NF WAVE FACTORY WF1967, Инструкция по эксплуатации, Страница: 222 / 330

9.1 Connection Procedure
WF1967/WF1968 9-2
Synchronizing multiple units of WF1967 or WF1968 can configure up to 12-phase oscillators (for 6 units
of WF1968) without using sub waveform. You can change a phase and amplitude for each phase
independently.
Set the same frequency for all units and channels.
9.1 Connection Procedure
WF1967 or WF1968 as the synchronous reference is called a "master unit." Other WF1967 or WF1968 is
called a "slave unit."

Used connectors
External 10MHz frequency reference input (10MHz REF IN) and frequency reference output (REF
OUT) on the rear panel are used.

Cables used for connection
Cable type: Characteristic impedance 50Ω series coaxial cable with BNC connector (RG-58A/U etc.)
Restriction to cable length: 1m or less between units, total cable length is 3m or less

Connection method
There are two types of connection methods (connection method 1 and connection method 2).
If the number of units is many, using the connection method 1 can reduce the time difference between
slave units. However, in addition to the coaxial cable, T-
type divider and 50Ω terminating resistor are
required.
The connection method 2 is easy to connect because it can make the connection using only coaxial
cable. However, the time difference between slave units is larger than that of the connection method 1.
The maximum connection number of units is fewer than that of the connection method 1.
Any of the built-in crystal oscillator or external 10MHz clock can be used as the frequency reference
for the master unit. If you use the external 10MHz as the reference, the frequency of the slave unit will
also be the same accuracy as the external reference.
• Connection method 1
Connect the reference output for the master unit to the reference input for the slave unit in parallel
using the T-type divider.
Use the 50Ω terminating resistor for the reference input for the terminal slave unit.
Time difference between slave units varies depending on the connection cable length
(approximately 5ns/m).
The maximum number of 6 units can be connected, including master and slave units.
Master unit
External reference
can be used
Slave unit
Slave unit Slave unit
50Ω termination
resistor
T-shaped divider T-shaped divider