Tektronix, Inc. P6240, User Manual

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Scaling and Positioning Waveforms
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TLS 216 User Manual
Vertical System
You can adjust the vertical position of the selected waveform group by moving it
up or down on the display. For example, when trying to compare two groups of
waveforms, you can put one above another and compare them, or you can
overlay them on top of each other. To move the selected waveform group, turn
the Vertical POSITION knob.
Besides using the position knob, you can set the vertical position to an exact
number. You do that with the Position selection in the Vertical menu and the
general purpose knob and/or the keypad.
You can also alter the vertical scale. The logic scope shows the scale (in volts per
division) for each active group of channels toward the bottom left of the display.
As you turn the vertical SCALE knob clockwise, the scale decreases. The
decreased scale results in higher resolution because you see a smaller part of
each waveform. As you turn the knob counterclockwise, the scale increases
allowing you to see more of each waveform but with lower resolution.
Vertical offset changes where the group reference indicator is shown with respect
to the graticule. Offset adds a voltage to the reference indicator without changing
the scale. That feature allows you to move the waveform group up and down
over a large area without decreasing the resolution.
Offset is useful in cases where a waveform has a DC bias. One example is
looking at a small ripple on a power supply output. You may be trying to look at
a 100 mV ripple on top of a 12 V supply. The range available with offset can
prove valuable as you try to move and scale the ripple to meet your needs.
Horizontal System
Adjusting the horizontal position of waveform groups moves them right or left
on the display. That is useful when the record length of a waveform is so large
(greater than 500 points) that the logic scope cannot display the entire waveform
record at one time.
You can also adjust the scale of the waveform. For example, you might want to
see just one cycle of a waveform to measure the overshoot on its rising edge.
You adjust the horizontal scale of the displayed waveform records using the
horizontal SCALE knob and the horizontal position using the horizontal
POSITION knob.
The logic scope shows the actual scale in the bottom right of the display. The
scale readout shows the time per division used. Since all groups containing live
Scale
Offset