Do a 'pre-test'. Run the machine and walk round it with a wide-band
receiver in ever-increasing circles. Note what you pick up and where.
That gives a guide as to what might need to be measured more accurately
and/or suppressed.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-02-25 12:56, Jim Hulbert wrote:
Hi Tom,
The exemption in (b) is for electronic control or power system utilized by a
public utility or in an industrial plant. I don't believe the exemption
extends to machinery operated in those environments. And the exemption for
(c) is for test equipment used in industrial, commercial or medical
applications.
I agree....in-situ testing can be very difficult.
Jim H.
-----Original Message-----
From: T.Sato [mailto:[email protected]]
Sent: Friday, February 22, 2019 8:20 PM
To: [email protected]
Subject: Re: [PSES] **External**Re: [PSES] FCC Part 15 Testing in Situ
CAUTION: THIS EMAIL IS FROM AN EXTERNAL SOURCE. Internet links, office
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On Fri, 22 Feb 2019 14:39:46 +0000,
Jim Hulbert <[email protected]> wrote:
Yes, FCC requirements for this type of equipment are not very practical. As
a side note, such large equipment is industrial in nature, which may lead one
to believe they would fall under FCC Part 18 for ISM instead of Part 15.
However, Part 18 only covers industrial equipment that generates and locally
uses RF energy for the production of physical, biological, or chemical effects.
An industrial machine that does not utilize RF energy for these purposes is
not within scope of Part 18, and so Part 15 applies.
I guess large industrial machines which will not fall under Part 18 may often
be exempted from Part 15 (except for general conditions of operation),
especially due to 47 CFR 15.103 (b) or (c).
If the machine can't be exempted, although in-situ radiated emission
measurement can be very difficult, I think we need to measure them in-situ
individually at least for first three installations.
Regards,
Tom
--
Tomonori Sato <[email protected]>
From: John Woodgate [mailto:[email protected]]
Sent: Friday, February 22, 2019 3:05 AM
To: Jim Hulbert <[email protected]>;
[email protected]
Subject: **External**Re: [PSES] FCC Part 15 Testing in Situ
Such very large equipment tends to be custom-designed, so three identical
installations never exist. Even if there are three identical installations,
they are unlikely to be completed simultaneously, so how can the first two be
legally operated before the third is installed and tested?
I wonder if FCC needs to look again at this requirement.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
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On 2019-02-21 20:48, Jim Hulbert wrote:
Equipment that is covered under FCC Rules Part 15, but which is too large to
test on an open area test site, can alternatively been tested in situ.
However, the rules state that the test should be performed at 3 different
representative installations of the equipment. Does anyone on this forum have
experience doing this? I would expect conducted emissions to be reasonably
similar, but I can see how environmental influences could result in 3 different
sets of radiated emissions data. How do you make sense of the data?
Jim Hulbert
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