voltage

[Li Li]

On Fri, 2010-09-17 at 08:35 +0800, Christopher Chan wrote:
> On Friday, September 17, 2010 07:57 AM, Vic Main wrote:
> > At 04:26 PM 09/16/10, you wrote:
> >> On Friday, September 17, 2010 12:24 AM, Johnny Rosenberg wrote:
> >>> Den 2010-09-16 06:35:15 skrev terry l<xtlynne at charter.net>:
> >>>
> >>>> 311 volts is 220, peak to peak
> >>>>
> >>>
> >>> Yes, it is. So did someone ask this or why did you write that?
> >>>
> >>
> >> Terry has this knack of not responding in the thread concerned. My
> >> digital multimeter reports somewhere around 311V but I am supposed to be
> >> in a 220V environment. Maybe the battery is dead and so certain
> >> functions are not available and so I get the 3xxV figures.
> > Kind of off topic, but not all digital multi meters read AC RMS
> > voltages correctly. The more expensive one's do i.e. Fluke, HP,
> > Philips, Tektronix, etc.
> >
> 
> The thing is, it did read 2xx before so unless I had major problems 
> before...
> 
As I pointed out to you last week:  311 x 0.707 = ~220.  You're reading
peak.  Maybe you're not using the meter correctly, or maybe it stopped
being a true RMS meter.  If the mains voltage were that much higher than
it should be, all kinds of things would be smoking.

-- 
Lilly
godbless --everyone --no-exceptions
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