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自然伽玛测井仪在调试过程中的关键问题是光电倍增管工作点的确定,也是困绕测井仪的主要问题。本文给出了自然伽玛测井仪工作点确定方法以及自然伽玛测井仪的测井原理,设计出了自然伽玛测井仪的线路图,分析了影响光电倍增管工作点的主要因素,并以YXZ138型自然伽玛测井仪为例进行了说明。
The key issue in the commissioning of Gamma-ray logging tool is the determination of the operating point of the photomultiplier tube, which is also a major issue for the trapped logging tool. This paper gives a method to determine the working point of Gamma tool and the logging principle of Gamma tool. The circuit diagram of Gamma tool is designed. The main factors affecting the working point of PMT are analyzed , And YXZ138 type of natural gamma logging tool as an example.