Folks,
I have a question regarding DFS testing for our RF experts.
We manufacture point to point wirless devices.
One NRTL lab told us that we need to test only one band 5.3GHz while the other
NRTL lab asked us to test both bands i.e. 5.6GHz and 5.3GHz band?
Question? Can we j
Jim et al,
I have been following this with a certain fascination.
Willful ignorance -- choosing to ignore a fact one knew or should have known
-- is far from being a defense when questioned on compliance matters. Would
the choice not to test for combined leakage current in a medical device ren
Greetings,
> an NABL accredited lab’s results would be accepted by the FCC.
Not necessarily.
One way to confirm will be to review the FCC letter for the registration of
the measurement facility to 47 CFR Section 2.948.
Lately I’ve been seeing in some of these letters from the FCC:
Hi Jim,
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Than
Hi Michael,
This question was posted on Interference Technology’s Testing Forum, and
received a reply. To view the reply, please visit the link below.
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Dave Wilson writes:
I need to determine what power rating a resistor has to be to adequately
dissipate 0.5J (a 1.2/50us surge of 500V from a 500 ohm source). Anyone have a
conversion formula?
Hi Dave:
I'm a little late responding and I see that you have already received so
Mick, Mike et al,
I recommend resistors from HVR. They have “non-inductive” resistors and
will help you decide what you need based on joule ratings instead of wattage
ratings. Sometimes they have some stuff in stock and they can let you know.
Often I end up putting
All,
Our lab is currently looking at purchasing a 30 kV gun for our EMC lab.
We are evaluating Haefely and HVT guns.
Haefely PESD 3010 has a power module and the gun connects to that
VS
HVT ESD 3000 uses rechargeable 10 AA batteries.
Comments are welcome offline (cause we are d
Mick, Mike et al,
I recommend resistors from HVR. They have “non-inductive” resistors and
will help you decide what you need based on joule ratings instead of wattage
ratings. Sometimes they have some stuff in stock and they can let you know.
Often I end up putting their resistors in paralle
In message
<690230e9cf51aa4ebf639fae9216d5b166e...@mer2-exchrec1.echostar.com>,
dated Thu, 29 Oct 2009, "Grasso, Charles"
writes:
>There IS a difference between the two scenarios that you lay out John.
>On the one hand you (or your company) assembles a number of products
>into a rack for a s
I need to determine what power rating a resistor has to be to adequately
dissipate 0.5J (a 1.2/50us surge of 500V from a 500 ohm source). Anyone have a
conversion formula?
Like Mike I'm puzzled by 0.5 J number as well.
The Exponential Impulse waveforms Annex of the A
Hi Charles
I would agree with your reasoning, but experience indicates that your leading
statement below is the correct one.
We know of a laboratory in Malaysia that is 17025 accredited for Part 15 tests
by A2LA.
We were surprised to find out that since Malaysia has no MRA with the US, that
There IS a difference between the two scenarios that you
lay out John. On the one hand you (or your company) assembles
a number of products into a rack for a specific function and that
function is internal.
On the other hand you have a manufacturer who decides (with the exact
same set of product
Dave -- How did you come up with the 0.5J number ? The energy to be dissipated
in a load resistor is going to depend on the resistor value, generator source
impedance, stored voltage and the size of the energy storage cap – and even
then it’s difficult.
If you have a 500 ohm source and 500 ohm
Thank you to all of you who replied.
I am in a position of reviewing test reports for a DoC product designed and
tested
in India. So with no MRA I suppose the DoC could be invalid.
I have asked the lab for their accreditations and I am told that they are NABL
accredited.
It turns out th
It depend very much of the heat properties of the resistor.
I would go for a large resistor, with lots of
thermal buffer.
The power rating would be 500 W x 50E-6 = 2.5 mW as that
is the total power per second (assuming < 1 pulse /sec).
(= continuous power x pulse width) which is way less
then any
Dave your question is bit of apples and oranges. You really need the resistor
that will sustain your pulse. You are mixing power and energy. Energy = Power
x time i.e.( watt hour = watts x time).
You are correct that resistors are rated in watts but there are other
characteristics, such as induc
The problem maybe that you are exceeding your maximum number of pulses per
second.
I have a PEFT Junior and the Max is 600.
So my Spike_Freq X Burst_Duration X Burst_Freq must be less than or equal to
600 impulses per second otherwise I get a ‘Frequency Too High” error.
The Other Brian
Umm, what is the resistor value?
Ken Javor
Phone: (256) 650-5261
From: Dave Wilson
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Thu, 29 Oct 2009 09:58:35 -0700 (PDT)
To: IEEE EMC-PSTC
In message
<0ed66cd2c9bd0a459d54fb9119a60567011b7...@mailserver.lecotc.com>, dated
Thu, 29 Oct 2009, "Kunde, Brian" writes:
>Simple question, where does the 1V/m, 3V/m and 10V/m test levels come
>from in the Radiated Immunity standards such as IEC/EN61000-4-3? Is
>there some real-world rf so
In message <541403.70322...@web52201.mail.re2.yahoo.com>, dated Thu, 29
Oct 2009, Dave Wilson writes:
>
>I need to determine what power rating a resistor has to be to
>adequately dissipate 0.5J (a 1.2/50us surge of 500V from a 500 ohm
>source). Anyone have a conversion formula?
It's not a ma
Simple question, where does the 1V/m, 3V/m and 10V/m test levels come from in
the Radiated Immunity standards such as IEC/EN61000-4-3? Is there some
real-world rf source that correlates to these levels?
Thanks for the history lesson.
The Other Brian
_
LECO Cor
In message <006401ca58b8$1b179ec0$5146dc40$@com>, dated Thu, 29 Oct
2009, Dennis Ward writes:
>However, if a company has this great little idea of selling the same 5
>PCs and 5 cell phones devices connected all together in a 'rack', it is
>extremely naïve of them to think that just because one
All,
I am attempting to modify an existing program
that I am using for the EFT/B testing using the Haefely PHV 41.2 Unit 4Kv
I wish to increase the frequency for an investigation testing.
But I keep on getting error message on the display
"frequency too high"
I wish to change it to 4KHz
If
Hi,
I need to determine what power rating a resistor has to be to adequately
dissipate 0.5J (a 1.2/50us surge of 500V from a 500 ohm source). Anyone have a
conversion formula?
Thanks in advance,
Dave
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list.
I believe I would have to agree with Gert. Too often some tend to look only at
what is 'legal' and forget what is their responsibility. For example, if I
were ignorant of EMC and in my own home put 5 identical PCs and 5 identical
cell phone devices on a table or in a rack I might 'assume' that
Be aware though that some India EMC standards for telecom (CTI is one example)
are based on EN300386 and not CISPR 22/24, so a report to the CISPR standards
will be incomplete and not adequate.
Dan
From: peter merguerian [mailto:pmerguerian2...@yahoo.com]
Sent: Thursday, October 29, 2009 9
They have no MRA but if this is telecom related, TEC should accept your US
accredited laboratory emc test reports. Telecom tests are done in-country
Peter
--- On Wed, 10/28/09, Grasso, Charles wrote:
From: Grasso, Charles
Subject: India_US MRA for EMC?
To: EMC-PSTC@L
I think that protection objective is the right keyword here.
If you (re)sell equipment consisting of individual modules put together in one
product,
you (the company) has to prove that the protection objective was reached by
performing
a couple of measurements and tests with the product (plus qual
In message ,
"ce-test, qualified testing bv - Gert Gremmen"
writes
>
>If you (John) as a private person will do that, there is no problem,
>buy a rack or cupboard from Ikea: it's the same.
>
>But if you ask a company to assemble such as
>system (custom made) and sells it to you (independent of
Hi John
Would it make any difference if the units were not identical?
Is there any Euro document that I can quote that explains this.
Regards
Andy
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: 28 October 2009 20:28
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: certifying overall pr
Addendum to my earlier post.
This grouping of equipment topic is the kind of grey area
that is difficult to fit into regulations.
That is exactly why the EC opted for the system of essential requirements
and not for the "Technical Standards = Law " system. In any
of such strict regulations there i
It doesn't matter if I agree, as it's technically not true.
The EMC behavior will NOT be the same
and in case of 4 identical equipments, having an emission
spectrum close to the limit, the result will exceed the limits.
If you (John) as a private person will do that, there is
no problem, buy a rac
In message , dated Wed, 28 Oct 2009,
John Woodgate writes:
>>The EU - for quite a while - has had the opinion that CE+CE does NOT =
>>CE (necessarily).
>>
>>This is a very perplexing question!
>
>No, it isn't. The principles were established LONG ago: they just
>haven't penetrated, a situation
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