这个产品是无效的且被替换: SDM8X50.
| Services Available | |
|---|---|
| Repair | Yes |
| Calibration | Yes |
| Free Support | Yes |
概览
SDMX50SP 是3种 50-欧姆的同轴的 8:1 扩展板中的一种，用于TDR100测量系统。这种扩展板设计用于安装在用户提供的防护机箱中。它含有具有电涌防护功能的扩展板电路板，封装在金属壳内；以及一个独立的应力释放支架。扩展电路板组件和应力释放支架都钻有 1”标准间距的孔，这使得SDMX50SP 可以被固定到立面上，或由用户提供的机箱的背板上，或Campbell Scientific 提供的防护机箱中（例如：ENCTDR100, ENC12/14, ENC16/18）。
图像
产品规格
| Multiplexer Housing Dimensions | 24.9 x 12.2 x 4.6 cm (9.8 x 4.8 x 1.8 in.) with mounts |
| Strain Relief Bracket Dimensions | 20.3 x 4.3 x 1.3 cm (8.0 x 1.7 x 0.5 in.) |
| Weight | 590 g (1.3 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.) |
常见问题解答
SDMX50SP: 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).