Tektronix TBS2072, Руководство пользователя

Страница: 52 / 142

Setting channel input parameters
5. To set the position to 0 (center graticule), use the Multipurpose knob to select and click Set to 0 .
The difference between vertical position and vertical offset
Vertical position is a display function that moves the waveform image on the screen. Moving the signal on the screen
does not change the ground (0 volt) baseline level for that signal.
Vertical offset is a signal function that adds a DC voltage to the input signal before the oscilloscope preampli fi er. Adding
this DC voltage moves, or offsets, the signal from the ground (0 volts) level. You use offset to increase the effective
dynamic range of a signal.
For example, you can set the vertical offset to match the peak area of a signal, use the Vertical Position knob to move
the peak area to the center graticule, and then set the Vertical Scale knob to smaller voltage/division settings to look
at more detail in that waveform peak area.
Setting channel deskew
Deskew compensates for differences in signal delays between different cable lengths or probe types. Use Deskew to
adjust the signal delay for individual channels so that all signals arrive at the oscilloscope at the same time. Deskewing
channels lets you take accurate time-related measurements between two or more channels, or when using a current
probe with a voltage probe.
Select one probe as a reference signal and adjust the deskew values for the other channels so that they all align. For best
results, use a deskew
fi xture, such as the Tektronix 067-1686-xx.
The following image shows before and after using deskew to set channel 2 and 4 deskew to minimize the delay with channel 1.
1. Push the Vertical Menu button for the
channel input that you want to set.
2. Push the More side-menu button.
3. Use the Multipurpose knob to select and click Deskew .
4. To set a speci fi c deskew delay, use the Multipurpose knob to select and click 0s . Then use the knob to change and set the
value. The waveform on the screen moves as you adjust the value.
34 TBS2000 Series User Manual