SECTION 6 PERFORMANCE TESTS
6-47
Second harmonic distortion
Even if a signal without harmonic distortion is input to a spectrum analyzer, the higher harmonics are generated
by the analyzer input-mixer non-linearity and are displayed on the screen.
The second harmonic level is the highest harmonic displayed on the MS2665C/67C/68C spectrum analyzer. The
main point of the test is to apply a signal (with a distortion that is lower than the spectrum analyzer internal
harmonic distortion [at least 20 dB below]) to the spectrum analyzer and measure the level difference between the
fundamental wave and the second harmonic. If a low-distortion signal source cannot be obtained, apply a low-
distortion signal to the spectrum analyzer after passing the signal through a low-pass filter (LPF).
(1) Specifications
Second harmonic distortion:
• MS2665C
* Input level at mixer: –30 dBm
≤–60 dBc (10 to 200 MHz, Band 0)
≤–70 dBc (0.2 to 1.55 GHz, Band 0)
* Input level at mixer: –10 dBm
≤–100 dBc or noise level (1.46 to 10.6 GHz, band 1, 2, 3)
• MS2667C
* Input level at mixer: –30 dBm
≤–60 dBc (10 to 200 MHz, Band 0)
≤–70 dBc ( 0.2 to 1.55 GHz, Band 0)
* Input level at mixer: –10 dBm
≤–90 dBc or noise level (1.55 to 15 GHz, band 1, 2, 3, 4)
• MS2668C
* Input level at mixer: –30dBm
≤–60 dBc (10 to 200 MHz, band 0)
≤–70 dBc (0.2 to 1.55 GHz, band 0)
* Input level at mixer: –10 dBm
≤–90 dBc or noise level (1.55 to 20 GHz, band 1, 2, 3)
(2) Test instruments
• Signal generator: MG3633A
69269A
• LPF: With attenuation of 70 dB or more at twice the fundamental frequencies
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