Neurosoft Neuron-Spectrum-61 Technical Manual page 95

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Annex 3. Trigger Input/Output
The top side panel of the Neuron-Spectrum electronic unit provides a trigger socket
(3, Fig. 7) for the attachment of third party stimulators.
The devices connected to the trigger socket must have protection class against elec-
trical shock according to IEC 60601-1.
Cables for connection of third party devices are not included into delivery set and
must be produced according to the recommendations stated in this Annex.
The trigger socket is a three-pin plug of 2.5 mm diameter. It is used as a trigger input
to synchronize the program with external stimulus and as trigger output to transfer
the pulse synchronously with the work of internal stimulators. The socket schematic
and triggering pulse parameters are described in Fig. 56.
If the trigger input is used, then negative polarity TTL pulse not less than 100 µs must
be at the input. The pulse droop will be considered as the beginning of synchroniza-
tion. The synchronization signal is also generated by short-circuit of input to common
wire for not less than 100 µs.
When the trigger output is used, with each stimulus, negative polarity TTL pulse ap-
pears at the connector which fall corresponds to the beginning of the stimulus.
Pulse duration for photic and pattern stimulation at the trigger output is 1±0,05 ms
(Т in Fig. 56):
Fig. 56. Socket schematic and specifications of triggering pulse
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