256
Using the MultiZoom Feature
Use the instrument MultiZoom feature to magnify an acquisition vertically, horizontally, or in
both dimensions to let you see the fine detail in your signals without changing the acquisition
parameters (sample rate, record length, and so on). For example, to temporarily expand the front
corner of a pulse to inspect its aberrations, push the front-panel MultiZoom button to expand it
horizontally and vertically.
To help you use Mulitzoom effectively, consider how it operates on waveforms:
When zooming vertically, the instrument expands up to four zoomed areas at one time. The
zoomed areas can all be on the same waveform or they can be on different Channel, Math or
Reference waveforms. Each zoomed area has its own vertical position and factor.
When zooming horizontally, the Zoom Source is either the acquisition waveform or one of the
zoomed areas.
When zooming either horizontally or vertically, Zoom expands or contracts the waveform by
the Zoom Factor.
Automatic Measurements
All channel, reference, and math waveforms can serve as sources for automatic measurements.
Some measurements, such as Delay and Phase, require two sources.
The following automatic measurement categories are available:
Amplitude
Time
More (miscellaneous)
Histogram
Communication
The instrument can take and update up to eight measurements at one time. You can apply
measurements to any combination of sources. For example, you can take all eight measurements
on Channel 1, or you can take measurements on a combination of channel waveforms, math
waveforms, reference waveforms, and/or histograms.
High/Low Method
The levels that the automatic measurement system derives as the High (top) or Low (bottom) for a
waveform influence the fidelity of amplitude and aberration measurements. Select among the
modes the instrument provides for determining these levels:
Histogram mode sets the values statistically. It selects the most common value either above or
below the midpoint (depending on whether it is defining the High or Low reference level).
Since this statistical approach ignores short term aberrations (overshoot, ringing, and so on),
Histogram is the best setting for examining pulses. See the figure below.
Min-Max mode uses the highest and lowest values of the waveform record. This setting is
best for examining waveforms that have no large, flat portions at a common value, such as
sine waves and triangle waves (almost any waveform except for pulses). See the figure below.
Summary of Contents for TDS5000B Series
Page 36: ...36 AFTDS Differential Signal Adapter...
Page 280: ...280 Blackman Harris window...
