User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN 83
Innomar Technologie GmbH (2023-01) 83
However, the external pulse can only become active if the previous cycle of transmitting and
sampling is finished. Otherwise, this external trigger pulse is neglected and only the next one can
cause the INNOMAR SBP to transmit its sound ping. The transmit cycle period is determined by
the selected range. Depending on the selected range and external trigger period, it may happen
that the INNOMAR SBP cannot ping with every trigger pulse. In this case the trigger information
“EXT” in the SESWIN status bar starts to flash yellow.
6.2.2 External Synchronisation with Delay
It is possible to apply an additional time delay between the incoming trigger event and the sound
ping transmission. This feature is useful if the triggering device (for instance a boomer) causes
noise in the INNOMAR SBP data at the moments it transmits the shot.
The delay can be specified as
absolute time in microseconds,
percentage of range,
percentage of external trigger period.
Please keep in mind that there is a fixed delay of about 1 ms before the sound ping is generated
in external synchronisation mode in any case, see above. With external trigger there is another
delay of 100 µs, which can be extended.
The figures below show the settings and trigger signals for a fixed delay set to 10 ms.
“Sync IN”
“Sync OUT”
Transducer Ping
“Sync IN”
“Sync OUT”
Transducer Ping
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