3.2 I/O Terminals
15
IM FG410-01EN
• Gate of gated oscillation
• Triggered gate oscillation trigger
• Sequence oscillation start trigger
)
“6.2 Basics” in the Application Instruction Manual
TRIG IN can also be used as the external modulation input for FSK and PSK
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Input Characteristics
3.2.5 External 10 MHz frequency reference input (10 MHz REF IN)
10 MHz REF IN can be used for the following purposes.
■
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.
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Input Characteristics
Input voltage
TTL level (low: 0.8 V or lower; high: 2.6 V or higher)
Maximum allowed input
−0.
5 V to +5.5 V
Input impedance
10 k
Ω
, pull up to +3.3 V
Signal GND
Same potential as housing
Input voltage
0.5 Vp-p to 5 Vp-p
Maximum allowed input 10 Vp-p
Input impedance
1 k
Ω
, AC coupled
FG420
FG410
10MHz REF IN
[Insulated from housing]
10MHz REF IN
[Insulated from housing]
