线缆长度可达 25 m
概览
CS635探头用于TDR100和TDR200为核心的系统，它含有Sanoprene头部、3根不锈钢探针和低信号损耗的LMR200DB线缆。每根探针的长度为15 cm，可以让CS635用于高电导率土壤（最大土壤容积电导率3.5 dS/m）。LMR200DB低信号损失线缆的最大长度可达 25 m，指从探头顶端到 时域反射仪主机的距离。对于需要更短线缆（最长15 m）的应用，建议使用CS630探头；两者仅在线缆方面有差别。
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技术说明
CS635充当导波器，沿着探针的阻抗随周围土壤的介电常数变化而变化。因为介电常数的大小主要与含水量大小相关，所以由反射测量结果可以解析出土壤体积含水量。土壤容积电导率可由发射脉冲的衰减程度测定得到。
产品规格
| Maximum Soil Bulk Electrical Conductivity | 3.5 dS/m |
| Rod Diameter | 0.32 cm (0.125 in.) |
| Rod Length | 15 cm (5.9 in.) |
| Santoprene Head Dimensions | 5.75 x 4.0 x 1.25 cm (2.25 x 1.57 x 0.49 in.) |
常见问题解答
CS635-L: 1
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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).