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R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
A.3 Glossary
A-13
Figure A-6 Resolution Bandwidth
Spurious Response
Spurious signals are signals that cause distortion to an ideal signal, and are classified according to their char-
acteristics.
Second harmonic distortion:
This is the distortion caused by the non-linearity of a spectrum analyzer (especial-
ly generated in the mixer) when an ideal, undistorted signal is input to the spec-
trum analyzer. This performance determines spectrum analyzer’s capability of
measuring harmonic distortion (see Figure A-7).
Third order distortion:
This is the distortion caused by the non-linearity of a spectrum analyzer when two
signals with different frequencies f1 and f2 are input, thus outputting two signals:
one signal with frequency 2f1-f2; and another signal with frequency 2f2-fi.
The amplitude of these signals depends on the input levels at the mixer (see Figure
A-7). The maximum value is specified.
Image/Multiple/Extra-band responses:
In addition to the two types of spurious signals described above, there is a third
type called "non-harmonic spurious" that is generated by the spectrum analyzer
with a frequency proper to each spectrum analyzer. There are three types of re-
sponses in the non-harmonic spurious: the image, multiple and extra-band re-
sponses.
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(a)
þ¨ðÚ«¾
(b)
RBW
≤
Signal spacing
RBW = resolution bandwidth
Signal spacing
Resolution bandwidth
(a)
(b)
Resolution