Pinpoint Trigge
rs
Trigger Coupling
Trigger coupling determines what part of the signal is passed to the trigger circuit. Edge triggering can use a ll available
coupling types: AC, DC, Low Frequency Rejection, High Frequency Rejection, and Noise Rejection. All other trigger
types use DC coupling only.
Select the trigger coupling in the Trig > A Event (Main) Trigger Setup menu. For more information, see the instrument
online help.
Horizontal Position
Horizontal position defines where the trigger occurs on the waveform record. It lets you choose how much the instrument
acquires be
fore and after the trigger event. The part of the record that occurs before the trigger is the pretrigger portion. The
part that occurs after the trigger is the posttrigger portion.
Pretrigger data can be valuable when troubleshooting. For example, if you are trying to find the cause of an unwanted glitch
in your test circuit, you can trigger on the glitch and make the pretrigger period large enough to capture data before the
glitch. By
analyzing what happens before the glitch, you may uncover information that helps you find the source of the glitch.
Alternatively, if you want to see what is happening in your system as a result of the trigger event, make the posttrigger period
large enough to capture data after the trigger.
Slope an
d Level
The slope control determines whether the instrument finds the trigger point on the rising or the falling edge of a signal. The
level control determines where on that edge the trigger point occurs.
Delayed Trigger System
You can trigger with the A (Main) trigger system alone or you can combine the A (Main) trigger with the B (Delayed) trigger
to trigger on sequential events. When using sequential triggering, the A trigger event arms the trigger system, and the B
trigg
er event triggers the instrument when the B trigger conditions are met. A and B triggers can (and typically do) have
separate sources. The B trigger condition can be based on a time delay or a specified number of events. (See page 53,
Using A (Main) and B (Delayed) Triggers.)
48 DPO7000 Series and DPO /DS A70000/B Series Quick Start User Manual
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