SDMX50 50 Ohm Coaxial Multiplexer with Enclosure

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This product is not available for new orders. We recommend ordering: SDM8X50.

SDMX50 50 Ohm Coaxial Multiplexer with Enclosure

Services Available
Repair	Yes
Calibration	No
Free Support	Yes

Resumen

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.

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Preguntas frecuentes

Número de FAQs relacionadas con SDMX50: 7

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How far can an SDMX50-series or SDM8X50 multiplexer be separated from a TDR100 or TDR200?

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).
Are SDMX50-series and SDM8X50 multiplexers only usable with the TDR100 or TDR200 system?

Yes.
Why might an SDMX50-series multiplexer make clicking sounds?

The clicking sounds come from mechanical relays making and breaking their contacts.
Does an SDMX50-series multiplexer require a separate power supply?

No. All SDMX50-series multiplexers in a TDR100 system may be connected to the same 12 V power supply.
What is the difference between the SDMX50, SDMX50SP, and SDMX50LP coaxial multiplexers?

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.
Where is PC-TDR available for download?

PC-TDR is a free download in the Downloads section of the PC-TDR web page..
Can the TDR100 PC-TDR support software be used to control the SDMX50-series multiplexers?

Yes. PC-TDR can send control commands to advance through the channels of a SDMX50-series multiplexer. To do this, select Settings | Multiplexer and then add the multiplexers and probes that match the TDR100 system.

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Especificaciones

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
Peso	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)