Campbell OBS-3A Spécifications télécharger pdf (Page 30)

Section 4. Troubleshooting

4. The OBS-3A and PC are not set to the same baud rate or communication

protocol (e.g. RS-232, USB, RS-485).

x Click

and check port settings on the serial port tab. The default

baud rate is 115.2 kb. If the PC is not set to this speed, follow the

steps in Section 3.4 to set it.

x If the OBS-3A still fails to respond, try changing PC speeds and

clicking

until communication is established (e.g. 57.6, 38.4, 19.6,

9.6 kb, etc.). If this fails, switch the PC back to 115.2 kb and go to the

next step.

x Reconnect the cable and try

x Replace the main batteries; see Section 2.2 and try

x If you have a survey cable, connect instrument to external power and

try

x Remove the unit from the pressure housing and press and release the

RESET button. Try

Power failed due to battery clip corrosion or a broken power wire.

Check for a broken red wire connecting the battery tube and circuit board.

Green powder or tarnish on the battery contact parts indicates salt-water

corrosion. Remove the electronics from the pressure housing. Pull battery-

clip-retainer pin out with needle-nose pliers and slide the clip from its track.

Clean the corroded surfaces of clip and track with a Scotch-brite

pad and

reassemble unit.

OBS or other sensor malfunction.

x Inspect for physical damage such as a broken or bent thermistor, a dirty

conductivity sensor, or an OBS sensor fouled with marine growth.

x Open unit and inspect for broken sensor and communication wires and

loose connectors (FIGURE 3.19-1).

x Check sensor power by starting Survey mode

and selecting all

sensors. Green LEDs should illuminate for installed sensor.

x If the depth sensor reads high and does not change, it may need to be

cleaned (see pressure-sensor maintenance, Section 5.2).

x If the sensors appear to be in working order, the digitizer or

microcontroller may be damaged. Such problems usually require factory

service.

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Campbell OBS-3A Spécifications Page 30