I am currently working on a project to measure complex impedance. This is done by introducing a current (~1mA) @ various frequencies (1k to 1M Hz). I would like to float all components in contact with the load. To do this, I would like to use an opto-isolator do to their availability and cheapness. I am having problems locating one for my specific use. Any suggestions?

Thanks.

PS - I have decided to not use an isolation transformer do to its funky frequency response.

 

Goggled: wideband medical isolation amplifier

A couple of articles you might want to research:

http://www.find-health-articles.com/rec_pub_16294711-a-bipolar-optocoupler-isolation-amplifier-high-precision-wide.htm

http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F41%2F20911%2F00969397.pdf&authDecision=-203

Ken

 

I am currently working on a project to measure complex impedance. This is done by introducing a current (~1mA) @ various frequencies (1k to 1M Hz). I would like to float all components in contact with the load. To do this, I would like to use an opto-isolator do to their availability and cheapness. I am having problems locating one for my specific use. Any suggestions?

Thanks.

PS - I have decided to not use an isolation transformer do to its funky frequency response.

I am very concerned that the above statements show a limited understanding of patient safety requirements.

IEC 60601-1 clearly defines the requirements for contact electrical apparatus

Look up "patient auxiliary current"

The following link may contain helpful ideas

http://www.freepatentsonline.com/5807253.html