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S/N=85dBc/Hz - 10×log(30kHz) =40.2dBc/(30kHz)
If the differential marker is less than one fourth of the edge distance between the signal peak and response, errors
may occur in noise measurement.
Fig. 4-10 S/N Measurement
3) Noise measurement by noise marker function
In this example, the noise of 1Hz bandwidth is measured by the noise marker function, using the 1GHz external
signal.
a) Set the output signal of the signal generator:
Set the frequency of the signal generator as 1GHz and power as -10dBm. Connect the output of the signal
generator to the input port of the spectrum analyzer, and enable the ON state of the radio frequency.
b) Set the center frequency, span, reference level and attenuator.
Press [Reset].
Press [Frequency], [Center Frequency], 999.98[MHz]
Press [frequency], [Span] and 100[kHz].
Press [Amplitude], [Ref Level] and -10[dBm].
Press [Amplitude], [Atten Auto Man] and 40[dB].
