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Subject: Re: Point of isolation for an isolated Analog Input

Date: 05/17/00 at 5:54 AM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: Point of isolation for an isolated Analog Input posted by toysl on 05/16/00 at 9:01 PM:

Hi, Lee.

Your views are essentially correct. A linear optocoupler for the analog signals, if I recalle, can't do much better than 2% or so of full scale for accuracy whereas a digital representation has no such problem.

However, you have to be careful about the term "surge". While I could agree that optocoupling as early in the signal chain as possible can be helpful, if by "surge", we refer to lighning induced surges as defined in IEC-61000-4, protection will have to rely on more than just the use of optocoupling.

Good luck.

John Dunn - President
Ambertec, Inc.

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