David,
Did you check the obvious, that a jump in amplitude occurs
when the modulation is switched on? A wild transient?
Knowing how GFI are made, I'm surprised this has not been a
problem noted here before.
- Robert -
On Fri, 13 Jan 2006 18:26:26 -0600
"Garnier, David S (GE Healthcare)"
<[email protected]> wrote:
> Hello everyone,
>
> I have been testing a product that has a ground fault
> interrupter (GFI)
> circuit breaker in it, I am wondering if anyone else has
> had similar
> experiences with products containing GFI circuit
> breakers?
>
> During RF immunity testing, at 5 V/m to 10 V/m level,
> within a frequency
> range of 800-900 MHz, the GFI breaker immediately trips
> when AM
> modulation is switched on. (I can think of a number of
> mechanisms
> for this behavior, the least of which are, dissimilar
> metal junctions
> in the neutral panel sense wire.)
>
> There are a few manufactures that make GFI IC's, such as
> Fair-Child
> and National Semiconductor, both which use a liberal
> amount of
> diodes (on the die) to allow powering the IC directly off
> the AC line.
> (Don't need no stinking power transformer in these
> designs!) ;-)
>
> These GFI's aren't quite as interesting as the new ARC
> detection
> breakers... Either way, this has been an interesting
> experience.
>
> Thanks to all that reply.
>
> Dave Garnier
>
-
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