There are some cases that before-and-after inter-symbol interference causes pulse width or level changes of optical disk RF signal. With DL7440/DL7480 History Statistics Function, statistical data processing of multiple waveform parameters can be done, and moreover, if you put a cursor on the list and push the Select key, the corresponding waveform will be displayed.

1. History Statistics makes it easy to evaluate multiple waveforms.
2. Capture and review up to 2048 previous screens by History memory function.
3. It is easy to compare waveforms using the Snap Shot function.