Controlling the R&S FSVA/FSV Remotely
R&S
®
FSVA/FSV
154Quick Start Guide 1321.3066.02 ─ 06
Measuring Noise and Phase Noise
When phase noise is measured, the noise power related to a bandwidth of 1 Hz is
set in relation to the power of an adjacent carrier signal. A commonly used offset
between the measured frequency and the carrier frequency is 10 kHz.
When noise is measured, the measured absolute level is related to a bandwidth
of 1 Hz.
The following example is also based on a signal at 100 MHz with a level of -30
dBm. Two markers are used to determine both the noise and the phase noise at a
10 kHz offset from the carrier signal.
REM ************************************************************************
Public Sub Noise()
Dim retCount as Long
'--------- Default setting of the R&S FSV --------------------------------
CALL SetupStatusReg 'Configure status register
CALL InstrWrite(analyzer,"*RST") 'Reset instrument
CALL InstrWrite(analyzer,"INIT:CONT OFF")
'Single sweep mode
'--------- Setting the frequency ------------------------------------------
CALL InstrWrite(analyzer,"FREQUENCY:CENTER 100MHz")
'Center frequency
CALL InstrWrite(analyzer,"FREQ:SPAN 100 kHz")
'Span
'--------- Setting the level ----------------------------------------------
CALL InstrWrite(analyzer,"DISP:WIND:TRAC:Y:RLEV -20dBm")
'Reference level
CALL InstrWrite(analyzer,"INIT;*WAI") 'Perform sweep with sync
'--------- Setting the reference point ------------------------------------
CALL InstrWrite(analyzer,"CALC:MARK:PEXC 6DB")
'Define peak excursion
CALL InstrWrite(analyzer,"CALC:MARK:STAT ON")
'Activate marker 1
CALL InstrWrite(analyzer,"CALC:MARK:TRAC 1")
'Set marker 1 to trace 1
CALL InstrWrite(analyzer,"CALC:MARK:MAX")
'Set marker 1 to 100 MHz
CALL InstrWrite(analyzer,"CALC:DELT:FUNC:PNO ON")
'Define reference point for phase noise
'--------- Measuring the phase noise --------------------------------------
CALL InstrWrite(analyzer,"CALC:DELT:X 10kHz")
'Position delta marker
CALL InstrWrite(analyzer,"CALC:DELT:FUNC:PNO:RES?")
'Query and output phase noise result
result$ = Space$(100)
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