Operator's Manual
74 ISSUED: October 2003 WR6K-OM-E Rev A
ROLL MODE
Roll mode applies only to WavePro 7000 series scopes, and can be selected when the timebase
mode is real time, time per division is > 200 ms/div, and the sampling rate is < 200 kS/s.
Roll mode is not selected automatically when the above criteria are met. You must select Roll
mode manually from the Timebase dialog each time you want to invoke it.
Roll mode displays, in real time, incoming points in single-shot acquisitions that have a sufficiently
low data rate. The oscilloscope rolls the incoming data continuously across the screen until a
trigger event is detected and the acquisition is complete. The parameters or math functions
connected to each channel are updated every time the roll mode buffer is updated, as if new data
is available. This resets statistics on every step of Roll mode that is valid because of new data.
Note: If the processing time is greater than the acquire time, the data in memory gets overwritten. In this case, the
instrument issues the warning: Channel data is not continuous in ROLL mode!!! and rolling will start over again.
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