Operating instructions

R&S ESCI SENSe:MPOWer Subsystem
1166.6004.12 6.177 E-1
SENSe:MPOWer Subsystem
The commands of this subsystem are used to determine the mean burst power or peak burst power for
a given number of signal bursts, and for outputting the results in a list. Since all the settings required for
a measurement are combined in a single command, the measurement speed is considerably higher
than when using individual commands.
For measuring the signal bursts, the GATED SWEEP function is used in the time domain. The gate is
controlled either by an external trigger signal or by the video signal. An individual trigger event is
required for each burst to be measured. If an external trigger signal is used, the threshold is fixed to TTL
level, while with a video signal the threshold can be set as desired.
The following graphics shows the relation between trigger time, trigger offset (for delayed gate opening)
and measurement time.
t
Trigger
Signal
Trigger
Offset
Measurement
Time
Trigger
Signal
Trigger
Offset
Measurement
Time
Trigger
Signal
Trigger
Offset
Measurement
Time
Depending on the settings made, the measurements are performed with the RMS detector for RMS
power or the PEAK detector for peak power. For all these measurements, TRACE 1 of the selected
system is used.
The setting parameters for this measurement are:
• analyzer frequency
• resolution bandwidth
• measurement time used for a single burst
• trigger source
• trigger level
• trigger offset
• type of power measurement (PEAK, MEAN)
• number of bursts to be measured
The commands of this subsystem can be used in two different ways:
1. Setting up the instrument and at the same time querying the result list:
This method ensures the smallest delay between measurement and the output of the measured
values, but requires the control computer to wait actively for the response of the instrument.
2. Setting up the instrument and querying the result list after synchronization to the end of
measurement:
With this method the control computer can be used for other activities while the instrument is
performing the measurement at the cost of additional time needed for synchronization via service
request.