Reference
Key Po ints
Horizontal Sca
le. If waveform acquisition is stopped (using the Run/Stop
or Single button), the Horizontal Scale control expands or compresses the
waveform. Use to zoom in on a detail of the waveform.
Scan Mode Display (Roll Mode). When the Horizontal Scale control is set to
100 ms/div or slower and the trigger mode is set to Auto, the oscilloscope enters
the Scan acq
uisition mode. In this mode, the waveform display updates from left
to right. There is no trigger or horizontal position control of waveforms during
scan mode. (See page 77, Scan Mode Display.)
Window Zone. Use the window zone option to define a segment of a w aveform to
see in more detail (zoom). The Window time base setting cannot be set slower
than the M
ain time base setting.
Vertical bars define Window Zone
Main time base displayed Window zone displayed
Window. Expands the Window Zone to cover the entire screen. Use to change
betw
een two time bases.
NOTE. When you change between the Main, Window Zone, and Window views,
the oscilloscope erases any waveform saved on the screen through persistence.
Persistence is erase d with Horizontal menu changes.
Holdoff. Use holdoff to help stabilize the display of complex waveforms. (See
page 101, Holdoff.)
Math
Push the Math button to display waveform math operations. Push the Math
button again to remove math waveforms. (See page 104, Vertical Controls.)
Options Comments
+, -, ×, FFT Math operations; see the next table
Sources Sources used for the operations; see the next table
TDS2000C and TDS1000C-EDU Series Oscilloscope User Manual 87
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