RETIRED ›
This product is no longer available and has been replaced by: SDM8X50.
SDMX50 50 Ohm Coaxial Multiplexer with Enclosure
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

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)


Frequently Asked Questions

Number of FAQs related to SDMX50: 6

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  1. The clicking sounds come from mechanical relays making and breaking their contacts.
  2. No. All SDMX50-series multiplexers in a TDR100 system may be connected to the same 12 V power supply.
  3. 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.

  4. PC-TDR is a free download in the Downloads section of the PC-TDR web page.

  5. 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

California: Coastal Slope Monitoring
The North County Transit District (NCTD) of San Diego County, California, determined that three segments......read more
Australia: Rhizolysimeter Facility
The Charles Sturt University (CSU) Rhizolysimeter is one of the largest root-growth research facilities in......read more
Ohio: Monitoring Sinking Highway
When the Ohio Department of Transportation (Ohio DOT) was preparing to widen Interstate 77, they......read more
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