Control Panel
26
3.2
Horizontal Control
Figure 3.3
Horizontal
Control
Horizontal Scale Knob
: Turn the knob to adjust the horizontal scale (time/div). The symbols
above the knob indicate that this control has the effect of spreading out or zooming in on the
waveform using the horizontal scale.
Push the horizontal scale knob to toggle between fine and coarse adjustment.
Zoom Key
: Press the
Zoom
key to split the oscilloscope display into Normal and Zoom sections.
for more details.
Roll Key
: Toggle the roll function on and off. At timebase settings larger than 50 ms/div, it is
recommended to set the oscilloscope to Roll mode so that the waveform is displayed in real time.
See section Roll Mode for more details.
Horizontal Position Knob
: Turn the knob marked
to pan through the waveform data
horizontally. The captured waveform before the trigger (turn the knob clockwise) or after the
trigger (turn the knob counterclockwise) can be seen. Panning through the waveform when the
oscilloscope is stopped (not in Run mode) will display the waveform data from the last acquisition
taken.
Push the horizontal position knob to zero the horizontal position.
3.3
Trigger Control
Figure 3.4
Trigger Control
The Trigger controls determine how the oscilloscope triggers to capture data. These controls consist of:
Setup
: Opens the
Trigger Setup
menu. In the
Trigger Setup
menu, the trigger type, source, and options that
affect all trigger types can be set. See section Triggers for more details.
Normal
: Sets the
Trigger Mode
to
Normal
. In
Normal Mode
acquisitions only occur when the trigger conditions are
met. Otherwise, the oscilloscope holds the last waveform on the display and waits for the next trigger.
Auto
: Sets the
Trigger Mode
to
Auto
. In
Auto Mode
an internal timer triggers the sweep after a preset timeout
period if no trigger has been found so that the oscilloscope continuously updates the display whether a trigger occurs or
not.
