[Elecraft] DMM for XG2 testing

G3VVT at aol.com G3VVT at aol.com
Sun Oct 23 10:50:26 EDT 2005


 
In a message dated 23/10/05 15:32:01 GMT Daylight Time, w3fpr at earthlink.net  
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.



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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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