View And Interpret The Am Delay Results - HP 8711C User Manual

Making Measurements
Measuring AM Delay (Option 1 DA or 1DBI
This example is an AM delay measurement of a frequency converter.
2. To interpret the AM delay measurement, refer to Figure 3-18.
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a. Note that the vertical axis is displaying time rather than power as
in previous example measurements. The AM delay measurement
measures the time required for power to travel through the DUT at
various frequencies. The measurement trace will be noisier as the
power level is attenuated by the DUT.
b. Since delay is proportional to the derivative of phase, flat (constant)
delay indicates linear phase. Delay measurements are typically
performed to measure the deviation from linear phase. Deviation from
linear phase (flat delay) would indicate that the DUT is distorting the
signal.
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