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LabMaster 10 Zi Oscilloscopes
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.
NOTE: RIS mode is not available when the oscilloscope is operating in
fixed sample rate or DBI 50 - 65 GHz modes.
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LM10Zi-GSM-E Rev A
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