Tektronix DPO3000 Series, User Manual

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Display Waveform Data
The Difference Between Vertical Position and Offset. Vertical position is a display function. Adjust the vertical position to
place the waveforms where you want to see them. The waveform baseline locations track adjustments made to their positions.
When you adjust vertical offset, you see a similar effect, but it is actually quite different. Vertical offset is applied before the
oscilloscope preampli
fi er and can be used to increase the effective dynamic range of the inputs. For example, you can use
vertical offset to look at small variations in a large DC voltage. Set the vertical offset to match the nominal DC voltage and
the signal appears in the center of the screen.
50 and 75 Ω Protection. If you select 50 Ω or 75 Ω termination, the maximum vertical scale factor is limited to 1 V/div,
except that with a 10X probe the scale factor is 10 V. If you apply excessive input voltage, the oscilloscope automatically
switches to 1 M
Ω termination to protect the internal 50 Ω or 75 Ω termination. For more details, refer to the speci fi cations in
the DPO3000 Series Oscilloscopes Technical Reference .
Positioning and Labeling Bus Signals
Positioning Bus Signals. Push the appropriate front-panel bus button and turn multipurpose knob a to adjust the vertical
position of the selected bus. (See page 95, Setting Up a Serial Bus .)
1. Push the appropriate front-panel bus button
to select that bus.
DPO3000 Series Oscilloscopes User Manual 151