The Spectrum Application (RF Measurements)
R&S
®
FPL1000
408
User Manual 1178.3370.02 ─ 03
Drop-out times for falling edge triggers
If a trigger is set to a falling edge ( "Slope" = "Falling" , see
measurement is to start when the power level falls below a certain level. This is useful,
for example, to trigger at the end of a burst, similar to triggering on the rising edge for
the beginning of a burst.
If a drop-out time is defined, the power level must remain below the trigger level at
least for the duration of the drop-out time (as defined above). However, if a drop-out
time is defined that is longer than the pulse width, this condition cannot be met before
the final pulse, so a trigger event will not occur until the pulsed signal is over!
Drop-Out
T
T
T
Figure 7-40: Trigger drop-out time for falling edge trigger
For gated measurements, a combination of a falling edge trigger and a drop-out time is
generally not allowed.
Trigger Holdoff
The trigger holdoff defines a waiting period before the next trigger after the current one
will be recognized.
T
T
Holdoff
Frame 1
Frame 2
T
T
Figure 7-41: Effect of the trigger holdoff
See
Trigger and Gate Configuration
