RMS calculation

Hello all,
I was wondering if someone could point me in the direction of a
standards document on discrete calculation of RMS voltages and
currents.  The application involves a narrow band noise signal from
~20-100Hz.  I have seen a number of methods used, just wondering if
there is a standard, or many, that I could reference.


Thanks,
Mark 

Mac Decman <dearman.mark@gmail.com> wrote:

> I was wondering if someone could point me in the direction of a
> standards document on discrete calculation of RMS voltages and
> currents.  The application involves a narrow band noise signal from
> ~20-100Hz.  I have seen a number of methods used, just wondering if
> there is a standard, or many, that I could reference.

Well, the definition of RMS: (square) Root of the Mean of the Square.

Either as a sum or integral, whichever is appropriate.

On Fri, 15 Feb 2013 08:53:31 +0000 (UTC), glen herrmannsfeldt
<gah@ugcs.caltech.edu> wrote:

>Mac Decman <dearman.mark@gmail.com> wrote:
>
>> I was wondering if someone could point me in the direction of a
>> standards document on discrete calculation of RMS voltages and
>> currents.  The application involves a narrow band noise signal from
>> ~20-100Hz.  I have seen a number of methods used, just wondering if
>> there is a standard, or many, that I could reference.
>
>Well, the definition of RMS: (square) Root of the Mean of the Square.
>
>Either as a sum or integral, whichever is appropriate.
>

Are you joking?

Mark

On Fri, 15 Feb 2013 08:53:31 +0000 (UTC), glen herrmannsfeldt
<gah@ugcs.caltech.edu> wrote:

>Mac Decman <dearman.mark@gmail.com> wrote:
>
>> I was wondering if someone could point me in the direction of a
>> standards document on discrete calculation of RMS voltages and
>> currents.  The application involves a narrow band noise signal from
>> ~20-100Hz.  I have seen a number of methods used, just wondering if
>> there is a standard, or many, that I could reference.
>
>Well, the definition of RMS: (square) Root of the Mean of the Square.
>
>Either as a sum or integral, whichever is appropriate.
>

Did you not read my message? This is the typical horse shit Usenet
response I was expecting.  I asked if there were any standards
regarding RMS calculations.  Not for the definition of RMS.

Mark.

Mac Decman <dearman.mark@gmail.com> wrote:

>>> I was wondering if someone could point me in the direction of a
>>> standards document on discrete calculation of RMS voltages and
>>> currents.  The application involves a narrow band noise signal from
>>> ~20-100Hz.  I have seen a number of methods used, just wondering if
>>> there is a standard, or many, that I could reference.

(snip, I wrote)
>>Well, the definition of RMS: (square) Root of the Mean of the Square.
>>Either as a sum or integral, whichever is appropriate.
 
> Did you not read my message? This is the typical horse shit Usenet
> response I was expecting.  I asked if there were any standards
> regarding RMS calculations.  Not for the definition of RMS.

If you need something more specific, then you need to explain
the specific problem.

What is the source of the signal? How is the noise measurement used?

-- glen

On Fri, 15 Feb 2013 10:11:40 +0000 (UTC), glen herrmannsfeldt
<gah@ugcs.caltech.edu> wrote:

>Mac Decman <dearman.mark@gmail.com> wrote:
>
>>>> I was wondering if someone could point me in the direction of a
>>>> standards document on discrete calculation of RMS voltages and
>>>> currents.  The application involves a narrow band noise signal from
>>>> ~20-100Hz.  I have seen a number of methods used, just wondering if
>>>> there is a standard, or many, that I could reference.
>
>(snip, I wrote)
>>>Well, the definition of RMS: (square) Root of the Mean of the Square.
>>>Either as a sum or integral, whichever is appropriate.
> 
>> Did you not read my message? This is the typical horse shit Usenet
>> response I was expecting.  I asked if there were any standards
>> regarding RMS calculations.  Not for the definition of RMS.
>
>If you need something more specific, then you need to explain
>the specific problem.
>
>What is the source of the signal? How is the noise measurement used?
>
>-- glen

Glen,
 I give up.   You are killing my brain; this should not be hard to
understand.  I just said in the original post that the source was a
voltage and current signal composed of noise.  
I'm just wondering, if there is some standard, IET, ISO, etc. for RMS
calculations with noise?  

Mark.

On Friday, 15 February 2013 10:19:56 UTC, Mac Decman  wrote:
> On Fri, 15 Feb 2013 10:11:40 +0000 (UTC), glen herrmannsfeldt
> 
> <gah@ugcs.caltech.edu> wrote:
> 
> 
> 
> >Mac Decman <dearman.mark@gmail.com> wrote:
> 
> >
> 
> >>>> I was wondering if someone could point me in the direction of a
> 
> >>>> standards document on discrete calculation of RMS voltages and
> 
> >>>> currents.  The application involves a narrow band noise signal from
> 
> >>>> ~20-100Hz.  I have seen a number of methods used, just wondering if
> 
> >>>> there is a standard, or many, that I could reference.
> 
> >
> 
> >(snip, I wrote)
> 
> >>>Well, the definition of RMS: (square) Root of the Mean of the Square.
> 
> >>>Either as a sum or integral, whichever is appropriate.
> 
> > 
> 
> >> Did you not read my message? This is the typical horse shit Usenet
> 
> >> response I was expecting.  I asked if there were any standards
> 
> >> regarding RMS calculations.  Not for the definition of RMS.
> 
> >
> 
> >If you need something more specific, then you need to explain
> 
> >the specific problem.
> 
> >
> 
> >What is the source of the signal? How is the noise measurement used?
> 
> >
> 
> >-- glen
> 
> 
> 
> Glen,
> 
>  I give up.   You are killing my brain; this should not be hard to
> 
> understand.  I just said in the original post that the source was a
> 
> voltage and current signal composed of noise.  
> 
> I'm just wondering, if there is some standard, IET, ISO, etc. for RMS
> 
> calculations with noise?  
> 
> 
> 
> Mark.

Try AES17-1998 and IEC 61606

<snip>
>
>Try AES17-1998 and IEC 61606

Those are both about Digital Audio?  Not sure if those are exactly
where I was looking but I will take a peek.

I should say that the load power is about 2-4kW.  I have built a
circuit with sense resistors (0.01) and high cmr instrumentation amps
to measure the curent and a precision divider network for the voltage.

16 channels are being sampled, 8 voltage and 8 current, at 1-10kHz/ch
multiplexed.  

The DAQ hardware is PC driven so there is really no computational or
memory issues.  

Mark.

On Feb 15, 4:52&#4294967295;am, Mac Decman <dearman.m...@gmail.com> wrote:
> On Fri, 15 Feb 2013 08:53:31 +0000 (UTC), glen herrmannsfeldt
>
> <g...@ugcs.caltech.edu> wrote:
> >Mac Decman <dearman.m...@gmail.com> wrote:
>
> >> I was wondering if someone could point me in the direction of a
> >> standards document on discrete calculation of RMS voltages and
> >> currents. &#4294967295;The application involves a narrow band noise signal from
> >> ~20-100Hz. &#4294967295;I have seen a number of methods used, just wondering if
> >> there is a standard, or many, that I could reference.
>
> >Well, the definition of RMS: (square) Root of the Mean of the Square.
>
> >Either as a sum or integral, whichever is appropriate.
>
> Are you joking?
>
> Mark



Your expectations are a  joke.

Can you point me to to standards for the calculation of pi?

On Feb 15, 2:19&#4294967295;am, Mac Decman <dearman.m...@gmail.com> wrote:
> Hello all,
> I was wondering if someone could point me in the direction of a
> standards document on discrete calculation of RMS voltages and
> currents. &#4294967295;The application involves a narrow band noise signal from
> ~20-100Hz. &#4294967295;I have seen a number of methods used, just wondering if
> there is a standard, or many, that I could reference.
>
> Thanks,
> Mark

Do you mean calculation or measurement.  The  calculation of rms from
a discrete set of data comes straight from the definition.  Why would
anyone  need a standard for calculating the rms value of a discrete
data set?