Operator's Manual
46 WS-OM-E Rev B
The instrument requires multiple triggers to complete an acquisition. The number depends on the
sample rate: the higher the sample rate, the more triggers are required. It then interleaves these
segments (see figure) to provide a waveform covering a time interval that is a multiple of the
maximum single-shot sampling rate. However, the real-time interval over which the instrument
collects the waveform data is much longer, and depends on the trigger rate and the amount of
interleaving required. The oscilloscope is capable of acquiring approximately 40,000 RIS
segments per second.
Roll Mode
Roll mode 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 selected automatically when the above criteria are met. Otherwise, the scope is in
real-time mode.
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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