tfskx...@leco.com, brian_ku...@leco.com inimitably wrote:
When troubleshooting surge problems on products we often see the surge pulse
to
be much higher after the line filter (testing the AC Mains with Line-Earth
surge
pulses according to EN61000-4-5).
Can someone explain the science behind
Brian,
Seeing higher surge voltages after the mains filter may be due to
resonance and the Q of the circuit. In short, the filter might be
creating a tuned circuit for the frequencies containted in the surge
waveform. Keep in mind that the surge itself could
Can anyone give me a completive advantage reason for using BT Labs
versus the multitude of other compliance marks. I don't recall ever having a
problem or even a stated preference for them, but got a new sales guys
insisting we have to do it, and at the moment I have no burning desire to
Hi,
Try Dayton T. Brown in NY, they do RR gear.
R. Thomas Egelandsdal, Sales Engineer
phone: 613-244-6237
tegelands...@daytonbrown.com
fax: 631-589-3648
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion
My company designs and manufactures visual systems for use in simulation and
training. Aside from the computers, projectors and other electronic devices
used with these systems (which are CE marked), we also deliver these visual
systems with some type of visual environment such as a dome. This
Could someone provide me with a contact within the FCC (or any other
authorized agencies) that deals with FCC rules applicable to railroad devices
(locomotive and wayside)?
Thanks in advance,
Susan H. Beard
321-435-7762 Fax 321-435-7957
susan.be...@gehh.ge.com
Hi John,
I haven't seen it on any agency websites in soft form but I have seen a
cross referencing index in print about a year ago. If you have a contact at
one of the agencies you might be able to get a copy.
If any agency participants on this forum have the go-ahead to share such an
index,
The Product Safety standards for ITE are generally based on the single fault
rule. That is, the device can withstand a single fault and still be safe. If a
Class I
(earth grounded design) device loses its earth ground path, for whatever reason,
internal or external, this is a single fault,
Hi John - check out http://www.ul.com/ite/60950Analysis_05_07_01.PDF for
UL's Certification Impact Analysis of the new standard.
Doug Massey
LXE, Inc.
-Original Message-
From: Allen, John [mailto:john.al...@uk.thalesgroup.com]
Sent: Thursday, May 31, 2001 6:12 AM
To: 'EMC-PSTC'
Martin,
I agree with Peter about designing even Class I (grounded) power supplies with
Class II (double-insulated) internal construction. Our Product Safety folks
require this, and have required it going back to our IBM Lexington days. The
grounding of wall outlets can not be trusted in many
I can comment on the CM series cables. They are specified in the National
Electrical Code for Communications applications. CM is the general
construction, but has limits as to where it can be used in the building. CMR
is designed for use inside walls (R = Risers) and CMP is designed for use in
Francois,
I have previously tested to the European standard for wheelchairs, EN12184, the
emissions section in this was the same as en55022, unfortunately I can not
remember which class, but the emissions coming of the chairs was not that high
and normally below the limits. It was normally
5ba039bec9de14488076e22675ba91fb307...@hq7.pcmail.ingr.com, Griffith,
Monty J mjgri...@ingr.com inimitably wrote:
Does anyone know what the vibration requirements for this standard are?
(Sine,half Sine, triangle, frequency and amplitude, how many G's the
equipment must withstand) I also saw
Hi,
1) UL approved communication/computer/data cables marked with UL Style
(style 2464, style 2919, Style 2990).
- Where can I find more information about each cable style (I tried the UL
Web Site)?
- Does cable style specify cable impedance?
2) Short explanation of cable types CM, CMR,
Hi Folks
The requirements of the various clauses have been re-arranged between these
two editions, so does anyone know of any guides or cross-references as to
how the requirements have actually moved around?
Thanks in advance.
John Allen
Thales Defence Communications Division
Bracknell
UK
Does anyone know what the vibration requirements for this standard are?
(Sine,half Sine, triangle, frequency and amplitude, how many G's the
equipment must withstand) I also saw where it was equal to MIL-STD-1399, is
that true? Any help would be appreciated. Thanks!!!
Monty Griffith
Test
Martin,
The best design method in case of a mains ground failure is to design your
equipment to meet double or reinforced insulation throughout. That means
your equipment will still be considered a Class I product but you have
designed it to meet the more stringent requirements for double or
of08958f39.0dda511c-on88256a5c.007a1...@pe-c.com,
marti...@appliedbiosystems.com inimitably wrote:
In order to avoid test failures during a single fault condition where the
primary ground is removed, what design methods can be used to add a second
ground to the system so that a ground is still
Paolo:
I wonder if you could suffer a little line loss and match the balun with a
resistive minimum loss pad and use 50 ohm connecotrs?. That way you could
minimiz reflections and possiby improve EMC?
My two sents worth.
Ralph Cameron EMC Culting and Suppression of Consumer Electronics
(After
Test folks-
Anyone out there have a Wiltron 9361B signaling test set? Does the manual
include calibration instructions? We have a unit with no manual, and wonder
if it's worth having it calibrated. It comes in handy when doing dial-pulse
compatibility testing. Thanks
Dwight
20 matches
Mail list logo
