Campbell Scientific TDR100 TDR100 Time Domain Reflectometry Systems - Page 38
Algorithm Parameter Adjustment for Special Conditions
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TDR100 9.2.2 Algorithm Parameter Adjustment for Special Conditions The standard settings for the apparent length algorithm work well for nearly all applications. For special cases of very long cables or some probes that are not manufactured by Campbell Scientific an algorithm parameter change can improve results. The parameter discussed here affects how the algorithm finds the beginning of the TDR probe. 9.2.2.1 Terminal Emulator Commands for Apparent Length Algorithm There are two commands associated with the apparent length algorithm. GMOP will get and display current parameter setting. SMO1 x.xx sets the apparent length parameter to decimal value x.xx. The default value is 0.25 and the range is 0.05 to 1.0. > See operating manual for command descriptions Press Enter for > prompt Electrical conductivity parameters SEC1 xx Set EC Parameter 1 SEC2 xx.xx Set EC Parameter 2 SEC3 xx.xx Set EC Parameter 3 SEC4 xx.xx Set EC Parameter 4 GECP Get EC Parameters Apparent length parameters SMO1 0.xx Set Apparent Length Threshold GMOP Get Apparent Length Parameters SSU Save Changes to EEPROM FIGURE 9-2. PCTDR terminal emulator screen showing TDR100 algorithm parameter variables. The SMO1 parameter alters the part of the algorithm that finds the beginning of the probe. In cases where the amplitude of the waveform at point 2 as shown in Figure 9-1 is low, reducing the SM01 value makes the algorithm more sensitive. Reduced amplitude at point 2 can result from signal losses in long probe cables. Increasing the SM01 value can help when noise is present. When adjusting SM01, do so in small increments, e.g. 0.05. When the correct value is found, enter command SSU to write the value to memory. 32