Re: [TCML] Matching analog panel meters

["David Rieben" <drieben@xxxxxxxxxxx>]

Hi Drake,

Thanks for the offer ;^) Actually, I am gonna have to purchase
some more meters anyway as I don't already own larger dialed
units of any sort. As far as measuring 200 amps with a 0-5 amp
movement, that's what just about all AC ammeters with scales higher
than 0-50 amps do. The movement is only going to be 0-5 amps
inspite of what is printed on the dial. If your dial scale is 0-200
amps, the movement will still be for only 0-5 amps and you hook up
the meter to the current to be measured via a 200:5 current trans-
former. So in this case, you're actually measuring 1/40th of the total
current flow. That's the way pretty much all high AC current measure-
ments are done. BTW, if you're gonna measure high DC currents, you
would use a shunt instead of a current transformer. An ammeter
would have to be impractically large and wasteful of energy if you
had to actually pass the full 100s or 1000s of amperes of current
through its internal components to measure the current. It's much
simpler and more efficient to measure a small exact portion of the
current.

David

----- Original Message ----- 
From: "Drake Schutt" <drake89@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, December 13, 2007 5:55 PM
Subject: Re: [TCML] Matching analog panel meters


> Yea, if you have access to a scanner, or even a camera really, you just 
> need
> to put it in some sort of picture editing software and change the numbers.
> then just print it out and put it over the original label.  I don't really
> know much about the electrical part, because it seems to me that pushing 
> 200
> amps through a 1-5 amp scale is a bad idea.  if you need me to, i could
> probably help you out since i'm less than a 30 minute drive.
>
> good luck,
> drake
>
> On Dec 13, 2007 3:52 PM, Yurtle Turtle <yurtle_t@xxxxxxxxx> wrote:
>
> > I didn't have to create the scale. I simply scanned my
> > 0-5 amp scale, erased the numbers, added new ones, and
> > printed. This kept the scale, manufacturer, specs,
> > model number, etc.
> > Adam
> >
> > --- David Rieben <drieben@xxxxxxxxxxx> wrote:
> >
> > > Hi Adam, Steve, David S,
> > >
> > > Thanks for the suggestions. However, I don't have
> > > Microsoft
> > > Publisher and would have to get aqainted with it to
> > > just to create
> > > a scale. I'm lazy and would rather just find a pair
> > > of ready made
> > > meters that matched. I have found a few of the China
> > > and Hong
> > > Kong made ones on ebay, like:
> > >
> >
> > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=280182876700&ssPageName=STRK:MEWA:IT&ih=018
> > > or
> > >
> >
> > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=230203000215&ssPageName=STRK:MEWA:IT&ih=013
> > >
> > > but I was kind of hoping to find some of the name
> > > brand with the
> > > larger print dials, like:
> > >
> >
> > http://cgi.ebay.com/General-Electric-2-5-DC-AMP-PANEL-METER-1-100-VDC-NIB_W0QQitemZ300180941624QQihZ020QQcategoryZ58278QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
> > >
> > > Anyway, I may end up getting some of those off-brand
> > > Chinese
> > > ones if I don't have any luck in my search for a
> > > more domestic
> > > source.
> > >
> > > Thanks,
> > > David
> > >
> >
> >
> >
> >
> >
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