GB/T 5977 - 1999 Specifies platinum wire for resistance thermometers. It specifies the technical requirements of platinum wire, including purity, resistance value and its accuracy at different temperatures. Appearance mass of platinum wire, such as surface Smoothness, presence of defects, etc. The standard gives detailed test methods for testing the performance of platinum wire. At the same time, it specifies inspection rules, from sampling methods to judgment criteria. This standard provides a mass control basis for the production of platinum wires for resistance thermometers, and helps to produce high-precision and Stability platinum wires to ensure that resistance thermometers accurately Measuring temperature, widely used in industrial, scientific research and other temperature measurement fields.