GB/T 4192-1984 specifies the test method for the resistivity of tungsten and molybdenum materials used in electric vacuum devices and electric Light sources. The standard specifies the test principle and designs circuits based on Ohm's law. It puts forward requirements for the accuracy of the test instrument, and standardizes the preparation of the sample, including shape and size. Detailed test steps, such as temperature control, current loading and voltage measurement. Through this standard, the resistivity of tungsten and molybdenum materials can be accurately determined. It provides key data for material selection and performance evaluation in the field of electric vacuum devices and electric Light sources, and helps the mass control and technical optimization of related products. Although it was released earlier, it still has important reference value in specific industries.