Operating instructions

More Complex Programming Examples R&S ESCI
1166.6004.12 7.32 E-1
Multi-Burst Power Measurement
The multi-burst power measurement function is suitable for measuring the power of a sequence of
pulses with the following characteristics:
• The pulses occur at variable time intervals.
• The levels of all pulses of the sequence are reliably above the trigger threshold, or an external
trigger signal is used.
The function requires one trigger event per pulse. This means that if the video trigger or the IF power
trigger is used, the levels of all pulses must be above the trigger threshold.
The function is, therefore, particularly suitable for re-measuring DUTs already adjusted and whose
output power is within the specified range. The measurement is optimized for minimum overhead
relative to the actual measurement time.
t
Trigger
Signal
Trigger
Offset
Measurement
Time
Trigger
Signal
Trigger
Offset
Measurement
Time
Trigger
Signal
Trigger
Offset
Measurement
Time
Trigger
T
hreshold
Fig. 7-2 Block diagram illustrating signal processing in analyzer
Either the root-mean-square power or the peak power is measured, depending on whether the RMS
detector or the PEAK detector is selected. The function always uses TRACE 1 of the selected screen.
The following parameters are to be set for this measurement:
• Analyzer frequency
• Resolution bandwidth
• Measurement time per single pulse
• Trigger source
• Trigger threshold
• Trigger offset
• Type of power measurement (PEAK, MEAN)
• Number of pulses to be measured
During the measurement, each pulse is mapped into a pixel of the screen, i.e. any change of the trace
can be detected only at the left-hand edge of the screen. Maximum measurement speed is as usual
achieved with the display switched off.
In the example below, a GSM pulse sequence of 8 pulses is measured with 5 µs trigger offset,
434 µs measurement time/pulse, video trigger with 50% trigger threshold, and peak detection: