Testing with Option B90 (Mimo) enabled R&S SMU200A
1007.9845.82 1.80
E-12
Testing with Option B90 (Mimo) enabled
If the DUT is equipped with Option B90 the function of the LO_in_ext and LF_out_ext have to be
verified. Also some of the tests which are always conducted have to be performed additionally in the
coupled mode of the local oscillator. Option B90 requires a DUT with two paths, i.e the additional tests
for B90 have to be performed for both paths. In the coupled mode the IQ modulator has to to be
switched on and a an input has to be applied to the IQ modulator. If the test doesnot require a IQ
modulator input anyhow, this Input can be provided by a single carrier MCCW from the baseband if
installed, otherwise it can be provided by a single carrier MCCW input from an external IQ modulation
source. The Scpi commands to bring the DUT into this state are:
SOUR:BB:MCCW:CARR:COUN 1
SOUR2:BB:MCCW:CARR:COUN 1
SOUR:BB:MCCW:STAT ON
SOUR2:BB:MCCW:STAT ON
FREQ:LOSC:MODE COUP
When setting the RF frequency for Path B in coupled mode, it has to be taken into account that in this
mode the RF frequencies are coupled and set for both paths when the RF frequency for path A is set.
Commands for setting the frequency on path B are ignored in coupled mode.
Additional tests with B90
LO_out_ext
Test equipment Frequency counter (Table 1-2, item 1)
Test method The frequency of the LO_out_ext is checked using a frequency counter
whose reference frequency is in sync with that of the DUT..
Measurement Synchronize the reference frequencies of the DUT and the analyzer.
Connect LO_out_ext to Frequency counter
Settings on DUT:
- Apply Single Carrier MCCW to IQ modulator
- Frequency: test frequency unmodulated, recommended
requencies: according to Table 1-4
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