Teledyne LeCroy WaveMaster 8 Zi_Zi-A - Manual (Page 61)

Getting Started Manual
922133-00 Rev A 53
1. Touch Timebase → Acquisition Status on the menu bar.
OR
Touch Vertical → Channel Status on the menu bar.
2. Touch the Trigger Time tab.
3. Under Show Status For, touch the Time button.
4. Touch inside the Select Segment control and enter a segment
number value (you can also touch the arrow buttons to scroll
through segment times).
RIS Sampling Mode for Higher Sampling Rates
RIS (Random Interleaved Sampling) is an acquisition technique that allows
effective sampling rates higher than the maximum single-shot sampling
rate. It is used on repetitive waveforms with a stable trigger. The maximum
effective RIS sampling rate is achieved by making multiple single-shot
acquisitions at maximum real-time sample rate. The bins thus acquired are
positioned approximately 5 ps (200 GS/s) apart. The process of acquiring
these bins and satisfying the time constraint is a random one. The relative
time between ADC sampling instants and the event trigger provides the
necessary variation.
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 (in the following
graphic) 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.