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工作原理：
The actual resistance of a buried insulator depends on many factors, such as the environment in which the joint is located. In a very low resistivity environment, the normal resistance measurement for an insulating joint may be as low as 0.5 ohm. 埋地绝缘装置的真实电阻取决于许多因素，诸如绝缘装置所处的环境。在一个非常低的电阻率的环境中，一个绝缘接头的正常电阻测量值可能是低至0.5欧姆。
Checking the insulating joint of a buried pipeline for current leakage is often a more reliable test than an internal resistance test. 通过检测埋地管道绝缘装置的漏电情况要比直接测量内部电阻要更为可靠。 漏电流的绝缘接头比内部电阻的测试通常是一个更可靠的测试。
For this reason, the CE-IT looks at the electrical characteristics of the joint itself rather than the internal resistance. In general, the following conditions are evidenced when an effective insulator is measured: 由于这个原因，CE-IT绝缘装置测试仪更关注绝缘装置本身的电气特性，而不是内部电阻。在一般情况下，当能够满足以下条件时，这个绝缘装置就是有效的：
1、一般而言，绝缘装置两端的接地电压读数是不一样的。
1. Substantially different ground voltage readings are evidenced on opposite sides of the insulator.
The delta Vg is usually smaller or even in the opposite polarity (interference coupling) on the side of the insulator which is opposite from the protected segment of the pipe. 相对于管道的保护段。
1。的相对侧上的被证明基本上不同的接地电压读数。增量Vg为通常比较小，或什至在相反的极性（干扰耦合）
。
2. The percentage of current leakage that the joint will allow to flow through it, is low (25 percent or less). 在绝缘装置处能够允许的电流泄漏率不得超过25%。
3。在绝缘装置上的电压降是显着的。（一个无效的或者短路的绝缘装置上的电压降在不大于10毫伏的范围内，可以忽略不计。）
可以忽略不计在10毫伏或更小的范围内）。
3. The voltage drop across the insulator is significant. (The voltage drop across an ineffective or shorted insulator would be negligible in the range of 10 millivolts or less).
The Model CE-IT Insulator Tester uses the above three criteria to determine if the insulator and testing path (i.e. connections from the test station to both ends of the insulator) is either: open, shorted or good.
To operate: The CE-IT is connected to both sides of the buried insulator through a test station (see below, figure 1).
型号CE-IT绝缘子测试仪使用上述三个判断标准来确定，绝缘装置和测试路径（即从测试桩上的接线柱连接的绝缘装置两端的管道）是否是：开路，短路或良好。
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