DMM for XG2 testing

[Ken Bessler]

Does a multimeter used for MDS testing with the XG2
*have* to be one that reads RMS?


     73 de Ken KGØWX - Flying Pigs #-1055
Elecraft K2 #4913 - Kadiddlehoppers #11,807
 
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[Don Wilhelm-3]

Ken,

Most multimeters, when used for AC measurements, do in fact read RMS values.
Specialized meters do exist which will read peak (or average, or whatever),
but the common meters do read RMS only.  If you measure your household AC
voltage (in the US) with your meter, and you find a reading somewhere about
115 or 120 volts, you can be assured that the meter is displaying RMS
values.

You CAN use peak (or other) measurements and convert to RMS so the given
formulas will work correctly, or you CAN create your own formulas which
match the units that your meter does provide - but for my taste, it is far
easier to just use an 'ordinary' DMM.

73,
Don W3FPR

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]]On Behalf Of Ken Bessler
> Sent: Sunday, October 23, 2005 9:53 AM
> To: Elecraft Main Group
> Subject: [Elecraft] DMM for XG2 testing
>
>
> Does a multimeter used for MDS testing with the XG2
> *have* to be one that reads RMS?
>
>
>      73 de Ken KGØWX - Flying Pigs #-1055
> Elecraft K2 #4913 - Kadiddlehoppers #11,807
>
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[G3VVT]

 
In a message dated 23/10/05 15:32:01 GMT Daylight Time, [hidden email]  
writes:

Most  multimeters, when used for AC measurements, do in fact read RMS  values.
Specialized meters do exist which will read peak (or average, or  whatever),
but the common meters do read RMS only.  If you measure  your household AC
voltage (in the US) with your meter, and you find a  reading somewhere about
115 or 120 volts, you can be assured that the meter  is displaying RMS
values.



-----------------------------------------------------------------
 
The only thing to be careful with some DMM are that whilst they will  measure
RMS voltage at AC power frequencies, will be inaccurate at frequencies  in
the kHz range. A early Tandy (Radio Shack) DMM I purchased was wildly  
inaccurate when trying to measure audio frequencies whilst checking large audio  PA
systems, where the 8000 series Fluke was perfectly OK in measuring audio up  to
at least up to 5kHz.
 
Regards,
Bob, G3VVT
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