Averaging I/Q Data - Rohde & Schwarz R&S FSP Series Operating Manual

R&S FSP
status = viRead(analyzer, result$, 6553600, retCnt)
status = viWrite(analyzer, "TRAC:IQ:STAT OFF", 16, retCnt)
'Stop I/Q data aquisition mode if no further measurements are
'to be done
END SUB
REM ************************************************************************
7.3.10
---''''''''
The R&S FSP has averaging capability also for I/Q measurements, i.e. I/Q data can
be averaged over several test runs. This is subject to the following conditions:
1. An external trigger signal must be available for data measurement, and the trigger
2. The same reference-frequency signal must be used for the DUT and the
3. The sampling rate must be 32 MHz, since only with this sampling frequency will
If all of the above conditions are fulfilled, no phase shift will occur between consecu-
tive test runs. Phase shift may invalidate the measured average so that in extreme
cases a value of 0 is obtained.
The default setting of the instrument for data measurement without averaging has to
be changed as follows:
'--------- R&S FSP default setting ---------------------------------------
CALL SetupInstrument
'Default setting
status = viWrite(analyzer, "TRAC:IQ:STAT ON", 15, retCnt)
'Activate I/Q data acquisition mode;
'this must be done before TRAC:IQ:SET!
'Select max. number of test points (= 128 * 1024 – 512) at
'10 MHz RBW, 32 MHz sampling rate, external trigger, pos.
'trigger edge and 0 s trigger delay.
status = viWrite(analyzer, "TRAC:IQ:SET NORM,10MHz,32MHz,EXT,POS,0,130560",
45, retCnt)
status = viWrite(analyzer, "TRAC:IQ:AVER ON", 15, retCnt)
'Switch on I/Q averaging
status = viWrite(analyzer, "TRAC:IQ:AVER:COUN 10", 20, retCnt)
'Set 10 test runs
'--------- Read data in binary format -------------------------------------
...
Operating Manual 1164.4556.12 - 06

Averaging I/Q Data

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signal must be phase-locked to the signal measured.
R&S FSP.
the measurement be performed phase-synchronous with the trigger signal.
Remote Control – Programming Examples
More Complex Programming Examples
7.27