Hello EMC-PSTC,
It's been a long time since I have been in this community. So, hello all.
Please respond with any test labs in and around the SF Bay Area with what there
specialities are. I do not have a current list and would like to include the
big name brands and the smaller independents a
Not wanting to sound like too much of a dinosaur, but back in the 1960's and
early 70's, emission data was acquired by slowly tuning a receiver across
the frequency range while listening to headphones and watching a meter. You
would record the frequency and amplitude at several frequencies per octa
Ralph:
That's a workable explanation for the variation from flatness. Those who
spend a lot of their time acquiring emission data get very accustomed to the
shape of the corrected noise floor, and any variation from expected is a
reason to stop the test and examine everything that is going on i
I am just now gotten very interest on this subject. I think you mention a key
factor: antenna factor. The SA noise floor unit is dBm. After you have added
the antenna factor the unit is dBuV/m. Everything else being perfect, zero
loss, 0 dBi antenna gain across frequency, etc., the antanna facto
Generally pretty correct Ralph. The only "picky" point I would have is
about #2. The pre-amp really doesn't lower the noise floor created by #1.
It raises the signal level further above it.
Best of luck,
Brent DeWitt
Bose Corporation
Framingham, MA
From: McDiarmid, Ralph [mailto:ral
I agree. A modern machine adjusts the raw data or noise floor for any and
all transducer/amplifier/attenuator factors, and if the transducer factor is
not flat, neither will be the adjusted noise floor.
The only reason we do things this way is an ³embarrassment of riches² in
processing power. Ab
I would like to explain to a colleague why the noise floor on a SA does
not look flat as it sweeps across a given frequency range after antenna
factors, cable factors, external gain and external attenuation are
programmed into its display function.
I think it breaks down to these fundamental p
The adjective ancillary is intended to mean auxiliary or subordinate.
An EPS or battery can be considered as non-effective 'ancillary' equipment only
where the selection of various models or sources do not affect the outcome of
the EMC or safety reports.
Brian
From: McDiarmid, Ralph [mailto:
If it helps, the Oxford Concise English dictionary defines "ancillary" as:
"a person, activity, or service providing essential support"
Since the AC/DC adapter is essential to the function of the device, it
provides more than merely "essential support"
It is by all means an inseparable part of
All,
I know this is not an electrical question but it is safety related to a UL
standard. Hopefully there is someone here who has experience.
UL 1275 Standard for Flammable Liquid Storage Cabinets speaks to
three-point self-latching doors, 18 AWG steel and other construction
constraints. Howe
Hi David:
The above is due to disagreement with customer.
Apparently, the customer wants testing and
certification, so give it to him! (The customer
is always right!)
Best regards,
Rich
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This mes
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