Tektronix MDO3012, Руководство пользователя

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Display Waveform or Trace Data
Quick Tips
Preview. If you change the Position or Scale controls when the acquisition is stopped or when it is waiting for the next
trigger, the oscilloscope rescales and repositions the relevant waveforms in response to the new control settings. It
simulates what you will see when you next push the
RUN button. The oscilloscope uses the new settings for the next
acquisition.
You may see a clipped waveform if the original acquisition went off the screen.
The math waveform, cursors, and automatic measurements remain active and valid when using preview.
Setting Input Parameters
Use the vertical controls to select waveforms, adjust the waveform vertical position and scale, and set input parameters.
1. Push a channel menu button 1 , 2 , 3 , or 4 to
bring up the vertical menu for the designated
waveform. The vertical menu only affects
the selected waveform.
Pushing a channel button will also select or
cancel that waveform selection.
2. Push Coupling repeatedly to select the
coupling to use.
Use DC coupling to pass both AC and DC
components.
Coupling
DC | AC
Termina-
tion
1M Ω | 50 Ω
Invert
On | Off
Bandwidth
Full
(1) Label
More
Use AC coupling to block the DC component
and show only the AC signal.
3. Push Termination repeatedly to select the
input impedance to use.
Set the input impedance (termination) to
50
Ω or 1 M Ω if using DC coupling. Input
impedance is automatically set to 1 M Ω
when using AC coupling.
75
Ω is available on models ≤ 500 MHz.
For more information on input impedance,
see
Quick Tips . (See page 112, Quick
Tips .)
4. Push Invert to invert the signal.
Select Off for normal operation and On
to invert the polarity of the signal in the
preampli
fi er.
MDO3000 Series Oscilloscopes User Manual 109