"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