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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
dB
below the total signal
power for input signals 10 Mhz to 1500 MHz;
>70
dB
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
dB
down; 60
dB
down for signals
~10
MHz.
Third Order Intermodulation Distortion
For two signals each -30
dB
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