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SeaBat T-Series Subsea Operator's Manual
Page 114
January 31, 2019
Version 7
50 Ohm
470 Ohm
1K Ohm
PPS in delay
PPS delay (ns)
PPS source voltage (V)
Figure 67: PPS In Delay
D.3
Hints and Advice
The PPS and trigger inputs work with regular CMOS TTL outputs.
The drive capability of a standard TTL output is inadequate to drive PPS and trigger high.
When more systems use the same PPS source using BNC-T-adaptors it should be
verified that its drive capability is sufficient.
For distribution of the PPS pulse, "PPS out" may be used instead of the BNC-T-adaptor.
Make sure the PPS source output is in accordance with the specifications listed in
.
Operation is ensured if the source resistance is less than 470 Ohm, the drive voltage
is greater than 3V,
and
the pulse width is greater than 1µs.
The PPS/trigger described is the externally available signal. The signal is conditioned before it is
internally distributed.
PPS/Trigger
conditioning circuit
TRIG IN/
PPS IN *
Internal sonar
distribution
* The TRIG IN//PPS IN (or 1PPS) ports are clearly
marked on the rear panel of the sonar processor.
Figure 68: PPS/Trigger Signal
NOTE
The pulse width reported by the IO module is NOT the pulse width of the incoming signal at the
TRIG IN/PPS IN
34
ports.
34
The “PPS IN” connection may also be called “1PPS”.
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