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h1 (5 characters) = 1st Height
If detection status is 1, 2, or 3 h1 = Lowest cloud base reported
If detection status is 4 h1 = Vertical visibility as calculated
If detection status is 0 or 5 h1 = /////
h2 (5 characters) = 2nd Height
If detection status is 2 or 3 h2 = Second cloud base reported
If detection status is 4 h2 = Height of highest signal detected
If detection status is 0, 1, or 5 h2 = /////
h3 (5 characters) = 3rd Height
If detection status is 3 h3 = Third cloud base reported
If detection status is 0, 1, 2, 4, or 5 h3 = /////
flags (8 characters) = Alarm or warning information 4-byte hex coded
Table 6-7: Most significant alarm word for CT25K messages
Bit
1
Description
8000 XXXX
Transmitter shut-off
4000 XXXX
Transmitter failure
2000 XXXX
Receiver failure
1000 XXXX
DSP, voltage or memory failure
0800 XXXX
Reserved for future use
0400 XXXX
Reserved for future use
0200 XXXX
Reserved for future use
0100 XXXX
Reserved for future use
0080 XXXX
Window contaminated
0040 XXXX
Battery low (not applicable to the SkyVUE 8M)
0020 XXXX
Transmitter expire warning
0010 XXXX
Heater or humidity sensor failure
0008 XXXX
High radiance warning, also XXXX 0004
0004 XXXX
DSP, receiver, or laser monitor failure warning
0002 XXXX
Relative humidity > 85 %
0001 XXXX
Light path obstruction, receiver saturation or receiver failure
1
Alarm words are sum of error bits.
SkyVUE™8M Tactical LIDAR Ceilometer
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