40
To change the time base for the Zoom window, turn the Horizontal Scale knob. The Horizontal
Scale knob controls the size of the darker zoom window on the upper waveform. The Horizontal
Position knob sets the position of the zoom window. Negative delay values indicate that a portion
of the waveform before the trigger event is displayed, and positive values indicate a portion of
the waveform after the trigger event.
If the zoomed time/div (prefaced with Z at the top of the screen) is substantially smaller than the
main time/div, you may see significant jitter on things like the edges of fast-rising pulses. You can
get a stable display for making measurements by pressing the Single trigger button. Turn
persistence on to measure jitter.
To change the zoomed time base of the normal window, turn off the Zoom function and adjust
the Horizontal Scale knob.
3.5
Run Control
Figure 21 - Run control buttons
The Auto Setup button automatically adjusts the oscilloscope's settings to get
a stable display.
Use this button to set the state of the instrument to RUN or STOP. In the RUN
state, the button glows yellow; in STOP state, the button glows red.
Press the button to reset the oscilloscope to its default setup state. This is a
useful starting point to let you manually adjust the oscilloscope for your
needs.
This button has two effects. When measurement statistics are being displayed,
pressing this button will set the statistics to zero and start accumulating data
again. When screen persistence is turned on, pressing this button will clear the
persisted waveforms.
