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Making Measurements Using Spectrum Analyzer Mode
Third Order Intermodulation Measurement
(TOI)
It is important to verify that the
TO1
being measured is coming from the
device under test and not from the spectrum analyzer. An easy way to do
this is as follows:
1. Set up the
TO1
measurement and turn it on.
2.
Press
lJKEEF],
ATTEN
AUTO MAN (AUTO) and increase the
attenuation + 10
dB
by pressing
($J
3. If the displayed result of the
TO1
measurement remains constant, then the
value is the result of the device under test.
4. If the displayed result of the
TO1
measurement decreases, then the value is
due to spectrum analyzer distortion and not the device under test. In this
case, continue to increase the attenuator setting until the measurement
result no longer changes as the attenuator is changed. When the value
remains constant, the result is from the device under test.
Increasing the attenuator setting of the spectrum analyzer decreases
the level of the signal internal to the spectrum analyzer and therefore
decreases the distortion generated by the analyzer. Refer to the
characteristics information in specifications and characteristics in your
calibration guide for a graph of the typical distortion performance of the
spectrum analyzer.
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