This standard applies to variable capacitors used in electronic equipment and specifies applicable terminology and test methods. The capacitors described in this standard are classified according to the type (function), medium, type, and purpose defined in 3.8, 3.9, and 3.10. Each "type specification" will specify specific tests and requirements applicable to various levels of capacitors. The detailed specifications for capacitors of a certain specification should be formulated according to the relevant "type specifications". The purpose of the capacitor test described in this standard is to establish as much as possible under laboratory conditions: a. The applicability of capacitors within the specified temperature, atmospheric pressure, and humidity range; B. The ability of capacitors to withstand specified mechanical shock conditions, which may be encountered during transportation or work. The ability of capacitors to withstand harsh conditions during normal assembly (such as welding) during equipment assembly, without compromising the aforementioned α Items and b. Some of the tests in this standard are accelerated tests, or tests conducted under simulated conditions or even under the most severe conditions of use. These tests determine appropriate quality standards and cannot be used to provide reliable data on any performance beyond the test cycle and test conditions. If there is a substantial difference between the required working conditions and the test conditions specified in this standard, then refer to the manufacturer's information on the adaptability of the components for a specific purpose. Generally speaking, as long as the stress imposed by the environment or load on the component is not too severe, it is expected to achieve a longer service life within a given performance range. Unless otherwise specified in the relevant specifications, the tests specified in this standard are applicable to each pair of multiple capacitors. In this standard, the term terminology is defined as follows: 8.1 Variable capacitor A capacitor designed to continuously change capacitance throughout its entire capacity range. 8.2 Differential capacitor: A capacitor that is composed of two sets of fixed pieces that are insulated from each other and a set of moving pieces that work together. The moving pieces of this type of capacitor have been appropriately designed and arranged. When the capacitance between the moving pieces and one set of fixed pieces increases, the capacitance between the moving pieces and another set of fixed pieces decreases, but the sum of these two capacitors remains basically unchanged at all adjustment positions. 8. Split stator capacitor is a type of capacitor that consists of two sets of insulated fixed capacitors working in series with a common set of moving capacitors