I've seen that design in a D-dot sensor. The elements were a couple of
spheres. The output impedance of such an antenna is quite high, it really
is an electric field probe, and works at frequencies where the elements are
electrically short. These types of devices really sense the time
Amund -
Since A11 addressed issues related to LED optical power
evaluations, it's added requirements would not necessarily
apply to a power supply. Note that A4 has the same date of
suprecession of previous standards as A11. You could easily
make the case that A4 is good enough.
My
Hello Sam,
I believe that IEC 60335-1 has the information you are looking for.
Best regards,
Ron Wellman
At 02:14 PM 10/29/2003 -0700, POWELL, DOUG wrote:
Sam,
IEC 60950 (EN 60950) has:
Table 3D - Range of conductor sizes to be accepted by terminals
Table 3E - Sizes of terminals for mains
Just to be clear on this one, Agilent do not support the instrument any
longer, however, we must remember it is quite old at this stage.
They have told me that they will not guarantee to repair as some of the spares
could be obsolete it but would look at it for me.
John Cronin
_
Thanks, Gary, for catching my goof – Note 2 should say “German language”
not “English language”.
Sorry folks!
Doug Massey
Product Safety Engineer
Advanced Compliance Solutions
Ph. (770) 831-8048
FAX (770) 831-8598
Visit our web home at http://www.acstestlab.com
Sam,
IEC 60950 (EN 60950) has:
Table 3D - Range of conductor sizes to be accepted by terminals
Table 3E - Sizes of terminals for mains supply conductors and protective
earthing conductors
-doug
Douglas E. Powell
Corporate Compliance Dept.
Advanced Energy Industries, Inc.
Fort Collins, CO
Mr Lai
You make a very important point about not depending on a device for ground
continuity that is designed only for EMI suppression.
But if the power supply is failing hi-pot, the unit has a serious spacing
and/or materials issue. Many power supply mfrs perform Type Tests at higher
test
I think the length of a 1/2 wave dipole in feet is basically 468/f(MHz)
where the ratio of the length to diameter is very large (wire antennas in
the HF region, for example). Making the diameter of the elements larger does
two things: it reduces the overall length of the antenna and increases the
Hi all,
We are looking for an adapter 240AC/24DC 60W.
During our search we have been given a CB look-a-like sheet from a
manufacturer. I mean, it is not the usual CB certificate sheet I used to
see. It refers to IEC60950:1991 with A1 , A2, A3 and A4.
Question:
Shouldn't A11 also be included ?
Thanks to you all who responded.
Since we have EU and North America as main targets, we will start up with
English, German, French and Spanish.
Best regards
Amund Westin
Oslo / NORWAY
-Opprinnelig melding-
Fra: owner-emc-p...@majordomo.ieee.org
I read in !emc-pstc that Sam Davis sda...@ptitest.com wrote (in
ncbbjfmlmlpnhhmlgfdfcemdfcab.sda...@ptitest.com) about 'European
conductor ampacity table' on Wed, 29 Oct 2003:
Can anyone point me to a source of the European ratings for conductor
size vs ampere rating? I've got tons of hits for
From Dave Cuthbert's comments to me regarding a 1/4
wavelength dipole; he said that the current moves down the
rod as the rod becomes thicker, which implies that the
current distribution absolutely determines the effective
length. Was that effective length or tuned length? hmm
However, the
Hello Raymond,
First I don't think the EMC earthing plate should be treat as reliable
earthing. (require good ground continuity as welll as mechanical secure)
What I will do are
1. use double insulating Bridging cap, like Y1 cap (for example Panasonic NS-A)
2. find a way to prevent the break
And also the circumference of the element. And, Yes, wave velocity is
certainly different in mediums other than vaccum affected by permeability
and permitivity.
Engineering Manager
BACL
230 Commercial Street
Sunnyvale CA 94085 USA
408-732-9162 x38
408-732-9164 fax
- Original Message -
HP did drop support for much EMC related equipment. Harmonics and Flicker test
equipment for certain.
Jon Francis
From: Reginald Henry [mailto:rhe...@vicon-cctv.com]
Sent: 29 October, 2003 3:20 PM
To: 'John Cronin'; emc-p...@majordomo.ieee.org
Subject: RE: Repair of HP8562A Spectrum Analyzer
Ilan, Note that the socket outlets in most of Europe and unpolarized, meaning
they are connected in random. UK and Switzerland are the exceptions.
Therefore there is no reason for the CEE 7, SS VII plug to identify polarity.
Somewhere in the standards you will find a clause that requires two
This is a multi-part message in MIME format.
Take for example a power supply with a transformer and a few components in the
path (Inlet, filters...) protected by a fuse of about 3A. Building
installation is typically 10A minimum. You may end with faults from Line to
Ground that will stress
Ilan
Actually I have to disagree with you that it is not handled correctly by
60950, 60335 etc.
If you examine the tabulated requirements for fusing in the standard (and in
some others) you will see under which combinations of circumstances you need 1
fuse or two fuses (on a single-phase
John,
I have used Avalon for my HP repairs. Agilent may not have the parts,
especially if your Analyzer falls under EMC equipment.
Josh
From: John Cronin [mailto:croni...@hotmail.com]
Sent: Wednesday, October 29, 2003 5:41 AM
To: emc-p...@majordomo.ieee.org
Subject: ***SPAM*** 8.8 Repair of
John:
You might also contact Agilent concerning support of this instrument, at
http://www.agilent.com. They were once the test and measurement division of
HP. I never worked for them so I have no further details or insider
knowledge.
regards,
Richard Schumacher
Hewlett Packard Company
Hi David,
Yesterday I was able to download entire rule parts at this url:
http://www.gpo.gov/ecfr/
The rules are updated daily on this site so you have the most current versions.
Today the site seems to have connection problems, but as I remember the
process you
- pick Title 47 from the pull
Ilan, EN60950 requires both overload and earth fault protection. Pluggable
products may rely upon the building protection (mains fuses, breakers) to
provide line to earth fault protection. If so, a single internal fuse or
breaker can protect against overload. Such construction is allowed and is
John,
I think that is an easy one !
Agilent 800-452-4844
Agilent has taken on that area for ALL HP test equipment.
http://www.agilent.com
I believe
Reg
From: John Cronin [mailto:croni...@hotmail.com]
Sent: Wednesday, October 29, 2003 8:41 AM
To:
Hi
I have a HP 8562A 22 GHz spectrum analyzer with a blown input stage. HP no
longer support this instrument. Can anyone advise of a suitable source of
third party repair?
Many Thanks
John Cronin
_
Get your hands on designer bargains for less - click here.
Dear Group
I have been looking into the usage of the Continental European Plug also known
as Schuko CEE7 plug (earthed plug). It can be inserted into the Wall socket
without a way to ensure that line is connected to line and Neutral to Neutral.
http://www.interpower.com/scripts/wsisa
I assume you are referring to the fact that the length of a practical antenna
is about 95% of the theoretical length.
One significant influence is the end capacitance of a thick dipole,
effectively caused by the electric field fringing from the sides of the
element round to the end.
Hope this
Dear all
I got confused with the effective length of a half wave dipole.
1) It is due to non-constant current distribution, or
2) It is due to the wave velocity in materials different from that in
vacuum.
What do you think which one is correct?
Regards
KC Chan
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