Re: [PSES] Making 50 Hz power

[Michael Mertinooke]

Many years ago, a local test lab in Newburyport, MA used decommissioned 
hydroelectric

generators driven by electric motors for their AC mains testing.

For 50 Hz they dropped huge resistors (carbon piles???) in the river and 
just loaded
down the motor-generators. The boiling river water, including some 
pretty decent

parboiled seafood, was certainly something to behold.

See ya
Mike


On 9/7/2018 3:44 PM, IBM Ken wrote:
California Instruments or Pacific Power agile power supplies.  480VAC 
60hz input, variable output.  If >250V l-l is needed, add a step-up 
transformer to the output.  Pacific Power 3060MS cabinets can be 
paralleled to significant output levels.  I assembled a lab with about 
half a megawatt of output power available from a seven cabinet system.


On Fri, Sep 7, 2018 at 3:15 PM, Doug Powell > wrote:


Greetings all,

In the past I've needed to produce three phase 50 Hz power to do
safety, EMC testing as well as certain validation tests.  I've
used several methods including gas powered generators, electric
motor-generators with different sized pulleys and of course AC
Power Sources.  Once again, I am faced with this need and must
make a choice as to which route to follow.  As for budgetary,
rental is preferred over purchase and I am working in the 50 to
100 KVA range.  I d need variable frequency as well as voltage
adjustment for high and low line.  I have a small collection of
transformers to help with large voltage changes.  Although I've
never done it, I am also aware that it is possible to configure
motor-generators with direct drive shafts and select the number of
poles and RPM to change output frequency.

My question is what method are most folks in this forum using when
it comes to 50 Hz higher power levels?

Thanks! Doug



-- 


Douglas E Powell

doug...@gmail.com 
http://www.linkedin.com/in/dougp01

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RE: Compliance Primer

[Michael Mertinooke]

  I took a similar tack, except for 5, 6, and 7, and he 
quietly moved on to pressure another department.
 Best regards,
 Dave Lorusso
 Lorusso Technologies, LLC 

Hah. You expect us to believe you never did a Number Seven?
We know you better than that Dave, you sly dog, you.  =]

And you are absolutely right. We do need to lighten up
now and then.

See ya.
Mike



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RE: CE - the abbreviation

[Michael Mertinooke]

We had a short discussion last autumn about the abbreviation of 'CE'. 

CE... That would mean 'Caveat Emptor', right?

Mike


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RE: [Fwd: User Warning Signal Words]

[Michael Mertinooke]

For a good summary of UL and International label design
rules, go to 
http://www.hazcomsys.com/domes.html


DANGER indicates an imminently hazardous situation which, 
if not avoided, will result in death or serious injury. This signal 
word is to be limited to the most extreme situations.

WARNING indicates a potentially hazardous situation which, 
if not avoided, could result in death or serious injury.

CAUTION indicates a potentially hazardous situation which, 
if not avoided, may result in minor or moderate injury. It may 
also be used to alert against unsafe practices.

ANSI Z535.4 Section 4

See ya.
Mike Mertinooke



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RE: Hertz Vibration?

[Michael Mertinooke]

I found quite a lot of references via Google, to 'Hertzian
Vibration.' A lot of them made reference to contact
closure types of equipment. By inference, it seems to
be used in relation to low-frequency mechanical vibration.

Still sounds like a stupid bit of pseudo jargon to me.
Like 'Hourly time' or 'Gallonic volume.' It's just wrong.

Mike Mertinooke




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A public apology to Agilent

[Michael Mertinooke]

Hi;

A couple weeks ago I politely criticized the HP/Agilent E7401A
spectrum analyzer. Okay, so I called it a piece of garbage.

That was based on two basic facts:
1) It was ridiculously user-unfriendly.
2) Customer support was friendly but unhelpful.

I now wish to publicly apologize. Two nice people at Agilent,
Ms. Cathy Kirk and Mr. Mike Medley, have invested considerable
time and effort on my behalf. I now have an analyzer
that is much less user-unfriendly. And Customer Support,
as represented by these two people, has done a tremendous
job of diagnosing and resolving my issues. Best of all, the 
new firmware has added a bunch of features that I will no 
doubt find useful some day.

Regards,
Mike Mertinooke




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RE: Agilent EMC analyzer

[Michael Mertinooke]

Could be viewed as free advert for Agilent. 

That's okay, John. I replied privately to Gunter, and I called
the E7401A an absolute piece of trash. So it evens out
in the end.

Cheers!
Mike Mertinooke

RE: EMC Wall Charts

[Michael Mertinooke]

I also recommend the Schaffner charts. They are just packed
with good reference information! 

Put them up next to your screen room, situated so when you
have a visitor, the charts would be visible over his shoulder.
The next time some wise guy who has just taken an EMC
seminar asks you to some wise guy question like name 
the dB equivalent of 31.62 microvolts per meter, you
can do a David Letterman chin scratch while casually 
scanning the poster out of the corner of your eye ... and 
say why, of course, in a 377 ohm free space environment,
the square root of 10 being 3.162, then the answer just has
to be, oh, 30 dB microvolts per meter. While I'm at it, did you
also want to know what that is in dB micro amps per meter?

Caution: pull too many of these amazing mental feats out
of the air, and nobody will want to sit at your table in the
cafeteria

See ya.
Mike


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RE: Li-ion Batteries

[Michael Mertinooke]

Is there a European standard for Li-ion batteries?
Is there a battery directive? If yes, what standards is applicable?
CE mark required?
--
As far as I know, the relevant EU directive is 98/101/EC, 22 December
1998, which adapts 91/157/EEC on batteries and accumulators. This
only relates to the chemicals used in the battery.

I asked Moltech Power Systems (Energizer) what directives applied
to EU, and got the reply attached below.

Mike Mertinooke


--
Michael:

Are you joking with this response?  Are you kidding me?

Regards,

Joe DeCarlo
Moltech Power Systems
Ph: 860-257-1020
Fx: 860-257-0165



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RE: Public Health and Safety Signs

[Michael Mertinooke]

signs at work. Is there a similar Directive for health and safety signs for
the general public?

Whoo! The mind boggles! You mean with like people with exclamation
point in triangle tattoos on various portions of the anatomy? Or
biohazard labels on the door of the kids' rooms? Judging
from some of the ANSI Z535 safety labels I see in the catalogs, the
Human Warning Labels would be interesting indeed.   =]

Cheers!
Mike


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RE: HP6842A harmonics analyser - is it obsolete?

[Michael Mertinooke]

Dear Valued Regulatory Test Solution Customer,
Agilent Technologies has recently made a strategic decision regarding our
acsource product family...

...to withdraw from the EMI compliance market. So, within a frame 
of less than five years, I have a $13,000 software investment which 
is no longer supported...


I notice the Agilent Technologies stationery includes the slogan
Innovating the HP Way.  This kind of makes you wonder what
the innovative HP Way of customer support is all about, doesn't it?

How many millions of dollars' worth of equipment have each of
us authorized, or will authorize during our 30 or 40 year careers?
Personally, I very much doubt that I will ever recommend purchasing
another piece of HP/Agilent equipment.

Mike Mertinooke

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RE: we need some information

[Michael Mertinooke]

Heh!  Used a CRT focussing coil with a Lionel train transformer, actually.
By quickly making and breaking the connections I could time the
current so it would accelerate the ball bearing smartly.

And where did we get our CRT focusing coil? Hmm?
You must have been SOME kid to raise!





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Esperanto

[Michael Mertinooke]

Scott:

According to Ergane 4.2;

freedom = libereco
justice = justeco
property = bieno / eco / kvality (three different words meaning property)
private = nepublika / privata / senofica (three different words in
Esperanto,
only one word in English)
protest = protesti / protesto
tyranny = tiraneco

Mike Mertinooke


Muriel,
As you are one who has studied Esperanto, I wonder if you would be kind
enough to list the Esperanto equivalents of the following words in English:

Freedom Liberty   rightsprotesttyranny
?justice property privacy

This is not simply curiosity, as I was unable to find these in any Internet
Esperanto dictionary. I am very aware of the warning given by Eric Blair
(writing as George Orwell) to be cautious about adopting any language which
does not contain words for such concepts.

Scott Lacey


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