10 LED O2 monitor

[Bruce Plecan]

How much does it *hurt* one of these high impedance analog meters to see a
reverse voltage?
Say -1.0 on the 5v scale
Bruce


> Subject: Re: 10 LED O2 monitor
> > Some of the old stuff was like less then 10.
> > Hmm, radio shack.
> > I got away from the analogs for auto use 15+ years ago.
> > may have to revisit that.
> > Bruce

> > > Do the analog VOMs have that low of an input impedance?  I have a
radio
> > > shack analog that uses an FET front end, it claims to have a 10M input
> > > impedance for voltage measurement
> > >
> > >  On Tue, 14 Nov 2000, Bruce Plecan wrote:
> > >
> > > >
> > > > O2 sensor is not hardly designed to drive such a low resistance
devise
> > as a
> > > > VOM.  Shouldn't be any less then 20K ohms per volt for reading an
O2.
> > > >
> > > > Best idea in not even bothering with trying to read a switching O2
> other
> > > > then >.4 rich, <.4 lean.  Other then that your just kidding yourself
> > > > Bruce
> > > >
> > > >
> > > >
> > > > >why
> > > > > even screw around with an led display when all you need is a 0-1V
> > analog
> > > > > volt meter....try to find an old simpson 260 or triplett 310 VOM.
> > it'll do
> > > > > just fine and will probably have a better response time for that
> > matter.


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