Trigger setups Set to 50%
To use
Click Auto to set the holdoff to the default amount of time.
Click the Time button; then click in the Trig Holdoff entry box and use a multipurpose knob to specify
a holdoff time.
Click Random to delay the trigger a random amount of time between triggers.
Behavior
When Holdoff is set to Auto, the holdoff time is based on the time equal to five times the current horizontal
scale setting. You may want to manually set the holdoff time to help stabilize the display of complex
waveforms, such as digital pulse trains tha t may have several possible trigger points.
The Level control
can be either the main trigger level when there is no B Trigger event, or the A Event
trigger level when a B Event trigger is defined. To change the B Event trigger level, change the B Trig
Level control under the B Event tab of the Trigger Setup control window.
What do you want to do next?
Return to the Trigger Setup control window. (see page 385)
Read information on Trigger modes. (see page 389)
Trigger hold off
After a trigger event, the instrument will not accept a nother trigger event until after the holdoff value
is exceeded. Holdoff is usually specified in units of time, but other units may be used.
Set to
50%
Push t
he front-panel Level knob. This control is also available in some trigger s etup windows.
To use
Click this button to have the instrument automatically search for and set the trigger level to a value halfway
betwe
en the peaks of the trigger source signal.
NOTE. Some trigger types support multiple trigger levels, whereas other trigger types are unsupported,
and the front-panel control is inopera tive. This control also works differently for certain Comm triggers.
Set up a parallel bus trigger
From the Trigger menu, select the Bus setup.
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 391
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