Horizontal and acquisition setups Select a sampling mode
To use
To enable a sampling mode, click one of the Sampling Modes button.
In Real Time, the instrument acquires all the points in a waveform record af ter one trigger event.
In Interpolated time, the instrument interpolates between the samples it acquire s w he n it ca nnot
acquire all the real samples it needs to fill up its waveform record. The instrument can interpolate
either as part of an acquisition or as part of the zoom/display behavior.
In Equivalent time, sampling begins when the time base setting (horizontal scale) is too fast to let the
instrument get enough samples with which to create a waveform record using real-time sampling.
NOTE. In real-time sampling, the instrument d igitizes 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
Equi
valent 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.
190 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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