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Figure 4-10: Occupied Bandwidth Measurement
4.8.
Use Pre-amplifier to Capture Weak Signals
Following example uses a S1103 signal generator and generates a 500MHz, -80dBm continuous signal.
Example
1) Connect the signal generator output port to S3331 RF test port.
2) Press
【
Preset
】
key to return the instrument to default status
3) Set test frequency.
Press
【
FREQ
】
key
Select [Center FREQ] and input 500MHz
Press
【
Span
】
key
Select [Span] and input 10MHz
4) Enable the pre-amplifier
Press
【
AMP
】
key
Select [Ref level] and input -20dBm
Select [Pre Amp On Off], enable the pre-amplifier
The trace will be displayed as shown in the figure below.
5) Read out the result
