Zebra-Tech Ltd
D-OptoLogger Operation Manual
16
Appendix 4: Trouble shooting
The PC starts to communicate with the D-Opto Logger, but then looses
communication.
•
Replace the D-Opto Logger battery
The D-Opto Logger is not communicating with the PC
•
Check the battery voltage.
•
Check the communications cable is plugged into the correct serial port on
the PC
Dissolved oxygen readings are highly erratic, but temperature readings are
stable.
The D-Opto Logger incorporates a high gain amplification circuit to measure the
fluorescence of the optical window. The instrument has been carefully designed
to prevent electrical interference impacting on the operation. Under extreme
conditions however, noise may become a problem.
•
Track down the source of noise; this could be a nearby pump or other
motor.
•
If the D-Opto Logger is being bench tested in a small container of water,
noise can be caused by a lack of suitable earthing. Place a grounding wire
from the water to the D-Opto Logger power ground.
•
The D-Opto Logger is supplied with built in noise rejection specific for the
country of supply. If the D-Opto Logger is being used in a country other
than the country it was supplied to, contact your supplier.
The last data record in the data file consists of zero values.
•
The D-Opto Logger battery ran critically flat.
