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66
Fig.3.67 Reference level is -45dB
Fig.3.68 Reference level is -30dB
2)
Attenuator and Amplifier
Attenuator is an important part of the Instrument. It can reduce the signal distortion by attenuating the power level
of the mixer input signal. The value of attenuator is from 0 to 55dB with 5dB step, the default value is 10dB. In
auto mode, the system can automatically provide a suitable value of attenuator. If user wants to set the attenuator
manually, user should firstly set the “Atten” soft key to “Manu”, and then input the value by number keys,
“Up/Down” key or the knob. By “Up/Down” cursor or the knob, the change step is 5dB. When inputting value by
number keys, the step is 1dB.
Fig.3.69 and 3.70 show the measurement results under different attenuator. From the channel power measurement
parameters and the blue background height of channel power, we can see the influence of attenuator on the
waveform: at the same time we can also observe the impact of the attenuator the noise floor.
Inside the instrument there is a switch for preamplifier, when the signal amplitude is small and cannot meet the
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