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13
Figure 4-7: 1KHz RBW
5.4
N dB Bandwidth Measurement
Following example uses a S1103 signal generator and generates a 500MHz, -10dBm continuous signal.
Example
1)
Connect the signal generator output port to S3531 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 1MHz
4)
Press
【
BW
】
key
，
Select [Res BW Auto Man] and input 30kHz.
Now the signal trace is displayed on screen as shown in following figure.
5)
Press
【
Marker FUCT
】
6)
Select [NdB On Off], turn on the NdB bandwidth measure function. The default value of NdB is 3dB. The value can be
changed by selecting [NdB] and input the required value.
7)
Read out the result
