Keysight E4990A - Page 319

Programming
309
Port
T2
Pulse width of /SWEEP
END
10 μs 12 μs -
T3
Time set as the trigger
delay time
-
(see
below
note)
-
The Trigger Delay Time (T3) is not constant, because it is
time that the user sets.
Timing Chart of I/O Port Signal (Point Trigger: On)
When the point trigger function is ON, the /EXTERNAL TRIGGER signal
must be inputted for each measurement point during a single sweep. The
/INDEX signal goes to the High level before starting measurement of the
first measurement point and returns to the Low level after the completing
measurement of all measurement points.
The /READY FOR TRIGGER signal goes to the Low level when the
instrument is ready to accept the trigger signal for the first point and then
goes to the High level when the trigger signal for the first point is received.