Rohde & Schwarz R&S FSL3 - Page 1646

Fast Power Measurement on Power Ramps R&S FSL
1300.2519.12 7.18 E-11
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:
REM ************************************************************************
Public Sub MultiBurstPower()
result$ = Space$(200)
'––––––––– R&S FSL default setting ––––––––––––––––––––––––––––––––––––––––
CALL SetupStatusReg 'Configure status register
CALL InstrWrite(analyzer,"*RST") 'Reset instrument
CALL InstrWrite(analyzer,"INIT:CONT OFF") 'Single sweep mode
CALL InstrWrite(analyzer,"SYST:DISP:UPD OFF")
'OFF: display off
'––––––––– Perform measurement and query results –––––––––––––––––––––
cmd$ = "MPOW? "
cmd$ = cmd$ + "935.2 MHZ," 'Center frequency
cmd$ = cmd$ + "1MHZ," 'Resolution bandwidth
cmd$ = cmd$ + "434US," 'Measurement time
cmd$ = cmd$ + "VID," 'Trigger source
cmd$ = cmd$ + "50PCT," 'Trigger threshold
cmd$ = cmd$ + "1US," 'Trigger offset, must be > 125 ns
cmd$ = cmd$ + "PEAK," 'Peak detector
cmd$ = cmd$ + "8" 'Number of bursts
CALL InstrWrite(analyzer, cmd$)
CALL InstrRead(analyzer, result$) 'Read results
Print result$
END SUB
REM ************************************************************************