NB-IoT NPRACH Measurement
R&S
®
CMW-KM300/-KS300
347
User Manual 1178.5689.02 ─ 06
Remote command:
TRIGger:NIOT:MEAS<i>:PRACh:SOURce
TRIGger:NIOT:MEAS<i>:PRACh:CATalog:SOURce?
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 the evaluation of trigger pulses provi-
ded by other firmware applications.
Remote command:
TRIGger:NIOT:MEAS<i>:PRACh:SLOPe
Trigger Threshold
Defines the input signal power where a trigger event is generated for power trigger
sources.
The threshold is a dB value, relative to the reference level minus the external attenua-
tion. If the reference level equals the maximum output power of the DUT and the exter-
nal attenuation settings are correct, the trigger threshold is relative to the maximum
input power.
A low threshold ensures that the input signal is always detected. A higher threshold
can prevent unintended trigger events.
Remote command:
TRIGger:NIOT:MEAS<i>:PRACh:THReshold
Trigger Timeout
Sets a time after which an initiated measurement must have received a trigger event. If
no trigger event is received, a trigger timeout is indicated in manual operation mode. In
remote control mode, the measurement is automatically stopped. The parameter can
be disabled so that no timeout occurs.
Remote command:
TRIGger:NIOT:MEAS<i>:PRACh:TOUT
Min Trigger Gap
Defines a minimum duration of the power-down periods (gaps) between two triggered
power pulses. This setting is valid for "(IF) Power" trigger sources.
The trigger system is controlled by a timer which is reset to zero in the following instan-
ces:
●
At the IF power-down ramp of each triggered or untriggered pulse, even if the pre-
vious counter has not yet elapsed. A power-down ramp is detected when the signal
power falls below the trigger threshold.
●
At the beginning of each measurement. The minimum gap defines the minimum
time between the start of the measurement and the first trigger event.
The trigger system is rearmed when the timer has reached the specified minimum gap.
GUI Reference
深圳德标仪器
135-1095-0799