HP 85640A, Руководство по эксплуатации и обслуживанию

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graticule without changing spectrum analyzer settings . See Figure 3-19 . As a result, your
measurement remains calibrated. However , using these two trace math functions may
mean that the top of the screen does not represent the gain-compression limit.
19.
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RANGE LVL increases the dynamic range of the measurement by changing the input
attenuator and IF gain. It is equivalent to
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REF LVL used in signal analysis measurements .
Both
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RANGE LVL and
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REF LVL ensure the input signal is not in gain compression.
T o increase dynamic range of the measurement, press
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RANGE LVL . Note that, while
increasing the dynamic range , more errors are introduced into the measurement, such as
attenuator switching. However , as shown in Figure 3-20 , dynamic range level has increased
when using
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RANGE LVL .
Figure 3-19.
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NORM REF LVL A djusts the Trace and Retains Analyzer Settings
Figure 3-20.
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RANGE LVL Increases Dynamic Measurement Range
HP 85640A RF T racking Generator Operation and Service Manual Operation 3-19