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15. Spurious Responses Test

15. Spurious

Responses Test

Related Adjustment

Second Converter Adjustments

Specification

For total signal power of

c-40

dBm at the input mixer of the

analyzer, all image and out-of-band mixing responses, harmonic and

intermodulation distortion products are >75

below the total signal

power for input signals 10 Mhz to 1500 MHz;

>70

below the total

signal power for input signals 100 Hz to 10 MHz.

Second Harmonic Distortion

For a signal -30 dBm at the mixer and

210

MHz, second harmonic

distortion is

>70

down; 60

down for signals

~10

MHz.

Third Order Intermodulation Distortion

For two signals each -30

at the mixer, third-order intermodulation

products are:

Description

Harmonic distortion (second and third) is tested using a signal source

and a low-pass filter. The LPF insures that the harmonics measured

are generated by the spectrum analyzer and not by the signal source.

Spurious responses due to image frequencies, out-of-band mixing, and

intermodulation distortion are measured by applying signals from two

separate sources to the spectrum analyzer input.

Performance Tests

2-49

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HP 8568B Manual de usuario Pagina 71