I wasn't going to weigh in on this one, but this last posting captured what
I had been thinking. I think the emphasis on true rms readings on a dc
supply is mistaken. I think you need to know two things. The maximum power
your boards draw because that is what what you were told to determine, an
Rick,
Another method you may want to pursue is using a multiple channel datalogger
and current shunts. The datalogger can be set to scan every second or
quicker, and can monitor multiple channels at once, so you can see the
current peaks for each voltage separately, and can show over time what t
"Crest Factor"
- is a measure of how well the True RMS meter will measure the non-sinusoidal
waveform.
- maybe compare this spec with various meters ?
From: Rich Nute [mailto:ri...@sdd.hp.com]
Sent: Monday, February 17, 2003 2:52 PM
To: rbus...@es.com
Cc: emc-p...@majordomo.ieee.org
Subject:
If the power supply voltage is "stiff", then all you need measure is the
average current. The average current times the voltage will give you the
correct average power.
If the supply voltage is not stiff, then the process is more complex. You
will need to measure the voltage and the current, mul
Hi Rick:
> On the surface it seemed like a simple exercise of putting a DC current
> meter in series with each of the outputs. Given that the current demand
> for each of these outputs is dynamic, corresponding with the processing
> activity, does it make sense to measure this output
Check out Credence Technologies:
http://www.credencetech.com
Their site source is at:
http://www.credencetech.com/ERS.htm
and it comes pre-calibrated.
I built one myself a number of years ago and the only problem with it was
frequency drift. It was very simple. It used a 74123 one shot to es
Rick,
I like to use a clamp-on DC current probe and an oscilloscope. Tektronix
makes these probes. If the 'scope has an RMS feature it will calculate the
RMS current over the length of the trace. In this way you can adjust the
length of the RMS operation. If your 'scope does not have this feature
Hello all,
I am searching for small package comb generator with amplitude calibrated
output. Any resources you can give me are much appreciated. I will even
entertain the idea of constructing one.
best regards,
-doug
Douglas E. Powell
Regulatory Compliance Engineer
Advanced Energy Industr
I have been asked by my TUV office to measure the actual output current
for each of the 5-7 voltages on my PC power supplies. The purpose of
this is to baseline the maximum output current in terms of maximum
power, not instantaneous current, for each of the various motherboards
we use.
On the sur
Hi Alice:
> Scenario : Component A with rating mentioned in the UL's product report as
> 90-135/180-265 Vac, however in the phyical unit is written as 115/230 V .
> Q1 : Is this a non conformity ? Should a VN be raised ?
Yes, this is a non-conformity.
In this case, the report should b
Also look at SEMI S20, Safety Guideline for Identification and Documentation
of Energy Isolation Devices for Hazardous Energy Control.
Best regards,
Brian Epstein
Sr Regulatory Compliance Engineer
Veeco Instruments
112 Robin Hill Rd
Santa Barbara CA 93117
805-967-2700 x2315
brian.epst...@veeco.co
>-Original Message-
>From: Wan Juang Foo [mailto:f...@np.edu.sg]
>Sent: Friday, February 14, 2003 5:47 PM
>To: emc-p...@majordomo.ieee.org
>Subject: Re: OATS Building
>
>
>
>
>Walt,
>I don't think an inflatable structure is going to be a good
>candidate to be
>a 'radome' (sp?) unless t
Dan et al
I have a Word document which I believe gives guidance on this matter. If you
would like a copy please let me know.
Ian Gordon
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Well, you will recall I didn't answer until a couple days went by and no one
else had addressed the issue. That's because I also felt there would be
people out there with more practical experience. All I said was that the
test set-up was designed with commercial products in mind that do not get
Scenario : Component A with rating mentioned in the UL's product report
as
90-135/180-265 Vac, however in the phyical unit is written as 115/230 V .
Q1 : Is this a non conformity ? Should a VN be raised ?<
Theoretically, it's a non-conformity, however if the component is being used
wit
Alice,
I have found that inspectors have allowed a manufacturer to claim more
stringent or limited ratings than what is in the UL report.
In some products that are rated at 120v from line-to-neutral, but are truly
3-phase products, it has been customary that you can denote the operating
voltage
Mr. Javor,
I guess I can't argue your points until I read your paper. Please send me a
Word copy. I assure you, I will respect the copyright and destroy the
article after I read it.
I think Mr. Betz original post needs to be answered in more thorough detail
>from a practical application of the
Hi all,
As far as I know, EN 60601-1-2 (2001) is listed on OJ since last december,
see:
http://europa.eu.int/eur-lex/it/dat/2002/c_310/c_31020021213it00040011.pdf
Best regards,
Paolo Peruzzi
**
Paolo Peruzzi
Esaote S.p.A.
Research & Product Dev
Hello Bob,
Not, yet.
You can check it below web site.
http://europa.eu.int/comm/enterprise/newapproach/standardization/harmstds/r
eflist/meddevic.html
But I think you should use new version, if available.
Best regards,
Tetsuya Hashimoto
A-PEX International Co.Ltd.
www.a-pex.co.jp
> Is EN 6060
Is EN 60601-1-2:2002 listed in the OJ? I can only find reference to the
1993 version. Can we officially use the latest version?
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
===
This mess
John
Does this link provide relevant information?
http://website.lineone.net/~dave.cushman/wiregauge.html
Ian Gordon
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To all interested parties:
The slides from our January presentation : Power Distribution System
Decoupling - How 'bout them vias? is available from our website
at http://www.ieee.org/rmcemc
If you have previously downloaded
the file then please replace it.
Apologies to one and all.
I would als
Hi all,can anyone share with me with your comments
Scenario : Component A with rating mentioned in the UL's product report as
90-135/180-265 Vac, however in the phyical unit is written as 115/230 V .
Q1 : Is this a non conformity ? Should a VN be raised ?
Scenario :In the report, it mentioned
Hi Rich ,
I am new to Product safety but i'd like to share what i know on the
hipot and grounding/bonding test requirement.
Basically these two test are basic test required for product safety
testing.
However it also depend on whether the equipment is class I or II for
electronic and ele
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