Forwarded to the list for the originator. Please respond off-list
directly to the originator.
Scott Douglas
EMC-PSTC List Admin.
To All,
We have a piece of Pre-Owned HALT equipment for Sale. A QRS 600V
Quasi-Random Vibration and Temperature System which produces Broadband
Simultaneous
Brian,
416 volts is the phase to phase voltage of a 240/416 v three phase
distribution circuit. If you had a circuit with a heavy single phase load from
phase A to neutral and a light single phase load from phase B to neutral and
then opened the neutral, they would be in series with the phase
Sir
Interesting requiremensts. What is the basis of 416V ?
Thanks,
yet another Brian
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Robert
Johnson
Sent: Wednesday, November 08, 2006 2:01 PM
To: emc-p...@ieee.org
Subject: Re: Worst Case AC Power Conditions
It's also useful to
It's also useful to know what your product does under non operating
conditions. A common fault is open neutral and can happen anywhere from the
power cord to across town. This leaves your equipment in series with other
unknown loads from phase to phase.
This is not something you should expect to
In message 006b01c70358$24511f10$150bb...@colorado.linear.com, dated
Wed, 8 Nov 2006, David Cuthbert dcuthb...@linear.com writes
I can see using a PLL with a long time constant to obtain immunity from
line noise. But If the line zero crossing shifts abruptly the SCR fires
to one side of zero
In message
0ed66cd2c9bd0a459d54fb9119a605672a2...@mailserver.lecotc.com, dated
Wed, 8 Nov 2006, Kunde, Brian brian_ku...@lecotc.com writes
As you can image, such methods would be susceptible to AC line noise,
harmonics, dips, etc.. So we design immunity to such noise into our
products, but
Ted
When, many years ago, I organised compliance testing at one of the HP UK
sites, I used the same range (although I did use 270V = 250V +10%, at the
top end) you mention below - and for the same reasons!
Similarly I used to test some equipment from 90V-135V in the days before
full-range
I can see using a PLL with a long time constant to obtain immunity from line
noise. But If the line zero crossing shifts abruptly the SCR fires to one
side of zero crossing. An expensive solution is to run your equipment off of
a power conditioner that performs the AC-DC-AC function. Pretty
Ted,
Thanks for the reply.
The voltage range is not our problem. We do design for the 180-264
voltage range. As I explained in another email reply, our problem is
being able to monitor the AC line to know when to fire a furnace control
relay. Noise, harmonic distortion and other line conditions
Dave,
Thanks for the reply.
I should have explained further. Our equipment is designed to work only
in the 230V nominal voltage range at both 50 and 60 hz. Our equipment
has furnaces that we must regulate the temperature within a very tight
spec. To do this we must fire control relays (SSRs)
Hello Brian,
180 - 264 V may be a better range to use for voltage.
Japan uses 200 V and you will want to be able to run at a 10% undervoltage.
The Japanese are more particular about controlling voltage than most
countries, so -10% should be acceptable. 180 V will test to -13.4% for the
North
Brian,
When I worked for a well-known instrumentation company our universal power
line requirement was, if I remember correctly, 80 to 270 VAC. If one could
achieve more it was good. I designed one that would reliably operate from 75
to 280 VAC. This covered 100 V Japan on up with margin. Our
Hello!
3. Can anyone recommend an AC Power Line analyzer that we can just
plug-in and it will analyze the AC power conditions at different
customer locations? Then we could take the results and program our
5000ix
power supply to simulate those conditions in our lab.
We have a Fluke 434
.shtml.
A comparison table is attached to this Notice, which can be found at:
http://www.cnca.gov.cn/cnca/zwxx/ggxx/images/20061108/622.doc
http://www.cnca.gov.cn/cnca/zwxx/ggxx/images/20061108/622.doc.
The first column of the comparison table lists the implementation rule
applied. The second
Ted,
Thank you for your reply.
We sell products worldwide to operate in the 200-260 (230V Norm) voltage
range. The information I seek includes help in determining where to draw
the line between real world power line conditions that a product should
work properly in and the conditions in which
Good Morning!
My Metrology guy is looking for some equipment. Aside from eBay, does anyone
have any leads on:
1. Druck 515 Dual Channel Pressure Controller
2. Tenny TUJR Environmental Chamber
or equivalents?
Thanks in advance,
Ed Price
mailto:ed.pr...@cubic.com
I want to commend you for an excellent name...
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Kunde,
Brian
Sent: Wednesday, November 08, 2006 6:15 AM
To: emc-p...@ieee.org
Subject: Worst Case AC Power Conditions
Greetings,
1. Can anyone
Hello Brian,
Can you provide a little more information for your first question? Into
what regions will you sell your product? Worst-case conditions will vary
significantly from one part of the world to another. Frequency is very
stable in Western Europe and North America, but it can vary
Greetings,
1. Can anyone provide specifications for a worst case real world AC
power line condition in which an apparatus is expected to operate
properly in (pass/criteria A)? This would encompass a combination of
harmonics, voltage variations, frequency variations, etc..
2. Also, if anyone
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