Dave,
I have had GFI’s hiss and hum visciously, almost like a thing alive, while
firing up the ham radio with indoor antennas.
Dave
_____
From: [email protected] [mailto:[email protected]] On Behalf Of Garnier, David
S (GE Healthcare)
Sent: Friday, January 13, 2006 5:26 PM
To: [email protected]
Subject: RFI breakers being tripped during RF immunity testing
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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