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Chapter 3 Demo Waveforms
Demo 2: Phase Modulation Analysis (BPSK)
Notice that the measurement time for the Phase & Frequency Deviation
function in the HP E1742A/46A/48A (Period, Frequency, TI & Phase
function in the HP E1743A/44A) is 10.24 msec. This has been done so the
display will show a number of cycles of the 1 kHz modulation. The use of
automatic pacing will let the TIA determine the appropriate number of
cycles of the 100 kHz carrier to skip, so 10 msec of the signal can be
captured and analyzed. A measurement time of 10.24 msec while
collecting 1024 samples implies that a sample will be captured every
10 µsec.
Since phase deviation is a relative measurement, you have the choice of
making the first phase measurement zero, or making the average phase
deviation zero. The Set initial phase to zero box is not checked for this
measurement, so the average phase deviation will be zero.
3-14
Getting Started Guide
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