WCDMA TPC Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
802
User Manual 1173.9657.02 ─ 11
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
is useful if the trigger event and the uplink DPCH slot border are not synchronous. A
measurement starts always at an uplink DPCH slot border. Triggering a measurement
at another time may yield a synchronization error.
For internal trigger sources aligned to the downlink DPCH an additional delay of 1024
chips is automatically applied. It corresponds to the assumed delay between downlink
and uplink slot.
This setting has no influence on "Free Run" measurements.
Remote command:
Trigger Time Out
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.
This setting has no influence on "Free Run" measurements.
Remote command:
Minimum Trigger Gap
Defines a minimum duration of the power-down periods (gaps) between two triggered
power pulses. This setting is valid for an "(IF) Power" trigger source.
The trigger system is controlled by means of a timer which is reset to zero in the follow-
ing instances:
●
At the IF power-down ramp of each triggered or untriggered pulse, even though the
previous counter may not have elapsed yet. 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 re-armed as soon as the timer has reached the specified mini-
mum gap.
GUI Reference
深圳德标仪器
135-1095-0799