This product is no longer available and has been replaced by: SDM8X50. Some accessories, replacement parts, or services may still be available.
| Services Available | |
|---|---|
| Repair | Yes |
| Calibration | No |
| Free Support | Yes |
Overview
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.
Images
Specifications
| 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) |
Power Requirements |
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| 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) |
Compatibility
The SDMX50 is compatible with a TDR100-based system.
It's used when the multiplexer will be housed in its own enclosure (without the datalogger and power supply).
Documents
Frequently Asked Questions
Number of FAQs related to SDMX50: 6
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The clicking sounds come from mechanical relays making and breaking their contacts.
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No. All SDMX50-series multiplexers in a TDR100 system may be connected to the same 12 V power supply.
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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.
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PC-TDR is a free download in the Downloads section of the PC-TDR web page..
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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).
Case Studies
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