Acquiring Waveforms
TDS5000 Series User Manual
3-35
NOTE. When using either type of interpolation, you may w ant to set the display
style so that the real samples are intensified and interpolated samples are
dimmed. See Display Style on page 3--107.
The oscilloscope can interleave its channels to attain higher digitizing rates
without equivalent-time sampling. The oscilloscope applies the digitizing
resources of unused channels (that is, channels that are turned off) to sample
those that are in use (turned on). Table 3--3 lists how interleaving more than one
digitizer to sample a channel extends the maximum digitizing rate.
Once you set the horizontal scale to exceed the maximum digitizing rate for the
number of channels in use (refer to Table 3 --3), the oscilloscope will not be able
to get enough samples to create a waveform record. At that point, the
oscilloscope will switch from real- to equivalent-time sampling to obtain
additional samples. (Refer to Equivalent-time Sampling on page 3--33.)
Table 3- 3: How interleaving affects sample rate
Number of channels in use
Maximum digitizing rate when
real-time sampling
(all models)
One 5 GS/sec
Two 2.5 GS/sec
Three or Four 1.25 GS/sec
Using Fast Acquisitions Mode
Fast Acquisitions mode reduces the dead time between waveform acquisitions
that normally occurs when digitizing storage oscilloscopes (DSOs) acquire
waveforms. This enables Fast Acquisitions mode to capture and display transient
events, such as glitches or runt pulses, often missed during longer dead times
that are a part of normal DSO operation. Fast Acquisitions mode can also display
waveform phenomena at an intensity that reflects their rate of occurrence.
Fast XY and XYZ modes also provide intensity information by accepting
continuous, nontriggered data from the input channels.
Several modes/features are incompatible with Fast Acquisitions mode:
H FastFrame mode
H Zoom mode
H Peak Detect, Envelope, Average, and Single Sequence acquisition modes
Interleaving
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