Operating Basics
TDS5000B Series Quick Start User Manual
41
Horizontal Position
Horizontal position is an adjustable feature that defines where the trigger occurs on the waveform record. It lets
you choose how m uch the instrume nt ac quires before and afte r 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 c an trigger on the glitch and make the pretrigger period large enough to
capture data before the glitch. By a nalyzing what happens before the glitch, you may uncov er 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 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 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 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 can be based on a time delay or a
specified number of events. See Using A (Main) and B (Delayed) Triggers on page 45 to learn how to use the
delayed trigger system.
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