Integrated Development and Application of Electrical Safety Testing Equipment – ​​A Case Study of the LISUN LS9955 Fully Automatic Safety Tester

Abstract
Electrical safety is the core indicator in the design, production and certification of electrical products. Traditional discrete test equipment suffers from cumbersome wiring, low efficiency and poor data consistency, which can hardly meet the high-efficiency testing demands of modern production lines and laboratories. Taking the integrated R&D of electrical safety test equipment as the research direction, this paper systematically analyzes LISUN LS9955/LS9956 automatic safety tester, expounds its integrated architecture integrating withstand voltage, insulation resistance, leakage current, grounding resistance and power test, analyzes key technologies including hardware design, software control, safety protection and standard adaptation, and presents core technical parameters and application scenarios. The research shows that integrated electrical safety test equipment can significantly improve detection efficiency and result reliability, providing a stable solution for compliance testing of household appliances, lamps, medical electrical and other products.

1. Introduction
With the popularization of household, lighting and medical electrical equipment, the risk of electrical safety accidents keeps rising. Key indicators such as withstand voltage, insulation, leakage current and grounding are directly related to personal safety and equipment reliability. Traditional detection mostly adopts a combination of single-function instruments, which requires repeated wiring and manual interpretation, easily causing test errors, and failing to satisfy the high-speed testing demands of mass production lines and R&D laboratories. Against this background, the upgrading of electrical safety test equipment toward integration, automation and intelligence has become an industry trend.
As a typical integrated electrical safety test equipment, LISUN LS9955/LS9956 automatic safety tester integrates multiple safety detection functions into one unit, supporting program-controlled testing, automatic judgment, acousto-optic alarm and data storage. It complies with mainstream domestic and international safety standards such as GB 4706.1, GB 7000, IEC 60335, UL 60335 and GB 9706.1, and is widely applied in production line final inspection and R&D verification, providing efficient support for quality control of electrical product safety.

2. System Architecture and Working Principle of Integrated Electrical Safety Test Equipment

2.1 Overall Architecture
The LS9955 series electrical safety test equipment adopts an integrated design of modular hardware and embedded software. Its core components include high-voltage generation unit, resistance measurement unit, leakage current acquisition unit, grounding conduction high-current unit, main control and display module, program control interface and safety protection module, realizing multi-function integration and one-click completion of sequential testing.

Automatic Safety Test System LS9955 AL2

2.2 Core Testing Principle
• AC/DC Withstand Voltage Test
Adjustable high voltage of 0–4000V is applied to the tested circuit to monitor breakdown current, so as to judge the insulation strength and prevent electric shock and breakdown risks.
• Insulation Resistance Test (IR)
DC test voltage is applied to measure the leakage current of insulating materials and convert it into insulation resistance value, evaluating long-term insulation performance.
• Leakage Current Test (LLC)
Simulate the working state to detect the leakage current to the ground or shell, and determine abnormal electric leakage.
• Grounding Resistance Test (GR)
Inject high current of 1–30A to measure the resistance of the protective grounding circuit, ensuring reliable grounding and rapid current discharge in case of faults.
• Power Test (Exclusive for LS9956)
Synchronously measure voltage, current, power and power factor to realize combined detection of safety and performance.

2.3 Automatic Control Logic
The equipment supports editing 50 groups of programs with 8 steps per group. The whole process includes power-on self-check, parameter loading, automatic switching of wiring, step-by-step execution, rapid discharge, PASS/FAIL judgment, acousto-optic alarm and data storage, which reduces manual intervention and improves consistency and efficiency.

3. Core Technical Parameters and Functional Comparison
LS9955 and LS9956 are electrical safety test equipment on the same platform, differing only in the power module. The specific parameters are shown in the table below.

4. Key Technologies and Innovative Advantages

4.1 High Integration
Integrate five major test functions including withstand voltage, IR, LLC, GR and power, replacing multiple discrete instruments, reducing wiring errors, saving space and overall cost, and adapting to high-speed detection of assembly lines.

4.2 Full-process Automation
It features programmable test sequence, automatic grading judgment, acousto-optic alarm, rapid discharge and electric safety barrier detection, improving test speed and operational safety, and suitable for mass production and R&D reuse.

4.3 High-precision Acquisition
Adopt high-precision sampling and signal conditioning technology, with leakage current resolution up to microampere level and grounding resistance accuracy up to milliohm level, meeting high-standard safety regulation requirements.

4.4 Multi-standard Compatibility
It conforms to the latest national standards, IEC and UL standards in household appliances, lighting lamps, medical electrical and other fields. One single device meets certification testing demands for multiple product categories and global markets.

4.5 Remote Control and Data Informatization
Support remote control via upper computer software with traceable parameters and stored test results, facilitating quality traceability and laboratory information management.

5. Application Scenarios and Practical Value

5.1 Typical Application Fields
• Household Appliances: Refrigerators, washing machines, electric irons, etc., in accordance with GB 4706.1 / IEC 60335-1;
• Lighting Lamps: LED lamps, floodlights, etc., in accordance with GB 7000 / IEC 60598;
• Medical Electrical Equipment: Comply with GB 9706.1 to ensure high safety level in medical scenarios;
• Motors, power tools and various low-voltage electrical products for factory inspection and R&D certification.

5.2 Practical Value
• Efficiency Improvement: One device completes multi-item testing, shortening the process by more than 60% and matching production line beat;
• Reliability Improvement: Reduce manual operation errors and significantly enhance test consistency and repeatability;
• Cost Reduction: Cut down equipment investment, site occupation and staffing, lowering operation and maintenance costs;
• Compliance Guarantee: Fully conform to the latest standards, helping products pass certification quickly and reducing market access risks.

6. Conclusion
Integration and automation are the core development directions of electrical safety test equipment. With multi-module integration, program-controlled automation, high-precision measurement and multi-standard compatibility, LISUN LS9955/LS9956 builds an one-stop electrical safety detection solution, effectively solving the pain points of traditional detection. It provides solid support for safety R&D and mass production of household appliances, lighting, medical electrical and other products.

In the future, electrical safety test equipment will further upgrade toward intelligence, digitalization and IoT, realizing automatic code scanning, cloud data uploading, remote diagnosis and AI intelligent judgment. It will continuously improve detection efficiency and quality control level, and escort the safety of electrical products.