Anritsu MS8608A, Руководство по эксплуатации, Страница: 153 / 338

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Section 6 Performance Tests
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 MS8608A/MS8609A.
The main point of the test is to apply a signal (with a distortion that is lower than the
MS8608A/MS8609A internal harmonic distortion [at least 20 dB below]) to the MS8608A/
MS8609A 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 MS8608A/MS8609A after passing the signal through a low-pass filter (LPF).
(1) Specification
• Second harmonic distortion:
At mixer input level –30 dBm:
≤
–60 dBc (10 to 200 MHz, Band 0)
≤
–75 dBc (0.2 to 0.85 GHz, Band 0)
≤
–70 dBc (0.85 to 1.6 GHz, Band 0)
At mixer input level –10 dBm:
≤
–90 dBc (1.6 to 3.9 GHz, Band 1–/1+)
(2) Test instruments
• Signal generator: MG3633A
• LPF: With attenuation of 70 dB or more at twice the fundamental
frequencies