1xEV-DO Measurements
R&S
®
CMW-KG8xx/-KM8xx/-KS8xx
289
User Manual 1173.9511.02 ─ 11
The trigger event has to be synchronized to the start of frame. To achieve that, it is
necessary to adjust the
.
●
IF Auto Sync
The measurement is triggered by the level of the IF signal (rising or falling edge
according to trigger slope setting), at a configurable trigger threshold. The trigger
event is automatically synchronized to a frame start.
●
…External…:
External trigger signal fed in via TRIG A or TRIG B on the rear panel of the instru-
ment.
●
Others
Other firmware applications, e.g. the 1xEVDO signaling application (option
R&S CMW-KS880) or the GPRF generator, may provide additional trigger modes.
Refer to the documentation of the corresponding firmware application for a descrip-
tion of these trigger modes.
Remote command:
Trigger Slope
Qualifies whether the trigger event is generated at the rising or at the falling edge of
the trigger pulse. This setting has no influence on "Free Run" measurements and for
evaluation of trigger pulses provided by other firmware applications.
Remote command:
Trigger Threshold
Defines the input signal power where the trigger condition is satisfied and a trigger
event is generated. The trigger threshold is valid for power trigger sources. It is a dB
value, relative to the reference level minus the external attenuation (<Ref. Level>
–
<External Attenuation (Input)>
–
<Frequency Dependent External Attenuation>). If the
reference level is set to the actual maximum output power of the DUT, and the external
attenuation settings are in accordance with the test setup, then the trigger threshold is
referenced to the actual maximum RF input power at the R&S
CMW.
A low threshold may be required to ensure that the R&S
CMW can always detect the
input signal. A higher threshold can prevent unintended trigger events.
Remote command:
Trigger Delay
Defines a time delaying the start of the measurement relative to the trigger event. This
setting has no influence on "Free Run" measurements.
Remote command:
GUI Reference
深圳德标仪器
135-1095-0799
