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Brief Introduction to Remote Control
R&S
®
FSVA/FSV
157
Quick Start Guide 1321.3066.02 ─ 05
END SUB
REM *************************************************************************
7.2.2.3
Working with a Fixed Reference Point
The following example is based on a signal at 100 MHz with a level of -20 dBm.
Thus, the harmonics of the signal are located at 200 MHz, 300 MHz, etc. For
high-quality signal sources, these harmonics may be located outside the dynamic
range of the R&S
FSVA/FSV. Nevertheless, to measure the harmonic suppres-
sion, the level setting must be changed to higher sensitivity when measuring the
harmonics. In this case, it may be necessary to suppress the carrier by using a
notch filter in order to prevent the RF input of the R&S
FSVA/FSV from being
overloaded.
Thus, two measurements with different level settings are performed in the follow-
ing example. First, a high reference level is used on the carrier frequency, and
then a low reference level is used on the frequency of the third harmonic.
The default setting of the R&S
FSVA/FSV for measurements ("SetupInstrument")
is also used as a starting point here, after which adaptations for the measurement
are carried out.
REM *************************************************************************
Public Sub RefFixed()
Dim retCount as Long
CALL SetupInstrument 'Default setting
'--------- Measuring the reference point ----------------------------------
CALL InstrWrite(analyzer,"INIT:CONT OFF")
'Switch to single sweep
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,"INIT;*WAI") 'Perform sweep with sync
CALL InstrWrite(analyzer,"CALC:MARK:MAX")
'Set marker 1 to 100 MHz
CALL InstrWrite(analyzer,"CALC:DELT:FUNC:FIX ON")
'Define reference point
'----- Setting frequency, level and bandwidth for measuring harmonics ------
CALL InstrWrite(analyzer,"FREQ:CENT 400MHz;Span 1MHz")
'Set freq of 3rd harmonic
CALL InstrWrite(analyzer,"BAND:RES 1kHz")
'Set suitable RBW
Detailed Programming Examples
Содержание R&S FSV
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