YOKOGAWA FG420, User Manual

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18 IM FG410-01JA
3. PANELS AND I/O TERMINALS
When frequency accuracy higher than the frequency accuracy specification of the
equipment is required, or when the frequency reference of a different signal generator
is desired
Input the 10 MHz reference signal output from an external frequency standard or another signal
generator.
Enable external frequency reference setting.

“5. USING EXTERNAL FREQUENCY REFERENCE” in the Application Instruction Manual
To unify the frequency and phase for multiple FG410, FG420 units
Connect the frequency reference output of the master unit when multiple units are combined in
synchronous connection, or the master FG410 or FG420, to the external 10 MHz frequency reference
input of the FG410 or FG420.
Set the frequency setting of each unit to the same value.
Also enable external frequency reference setting for the slave units and perform phase synchronization
with the master unit.

“4. SYNCHRONIZING MULTIPLE UNITS” in the Application Instruction Manual
The frequency accuracies of the connected FG410 and FG420 units are all the same as that of the
master unit.
An external frequency standard can also be used for the master unit.
Input Characteristics
Input voltage 0.5 Vp-p to 5 Vp-p
Maximum allowed input 10 Vp-p
Input impedance
1 k
Ω
, AC coupled
Input frequency 10 MHz ( ±0.5% ( ±50 kHz))
Input waveform Sine or square (50 ±5% duty)
Signal GND Insulated from housing and each channel waveform output (42 Vpk max.)
3.2.6 Frequency reference output (REF OUT)
FG420 FG410
REF OUT REF OUT
Use REF OUT to unify the frequency and phase for multiple FG410, FG420 units.
Connect the frequency reference output of the master unit when multiple units are combined in
synchronous connection, or the master FG410 or FG420, to the external 10 MHz frequency reference
input of the FG410 or FG420.

“4. SYNCHRONIZING MULTIPLE UNITS” in the Application Instruction Manual