About Tektronix oscilloscopes Using fast acquisition and DPO
Using fast acquisition and D PO
When you turn on FastAcq (see page 48), you can acquire up to 250,000 waveforms per second. In fast
acquisition mode, the dead time
(see page 49) between acquisitions can be very short, approaching that of
the finest ana
log oscilloscopes. Reduced dead time means that your chances of capturing an infrequent
event a re greatly improved. More time is spent acquiring and displaying your signal. And with the digital
phosphor (DPO) technology, you can easily differentiate between the normal shape of your signal and
that infrequent anomaly that you want to capture.
As a comparison, high quality analog real-time oscilloscopes
(see page 48) can sweep at high repetition
rates with little dead time between sweeps, which makes it possible to capture an infrequent event.
Typical digital oscilloscopes (DSOs)
(see page 49) have relatively long dead times between acquisitions;
infrequent events are much more difficult to capture. With fast acquisition and digital phosphor technology,
the oscil
loscope acquires at a high repetition rate and then overlays the acquired information into a
three-dimensional database that is updated on the display 30 times per second.
The digi
tal phosphor oscilloscope shows you not only the displayed waveform, but also the sample
density. You can choose to see sample density represented in a color palette or as shades of gray or shades
of green. The D PO display in monochrome green bears a strong resemblance to the CRT of a high-quality
analog oscilloscope. When you increase waveform brightness with the front-panel Intensity knob, areas of
lower sample density appear more clearly.
DPO provides display benefits, whether fast acquisition is on or off. When it is on, DPO helps you
identify an infrequent anomaly in a repetitive signal, especially when either the spectral or temporal color
palettes are used. The repetitive signal appears in one color and the anomalies appear in another. When
fast
acquisition is off, DPO improves the waveform display quality when long records are compressed
for display with the 1000 horizontal pixels in the graticule. The compression algorithm works with the
intensity-graded display to show brighter pixels where many points have been compressed and dimmer
pixels where fewer points have been compressed.
Fast acquisition
Analog oscilloscope sweeps
48 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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