Multi-Instrument Setups
R&S
®
SMW200A
640User Manual 1175.6632.02 ─ 30
For information on the possible scenarios, test setups and the related settings:
See Chapter 8.6, "Local Oscillator Coupling", on page 482.
10.3 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 primary-secondary instrument 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 243.
● Connecting Multiple Instruments in Primary-Secondary Instrument Mode........... 640
● Triggering Several Instruments with a Common Trigger Signal............................648
10.3.1 Connecting Multiple Instruments in Primary-Secondary Instrument
Mode
About the primary-secondary instrument mode
When connected in primary-secondary instrument 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 synchronous and time aligned signals.
In this mode, the primary instrument generates and outputs a dedicated synchroniza-
tion signal (Sync Out), that has to be fed into the secondary instrument. The secondary
instrument detects and demodulates the signal, and retrieves both the baseband clock
and the trigger signal from it. Secondary instruments can forward the received synchro-
nization signal (Sync In) and output it to trigger further secondary instruments.
Generating Time-Aligned Baseband Signals
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