General thermometer users want the probe to respond fast, firm structure, high precision. However, probes with fast response are often weak, and probes with solid structure are sometimes of questionable accuracy, such as failing to meet insertion depth requirements, etc. In addition, the structure of the probe itself can lead to various errors such as low insulation resistance, parasitic potential, corrosion of the solder joint of the casing or lead, and changes in the solder contact resistance and plug contact resistance.
Some production methods have made great progress in eliminating errors caused by the probe itself. Multiple leads may be broken, causing a change in the resistance value, and the user is not easily aware of this change. Single-core leads are either good or bad, and there is no "gray area" of uncertainty. Welding of leads and components with monthly capacitive discharge spot welding. In order to prevent the oxidation of the solder joint, the welding is protected by an emotional gas. Welding parameters, such as welding voltage, welding pressure, electrode type, etc. are specified in detail for each component, especially welding pulse width, since each manufacturer uses different types of leads with different diameters. For some metal interwelding, welding pulse width is very important, but this parameter can not be adjusted in the general spot welding machine.
Under normal conditions, the insulation resistance of a component is very high, but at high temperatures it decreases exponentially. In addition, the use of a peryl binder to bond elements also reduces insulation resistance, because if the glass is not baked properly during manufacturing, it is hygroscopic and absorbs large amounts of water as it cools from high temperature.
