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Understanding Oscilloscope Functions
TDS1000/2000-Series Digital Oscilloscope User Manual
19
Horizontal Scale and Position; Pretrigger Information
You can adjust the HORIZONTAL POSITION control to view
waveform data before the trigger, after the trigger, or some of each.
When you change the horizontal position of a waveform, you are
actually changing the time between the trigger and the center of the
display. (This appears to move the waveform to the right or left on
the display.)
For example, if you want to find the cause of a glitch in your test
circuit, you might trigger on the glitch and make the pretrigger
period large enough to capture data before the glitch. You can then
analyze the pretrigger data and perhaps find the cause of the glitch.
You change the horizontal scale of all the waveforms by turning the
SEC/DIV knob. For example, you might want to see just one cycle of
a waveform to measure the overshoot on its rising edge.
The oscilloscope shows the horizontal scale as time per division in
the scale readout. Since all active waveforms use the same time base,
the oscilloscope only displays one value for all the active channels,
except when you use Window Zone. For information on how to use
the window function, refer to page 92.
For oscilloscope-specific descriptions, refer to page 35 in the
Operating Basics chapter and page 90 in the Re ference chapter.