Scirocco-l Digest, Vol 16, Issue 68 (Gauges)

[verboten at michiganvw.org (Jason)]

exactly, all ANY meter is is a voltmeter, modified to measure what you want
it to by way of voltage ;)

On 6/22/06, Brett Van Sprewenburg <brett@netacc.net> wrote:
>
>
> You can build an ammeter with a shunt and a voltmeter.  The shunt
> costs about $14.
> Here's a 100AMP shunt:
>
> <http://www.allelectronics.com/cgi-bin/item/SNT-100/search/
> 100_AMP_SHUNT,_50MV=100_AMPS_.html>
>
> Here's an appropriate meter to use "across" it, also $15:
>
> <http://www.allelectronics.com/cgi-bin/item/
> PM-122/385/3.5_DIGIT_LED_PANEL_METER,_200_MV_.html>
>
> You could also use a DMM to on mV range to calibrate a standard VDO
> voltmeter into amps to accomplish the
> same thing for a more "portable" approach.
>
> ==Brett
>
>
> On Jun 22, 2006, at 10:03 AM, Dan Bubb wrote:
>
> > So, a shunted ammeter uses a shunt!!! ;^)
> > A shunt is a high current, low ohm resistor that is put in series
> > between the battery and any load you want to measure.
> > Then the meter is wired in parallel to the shunt. So, most of the
> > current goes through the shunt but some of the current, in
> > proportion to the ratio of the shunt resistance to the meter
> > resistance, goes thru the meter.
> > Sounds like a cleaner solution. Unfortunately, a shunted ammeter
> > costs about 4 times what a normal ammeter costs!
> > Does anybody care about this?
> > Dan
> >
> >
> > From: Dan Bubb" <jdbubb@verizon.net>
> > To: "GGehrke" <ggehrke@gmail.com>
> > Cc: <scirocco-l@scirocco.org>
> > Sent: Thursday, June 22, 2006 9:39 AM
> > Subject: Re: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)
> >
> >
> > This is my take on an ammeter. All the current needs to go through
> > the ammeter for it to measure it. But, I doubt you'd want to
> > measure the starter motor draw. That might be enough current to
> > melt the ammeter and the wires that run to it. So, you need to
> > leave the starter out of the ammeter circuit, but you want to
> > include everything else including the alternator output.
> > So only the starter motor would connect directly to the positive
> > terminal of the battery. All the other connections to the + battery
> > terminal would get moved to one side of the ammeter, the alternator
> > output would be moved from the starter motor connection to the
> > ammeter and the other side of the ammeter would connect to battery +.
> > OTOH, there is something called a shunted ammeter. I have no clue
> > how that works, but wouldn't mind finding out!
> > Dan
> >
> > From: "GGehrke" <ggehrke@gmail.com>
> > Sent: Thursday, June 22, 2006 9:08 AM
> > Subject: Re: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)
> >
> >
> >>> Ammeter, you can tell if the Alt is charging correctly or not.
> >>> The needle is centered at 0. When you turn the key or put on a
> >>> load it swings to the left. When charging while the engine is on,
> >>> it swings to the right.
> >>
> >> Ah, that makes sense now.  I have an ammeter gauge that I pulled at a
> >> junk yard but wasn't sure how to hook it up because ammeters have to
> >> go in series.  Surely I couldn't run the car's main power through it,
> >> but I figured about the best usage of it would be to monitor some
> >> arbitrary system like the headlights or something.
> >>
> >> But where exactly do you hook it up?  I'm assuming the blue exciter
> >> wire, right?  Cause I know that's what causes the alternator light on
> >> the dash to work...
> >>
> >>> Vacumn shows the manifold air pressure. Are you using a lot of
> >>> fuel or running economically (or have a leak in the 25 YO rubber).
> >>
> >> My BMW has this and literally labels it a "MPG" gauge.  It's one of
> >> those things that's just kinda interesting to watch.  I think I have
> >> one for my scirocco that I'm going to install if I ever get around to
> >> working on the car and not just school stuff :-/
> >>
> >> -Grant-
> >>
> >>
> >>
> >>>> -----Original Message-----
> >>>> From: Chris Effinger [mailto:chriseffinger22@hotmail.com]
> >>>> Sent: Saturday, June 17, 2006 12:52 AM
> >>>> To: scirocco-l@scirocco.org
> >>>> Subject: RE: Scirocco-l Digest, Vol 16, Issue 68
> >>>>
> >>>>
> >>>>
> >>>> has anybody put in aftermarket mechanical gauges ( water
> >>>> temperature, oil
> >>>> pressure)?, wondering if there's an easy way to do it. my 81s
> >>>> originally had
> >>>> some sort of electrical gauge
> >>>>
> >>>> _________________________________________________________________
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> >>>>
> >>>>
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> >>>>
> >>>
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