Rohde & Schwarz SMM100A, User Manual

Page: 447 / 1088

Multi-instrument setups
R&S
®
SMM100A
447 User Manual 1179.1341.02 ─ 05
3. To compensate signal delay, select "I/Q Modulator > I/Q Digital Impairments"
4. Vary the value of the parameter "I/Q Delay" to achieve time aligned signals.
5. If the value range is insufficient, enable also or alternatively a trigger delay.
Select "Baseband > <Dig Standard> > Trigger In" > "Delay" .
6. Vary the values until the signals align in time.
9.2.1.3 Further information
See:
●
Trigger settings of the used baseband source, for example Chapter 4.4.2.1, "Trig-
ger settings" , on page 109.
See also Chapter 11.2, "Configuring local and global connectors" , on page 527.
9.2.2 Triggering several instruments with a common trigger signal
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 SMM100A generate a dedicated signal that triggers all
R&S SMM100A instruments.
See Example "Triggering several R&S SMM100A instruments simultaneously"
on page 447.
●
Connect all instruments to a common external trigger source.
See Chapter 3.3.4, "Enabling and configuring a marker signal" , on page 57.
Example: Triggering several R&S SMM100A instruments simultaneously
This example shows you how to connect several R&S SMM100A, distribute the trigger
signal generated by the first one (R&S SMM100A#1) and trigger the instruments simul-
taneously.
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
SMM100A#1 to the User 3 input of
all other R&S SMM100A and the R&S SMM100A#1 itself.
●
Always use cables of the same length.
Use as short as possible cables.
Required configurations:
●
In all R&S SMM100A:
Generating time-aligned baseband signals