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significant interval of time. This technique lets you increase the horizontal resolution (sample
faster) on a segment of a signal, even when you cannot trigger on that particular segment.
The multizoom function also allows you to zoom on multiple areas of a waveform or on multiple
waveforms simultaneously. You can lock the zoomed areas and scroll through them together or
unlock the zoomed areas and scroll through them independently.
Using Fast Acquisition and DPO
—analog performance from digital technology
When you turn on FastAcq, you can acquire up to 100,000 waveforms per second. In fast
acquisition mode, the "dead time" between acquisitions can be very short, approaching that of the
finest analog oscilloscopes. Reduced dead time means that your chances of capturing an infrequent
event are 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 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) have relatively long dead times between acquisitions;
infrequent events are much more difficult to capture. With fast acquisition and digital phosphor
technology, the oscilloscope 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 digital 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 DPO 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 500 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.
Using Waveform Math
—almost any live calculation that you can imagine
Waveform math in the instrument can be as simple as basic arithmetic or as powerful as building a
complicated math expression.
With the Equation Editor, you can build a complicated math waveform expression using multiple
waveform sources, constants, variables, operators, and functions. The waveform sources can be
any channel, reference, or math waveform. You can enter constants with a keypad. Live results
from the measurement system can be used as variables, and there is a full assortment of arithmetic
operators and math functions to use. As you enter the waveform expression, you will see it appear
as an equation in the control window. You can define up to four separate math waveforms (or two,
if using a 2-channel model).
Summary of Contents for TDS5000B Series
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