Hints And Advice; Figure 67: Pps In Delay; Figure 68: Pps/Trigger Signal - Teledyne SeaBat T Series Operator's Manual

PPS IN AND TRIGGER IN
PPS delay (ns)
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 Table 21.
 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.
TRIG IN/
PPS IN *
* The TRIG IN//PPS IN (or 1PPS) ports are clearly
marked on the rear panel of the sonar processor.
The pulse width reported by the IO module is NOT the pulse width of the incoming signal at the
TRIG IN/PPS IN
34 The "PPS IN" connection may also be called "1PPS".
SeaBat T-Series Subsea Operator's Manual
Version 7
PPS in delay
PPS source voltage (V)

Figure 67: PPS In Delay

PPS/Trigger
conditioning circuit

Figure 68: PPS/Trigger Signal

34 ports.
NOTE
Page 114
50 Ohm
470 Ohm
1K Ohm
Internal sonar
distribution
January 31, 2019