中文简体 中文简体 en English ru Русский es Español pt Português tr Türkçe ar العربية de Deutsch pl Polski it Italiano fr Français ko 한국어 th ไทย vi Tiếng Việt ja 日本語
31 Aug, 2020 1461 Views Author: LISUN

Automatic Electrical Safety System and the notes when you are testing

Equipment introduction:
Automatic Electrical Safety System can test for Withstand Voltage (AC/DC), Insulation Resistance (IR), Leakage Current (LLC), Ground Resistance (GR) and Power.

It is used for luminaries, home application and motor tools safety test in production line or R&D Lab.

The LS9955/LS9956 Automatic Electrical Safety Tester is according to GB4706.1, IEC/EN60335-1, UL60335, GB7000, IEC60598, GB4943, IEC60950 and GB9706.1.

Based on years of experience in the production of LED test equipment, LISUN has developed a fully automatic safety tester. And has been exported to many countries around the world. The specific parameters are as follows:

Withstand Voltage Test (AC/DC)

Insulation Resistance Test (IR)

Voltage Range


Current Range

IR Range


Voltage Range


± (5%+3V)

AC: 0.10~20.00mA
DC: 0.10~12.00mA


5% + 0.5MΩ


Leakage Current Test (LLC)

Grounding Resistance Test (GR)

LLC Range


Voltage Range

GR Range


Output Current


± (0.3%+5uA)



± (5%+2mΩ)


Power Test






Test Time





Class 0.5


Pls. note that the DC high voltage output is a negative voltage, and the ground is a positive. When testing capacitance, there is a charging process when voltage is applied to both ends of the capacitor. At this time, there is a charging current in the test circuit. When the current is greater than the set leakage current value, the withstand voltage tester will alarm to interrupt the test , it cannot be proceed. Therefore, when the safety tester is testing, the voltage should be increased slowly, and the charging current should be less than the set leakage current value until the test voltage is specified, and the test should be performed. It is not possible to use a fixed voltage, reset-start method for testing. In the AC circuit, it is equivalent to the resistance in the DC circuit. Therefore, the safety tester generates a current in the AC circuit when the current is greater than the set leakage current When the value is set, the withstand voltage tester will alarm, making the test interrupted and unable to proceed. Therefore, before the test, you should first calculate the capacitive reactance (Xc) of the capacitor, and then calculate the loop current value under the test voltage, and then adjust the leakage current preset value of the withstand voltage tester to make it slightly larger than the loop current value. And then carry out testing. Test cables and other components (equipment) with large distributed capacitance should be equivalent to capacitor test.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Surge Generator, EMC Test SystemsESD Simulator, EMI Test Receiver, Electrical Safety Tester, Integrating Sphere, Temperature Chamber, Salt Spray Test, Environmental Test ChamberLED Test Instruments, CFL Test Instruments, Spectroradiometer, Waterproof Test Equipment, Plug and Switch Testing, AC and DC Power Supply.

Please feel free to contact us if you need any support.
Tech Dep: [email protected], Cell/WhatsApp: +8615317907381
Sales Dep: [email protected], Cell/WhatsApp: +8618917996096

Tags: ,

Leave a Message

Your email address will not be published. Required fields are marked *