Operating Manual CHM 8k
R1.7 / 01-2020
Technical Data
8
3
Technical Data
3.1 Ordering information
Equipment Versions
Order number
Description
Power supply
Cable length
8349.01-010
CHM 8k EU Basic
230 VAC ±10%
10 m
8349.11-010
CHM 8k EU + DSL Modem
230 VAC ±10%
10 m
8349.11-003
CHM 8k EU + DSL Modem
230 VAC ±10%
3 m
8349.21-010
CHM 8k EU + Battery Backup
230 VAC ±10%
10 m
8349.31-010
CHM 8k EU + DSL Modem + Battery Backup
230 VAC ±10%
10 m
8349.02-010
CHM 8k US Basic
115 VAC ±10%
10 m
8349.12-010
CHM 8k US + DSL Modem
115 VAC ±10%
10 m
8349.22-010
CHM 8k US + Battery Backup
115 VAC ±10%
10 m
8349.32-010
CHM 8k US + DSL Modem + Battery Backup
115 VAC ±10%
10 m
Table 1 Equipment versions.
Composition of order numbers
:
8349.xx-yyy
8349
=
CHM 8k basic unit (instrument, documentation, transport box)
x
x
= Special interface, other features (modem, battery backup, etc.)
x
x
= Country code (EU or US)
yyy
= Cable length (003 = 3m; 010 = 10 m; 050 = 50m)
3.2 Technical data
Measurement parameters
Measuring range
0
m … 10 km (0 … 32808 ft)
Cloud detection range
5 m … 8 km (16 … 26246 ft)
Resolution (measured)
5 m
NetCDF data resolution
(*)
5 m
– 30 m in 5 m steps (can be set by the user)
15 m (default setting)
NetCDF high resolution data
5 m (defined for limited HR vector of data)
Logging time and reporting
cycle
(*)
2 s to 600 s (programmable)
Default value: 15 s
Measurement objects
Aerosols, clouds (droplets, ice crystals)
Measured / set parameters
Backscatter raw data
Cloud heights up to 9 layers including penetration depth, max.
detectable range (MXD), vertical visibility (VOR), Sky Condition
Index (SCI), cloud cover (TCC, BCC), ...
Measuring principle
Lidar (optical, time of flight)
Optical parameters
Light source
Laser diode
Wavelength
905 nm
Pulse energy
2 μJ max. (1.6 μJ typical)
Pulse repetition rate
8 kHz
Filter bandwidth
25 nm
Field-of-view receiver (FOV)
1.1 mrad
Extended NOHD
400 m (for 50 mm aperture)