4.6 Trigger Setting
The trigger mode determines the sweep actuation of the channel at a trigger signal
detection. A channel can operate in one of the following three trigger modes:
nContinuous – a sweep actuation occurs every time a trigger signal
is detected;
nSingle – one sweep actuation occurs at one trigger signal
detection after the mode has been enabled, after the sweep is
complete the channel turns to hold mode;
nHold – sweep actuation is off in the channel, the trigger signals do
not affect the channel.
The trigger signal influences the whole Analyzer and controls the trigging of all the
channels in the following manner. If more than one channel windows are open, the
trigger activates the successive measurement of all the channels, which are not in hold
mode. Before the measurement of all the channels is complete, all the new triggers will
be ignored. When the measurement of all the channels is complete, if there is as least
one channel in continuous trigger mode, the Analyzer will turn to waiting for a trigger
The trigger source can be selected by the user from the following four available
nInternal – the next trigger signal is generated by the Analyzer on
completion of each sweep;
nExternal – the external trigger input is used as a trigger signal
nManual – the trigger signal is generated by pressing the
corresponding softkey.
nBus – the trigger signal is generated by a command
communicated from an external computer from a program
controlling the Analyzer via COM/DCOM.
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