Campbell Scientific OBS-3A Turbidity and Temperature Monitoring System - Manual (Page 28)

OBS-3A Turbidity and Temperature Monitoring System
Calibration
The Calibration box can be used to calibrate the OBS-3A for NTU or mg/L
measurements. Press the Calibrate button. You will be asked to select NTU
or mg/L.
After selecting the units, you will be taken to the calibration screen.
For more information on calibration, detailed procedures are found in in
Section 7, Calibration.
6.8.3 Survey Configuration
Select the Survey Configuration mode when operating the unit with a cable
connection to a PC and when high data rates are desired. Data can be logged
with a PC at rates up to 120 lines per minute (2 Hz).
Before setting the survey configuration, run a Barometric Correction from
the Options screen. Be sure to do this while the OBS-3A is at the surface.
Doing so when the instrument is submerged will result in large depth errors.
See Section 6.5, Water-Density and Barometric Corrections, for more details.
All the parameters for a survey configuration are described below. After
setting the parameters, press the Start Survey button to begin logging data.
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