Ceyear 4051 Series, User Manual

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4. Operating Instruction
4.2 Advanced operation guide
109
Step 7. set attenuator as 0 dB in order to observe the measured signal more clearly:

Press 【 Amplitude/Y Axis 】 , [Attenuation ▶ ], [Mech Atten AutoMan] and enter 0 dB.
Fig. 4.25 shows the measured signal displayed by the analyzer when the attenuator decrement is 0 dB.
Fig. 4.25 Small signal when attenuator is set as 0 dB
Caution
Please remember to restore attenuation value of the analyzer after test in order to protect the RF input port.
Press 【 Amplitude/Y Axis 】 , [Attenuation ▶ ], [Mech Atten Auto Man] or press 【 Couple 】 and [Couple All].
4.2.3.2 Reduce resolution bandwidth to measure small signals
The resolution bandwidth affects the noise floor inside the analyzer but has no effect on measurement of the
level of continuous-wave signals. The relation between noise reduction and resolution bandwidth can be
expressed with the following formula:
Where, ΔL refers to change in the noise amplitude (dB).
BW1 and BW2 refer to different resolution bandwidths (hz).
Therefore, when the frequency bandwidth is reduced by 10 times, the noise floor will be reduced by 10 dB.
Step 1. reset the Series Signal Analyzer:
 Press
【
Preset
】
.
Step 2. Set the signal generator and connect the Series Signal Analyzer: