Re: power measure
- From: quietguy <quietguy@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 15 Sep 2005 01:30:55 GMT
Maybe things have changed, but as I recall most (of the cheaper) analogue
multimeters don't have an AC current range
David
Don Stauffer wrote:
> cgrahl@xxxxxxxxxxxxxxxxxxxx wrote:
> > Hi!
> >
> > I need to measure the power of some devices. I'm thinking to made a
> > digital ampermeter, since I already know the voltage (220 V), I only
> > need to measure the current to get the power (according to the formula
> > P = I x V), right?
> > Does anybody have a schematic or a link to a digital ampermeter?
> > Or have another idea to measure the power of a device?
> > This must be digitally made, since this value will be used in a PIC
> > controller.
> >
> > Thanks in advance.
> >
> > Carlos Augusto Grahl
> >
> Why do you need a digital one? Analog ones work fine, and they are
> cheap. You need a multimeter. The problem is that you did not say what
> power consumption range you need. If less than 10 amps worth, you can
> buy a meter much cheaper than you can make one for.
.
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