eliminates AC main
Click to expand...

Remember to shield PCI with grounded plate bellow.
ECG signals have a range of ~1mV and hardware care must be take.

+++
 

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