The SDMX50 is available in a very limited supply. The SDMX50 will be replaced by the SDM8X50.
The SDMX50 is one of three 50 ohm, coaxial, 8:1 multiplexers that can be used in a TDR100-based system. It consists of a surge-protected multiplexer circuit board mounted in a 10" x 12" x 5" environmental enclosure. The enclosure's backplate provides a strain-relief point for the coaxial cables. Cable ties and desiccant are included.
|Outside Dimensions||40.4 x 29.2 x 17.5 cm (15.9 x 11.5 x 6.9 in.) with mounts|
|Inside Dimensions||25.4 x 30.4 x 12.7 cm (10 x 12 x 5 in.) for enclosure|
|Weight||4.4 kg (9.8 lb)|
|Input Power||12 Vdc|
|Quiescent Current Drain||< 1 mA|
|Current Drain during Switching||~ 90 mA (all multiplexers of the same level switch simultaneously for less than 1 s)|
Number of FAQs related to SDMX50: 6
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These three multiplexers all use the same relay board, but the housing differs. The multiplexers are described side-by-side on page 2 of this brochure.
The most popular model is the SDMX50SP, followed by the SDMX50.
PC-TDR is a free download in the Downloads section of the PC-TDR web page..
In applications where TDR probes are used to measure soil water content, the maximum distance from the TDR probe back to the TDR100/TDR200 (even through one or more multiplexers) cannot exceed 15 m (50 ft) when using RG58 coaxial cable; the CS605-L, CS630-L, and CS640-L TDR probes have an RG58 cable. When using low-loss coaxial cable, the distance cannot exceed ≈25 m (80 ft); the CS610-L, CS635-L, and CS645-L TDR probes have a low-loss coaxial cable.
In slope stability and rock mass deformation applications, the maximum coaxial cable length should not exceed ≈1 mile (5,280 ft). The maximum combined length of all SDM cables in the system should not exceed ≈76 m (250 ft).
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