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The linear transformer winding of medical electrical equipment needs to have sufficient insulation to prevent dangerous situations that may arise from overheating in internal short circuits. The transformer voltage and frequency doubling test, which evaluates quality and electrical safety characteristics, is one of the most important tests for safety of medical electrical products.

The transformer of medical electrical equipment shall protect against overheating caused by any output winding short-circuit or overload. When the transformer is overloaded or short-circuited, medical equipment still need to maintain product safety, preventing overheating and insulation failure. 

Refers to the medical electrical equipment that claim to be anti-defibrillation. When patients are defibrillated, any accessible part of the equipment, patients' cables, and cable connectors, etc., which are not protected or grounded, will not release dangerous levels of charge or energy from the flashover of the defibrillation voltage. Furthermore, the medical equipment should also continue to function normally after being exposed to such voltage.

Refers to the medical equipment's only risk reducing measure failing or exhibiting one form of abnormality. Under the state of this single fault, the medical electrical equipment still needs to maintain product safety.

Mould stress relief is to ensure the thermoplastic shells of medical electrical products, formed through mold pressing or injection molding, are well constructed. Any shrinkage or deformation stemming from internal stress during the process of mold pressing or injection molding cannot lead to any unacceptable risks. The Mould stress relief  test, which evaluates the safety characteristics of the products' outer shell, is one of the most important tests for safety of medical electrical products.

Ball pressure is to ensure the mechanical strength and heat resistance of a product's insulation material meet requirements, as to guarantee its insulation characteristics is not reduced. The ball pressure test, which is used to evaluate how safe the insulating materials are, is one of the most important tests for safety of medical electrical products.