Is it Normal for the Displayed Waveform to Change Colors if the Position of the Snapshot Waveform Captured on the DL1540C is Moved?

Yes, the color of the snapshot waveform is white so the displayed waveform will change colors if you move the position of the snapshot waveform.

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Mixed Signal Oscilloscopes

A mixed signal oscilloscope is an instrument enabling the simultaneous, time correlated observations and analysis of analog with digital (logic) signals, to establish causal relationships between the various areas of a device's electronics. They are purpose-built tools for troubleshooting electrical anomalies, measuring parametric values, and monitoring cause and effect relationships between signals.