Agilent Technologies 93000 SOC Series Training Manual page 490

Lesson 2 – TIA Setup
This is a special mode for propagation delay measurements. In
this mode, any edge on channel 2 is ignored that occurs after
the arming and before the edge on channel 1 that marks the
starting point for the time measurement. This guaranties
positive measurement results, if negative results need to be
avoided, which may be the case in custom test methods.
The second figure below illustrates the operation of the
STARTFIRST mode.
The following figure illustrates the arming options, using a Pulse
Width (PW++) measurement (single channel measurement) as an
example.
TIA Arming Example (PW++ Measurement, Single Channel)
The next figure shows the arming options when performing
Propagation Delay (PD) measurements (dual channel
measurements). It also illustrates the function of the Sequence
Mode STARTFIRST.
TIA Arming Example (PD Measurement, Dual Channel)
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