China Electronics Technology Instruments AV3672 Series, User Manual

Page: 193 / 424

6 Measurement Optimization
6.5 Improvement of Phase Measurement Accuracy
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Fig. 6.6 Schematic Diagram of Test of Long Cable
The delay of the electrical long device can be compensated in the following methods.
1) Reduction of sweep velocity
The sweep velocity can be reduced by increasing the sweep time, reducing the intermediate frequency bandwidth or
increasing the number of sweep points.
a) Increase the sweep time.
Menu path: [Stimulus] > [Sweep] > [Sweep Time...] .
Enter the time or select the time with the arrow.
b) Reduce the intermediate frequency bandwidth.
Menu path: [Response] > [Avg] > [IF Bandwidth...] .
Directly enter the value or select the time with the arrow.
c) Increase the number of sweep points.
Menu path: [Stimulus] > [Sweep] > [Points] .
Directly click the required point number in the sub-menu or click [Custom...] . Enter the value in the [Points]
dialog box or select the value with the arrow.
2) Use of step sweep.
Change analog sweep into step sweep so that the source can step over each test point. In this case, the sweep
velocity of the analyzer can be reduced. The dwell time of each step or test point can also be set.
Menu path: [Stimulus] > [Sweep] > [Sweep Setup...] .
Tick the step sweep . Directly enter the dwell time in the [Dwell time] box or select the required dwell time of each
test point.
6.5 Improvement of Phase Measurement Accuracy
The following characteristics of the analyzer can be applied to improve the accuracy of phase measurement.
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Electrical delay ····································································································· 189
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Port extension ······································································································ 190
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Phase deviation ····································································································· 192
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Frequency point interval ··························································································· 193
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Specific operation ·································································································· 193
6.5.1 Electrical Delay
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The electrical delay can be applied to compensate the linear phase deviation of the DUT so as to highlight the
linear phase deviation of the DUT.