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Acquiring Waveforms
CSA7000 Series, TDS7000 Series, & TDS6000 Series Instruments User Manual
3-47
Using Fast Acquisition Mode
CSA7000 Series & TDS7000 Series: This section describes how to use Fast
Acquisition mode and how it differs from normal acquisition mode.
Fast acquisition mode reduces the dead time between waveform acquisitions that
normally occur when digitizing storage instruments (DSOs) acquire waveforms.
This dead-time reduction enables Fast Acquisition mode to capture and display
transient events, such as glitches or runt pulses, often missed during longer dead
times that accompany normal DSO operation. Fast Acquisition mode can also
display waveform phenomena at an intensity that reflects their rate-of-occur-
rence.
Fast acquisition XY and XYZ modes also provide intensity information by
accepting continuous, non-triggered data from the input channels.
Measurements and histograms are done directly on the two dimensional array of
display pixels. In infinite persistence mode, the array accumulates more
information and measurements are more accurate.
Some modes/features are incompatible with Fast Acquisitions mode and if you
select them they will inhibit Fast Acquisitions:
H FastFrame and Zoom modes
H Envelope, Average, waveform database, Hi Res, and Single Acquisition
Sequence acquisition modes
H Interpolation (equivalent time sampling is used instead)
H Vectors when in equivalent time mode (waveforms are displayed using
Dots). To determine under what conditions the instrument normally
interpolates or uses equivalent time, see Equivalent-Time Sampling on
page 3--43.
H Math waveforms
H Measurements on channels when in Fast XY or XYZ
H Mask testing (optional on TDS7000 Series instruments)
If you select any of these modes before or while Fast Acquisitions is on, they
will inhibit, temporarily turn off, Fast Acquisitions mode.