Surely, someone out there has the vector equations describing the
magnetic field iof a classic Helmholtz coil. My vector equations class,
being 30+ years ago, is just too dim. I keep getting the derivation
wrapped around the axle. The centerline equation, H=0.716NI/r, is readily
available;
Don't forget, the low impedance path from the black (high side of
switch) to water to human to water to neutral (white wire.) It doesn't go
to ground and may not even trip the GFI!
hans_mellb...@non-hp-cupertino-om5.om.hp.com 09/02/97
06:33pm
You forgot two major assumptions:
1) The
The test setups I have seen for CE testing involve single phase
equipments. Looking for thoughts on EFT tests of high current
three-phase equipment.
Do I need to run A-B, B-C, C-A, A-GND, B-GND, C-GND, ABC-GND,
AB-GND, BC-GND, CA-GND?
Are there other combinations which must be addressed?
Who
We have, under development, a large piece of equipment which
we plan to sell in
Europe. Its size is 2.5 meters wide, 2.1 meters high, and up to
13 meters long.
Its weight is hundreds, if not thousands, of kilograms. Power
requirements
are 3-phase 440 vac with line currents exceeding 400 amps.
While you appear to be looking at
non-military applications, the U.S.
MIL-STD-1399/300A paragraph 5.2.9
limits the surge current per its Figures
14 and 15.
Jim Sketoe
Paul Herrick
0007515...@mcimail.com 04/22/97
09:09pm
-- [ From: Paul Herrick * EMC.Ver #2.3
] --
Does anyone know of any
We here at McDonnell Douglas have
done some testing to 120-140 gauss
range. The test object was about 24
inches in diameter and 3 feet long. Had
quite a problem generating the field over
that volume. The 120-140 range was
because of the copper heating. Glad to
discuss the issues with you.
The isolation aspect is limited to 60Hz
isolation. The prime power is
ungrounded. It will be fed through the
isolation transformer whose secondary
will be grounded to form a green wire
ground/neutral connection. For this I
don't think I need interwinding screens.
However, I don't quite
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