Rohde & Schwarz CMU200 Service Manual

CMU Manual Test Procedure
1100.4903.82 1.13 E–4
TX Carrier/Sideband Suppression, Max. Distortion
The modulation quality of the analog IQ modulator of the CMU is measured.
Preparation Test setup TX5, no external trigger.
½ Connect spectrum analyzer to RF3 OUT.
Control: ½ Set CMU generator to specified RF frequency.
Output level at RF3 OUT, 0 dBm,
½ Switch on RF generator with offset modulation, 300- kHz baseband filter,
½ 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
mod
.
RX Power Meter (Frequency-Selective)
Preparation: Test setup RX1, RX2 (depending on level range).
Control: ½ Set CMU to desired RX frequency and level and Input in menu RF
ANALYZER/ GENERATOR.
Measuring Bandwidth = 1 kHz.
Test: ½ Measure RX level measurement accuracy of 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: ½ Set CMU to desired RX connector, frequency and level and Input in menu RF
Analyzer/ Generator.
Measuring Bandwidth = Wide
Test: ½ Measure RX level measurement accuracy of CMU.
Note: The given frequencies and levels are suggested values; of course, it is also possible to use
other values for the measurement.
RX Harmonics
Preparation: Test setup RX3,
Generator = f
in
; level = 0 dBm.
Control: ½ Set CMU to connector RF2, Max Level = 2 dBm.

Rohde & Schwarz CMU200 Specifications

General

Brand	Rohde & Schwarz
Model	CMU200
Category	Test Equipment
Language	English