voltage

[Christopher Chan]

On Friday, September 17, 2010 10:00 AM, Li Li wrote:
> 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.
>

Hence the part about the battery in the thing. Or maybe I am not using 
it properly. One day I am going to get zapped.