>
> Hi Mohamed,
>
> How much current will your power factor meter have to handle?
>
> There are standard shunts available (small value power resistors) which
> have a very accurate resistance and develop a small but certain amount of
> voltage across them in proportion to the current going through them. You
> can then amplify this voltage with an op amp and detect its zero crossing,
> as well. However, in order to choose the right kind of shunt, you have to
> know how much current it needs to handle.
>
> Sean
>
> At 10:55 PM 2/7/99 +0200, you wrote:
> >Hi
> >I want to use PIC16F84 to measure power factor witch is (as I know ) the
> >angle between
> >voltage and current. I know how to detect voltage angle (zero crossing ) but
> >how to do it for the current should I use current transformer? any other
> >idea.
> >
> >Thanks in advance
> >
> |
> | Sean Breheny
> | Amateur Radio Callsign: KA3YXM
> | Electrical Engineering Student
> \--------------=----------------
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