Trigger coupling
Trigger coupling determines what part of the signal is passed to the trigger circuit. Edge triggering can use all available coupling
types: AC, DC, Low Frequency Rejection, High Frequency Rejection, Noise Rejection, and RF coupling. All other trigger types
use DC coupling only. Your instrument may not offer all coupling types.
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 before and after the trigger event. The part of the record that occurs before the trigger is the pretrigger part. The part
that occurs after the trigger is the posttrigger part.
Pretrigger data is valuable when troubleshooting. For example, if you are trying to find the cause of an unwanted glitch in your
test circuit, 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, 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 and 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 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 trigger 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 is based on a time delay or a specified number of events. See Using A (Main) and B (Delayed) triggers on
page 85.
Pinpoint triggers
80 DPO70000SX Series User
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