Multi-Instrument Setups
R&S
®
SMW200A
608User Manual 1175.6632.02 ─ 16
For information on the possible scenarios, test setups and the related settings, see
Chapter 7.5, "Local Oscillator Coupling", on page 448
9.3 Generating Time-Aligned Baseband Signals
In test setups that combine the signal of two or more instruments and/or basebands it
is often required that:
●
The signal generation starts at a defined moment
●
The signal generation starts simultaneously (or with an exactly defined delay) in:
– All involved instruments
– All basebands of the same R&S SMW
One possible way to achieve quasi-simultaneous signal start is to trigger the instru-
ments by the same trigger event, for example from a common trigger source.
Because of the trigger signal propagation time and the signal processing time, how-
ever, this method does not achieve precise time aligned signals.
To generated synchronous and time aligned signals with multiple instruments, use
the master-slave mode.
This section explains how to use the provided settings to define the signal generation
start in the basebands of multiple instruments.
For information on simultaneous signal generation in the basebands of the same
R&S SMW, see "Simultaneous Signal Generation Start in All Basebands" on page 245.
● Connecting Multiple Instruments in Master-Slave Mode.......................................608
● Triggering Several Instruments with a Common Trigger Signal............................614
9.3.1 Connecting Multiple Instruments in Master-Slave Mode
About the master-slave mode
When connected in master-slave mode, two or more R&S SMW or one R&S SMW and
several other signal generators such as R&S SGT or R&S SMBV can generate syn-
chronous and time aligned signals.
In this mode, the master instrument generates and outputs a dedicated synchroniza-
tion signal (Sync Out), that has to be fed into the slave instrument. The slave instru-
ment detects and demodulates the signal, and retrieves both the baseband clock and
the trigger signal from it. Slave instruments can forward the received synchronization
signal (Sync In) and output it to trigger further slaves.
Synchronization signal
The synchronization signal is a 50 MHz signal that carries the trigger pulse modulated
on it. Hence, it provides joint triggering and baseband clock synchronization at the
same time.
Generating Time-Aligned Baseband Signals
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