April Meeting Notice, Santa Clara Valley IEEE EMC Society
When
April 13, 1999
Where
-
Dinner 5:30 - 7:30 PM
Auspex Cafeteria, 2300 Central Expressway, Buliding A, Santa Clara
Technical Presentation 7:30 - 9:30 PM
Auspex, 2300 Central Expressway, Building A, Santa Clara, CA
Topic
At the end of last year Chinese authorities announced their
intent to impose EMC requirements on certain import commodities under
the existing CCIB/CCEE safety requirements. Does any body know the
status ?
Thanks to all.
Tom Cokenias
Consultant, EMC and Radio Approvals
-
This
February Meeting Notice, Santa Clara Valley IEEE EMC Society
When
February 9, 1999
Where
-
Dinner 5:30 - 7:30 PM
Auspex Cafeteria, 2300 Central Expressway, Buliding A, Santa Clara
Technical Presentation 7:30 - 9:30 PM
Auspex, 2300 Central Expressway, Building A, Santa Clara, CA
Subject: Spread Spectrum Clock Techniques talk in Santa Clara CA
The Santa Clara Valley IEEE EMC chapter is presenting on Tuesday Evening,
12 Jan, a talk on Spread Spectrum Clock Techniques by Don Bush of dBi
Corp. Please visit our website for details:
www.scvemc.org
The dinner (5:30) and later
On December 17 FCC took another big step towards getting itself out of the
telecommunications equipment approval business, in order to allocate
resources to enforcement of its regulations. Docket 98-68 covers both
wired and wireless telecom equipment de-regulation issues, an Adobe Acrobat
file
At 4:22 PM -0500 12/18/98, Doug Frazee wrote:
I would like to compile thoughts and techniques that members of this group
use to perform in situ tests on large industrial apparatus.
The basic protection requirements of the EMC directive state in effect that
the apparatus shall not cause undue
Hi everyone,
Just a reminder that the SCV IEEE EMC Society Meeting will be held 8
December - dinner and technical presentation both at Auspex. Menu choices
will include prime rib dinner, vegetarian tortellini, and some traditional
holiday dishes. The Product Safety Society will be meeting
Peter,
After first making sure the RES BW and VIDEO BW are 9-10 kHz throughout the
range (more than once the BW on my analyzer has been higher than what I set
it to because I increased sweep or span and had BW in the AUTO setting),
you might consider the following:
Look for broken cables in the
Peter,
After first making sure the RES BW and VIDEO BW are 9-10 kHz throughout the
range (more than once the BW on my analyzer has been higher than what I set
it to because I increased sweep or span and had BW in the AUTO setting),
you might consider the following:
Look for broken cables in the
Richard,
Re the ferrites during NSA measurements (and others): I was under the
impression that the ferrites prevented the shield of the vertically hanging
cable from becoming an additional (and unwanted) reflector element.In
making some NSA measurements I found adding ferrites to the hanging
November Santa Clara Valley Chapter IEEE EMC Society Meeting Notice
When
November 10, 1998
Where
-
Cocktails (5:00 PM) and Dinner (5:30 PM)
El Torito's Restaurant, 2950 Lakeside Drive, Santa Clara, CA
Technical Presentation
Auspex, 2300 Central Expressway, Santa Clara, CA 7:30 PM -
When: 13 October 1998
Dinner/Social
El Torito's Restaurant
2950 Lakeside Drive, Santa Clara, CA
COCKTAILS: 5:00PM DINNER: 5:30PM
PRESENTATION: 7:30
Auspex, 2800 Scott Blvd, Building A, Santa Clara, CA
Topic/Speaker
Radiated and Injected Tests-When are they equivalent? Dr. Jose
Perini, IEEE
Muriel,
It depends on how you are subtracting.
When measuring with EUT on, you are looking at ambient + EUT signal - in a
logarithmic representation when using the analyzer log scale. Since
subtracting logs is equivalent to dividing numbers, you have to be
careful.
A worst-case scenario is
Neil,
Unless your customer is a public utility or the US govt (see Rule paragraph
2.807, Statutory Exceptions), it looks like you will need to pursue Part 15
certification for your wireless modem - unless it has been certified
previously; you may be able to ride your product as a permissive
Jeff,
Testing AC lines will prove whether your card can withstand whatever EFT
can pass through the power supply filtering, but just as important,EFT is
as much a radiated immunity test as it is a conducted test. Often I/O
cables and others act as pickup antennas, and you should consider the
Jack,
From you message it seems you are more interested in determining what
levels of RF conducted emissions appear at your radio DC terminals - that
way, if your emissions are below FCC 15 and EN55022 AC line conducted
standards, you can make the argument that your product will not adversely
Jack,
DC line conducted requirements exist for aircraft, MIL-STD, Bellcore, and
some ETSI specifications, and each standard specifies the test set-up and
equipment used.
From you message it seems you are not so much testing to one of these
specs, you are more interested in determining what
Richard,
You did not say what type of testing you would be doing, but in general you
can run low power ITE equipment indefinitely with solid state power
converters of the type you mention - most equipment rental companies have
them, some brands I have rented Elgar, California Instruments, Pacific
Richard,
You did not say what type of testing you would be doing, but in general you
can run low power ITE equipment indefinitely with solid state power
converters of the type you mention - most equipment rental companies have
them, some brands I have rented Elgar, California Instruments, Pacific
Gary,
TCF format is not specified in the Directive but you should make sure yours
contains the information required therein, and that it is in a format that
your competent body finds acceptable, since they will be doing the
assessment.
best regards
Tom Cokenias
EMC Consultant
650-726-1262
Pat,
Try Fischer Custom Communications Inc - I think he makes his own absorbing
clamp tel 310-891-0635 fax 310-891-0644 Ask for Alan or Fred Fischer
Maybe Solar Electronics as well in North Hollywood CA - 800-952-5302, ask
for Roy Talley
Best regards
Tom Cokenias
EMC Radio Type Approvals
Scot,
We had a problem at our lab that sounds very similar to yours. It turned
out to be dirty power line insulators. We were in the midst of a drought
at the time and the rains were not doing a good job cleaning the
insulators. The dirt built up to the point that there was conduction
through
Mike,
If you don't draw a spark during ESD air discharge, and you have no
surfaces to which a direct contact discharge can be injected, you won't
create the E-field that is disruptive to high bandwidth transceiver systems
nor will there be a conducted current spike to cause problems.
Plastic
Pat,
The times I had the analyzer jump to 1 Hz were when I had the 0 (zero) Hz
trace on the screen along with my signal to be measured and I had pushed
the PEAK SEARCH or MKR- function. Sometimes one can have the zero Hz
trace right on the far left vertical graticule of the display and not
The DoC procedure was implemented to speed class B computers and their
peripherals to market. The DoC is a self-certification procedure, i.e.,
no submission of data or fees to FCC, as was required in almost all cases
for class B home computer/peripheral equipment prior to DoC rules.
Class A
Moshe,
The competent bodies I have dealt with (3) have required ESD testing to
metal shells of D connectors and have specifically excluded requirements to
test the pins. The rationale has been that the mfr put the connector for a
cable to connect to it, meaning the pins will be somewhat
Does anybody know of any specifications or standards re intrinsic safety of
low power (FCC Part 15) 125 kHz magnetic field transmitters? These TX's
are usually employed to read tags or cards for door entry, security, etc.
Thanks,
Tom Cokenias
RFI/EMC Consultant
Palo Alto, CA
ph 415-493-4219
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