Ceilometer CT25K
CT25K-U059en-2.1 User’s Guide
21
3.1.1 Mobile operation aspects
The small and lightweight CT25K Ceilometer is suitable also for mobile
operation. It has a built-in 12V battery, which enables operation without
external power supply for about an hour in normal room temperature.
NOTE
For switching power to the CT25K fully OFF, turn also
the Battery Switch OFF in addition to the line power
switch. Having the unit ON with battery supply only will
drain the battery.
NOTE
Do not attempt to carry a fully assembled unit alone. Lift
the CT25K from Measurement Unit Base or Pedestal only
(not from the shield). The three main parts - Measurement
Unit, Shield and Pedestal - can be lifted and carried
separately by one person.
3.2 Verification of Proper Operation
Proper operation of the Ceilometer can be checked with help of the
maintenance terminal. Turn the power on. After 30-45 seconds ask for the
status message with the command GET STATUS. Information about
commands can be found in chapter 4 Operation. The message should not
contain any warnings or alarms. In the opposite case see Chapter 7
Troubleshooting.
If a solid, stable cloud base is present at a range of 1,000-5,000 ft., and no fog
or precipitation is present, a quick-check of the detection and the unit
sensitivity can be carried out by observing the variable SUM on the third line
of data message No.2. SUM indicates the sum of detected and normalized
backscatter and its value should be in the range 150...200 if parameter SCALE
has the standard value 100 %. See paragraph 4.4.2 for details.
If suitable clouds are not present for proper operation verification, the unit
may be tilted towards a hard target at known distance. The minimum distance
to the hard target should be at least 300 meters (1,000 ft.). Unexpected
behavior is not totally excluded if e.g. a strong reflector saturates the receiver.
WARNING
When tilting the unit, make sure that nobody is watching it
with binoculars or other magnifying optics.
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