Rohde & Schwarz FPL1000 Series, Руководство пользователя

Страница: 405 / 899

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
405 User Manual 1178.3370.02 ─ 03
Filter Bandwidth Filter Type Application
4.096 MHz, a=0.22 RRC W-CDMA NTT DOCoMo
5 MHz CFILter
CFILter
CFILter
CFILter
7.7 Trigger and Gate Configuration
Triggering means to capture the interesting part of the signal. Choosing the right trigger
type and configuring all trigger settings correctly allows you to detect various incidents
in your signals.
Gating allows you to restrict measurement analysis to the important part or parts of the
signal, for example bursts.
● Triggering ..............................................................................................................405
● Gating ....................................................................................................................414
7.7.1 Triggering
7.7.1.1 Triggered Measurements
In a basic measurement with default settings, the sweep is started immediately. How-
ever, sometimes you want the measurement to start only when a specific condition is
fulfilled, for example a signal level is exceeded, or in certain time intervals. For these
cases you can define a trigger for the measurement. In FFT sweep mode, the trigger
defines when the data acquisition starts for the FFT conversion.
An "Offset" can be defined to delay the measurement after the trigger event, or to
include data before the actual trigger event in time domain measurements (pre-trigger
offset).
For complex tasks, advanced trigger settings are available:
●
Hysteresis to avoid unwanted trigger events caused by noise
●
Holdoff to define exactly which trigger event will cause the trigger in a jittering sig-
nal
● Trigger Source ...................................................................................................... 406
● Trigger Offset ........................................................................................................ 406
● Trigger Hysteresis .................................................................................................406
● Trigger Drop-Out Time ..........................................................................................407
● Trigger Holdoff ...................................................................................................... 408
Trigger and Gate Configuration