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RF Measurement Basics
4
V3500A User’s Guide
85
RF power measurement
Low frequency method
At low frequencies, power delivered from an AC source to a
load can be measured with an AC voltmeter connected
across the load terminals (see
). The voltmeter
provides a high enough input resistance that at low
frequencies, the effective value of load resistance is not
changed.
Figure 4-1
Low frequency power measurement
High frequency method
At high frequencies, the low frequency measurement
technique produces inaccurate readings. To produce reliable
results, a different method is required.
Inaccurate readings could be caused by parasitic capacitance
in low frequency method. Parasitic capacitance causes the
impedance of the shunt voltmeter to decrease, thereby
behaving unpredictably with frequency.
The high frequency method replaces the AC Voltmeter (as
described in the
) with an RF power
meter (the RF power meter has an internal, known load
AC
R
Signal
source
Voltmeter
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