R&S FSPN - Page 135

Common Measurement Settings
R&S
®
FSPN
135User Manual 1179.4363.02 ─ 01
Trigger Offset
Defines the time offset between the trigger event and the start of the measurement.
Offset > 0: Start of the measurement is delayed
Offset < 0: Measurement starts earlier (pretrigger)
Remote command:
TRIGger[:SEQuence]:HOLDoff[:TIME] on page 392
Defining a trigger hysteresis
The trigger "Hysteresis" is the distance in Hz to the trigger frequency that the trigger
source must exceed before a trigger event occurs. Setting a hysteresis avoids unwan-
ted trigger events caused by frequency oscillation around the trigger frequency.
The trigger hysteresis is available for the frequency trigger.
Remote command:
TRIGger[:SEQuence]:FREQuency:HYSTeresis on page 391
Trigger Holdoff
Defines the minimum time (in seconds) that must pass between two trigger events.
Trigger events that occur during the holdoff time are ignored.
Remote command:
TRIGger[:SEQuence]:IFPower:HOLDoff on page 392
Defining a trigger slope
The trigger slope defines whether triggering occurs when the signal level or frequency
rises to the trigger level or frequency or falls down to it.
Remote command:
TRIGger[:SEQuence]:SLOPe on page 393
Defining a trigger drop-out time
The drop-out time is the minimum time period that must have passed between two
consecutive trigger events without initiating another measurement after the first trigger
event has occurred and initiated a measurement.
For the frequency trigger, the drop-out time avoids the triggering of another measure-
ment just because the frequency of the DUT is not yet stable.
Example:
The trigger event is a certain frequency on falling slope.
The first trigger event that initiates the measurement occurs. After some time, the trig-
ger frequency again falls below the trigger frequency - this happens several times, until
the DUT is stable.
Without a drop-out time, the R&S FSPN would start a measurement each time the fre-
quency falls below the trigger frequency. With a drop-out time, however, only the first
trigger event initiates a measurement. The other trigger events after the first are
ignored, because the undesired events are within the drop-out time.
PN Transient Analysis Configuration