Good People
I speak only for myself, and perhaps for my dog, but definitely not for my
cat or employer...
It is difficult for a component SMPS mfr to say that the outputs will stay
within specified tolerance *DURING* these tests; because we cannot control
the ultimate end-use installation.
Did any of you see the following article in
Interference Technology?
http://www.rmit.edu.au/browse;ID=ue9soxm9ujv2
- Robert -
-
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list.Website: http://www.ieee-pses.org/
To post a message to the
Hi All,
I have just posted a new 6 minute podcast on using inexpensive test
equipment from the Amateur Radio field in the development/engineering
lab. Got a tight equipment budget? Some of the equipment is very
useful and a very low cost. I cover four specific pieces of equipment
and uses
This was one of the reasons we designed and built our own analogue transistors
load banks. The ones available on the market are often noisy and not suitable
for EMC emissions measurements. At least, that's been my experience.
A resistor bank has the advantage of simplicity, but the
Hi David,
A couple of possibilities:
- You have an increase in RF currents flowing from the power supply, through
the electronic load, to it's power source (regardless whether the electronic
load is grounded). Note: EN55022:1998, clause 9.2.e says that other power
cords from the system (in
I suggest that if one is interested only in the emissions from the EUT, then a
stack of resistors is the easiest way to build a suitable load.
If one is interested in functional interaction between power supply and an
active load (perhaps DC-DC converter) then okay, but how would you distinguish
Hi group,
Does anyone know of test facilities in or around Poland for vibration
and shock testing of equipment with a weight of 300-500kg?
Specs are ETS300019-2-2 Class 2.3 Public transportation
(IEC60068-2-29 IEC60068-2-64)
Best regards,
Kris Carpentier
Regulatory Approvals
-
This message
Agree with ED, the las time I used and electronic load it was terrible noisey
in-and-of-itself. Too noisey for emissions tests. As lab equipment – at the
time – it didn’t hgave any FCC emissions testing – and so I doubt it
addressed this area at all. Maybe better these days but I would be
Good People,
Conflict of Interest Notice: my employer makes component SMPS.
The control loop for an analog load can also cause problems if the loop
response time beats against a fundamental of the SMPS for that particular
load setting.
That is why my employer has a requirement to sweep the
-Original Message-
From: David Gelfand [mailto:david.gelf...@mitectelecom.com]
Sent: Thursday, May 18, 2006 8:09 AM
To: emc-p...@ieee.org
Subject: Conducted emission measurements
We measured conducted emissions of a switched mode ac-dc
power supply and found that emissions
We have discovered that some commercially available electronic loads
have conducted emissions of their own and these currents find there way
into the device-under-test.
Consider using either resistive load or an analogue controlled
transistor load bank. (no switching circuits or oscillators
We measured conducted emissions of a switched mode ac-dc power supply
and found that emissions are much higher when using an electronic load
compared to a resistive load. Can somebody explain why this is?
Thanks,
David.
David Gelfand, P.E.
Product Integrity Engineer
Mitec Telecom Inc
9000
Ian,
I know of one PS manufacturer who states that their power supplies
complies only with Criterion B during EFT en Surges although the output
voltage remains within the limits of the normal operating conditions
(Ex. 9V +/-5%).
The reason for this is that there may be very small pulses, nsec or
It seems to me that you would not care if only some small fraction of the
surge potential coupled from primary to secondary for a short period of time
especially if it is common mode, but that what you don't want to have happen
is a differential dc level shift. Therefore I would mount the power
In message tfsre...@leco.com, dated Thu, 18 May 2006,
brian_ku...@leco.com writes
So, we have specified that the output of power supplies must not cause
our electronics to malfunction during the 4-4 or 4-5 tests. We specify
that the DC output of a power supply can not go out of spec during
Return Receipt
Your RE: Burst and surge tests
document
:
Return Receipt
Your document:
RE: Burst and surge tests
was received by:
Jan Vercammen/AMEMV/AGFA
at:
2006-05-18 16:21:53
- This
message is from the IEEE Product Safety
Return Receipt
Your RE: Burst and surge tests
document:
Return Receipt
Your RE: Burst and surge tests
document:
In message
ofae34d781.9bc07564-on80257172.004a953d-80257172.004bb...@servomex.com,
dated Thu, 18 May 2006, iun...@servomex.com writes
I have a question regarding the likely behaviour of ac to dc switch
mode power supplies during fast transient burst tests to EN 61000-4-4
and surge tests to EN
Ian,
This is a very good question.
Not that long ago we were qualifying a power supply that would shut down and
restart each time it saw the Surge pulse during the 4-5 test. We told the PSU
manufacturer that their product fails Surge but they came back and told us
that,
according to the
Ian,
I would expect a power supply to function according to its
specifications.
This means that all output voltages have to stay within the specified
tolerance limits.
Best regards,
Michael
Michael Nagel
Senior EMC Engineer
Motorola GmbH
ECC Embedded Communications Computing
Lilienthalstrasse
Dear Group,
I have a question regarding the likely behaviour of ac to dc switch mode
power supplies during fast transient burst tests to EN 61000-4-4 and surge
tests to EN 61000-4-5.
For a manufacturer to claim conformity to these standards are any
constraints placed on the behaviour of the dc
Hi Folks
You can find information on The Harmonized Commodity Description and Coding
System (HS) of the Customs Cooperation Council (CCC) on a number of websites.
For example:http://www.uktradeinfo.com/index.cfm?task=intraicn is the relevant
part of the UK Customs and Excise Site.
Not an
Peter,
I would guess 940560. I am not really familiar with the codes you refer to.
Jody
_
From: peter merguerian [mailto:pmerguerian2...@yahoo.com]
Sent: Thursday, May 18, 2006 3:16 AM
To: Leber Jody-G19980; emc-p...@ieee.org
Subject: Re: Sign Regulations
Jody,
Do you have
Jody,
Do you have the Harmonized Tariff (HS or HTS) code? Some countries on your
list reference standards by the HS code.
Peter
Leber Jody-G19980 jody.le...@motorola.com wrote:
Ladies and Gentlemen,
We are trying to obtain regulatory approvals on a sign for retail display. It
consists
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