Installation manual

Simrad SP90

140

851-164510 / Rev.E

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.