R&S FSL Fast Power Measurement on Power Ramps
1300.2519.12 7.15 E-11
'––––––––––––––––––– Perform measurement and query results ––––––––––––––––
CALL InstrWrite(analyzer,"INIT;*WAI") 'Perform sweep with sync
'Query results:
query$ = " CALC:MARK:FUNC:SUMM:PPE:RES?;" 'Peak measurement
query$ = query$ + ":CALC:MARK:FUNC:SUMM:MEAN:RES?;"
'
Mean measurement
query$ = query$ + ":CALC:MARK:FUNC:SUMM:RMS:RES?;"
'RMS measurement
query$ = query$ + ":CALC:MARK:FUNC:SUMM:SDEV:RES?"
'Standard deviation
CALL InstrWrite(analyzer, query$)
CALL InstrRead(analyzer, result$)
Print result$
END SUB
REM
************************************************************************
Fast Power Measurement on Power Ramps
A frequent task in mobile radio tests is measurement of a DUT at various power control levels at the
highest possible speed. The R&S FSL offers two test functions for this task, which can be used
depending on the signal characteristics.
In the following, the two methods are presented by means of two examples.
Power Measurement with Multi–Summary Marker
The multi–summary marker function is suitable for measuring the power of a sequence of pulses with
the following characteristics:
• The pulses occur at identical time intervals, which is typical of GSM transmission in slots, for
example.
• The level of the first signal is reliably above threshold.
• The subsequent pulses may have any levels.
The function uses the first pulse as a trigger signal. The power of the subsequent pulses is determined
exclusively via the timing pattern selected for the pulse sequence. The function is, therefore, suitable for
adjustments where the DUT output power varies considerably and is not reliably above the trigger
threshold.
The measurement accuracy is determined by the ratio of pulse duration to total measurement time; this
should not be below 1:50.
The function always uses TRACE 1.
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