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Note
In real-time sampling, the instrument digitizes all of the points it acquires after one trigger event.
Always use real-time or interpolated sampling to capture single-shot or transient events.
Behavior
Equivalent Time mode lets you accurately acquire repetitive waveforms at sample rates much
higher than the base analog-to-digital converter sample rate. Equivalent time sampling is generally
not useful for acquiring time-varying, random, or single-shot events.
The instrument takes a few samples with each trigger event and eventually obtains enough
samples to construct a waveform record. The instrument takes samples independent of the trigger
position and displays them based on the time difference between the sample and the trigger. You
should only use Equivalent Time mode on repetitive signals.
The sampling speeds and the number of channels that you choose affect the mode that the
instrument uses to sample waveforms in the following ways:
 The instrument always uses real-time sampling at slower time base settings. Faster time
settings force the instrument to switch from real-time sampling to equivalent-time sampling.
 The instrument extends the limit at which it must switch from real-time sampling by using the
digitizers of channels that are turned off to sample the channel or channels that are turned on.
The following tables show the time base setting(s) at which the switch from real-time sampling
(RT) to equivalent-time sampling (ET) occurs for your instrument.
Sampling mode selection TDS5000B
Channels on 1 2 3 or 4
Time base
≥ 800 ps/pt
RT
RT
RT
400 ps/pt RT RT ET
200 ps/pt RT ET ET
≤ 100 ps/pt
ET ET ET
Sampling mode selection TDS5000BE
Channels on 1 2 3 or 4
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