Manual Test Procedure R&S CMU
1100.4903.82 1.14 E-5
TX Carrier/Sideband Suppression, Max. Distortion
The modulation quality of the analog IQ modulator of the R&S CMU is measured.
Preparation Test setup TX5, no external trigger.
Connect spectrum analyzer to RF3 OUT.
Control: Set R&S CMU generator to specified RF frequency.
Output level at RF3 OUT, 0 dBm,
Switch on RF generator with offset modulation, 300- kHz baseband filter,
Set analyzer to center frequency f
c
= 1000 MHz, Span = 300 kHz / 3 MHz
Test: The suppression of the carrier at f
c
is measured relative to the useful sideband
signal at f
c
+ f
m
od
.
RX Power Meter (Frequency-Selective)
Preparation: Test setup RX1, RX2 (depending on level range).
Control: Set R&S CMU to desired RX frequency and level and Input in menu RF
ANALYZER/ GENERATOR.
Measuring Bandwidth = 1 kHz.
Test: Measure RX level measurement accuracy of R&S CMU.
Note: The given frequencies and levels are suggested values; of course, it is also possible to use
other values for the measurement.
RX Power Meter (Wideband)
Preparation Test setup RX1, RX2 (depending on level range).
Control: Set R&S CMU to desired RX connector, frequency and level and Input in
menu RF Analyzer/ Generator.
Measuring Bandwidth = Wide
Test: Measure RX level measurement accuracy of R&S CMU.
Note: The given frequencies and levels are suggested values; of course, it is also possible to use
other values for the measurement.
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