The dielectric strength tester is extremely versatile and is applied in almost all fields related to power and electronic products.
Electronic components and materials
Capacitors, transformers, inductors: Test their insulation strength between layers, between windings, and with respect to the ground.
PCB (Printed Circuit Board): Tests the insulation performance between test lines and between layers to prevent leakage or breakdown under high voltage.
Insulating materials: such as plastics, films, ceramics, insulating varnish, tapes, etc., are used to assess the dielectric strength of the materials themselves. This is a key parameter for material selection and development.
Switches, connectors, relays: Test the insulation capabilities between contacts and between contacts and the housing.
2. Household and Commercial Appliances
This is one of the most common application areas. All devices with power cords need to undergo voltage resistance tests to ensure the safety of users.
Examples: Refrigerators, washing machines, air conditioners, microwave ovens, hair dryers, computers, mobile phone chargers, etc. The tests are usually conducted between the power cord (L and N terminals) and the accessible metal casing (ground terminal).
3. Electrical wires, cables and motors
Wire and cable: Testing the insulation strength between the conductor and the outer sheath is a mandatory test item for the factory inspection of cables.
Motors and generators: Testing the insulation strength between the windings and the iron core (ground), as well as between different phases of the windings, is crucial for newly manufactured, repaired, or long-operated motors.
4. Electrical Equipment and New Energy
High-voltage switch cabinets, transformers, and transformers: Ensure that they can withstand system overvoltages (such as lightning strikes, operational overvoltages) in the power grid.
Photovoltaic inverters, wind power converters, and electric vehicle charging stations: These devices involve high voltages and large currents. Their insulation safety is the lifeline, and withstand voltage testing is a mandatory inspection step.
Components related to electric vehicles: such as battery packs, drive motors, and electronic control systems, all need to undergo strict dielectric strength tests.
5. Medical Devices
Medical equipment comes into direct contact with patients and has extremely high requirements for electrical safety.
Monitoring equipment, ultrasound devices, X-ray machines, surgical equipment, etc. Relevant standards (such as IEC 60601-1) have very strict and specific regulations for pressure resistance tests.
6. Information Technology and Office Equipment
Servers, workstations, printers, monitors, etc., must be ensured to be safe for users in case of power failure.
Standards and Procedures
To conduct dielectric strength tests, strict adherence to relevant standards is mandatory. These standards specify key parameters such as test voltage, duration, ramp-up rate, and qualification criteria. The standard system is mainly divided into international standards, national standards, and industry standards.
Core international standard
IEC 61010-1: Safety Requirements for Measuring, Controlling and Laboratory Electrical Equipment – Covers the safety of both the laboratory and the testing equipment itself.
IEC 60335-1: Safety of Household and Similar Electrical Appliances – This is the most fundamental and crucial safety standard in the home appliance industry.
IEC 60598-1: General Safety Requirements for Luminaires.
IEC 60601-1: Safety Requirements for Medical Electrical Equipment.
IEC 60950-1 / IEC 62368-1: The former is about the safety of information technology equipment, while the latter is about the safety of audio-video, information and communication technology equipment. These are new alternative standards.
IEC 60204-1: Safety of Electrical and Electronic Equipment.
IEC 60060-1: High Voltage Testing Technology – Defines the general definitions and procedural requirements for high voltage tests.
Chinese national standards (GB standards, which are usually equivalent or modified to adopt IEC standards)
GB 4706.1: Safety of Household and Similar Electrical Appliances – Part 1: General Requirements (Equivalent to IEC 60335-1).
GB 9706.1: Medical Electrical Equipment – Part 1: General Requirements for Basic Safety and Basic Performance (Equivalent to IEC 60601-1).
GB 4943.1: Information technology equipment – Safety – Part 1: General requirements (equivalent to IEC 60950-1).
GB/T 1408.1: Test Methods for Electrical Strength of Insulating Materials – Part 1: Test at Power Frequency – This is a basic standard specifically for testing the dielectric strength of insulating materials.
GB/T 16927.1: High Voltage Test Technology – Part 1: General Definitions and Test Requirements (Equivalent to IEC 60060-1).
Post time: Jun-29-2026