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Chapter 7 Tutorial
Attributes of AC Signals
7
Note. If an average-reading voltmeter is used to measure the “DC
voltage” of a waveform, the reading may not agree with the DC Offset
setting of the function generator. This is because the waveform may have
a non-zero average value that would be added to the DC Offset.
You may occasionally see ac levels specified in “decibels relative to
1 milliwatt” (dBm). Since dBm represents a power level, you will need to
know the signal’s RMS voltage and the load resistance in order to make
the calculation.
dBm = 10 x log
10
(P/0.001) where P = V
RMS
2
/R
L
33210A users guide.book Page 324 Wednesday, July 16, 2008 11:16 AM
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