Thanks for such a prompt and effective reply.

I've ordered the meter and I'll provide some feedback when I'm able to map
the magnetic fields in the engine room.

Dave

"Eisboch" wrote in message
...

"Dave Isherwood" wrote in message
...
Good Evenin' All,

I've just been fitted with a cardiac defribulator. This device comes with
instructions to avoid using cell phone in right ear and keep power-tools
12" away from the device. Seems the risk is that strong magnetic fields
may damage the programming and cause the device to reset.

I currently live on a 53' Carver and the engine room has a lot of
electrical equipment: 50A Charging / Inverter, 2*Starters / Transformers
on the engines and Generator. My concern is that there is the potential
for a sizable magnetic field in the engine room and I simply don't (short
of saving up a few pennies and getting a crew) know how to avoid or
manage the issue.

Questions:

1. Has anybody had to consider this problem? What it a problem?
2. Any clever way I can judge the strength of the magnetic fields?

Thanks,

Dave


No knowledge, but it would seem it's something you need to look into,
particularly the charger, which has a pretty big transformer in it.

Magnetic field strengths are typically measured with a device called a
"gauss meter". Here's an example of a reasonably inexpensive, portable
one:

http://www.escience.ca/genSci/RENDER...056/11098.html

Once you've determined if there is a problem or not, there is a metal
alloy, available in sheet form, called "Mu-Metal" that is used to make
effective shielding of magnetic fields. It's available from industrial
metal suppliers.

http://en.wikipedia.org/wiki/Mu-metal

Eisboch