FreeLists / si-list / [SI-LIST] Re: AC Waveform question

["Tom Dagostino" <tom@xxxxxxxxxxxxx>]

I agree with Tony, the meter will not read zero if the meter is placed after
the bridge rectifier.  The reading you will get depends on the type of AC
measurement capabilities your meter has.  If it has a True RMS capability it
should read the RMS value within bandwidth limitations. If not then you may
get average or not depending how the AC was implemented.

Tom Dagostino
Device Modeling Division
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 430-1065
tom@xxxxxxxxxxxxx
http://www.teraspeed.com


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Dunbar, Tony
Sent: Monday, October 07, 2002 9:32 AM
To: 'SI-List'
Subject: [SI-LIST] Re: AC Waveform question



I don't agree that the average voltage is zero since we are dealing with
full-wave rectification. Only full non-rectified waveform will be average
DC=0.

What Doug describes in his circuit (combination of bridge rectifier and
meter across the bridge is what used to be called and taught as Rectifier
Ammeter or Rectifier Voltmeter.

Regards,
Tony

-----Original Message-----
From: sdb@xxxxxxxxxx [mailto:sdb@xxxxxxxxxx]
Sent: Monday, October 07, 2002 11:13 AM
To: zabinski.patrick@xxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: AC Waveform question



Pat,

In my recollection, you are correct, with one small addition:  On the
DC scale, the meter will read the average value, which will be 0V.
Don't forget that the AC signal is swinging between +1V and -1V.

Stuart

>
> Doug,
>
> Is your meter set to "AC Volts" or "DC Volts"?
>
> My understanding is that "AC Volts" on a meter will
> measure the RMS value, while the "DC Volts" setting
> will measure the average value.
>
> Pat
>
>
> >
> > Hi all,
> >
> > I know I must have learned this in school, but now I'm not
> > sure of the answer!
> >
> > Assume I have a full-wave rectified sine wave of low
> > frequency. Assume the
> > magnitude is 1.0 Volt peak (zero to peak). Assume I apply
> > this wave form
> > across an ordinary 1 Volt analog meter. What does the meter read?
> > The RMS value (.707 Volts)  or
> > The average value (.636 Volts)
> >
> > Doug
> >
>
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