Digitizing Methods And Errors in Conductivity-Temperature-Depth Systems

Digitizing is a critical process because loss of resolution or inaccuracy introduced at this point cannot be rectified. It is suggested that conductivity-temperature-depth (CTD) systems ideally should measure these parameters to a precision of at least 150 ppm. Digitizing methods employed in CTD systems are discussed and evaluated. A worst-case error analysis of several CTD systems is presented. It is shown that two of the digitizing methods are less suitable than the others when errors and other factors are taken into consideration.