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From: Jim Fidler (no email)
Date: Fri Jan 02 2004 - 01:01:30 EST
Thanks Arild
I suspected something like this but don't understand the details.
I was surprised to find that repositioning the wire within the clamp
jaws didn't really affect the reading much at all. I expected it to.
Maybe they've figured out some way to compensate. One
possibility is that these jaws are small, just over 1 inch
across. Might not even fit 4/0 cable.
I will be careful and try to be consistent.
Jim Fidler "Fiddlesticks"
==========================================
REPLY
Clamp on DC meters use a Hall effect sensor for the DC measurements.
A hall effect device measures magnetic flux intensity instead of being a
simple
transformer like the AC clamp on meter is.
A note of caution concerning these devices.
The position of the wire within the clamp jaws is important.
You can produce large discrepancies if you move the jaws around.
Comparing readings from circuit to circuit requires a bit of care.
Arild
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