[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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