Rohde & Schwarz FSVA - 4.3.8 Fast Level Measurement Using Frequency Lists

Remote Control
R&S
®
FSVA/FSV
1030Operating Manual 1176.7510.02 ─ 09
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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 ms trig-
ger offset, 434 ms measurement time/pulse, video trigger with 50 % trigger threshold,
and peak detection:
REM ************************************************************************
Public Sub MultiBurstPower()
result$ = Space$(200)
'--------- R&S FSV default setting ----------------------------------------
CALL SetupStatusReg 'Configure status register
CALL InstrWrite (analyzer, "*RST") 'Reset instrument
CALL InstrWrite (analyzer, "INIT:CONT OFF") 'Single sweep mode
CALL InstrWrite (analyzer, "SYST:DISP:UPD OFF")
'OFF: display off
'--------- Perform measurement and query results ---------------------
cmd$ = "MPOW? "cmd$ = cmd$ + "935.2 MHZ," 'Center frequency
cmd$ = cmd$ + "1 MHZ," 'Resolution bandwidth
cmd$ = cmd$ + "434US," 'Measurement time
cmd$ = cmd$ + "VID," 'Trigger source
cmd$ = cmd$ + "50PCT," 'Trigger threshold
cmd$ = cmd$ + "1US," 'Trigger offset
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 ************************************************************************
4.3.8 Fast Level Measurement Using Frequency Lists
A typical task for the R&S FSVA/FSV is power measurement at a number of frequency
points, e.g. at multiples of the fundamental (harmonics measurement), or at frequen-
cies defined by a mobile radio standard (e.g. spectrum due to transients at ± 200 kHz,
± 400 kHz, etc about the carrier frequency of a GSM signal). In many cases, different
level and/or bandwidth settings are required for the different frequency points to match
the channel spacing and meet the requirements of dynamic range.
Especially for this application, the R&S FSVA/FSV offers a number of remote-control
functions (commands available in SENSe:LIST subsystem) that allow level measure-
ment based on a frequency list with different instrument settings assigned to different
frequencies. Not only the frequency list can be programmed, but also the measure-
ment types (PEAK, RMS, AVG) to be performed simultaneously can be selected.
The example below describes a harmonics measurement on a dual-band amplifier.
The harmonics level in general decreases as the frequency increases. To boost mea-
Remote Control – Programming Examples