Arcane question, and sort of long, but here goes.... Last night, young son was in the process of adding foglights to his car and asked me for some wire to extend the harness. I wasn't sure what the current draw would be so I grabbed one of the foglight assemblies and connected it to the Eico 1050 battery charger/DC power supply which has been part of my garage tool clutter for nearly 50 years: When I cranked the voltage up to 13, the bulb lit brightly and the ammeter on the Eico read around 9 amps. That seemed sort of high to me so I asked the kid, "How big a fuse is in the harness which came with those lights?" he looked at it and told me it was a 15 amp fuse. 15 amps for TWO 9 amp bulbs? Obviously something was't right, so I got my Simpson 260 and saw that the current drawn by that bulb was really a bit less than 5 amps. Since SWMBO was out getting some "retail therapy" I had some free time, and taking the Eico into my workshop, I opened it up, disconnected the leads to the ammeter and fed it with my bench supply. That verified again that it was reading almost twice the DC current passing through it. By a couple of "cut and trys" I found that about 4 inches of 18 gage solid copper wire shunting the meter made it read correctly enough for "gummint work", so I soldered that wire in and closed the Eico back up. I believe the ammmeter is what I used to know as a "moving iron" type, and IIRC the restoring force was supplied by some kind of permanant magnet field, not by a mechanical spring. Am I right about that? I doubt that Eico installed a defective meter when they built the unit around 1965 (The date marked on the meter.) and I'm guessing that the meter's restoring magnet weakened over 50 years, increasing its sensitivity to nearly double. Anyone have any similar experience with those kind of meters, I'd enjoy learning more, just for the shits and grins of it. Thanks guys, Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) "Rudeness is the weak...

Nope. Still a spring. Moving iron vane - The moving iron vane meter operates on the principle of magnetic repulsion between like poles. The measured current flows through a field coil which induces a like magnetic field into a fixed and moving vane causing the moving vane to deflect a pointer in proportion to the current or voltage applied to the coil.

"The Demon Prince of Absurdity" wrote in message news:If I kill-filed everyone who was too clueless to post correctly it would be a lonely place.

The Demon Prince of Absurdity wrote in news:Likewise. >:)

---So we should all carry white canes?-- John FieldsProfessional Circuit Designer

DC Ammeter Sensitivity Increased?

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Homer J Simpson 19 years ago

"The Demon Prince of Absurdity" wrote in message news: snipped-for-privacy@hell.corn...

If I kill-filed everyone who was too clueless to post correctly it would be a lonely place.

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Meat Plow 19 years ago

On Fri, 29 Sep 2006 04:23:07 +0000, Homer J Simpson Has Frothed:

Pretty good reason then not to piss and moan about it right?

Pierre Salinger Memorial Hook, Line & Sinker, June 2004 COOSN-266-06-25794

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Meat Plow 19 years ago

On Fri, 29 Sep 2006 00:30:31 +0100, Tim Auton Has Frothed:

*ploink*

Meat

Pierre Salinger Memorial Hook, Line & Sinker, June 2004 COOSN-266-06-25794

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Lostgallifreyan 19 years ago

The Demon Prince of Absurdity wrote in news: snipped-for-privacy@hell.corn:

Likewise. >:)

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John Fields 19 years ago

So we should all carry white canes?

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Homer J Simpson 19 years ago

But it's still worth reminding folk to snip. Try being on a mail list where someone replies to a 50 message digest - and adds nothing to the glop.

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Homer J Simpson 19 years ago

You're an American. I don't expect you to give a damn about your fellow citizens - or anyone else on earth.

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Damian 19 years ago

Jealousy like that is so ugly.

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Homer J Simpson 19 years ago

Who the hell is jealous of you? I merely write what I observe.

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Damian 19 years ago

I don't know, why do you ask? Are you jealous of more than John?

Oh, you're vision impaired. Sorry.

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Homer J Simpson 19 years ago

Better than being brain impaired like you.

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Peter Dettmann 19 years ago

Your observations are getting furthur from reality the more you go on. Sensisbly you would stop now before making more of a fool of yourself.

Peter Dettmann

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Jim Thompson 19 years ago

Then Homer must be the UGLIEST SOB on the planet ;-)

...Jim Thompson

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Mark Zenier 19 years ago

In article , Jeff Wisnia wrote: ...

Er, are you feeding a peak reading meter the unfiltered output of a full wave rectifier?

Mark Zenier snipped-for-privacy@eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com)

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Homer J Simpson 19 years ago

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

"My teacher made me feel bad. I must kill him."

Identify the country.

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Damian 19 years ago

Burnaby, BC, CA.

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Homer J Simpson 19 years ago

Specify the case details.

BTW, only a complete idiot confuses the head office of a multi province ISP with the location of its many thousands of users.

Oops, that must mean you.

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Damian 19 years ago

Look them up.

What, or Who are you babbling about? I made no reference to any ISP, I identified the locale to your question.

Look again, complete idiot. Oh s*it, that's right; you're blind.

Bye.

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Homer J Simpson 19 years ago

Name the student, teacher and school and provide the details of the assault, asshole. Or admit you are a pile of lying s*it.

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John Fields 19 years ago

What you observe is so colored by your jealousy that you _have_ to make it seem like we're the bad guys so you can divorce yourself from your desire to be American. That way you can pretend to be happy with your lot, even though you know deep-down that you're not. If you were would you be writing all that ugly America-bashing stuff? Shirley not.

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DC Ammeter Sensitivity Increased?

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