Basic Concepts
TDS 200-Series Digital Oscilloscope User Manual
17
The channel reference indicator (located on the left of the graticule)
identifies each waveform on the display. The indicator points to the
ground level of the waveform record.
Vertical Scale and Position
You can change the vertical position of waveforms by moving them
up or down on the display. To compare data, you can align a
waveform above another or you can align waveforms on top of each
other.
You can change the vertical scale of a waveform. The waveform
display will contract or expand about the ground level.
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 using 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.
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