Simrad Simrad SP70, Installation Manual

Page: 149 / 230

Testing the peripheral equipment
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10.3 Speed log
Introduction
The speed log can come from three different sensor types. Tick off
for the type which will be connected.
•
Pulse log (200 pulses/nm)
•
Speed log (RS-232 serial line)
•
(D)GPS
Refer to the selected speed log source in the following text.
Pulse log (200 pulses per nautical mile)
The pulse log input shall be connected to terminal TB8 inside the
Sonar Interface Unit.
Observe the following procedure to test the pulse log input:
1 Access the I/O Setup menu.
2 Select Sensors in the I/O Setup menu, then Speed and
finally Speed Log .
3 Check that the settings in the Sensor Config menu
correspond to the sensor settings table. Note that the pulse
log must use serial port no.9.
4 Press Close to exit the Sensor Config menu.
5 Check that the speed readout in the Status menu corresponds
to the vessel’s speed log.
The pulse log connection and interface circuit is located in the
Sonar Interface Unit.
An oscilloscope can be connected to the test point
TP33 to check
if the pulse log signal is present through the comparator IC30
(
TP34 is GND). If not, try to adjust the potentiometer R64. In case
of noise problems, R64 can be adjusted for noise limitation.
Related topics
→
Location of TB8, page 77.
→
Access to the I/O Setup, page 130.
→
Sensor settings table, page 130.
→
Pulse log interface, page 78.
Speed log with RS-232 serial line
Observe the following procedure to test the speed log input: