Using The Edge Mode Or Level Mode For Triggering - Keysight X Series Measurement Manual

Concepts
Time Gating Concepts

Using the Edge Mode or Level Mode for triggering

Depending on the trigger signal that you are working with, you can trigger the gate in
one of two separate modes: edge or level. This gate-trigger function is separate from
the normal external trigger capability of the signal analyzer, which initiates a sweep
of a measurement trace based on an external signal.
Edge Mode
Edge mode lets you position the gate relative to either the rising or falling edge of a
Figure 15-22
trigger signal. The left diagram of shows triggering on the positive
edge of the trigger signal while the right diagram shows negative edge triggering.
Example of key presses to initiate positive edge triggering:
Press Sweep, Gate, More, Polarity (Pos).
Figure 15-22 Using Positive or Negative Edge Triggering
Level Mode
In level gate-control mode, an external trigger signal opens and closes the gate.
Either the TTL high level or TTL low level opens the gate, depending on the setting
of Trig Slope. Gate delay affects the start of the gate but not the end. Gate length is
applicable when using level mode triggering. Level mode is useful when your trigger
signal occurs at exactly the same time as does the portion of the signal you want to
measure.
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