YOKOGAWA FG420 - Page 138

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IM FG410-01EN
4. BASIC OPERATION
f) Triggersettingsfortriggeredgateoscillation
The trigger can be selected from internal trigger oscillator, external signal, manual trigger key
manipulation, and remote trigger manipulation.
Upon receipt of a trigger, the TRIG’D lamp next to the MAN TRIG key lights.
The trigger source is set with [Trig] (trigger) on the 2nd page of the setting screen. The trigger delay
is fixed to minimum.
 Triggersourcesetting
The trigger source can be chosen from [Int] (internal) and [Ext] (external).
When the trigger source is [Int] (internal), the trigger period can be set.
When the trigger source is [Ext] (external), the trigger polarity can be set.
If the trigger source is set to [Ext] (external), a TTL level trigger signal is input to the external
trigger input terminal (TRIG IN).
Usage of manualtriggerandremotetrigger
Manual trigger manipulation and remote trigger manipulation are always valid regardless of the
trigger source setting.
The
MAN TRIG
MAN TRIG key can be used for manual trigger manipulation.
However, in the case of the FG420, the MAN TRIG key works for the channel whose display is
active.
For details on the channel whose display is active,

p.42 .
To use only manual trigger manipulation and remote trigger manipulation as the trigger, set the
trigger source to [Ext] (external). Also, to prevent malfunction due to external noise at this time,
it is recommended to set the polarity to [Off].
g) Tostarttriggeredgateoscillation→Trigger
Oscillation is executed upon reception of a trigger if the internal gate signal is on.
The trigger can be selected from internal trigger oscillator, external signal, manual trigger
manipulation, and remote trigger manipulation.
h) Tooutputtheburstsyncsignal→Syncoutputsetting
This setting is done with [SyncOut] (sync output) on the 2nd page of the setting screen. One of the
following two settings can be selected.
• Signal synchronized with the reference phase of the waveform [Sync]
• Signal synchronized with burst oscillation [BrstSync]
 When[Sync]isselected
A TTL level signal that rises at the reference phase of the waveform is output from the sync/sub-
output terminal.
 When[BrstSync]isselected
A TTL level signal synchronized with the gate oscillation is output from the sync/sub-output
terminal. As shown in the following figure, this signal is low during oscillation and high during
oscillation stop. Note that this differs from the gate signal.
When the signal during burst is observed with an oscilloscope, it can be used as the trigger signal
for the oscilloscope.