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19
a)
Reset the spectrum analyzer
Press
【
Preset
】
key to restart the spectrum analyzer.
b)
Set the center frequency, the span, and the reference level
Set the frequency of the external signal generator to 300MHz and set the amplitude to -80dBm, and connect the
radio frequency output end of the signal generator to the radio frequency input end of the spectrum analyzer. Set
the center frequency of the spectrum analyzer. Press
【
Freq
】
and select [Center Freq] to set the center
frequency to 300MHz, and then select
【
Span
】
to set the span to 5MHz. Press
【
Ampt
】
and select [Ref Level]
to set the reference level to -40dBm.
c)
Move the signal peak to the center frequency (300MHz in this case)
Press
【
Peak
】
and [Marker→Center] to move the signal peak to the center frequency.
d)
Reduce bandwidth
Press
【
BW
】
and set the bandwidth as 1MHz. If necessary, repeat Step c) to ensure that the signal peak is the
center frequency of the Spectrum Analyzer. As shown in Fig. 3.7.
Fig. 3.7 Small Signals when pre-amplifier Off
e)
Enable the pre-amplifier
On this basis, you can further enable the pre-amplifier by pressing
【
Ampt
】
→[Pre Amp Off On], as shown in
Fig. 3.8.
