LISST-
Tau User’s Manual
Appendix A: Technical Specifications
Page 21
Appendix A: Technical Specifications
General / Electrical
Parameters measured/derived
Optical transmission
Beam attenuation
Data interface
RS-232 serial, 19200 baud, 8 bits, no parity, 1 stop
Analog output
0
– 5 V, proportional to transmission (4.5V = 100%)
Sample rate
1 output per second
Input voltage
7 to 25 V
Current draw @12 V
Green: 42 mA
Red: 20 mA
Mechanical / Environmental
Operational temperature range
-3 to 40 °C
Storage temperature range
-20 to 60 °C
Dimensions
(See figure on following page)
5.1 cm [2.00 in] diameter; 40.6 cm [16 in]
overall length
Weight in air
1.14 kg [2.5 lb]
Weight in water
0.59 kg [1.3 lb]
Depth maximum
2000 meters
Optical / Measurement
Optical path length
15 cm
Measurement range
~0 to 30 m
-1
(>99% linearity in concentration)
Source wavelength
532 or 650 nm nominal
Source spectral bandwidth
10 (FWHM)
Acceptance angle
1.0° (half angle, in water)
Short-term stability
(Standard deviation over 1
minute, typical)
Transmission: 0.003 % (Green) / 0.005% (Red)
Attenuation: 0.0002 m
-1
(Green) / 0.0004 m
-1
(Red)
Long-term stability
(6 Hour Test)
~0.003 %FS/hour transmission; ~0.0002 m
-1
/hr beam
attenuation
