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4.1.2 Reduce the Resolution Bandwidth
The internal noice level is influenced by resolution bandwidth, but continuous wave
signal is not. Decrease RBW into 10%, and the bottom noise will also decrease 10
dB.
1) Reset spectrum analyzer
2) Set the frequency of signal source and amplitude as 1 GHz and -80 dBm.
Connect the RF OUT port of signal source to the RF IN port of spectrum
analyzer and turn on the signal output.
3) Set center frequency, span and reference level:
l Press FREQ → 1GHz
l Press SPAN → 5MHz
l Press AMPT→ - 40dBm
4)
Reduce resolution bandwidth.
l Press BW, and press manual. The resolution bandwidth can be reduced by
knobs and arrow key. Because the noise level reduces, the low level signal
will be clearer, as following picture.
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