User's Guide ______________________________________________________________________
84 __________________________________________________________________ M210482EN-B
Accessing the Diagnostic Information
During normal operation, CL31 continuously monitors its internal
status and regularly checks the blower and the heater. CL31 analyzes
the diagnostic test results automatically and reports potential failures
with every data message. Refer to section CT25K Data Messages on
page 60.
CL31 identifies the potentially faulty subassemblies automatically. If
this does not help you to find the origin of the fault and restore the
ceilometer back to normal operation, refer to Table 18 on page 86,
Table 19 on page 88, and Table 20 on page 89 for probable causes of
warnings, alarms, and other typical faults. You can also refer to these
tables to rule out any problems related to cable connections or the
clarity of the window or optical path.
Equipment
To establish a service connection to the CL31 you need to have a
maintenance terminal which can be a palmtop computer with an RS-
232 Interface or a PC with serial interface, Maintenance cable
QMZ101, and any terminal program. The CT-VIEW software can be
used for this purpose. Also, if you perform the operation check
indoors, you need to have an Optical Termination Hood
(CLTERMHOOD) which absorbs the laser light that would otherwise
reflect from the ceiling and possibly saturate the receiver.
If data messages are not needed, for example, if the ceilometer is out
of use, the maintenance connection can also be established through the
data line. This will, however, cause the data flow to be discontinued
for as long as the command line is kept open.
Troubleshooting Instructions
To check the normal operation of CL31, proceed as follows:
1.
Clean the window carefully with a soft, lint-free cloth moistened
with a mild detergent. Be careful not to scratch the window
surface.
2.
If you are indoors, put the optical termination hood (the black
hat) on the ceilometer window. To the ceilometer this
corresponds to a clear, nighttime sky.
