Campbell Scientific offers three multiplexer models for TDR system, the SDMX50 series. Combining multiplexers allows measurement of up to 512 TDR probes. The SDMX50 series are 50 ohm, coaxial, 8:1 multiplexers with surge protection; 12 Vdc power is required. The multiplexers use Campbell Scientific’s SDM communications protocol and can be controlled via a datalogger or a computer running PCTDR.
The models differ only in their packaging. The SDMX50 provides the most components; it includes the multiplexer, enclosure, enclosure backplate, and enclosure supply kit.
