R&S CMW-KG4 Series, Руководство пользователя, Страница: 599 / 988

WCDMA Multi Evaluation Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
599 User Manual 1173.9657.02 ─ 11
3.3.2.4 Trigger Settings
The "Trigger" parameters configure the trigger system for the WCDMA multi evaluation
measurement.
Fig. 3-26: Trigger settings
Trigger Source ............................................................................................................ 599
Trigger Slope ...............................................................................................................600
Trigger Threshold ........................................................................................................600
Trigger Delay ...............................................................................................................600
Trigger Time Out ......................................................................................................... 600
Minimum Trigger Gap ................................................................................................. 601
Trigger Source
Selects the source of the trigger event. Some of the trigger sources require additional
options.
●
Free Run (Standard):
The measurement starts immediately after it is initiated. The R&S CMW decodes
the signal to derive its slot and frame timing. This procedure is repeated after each
measurement cycle.
●
Free Run (Fast Sync):
Similar to "Free Run (Standard)", however, the R&S CMW assumes that the frame
period of the detected signal is close to the nominal 10 ms WCDMA frame length.
The timing is only corrected after each measurement cycle using a faster algorithm,
which results in faster continuous measurements.
If you experience problems with this trigger mode, use Free Run (Standard)
instead.
●
IF Power:
The measurement is triggered by the power of the received signal, converted into
an IF signal. The trigger event coincides with the rising or falling edge of the detec-
ted WCDMA power step. This setting can be used to measure short signal bursts
when no continuous WCDMA signal is available.
●
IF Power (Sync):
Similar to "IF Power", however the R&S CMW tries to synchronize to the signal
during a full slot after the trigger event. This setting can be used to measure short
signal bursts where the beginning of the burst does not exactly coincide with a slot
boundary. The start of the measurement takes longer than with "IF Power".
●
…External…:
GUI Reference
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135-1095-0799