线缆长度可达 25 m
概览
CS645探头用于TDR100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7.5 cm，可以让CS645用于超高电导率的土壤（最大土壤容积电导率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TDR100 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CS640探头；两者仅在线缆方面有差别。
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技术说明
CS645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 | 5 dS/m |
| Rod Diameter | 0.16 cm (0.063 in.) |
| Rod Length | 7.5 cm (2.95 in.) |
| Santoprene Head Dimensions | 4.5 x 2.2 x 1.0 cm (1.8 x 0.9 x 0.4 in.) |
常见问题解答
CS645-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).