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Chapter4 Test Case
u Testing Low Level Signal
Testing Signal Distortion
u
4.1 Testing Low Level Signal
This section introduces how to test low level signal, and how to differentiate it with the
noice in the same spectrum. The following is three methods to test low level signal.
4.1.1 Reduce the Loss of Input
The ability of spectrum analyzer to test low signal is limited by the noice produced
internally. The level is influenced by input attenuator when signal passes the
spectrum analyzer. If the signal is very close to the bottom of noise, it can differentiate
the signal with the noice to reduce the loss of input.
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)
Move the peak value that needed to the center of screen.
l Press MARKER → Peak
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