About Graph Traces
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Graph traces provide a way to plot one time waveform vs. another, providing certain compensations where applicable. The primary use for these traces is Stimulus-Response measurements where you might want to plot the magnitude of the response against the magnitude of the stimulus; however, the generic nature of these traces allows them to be used in other ways (for example, you could use the time alignment feature to calculate the time difference between two similar signals).
To learn about making complex stimulus-response measurements, see the Stimulus-Response Measurements topic.
There are three groups of traces in the Graph category: Stimulus-Response traces, time traces, and Data Plots.
- Stimulus-Response traces (AM/AM, AM/PM, and Gain Compression) show a particular property of the response versus the stimulus magnitude.
- Time traces (Stimulus Time, Response Time, and Delta EVM Time) show the compensated stimulus or response signal, or the differential EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. for each time point.
- The generic X-Y plot trace (Data Plots) allows users to plot measurement metrics against each other in order to view the comparative relationship.
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