Multi-Instrument Setups
R&S
®
SMW200A
614User Manual 1175.6632.02 ─ 16
Observe the generated signals.
2. Compare the signal start in the instruments.
3. To compensate signal delay, select "I/Q Modulator > I/Q Digital Imperilments"
4. Vary the value of the parameter "I/Q Delay" to achieve time aligned signals.
5. If the value range is insufficient, enable additionally or alternatively a trigger delay.
Select "Baseband > <Dig Standard> > Trigger In" > "Delay".
6. Vary the values until the signals are aligned in time.
9.3.1.3 Further Information
See:
●
Trigger settings of the used baseband source, for example Chapter 4.5.2.1, "Trig-
ger Settings", on page 253.
●
Chapter 11.2.5, "Global Connectors Settings", on page 669
9.3.2 Triggering Several Instruments with a Common Trigger Signal
The configuration described in this section is useful, in the following cases:
●
R&S SMW is equipped with standard baseband generator
●
Or master-slave mode is not used or possible
Using the same trigger event on several instruments is useful to synchronize the trans-
mitted and received signals. Some test cases also require that you control the signal
generation start and determine the exact generation start time by a defined trigger
event. The signal generation start can be controlled for example by triggering the
instrument internally or externally from the DUT.
To share common trigger signal:
●
Let one R&S SMW generate a dedicated signal that triggers all R&S SMW instru-
ments.
See Example "Triggering several R&S SMW instruments simultaneously"
on page 614.
●
Connect all instruments to a common external trigger source.
See Chapter 2.3.3, "Triggering the Instrument with an External Signal", on page 71.
Example: Triggering several R&S SMW instruments simultaneously
This example shows you how to connect several R&S SMW, distribute the trigger sig-
nal generated by the first one (R&S SMW#1) and trigger the instruments simultane-
ously.
Required cabling and connections:
●
Connect the instruments in a star network, concerning the trigger signal.
That is, connect the USER 6 output of the R&S SMW#1 to the USER 3 input of all
other R&S SMW and the R&S SMW#1 itself.
Generating Time-Aligned Baseband Signals
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