User Manual

25
Adjust Trigger Delay
Turn the Horizontal Position knob to adjust the trigger delay of the waveform. This will cause the
displayed waveforms to move left or right. The delay number at the top of the screen changes
accordingly. Press this knob to reset the trigger delay to zero.
Changing the delay time moves the trigger point (blue inverted triangle at the top of the screen)
horizontally and indicates how far it is from the time at the center of the screen.
All events displayed left of the trigger point happened before the trigger occurred. These events
are called pre-trigger information and they show the events that led up to the trigger point.
Everything to the right of the trigger point is called post-trigger information and these are events
that occurred after the trigger. The amount of delay range (pre-trigger and post-trigger
information) available depends on the time/div selected and memory depth.
The position knob works (in the Normal time mode) while acquisitions are running or when they
are stopped.
Roll mode
Press the Roll button to enter roll mode.
In Roll mode, the waveform moves slowly across the screen from right to left. It operates only on
time base settings of 50 ms/div and slower. If the current time base setting is faster than the 50
ms/div limit, it will be set to 50 ms/div when the Roll button is pressed.
In roll mode, triggering is not supported. The time reference point on the screen is the right edge
of the screen and refers to the current moment in time. Events that have occurred are scrolled
to the left of the reference point. Since there is no trigger, no pre-trigger information is available.
If you would like to stop the display in roll mode, press the Run/Stop button. To clear the display
and start another acquisition in roll mode, press the Run/Stop button again.
Use roll mode on low-frequency waveforms to yield a display a waveform much like a strip chart
recorder does. At slow sweep speeds, you may want to capture a single trigger (press the Single
button in the Trigger section). When the sweep is finished, the waveform's information will stay
on the screen.
The Zoom Function
Zoom is a horizontally-expanded version of the normal display. You can use Zoom to locate and
horizontally-expand part of the normal window for a more detailed (higher-resolution) view of
signals.
Press the HORIZONTAL Scale Knob to turn on the zoom function; press the button again to turn
off the zoom function. When Zoom function is on, the display divides in half. The top half of the
display shows the normal time base window and the bottom half displays the waveform at a
faster sweep speed.