Multi-instrument setups
R&S
®
SMM100A
445
User Manual 1179.1341.02 ─ 05
Sync/Trig. Signal
1
RF
User 5
User 5
Ref. Out
Ref. Out
RF
User 5
User 4
Ref. In
User 5
User 5
Ref. In
Ref. Signal
User 5
User 4
RF
2
2
Ref. Signal
Sync/Trig. Signal
Figure 9-1: Example: Daisy chain connection for distributing the synchronization signal (simpli-
fied)*
*
= I/Q, LAN etc. connections are not shown
1
= Primary instrument acting as synchronization and trigger signal source
2
= Secondary instruments: One or more cascaded instruments, receiving (and forward-
ing) the synchronization and trigger signal
Ref Out, Ref
In
= Reference frequency connectors
User x
= Synchronization and trigger signal connectors
RF
= RF signal output connector
● Connect
User 6
connector of the primary instrument R&S
SMM100A to
User 5
connector of the first secondary instrument.
● Connect User 6 connector of the first secondary instrument to the User 5 con-
nector of the second secondary instrument, etc.
Note:
Avoid unnecessary cable length and branching points.
Use cables of the same length and type for all connections between the primary
instrument and the secondary instruments and between secondary instruments.
2. To distribute the internal reference signal of one of the instruments (in this example
the primary instrument), connect the instruments in a
concerning the
reference frequency
.
That is, connect Ref Out of the primary instrument R&S
SMM100A to the Ref In of
the first of the secondary instrument group, etc.
See
Chapter 7.9, "Reference oscillator"
Configure the primary instrument (R&S
SMM100A)
1. Select "RF > Reference Frequency > Source > Internal".
2. Select "System Config > System Config > Multi Instruments".
3. Select "Multi Instrument Trigger" >
"Primary"
.
4. Select "State > On".
5. In the "Global Connector Settings" dialog, and observe current signal assignment.
Per default, the synchronization signal ("Baseband Sync Out") is output at the
User
6
.
6. Configure the baseband signal as required for the particular test setup.
Configure the trigger signal, for example, as follows:
Generating time-aligned baseband signals
