Campbell Scientific TDR100 TDR100 Time Domain Reflectometry Systems - Page 17
System Components, Datalogger Control
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TDR100 ( ) Lw = L ⋅ θv−max + 0.176 0.114 +2 with L the actual probe rod length, and, θv-max the maximum expected volumetric water content. Two m is added for the .5 m before the probe and some distance after the probe end. For example, using a CS610 with 0.3 m probe rod length in a soil with a porosity of 0.6 gives an estimated apparent probe length of 4.04 m. Setting the Waveform Length to 4 m is recommended. 5. System Components: Datalogger Control 5.1 General Datalogger FIGURE 5-1. TDR System Components 5.2 Datalogger Campbell Scientific CR800, CR850, CR1000, and CR3000 dataloggers use Instruction "TDR100" to control the TDR100 measurement sequence and store the resulting data. PC400 or LoggerNet (version 3.0 or higher) are used to create and send the CRBasic Program to the datalogger. Campbell Scientific CR10X and CR23X dataloggers use Instruction 119 and various other instructions to control the TDR100 measurement sequence and store the resulting data. PC208W (version 3.1 or higher) or LoggerNet are used to link the datalogger to a computer for data and program transfer. 11