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Teledyne LeCroy

Sequence Mode in WaveSurfer 3000 Oscilloscopes

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Sequence Mode in WaveSurfer 3000

Oscilloscopes

TECHNICAL BRIEF

Introduction

There are often instances in which an oscilloscope user may need to

capture a large number of fast pulses in quick succession, or, conversely,

a small number of events separated by long periods of time. Either

scenario can be challenging with typical oscilloscope acquisition modes.

Sequence Mode, a standard acquisition mode found in the WaveSurfer

3000 oscilloscopes, enables capture of fine details of complex event

sequences occurring over long time intervals, while ignoring the intervals

between events.

Invoking Sequence Mode

For this demonstration, the input signal on channel 1 is the instrument’s 1-

kHz, 3-V CAL signal with a pulse width of 500 µs. The initial oscilloscope

setup is shown in Figure 1.

Figure 1: This is the initial setup with a waveform on Channel 1 from the

oscilloscope’s CAL output.

June 30, 2014

Summary

Using Sequence Mode, the

WaveSurfer 3000

oscilloscopes from Teledyne

LeCroy store up to one

thousand trigger events as

segments in acquisition

memory. This fast-acquisition

sampling mode offers fast

trigger rates, time stamping of

trigger events, and

minimization of “dead time”

between events.

Summary of content (4 pages)

PAGE 1
Sequence Mode in WaveSurfer 3000 Oscilloscopes June 30, 2014 Summary Using Sequence Mode, the WaveSurfer 3000 oscilloscopes from Teledyne LeCroy store up to one thousand trigger events as segments in acquisition memory. This fast-acquisition sampling mode offers fast trigger rates, time stamping of trigger events, and minimization of “dead time” between events.
PAGE 2
Sequence Mode can be accessed by tapping the Timebase descriptor box or by opening the Timebase pulldown menu and clicking Horizontal Setup. On the Timebase tab, select Sequence under Sampling Mode. This will create a new tab in the Timebase dialog box labeled Sequence. Figure 2: Upon invoking the Sequence Mode option in the Timebase tab, users are presented with the controls dialog at the bottom of the screen. The first section on the left side of the Sequence tab is Acquisition Settings.
PAGE 3
Figure 3: Tapping the Show Sequence Trigger Times button opens the Trigger Times dialog box The first column under the Time section is the segment number, followed by an absolute time stamp (1s resolution). The third column shows the time since Segment #1 and the fourth shows the time between segments. Each segment can be viewed individually or as groups of segments by pushing the front-panel Zoom button or by using the touch screen (Figure 4).
PAGE 4
Conclusion The Sequence Mode acquisition mode found in the WaveSurfer 3000 oscilloscopes is a fast trigger mode that makes the most of the instruments’ acquisition memory. With each memory segment storing a single acquisition, Sequence Mode minimizes dead time between trigger events and enables capture of many fast pulses in rapid succession.