Friday, March 13, 2020

LISUN 3M Integrating Sphere Test Results Comparison

Lisun engineers visited Barcelona recently, this visit was mainly to install the 3m Integrating Sphere Test System for the customer and provide training service.

This customer compared the test results of Lisun’s 3m Integrating Sphere Test System with the test results of Holophane(HEL) and LIA Laboratories. This customer provided 4 samples to the third lab. Compared with LIA Laboratories, our tolerance are controlled within 5%:

HAL – LED Highbay: 4.6%

VMX LED Luminarie: 2.3%

Corn Lamp: 2.5%

Platek – Target Medium Prioette LED Luminaries: 0.5%

LISUN 3M Integrating Sphere Test Results Comparison
The test report of Platek tested by Lisun 3m Integrating Sphere Test System

LISUN 3M Integrating Sphere Test Results Comparison
The test report of Platek tested by LIA Laboratories-1

LISUN 3M Integrating Sphere Test Results Comparison
The test report of Platek tested by LIA Laboratories-2

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, Spectroradiometer, Integrating Sphere, LED Test Instruments, CFL Test Instruments, Photometer and Colorimeter, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test , Dustproof Test Chamber, High and Low temperature Humidity Chamber, Plug and Switch Testing, AC and DC Power Supply.


Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618917996096

Thursday, March 12, 2020

IEC 60529(GB4208-2008)IP Protection Grade Waterproof and Dustproof test

IEC 60529 IP code is a coding system to indicate the degrees of protection provided by an enclosure against access to hazardous parts, ingress of solid foreign objects, ingress of water and to give additional information in connection with such protection IP code includes 4 digits, like IP23CH. IP short for ingress protection; numeral 2 stands for first characteristics and can be instead by numerals 0 to 6 or letter X (not requires to specified), it indicates enclosure against ingress of solid foreign; Numeral 3 standards for second characteristics and can be instead by numerals 0 to 8 or letter X (not requires to specified), it indicates enclosure against ingress of water with harmful effects. Letter C is additional letter, indicates enclosures access to hazardous parts, can be instead by letters A, B, C and D, but this characteristic can be ignored; Letter H is supplementary letter, can be instead by letters H, M, S and W, but this characteristic can be ignored. In this article, we just discuss the first and second characteristics.

IP Code dustproof test

The first characteristic can mark with numerals 0 to 6. We temporally ignore the second characteristic, additional letter and supplementary letter, i.e. IP0X to IP6X. According to IEC60529, it describes as: IP0X——non protected; IP1X——≥50mm diameter; IP2X——≥12.5mm diameter; IP3X——≥2.5mm diameter; IP4X——>1.0mm diameter; IP5X——dust protected; IP6X——dust tight.

There are many standards refer to IEC60529 regarding dustproof test, like IEC60598 luminaires general requirements and tests, clause 2.3 mentioned to classified the luminaire according to degree of protection against ingress of dust, solid objects and moisture; GB2423.37-89 electric and electronic products basic environmental testing procedure mentioned that sand and dust test method; GB/T4942.2-93 protection grade for low voltage device shell; GB7000.1 and GB7001 luminaire general requirements and test standard mentioned that the luminaire only need to do the test for IP5X and IP6X.

LISUN SC series dustproof testing machine is for IP5X and IP6X test.

SC 015_Dustproof Testing Machine

IP Code waterproof test

The second characteristic can mark with numeral 0 to 8. We temporally ignore the first characteristic, additional letter and supplementary letter, i.e. IPX1 to IPX8. According to IEC60529, it describes as: IPX0 non protected; IPX1——vertically dripping; IPX2——dripping (15°tilted); IPX3——spraying; IPX4——splashing; IPX5——jetting; IPX6——powerful jetting; IPX7——temporary immersion; IPX8——continuous immersion. The applied water requests clean water. According to the standard, drip box is for IPX1 and IPX2 test; Oscillating tube or spray nozzle is for IPX3 and IPX4 test, the semi-diameter of oscillating tube has 8 solutions for optional according to the size of the sample, the minimum is 200mm, the maximum is 1600mm, and increase step is 200mm. But quantity of the holes is difference for each grade. For example, there are 8 holes in semi-diameter 200mm tube for IPX3, but for IPX4, there are 12 holes in semi-diameter 200mm tube. Water jet hose nozzle is for IPX5 and IPX6 test, but difference grade, the inner diameter of nozzle is different, the inner diameter of nozzle is 6.3mm for IPX5, and 12.5mm is for IPX6, the distance from nozzle to enclosure is 2.5m to 3m. Immersion tank is for IPX7 and IPX8 test, the test time is 30min for IPX7.

LISUN JL-X series is for IPX1 to IPX8 test.

JL 12 FT1_JL X AM_Waterproof Test

There are also many standards refer to IEC60529 regarding dustproof test, like IEC60598 luminaires general requirements and tests mentioned to classify the luminaire according to the degree of protection against ingress of water; IEC60335 house holding and similar electrical appliance general requirements and  IEC60034-5:2000 degrees of protection provided by the integral design of rotating electrical machines mentioned the waterproof test.

In practice, it is a big problem for electronic equipments, luminaire, and house holding manufactures to find the right products to do the waterproof and dustproof test. Lisun Group developed the SC-X series dustproof test chamber and JL-X series waterproof test equipment according to IEC60529. SC-X dustproof test chamber is for IP5X and IP6X test, there are several models for optional according to the sample size.

JL-X is for IPX1 to IPX8 test, there are four equipments for optional, JL-12 drip box is for IPX1 and IPX2 test; JL-34 swing pipe water spray test equipment is or IPX3 and IPX4 test; JL-56 waterproof jet test device is for IPX5 and IPX6 test; JL-78 immersion tank is for IPX7 and IPX8 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, Spectroradiometer Integrating Sphere System, LED Test Instruments, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test ChamberWaterproof Test ,Dustproof Test , High and Low temperature Humidity Chamber, Plug and Switch Testing,etc.


Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618917996096

Analysis on the Status of Certified LED Bulb in USA Energy Star

Energy Star certification (Energy Star certification) is a certification which can adapt to the requirements of the United States Energy Department. In addition to UL, FCC certification, it is the most popular certification of lighting products to enter the United States market. UL reflects the goods safety performance, FCC reflects the electromagnetic compatibility of products, while the Star Energy certification reflects the goods energy saving performance of the products. Especially for the current global energy shortage, the United States energy Department has promulgated a series of energy saving plan, and the promotion of energy saving products is the main activity.

Analysis on the Status of Certified LED Bulb in USA Energy Star

Dated on October 2015, the United States on the market with a total 2995 bulb lamp products obtain the United States Energy Star certification, mainly used to replace the 25W, 40W, 60W and 100 watt ordinary lighting with incandescent, which won the 1563 kinds of LED bulb , LED ball was certificated in more than 190 companies.

The product size of the LED bulb is generally A19, A21 and A15 (A). The shape of the bubble is spherical, and the size of the bubble is 19*1/8. LED bulb lamp for E26, E26d, E12 and GU24.

The LED ball is licensed for 2 years, the time is short for years, most of the product warranty time is 3-5 years, and more than 10 years, and even individual enterprise warranty period is 15 years.

The amount of Chinese Certified companies have continued to increase, in more than 190 certified enterprises, Chinese enterprises occupied half, some domestic enterprises designed a variety of products won the energy star certification.

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, Spectroradiometer, Integrating Sphere, LED Test Instruments, CFL Test Instruments, Photometer and Colorimeter, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test , Dustproof Test Chamber, High and Low temperature Humidity Chamber, Plug and Switch Testing, AC and DC Power Supply.


Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618917996096

Wednesday, March 11, 2020

The Status of Waterproof Test Equipment in China Market

Waterproof grade reflects the ability of moisture-proof of products. Especially for outdoor activities, it is unavoidable to be in the harsh environment of high humidity. The sealing and water-proof ability of the instrument is very important to ensure the safe of operation and life of the instrument.    

At present, there are many manufacturers producing waterproofing equipment on the market. What are the advantages of LISUN waterproof equipment compared with other manufacturers? There are some advantages for LISUN waterproof in below:

1. On the side of excellent cost performance, In test equipment market, the quality of LISUN waterproof equipment is good than the waterproof equipment of most of suppliers. Please kindly see Figure 1 and Figure 2. Besides, the price of LISUN waterproof test equipment is very competitive in market. Right price with good quality is cost-effective products for our customer to make a good choice for test equipment. Compare to Figure 2, visibly, the surface of material of LISUN waterproof equipment in Figure 1 (LISUN Model:JL-34) has high gloss. And the surface of material in Figure 2 (Other supplier’s Model) have poor gloss. Good material with high gloss makes the equipment more beautiful visually. Regarding to choosing material, LISUN use SUS304 stainless steel as raw material. One more, the regulator in Figure 1 (LISUN Model JL-34) is much better than the regulator in Figure 2.

The Status of Waterproof Test Equipment in China Market
Figure 1: Surface of IPX3-IPX4 (LISUN Model:JL-34)


Figure 2: Surface of IPX3-IPX4 (Other supplier's model)

2. Speaking of structure of IPX3-IPX4, please kindly see Figure 3 and Figure 4 in below. The waterproof test equipment in Figure 4 (Other supplier’s Model) is Wall-Hanging Split Type, but the waterproof test equipment in Figure 3 (LISUN Mode: JL-34) is Two Cabinets Type. Compare to Wall-Hanging Split Type, two cabinets type is easy to carry. Besides, the cabinets of LISUN model JL-34can be mounted wheels at the bottom, which is more easier for operator to carry and adjust placement.

Figure 3: Two Cabinets Type IPX3-IPX4 test equipment (LISUN Model:JL-34)
Figure 3: Two Cabinets Type IPX3-IPX4 test equipment (LISUN Model:JL-34)


Figure 4: Wall-Hanging Split Type IPX3-IPX4 test equipment (Other supplier’s Model)

3. With the view of production details for waterproof test equipment, we can see many welded junctions in Figure 6 and Figure 7(Other supplier’s Model), which not only affects appearance, but also makes it easier for water to erode equipment. please kindly see Figure 5 & Figure 6 & Figure 7 in below. In Figure 5(LISUN Model: JL-34), we can see that the surface of the equipment is clean and glossy, and there is no welded junction.

The Status of Waterproof Test Equipment in China Market
Figure 5: Production details (LISUN Model:JL-34)


Figure 6: Production details (Other supplier’s Model)


Figure 7: Production details (Other supplier’s Model)

4. Speaking of turntable, we can easily judge the good or bad quality of turntable by through below Figure 8 and Figure 9. After waterproof test equipment is used for a long time, in below Figure 9 (Other supplier’s Model), we can find many rust spots on the machine. In below Figure 8(LISUN Model:JL-34), there is no rust spot on that machine. Thus it can be seen good material can make machine have good corrosion resistance and durability. The turntable of LISUN model JL-34 also mounted wheels at the bottom. This is also more convenient for the operator to move the turntable.

Figure 8: Turntable of IPX3-IPX4 (LISUN Model:JL-34)
Figure 8: Turntable of IPX3-IPX4 (LISUN Model:JL-34)


Figure 9: Turntable of IPX3-IPX4 (Other supplier’s Model)

5. For swing pipe and spray nozzle for IPX3 and IPX4, compare to Figure 11, the quality of swing pipe and spray nozzle in Figure 10 is better and more elaborate .which also make operator control water flow accurately, and Good parts can make the equipment be used for long term.

Figure 10: IPX3-IPX4 Swing pipe and spray nozzle (LISUN Model:JL-34)
Figure 10: IPX3-IPX4 Swing pipe and spray nozzle (LISUN Model:JL-34)


Figure 11: IPX3-IPX4 Swing pipe and spray nozzle (Other supplier’s Model)

6. Regarding to wire of waterproof, please kindly see Figure 12 and Figure 13 in below. Wire is exposing outside of equipment in Figure 13 (Other supplier’s Model). If operator use the machine for a long time in damp environment, that will be easy to make safety issue. So such design for waterproof equipment is not safe for operator. In Figure 12 (LISUN Model: JL-34), Wires are wrapped in plastic pipes, in that way, it can protect operator when operator use equipment. From a safety point of view, LISUN Model is also much better.

Figure 12: Wire of IPX3-IPX4 (LISUN Model:JL-34)
Figure 12: Wire of IPX3-IPX4 (LISUN Model:JL-34)


Figure 13: Wire of IPX3-IPX4 (Other supplier’s Model)

In all, before purchasing waterproof test equipment, please consider from different sides. Through the above comparisons, we believe that LISUN waterproof test equipment will be your best choice.

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, Spectroradiometer, Integrating Sphere, LED Test Instruments, CFL Test Instruments, Photometer and Colorimeter, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test , Dustproof Test Chamber, High and Low temperature Humidity Chamber, Plug and Switch Testing, AC and DC Power Supply.


Please feel free to contact us if you need any support.

Tech Dep: Service@Lisungroup.com, Cell/WhatsApp: +8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp: +8618917996096

What’s new: IEC 61000-4-5 Second Edition vs. Third Edition

IEC 61000-4-5 is part of the IEC 61000 series, which describes surge immunity testing caused by over-voltages from switching and lightning transients. The second edition of IEC 61000-4-5 was released in 2005 and has been in use for many years. The third edition was released as an EN standard in 2014. The general philosophy of the third edition is unchanged from the second edition. However there have been a number of refinements to the standard: additional explanation to clear up ambiguities, new descriptions that were not included in the second edition, and new (informative) Annexes that can be used to help in the application of the standard.

The purpose of this article is to outline the changes and additions that are now part of IEC 61000-4-5 3rd edition.

Critical Transition Dates

Transition from the second edition to the third edition is already taking place within the EU according to the following dates:19 Mar. 2015 – Date of Publication (dop): The third edition has to be implemented by publication of an identical national standard by CENELEC member countries.

19 June 2017 – Date of Withdrawal (dow): National standards that conflict with the third edition must be withdrawn (i.e. the second edition can no longer be used).
Wave Shape Changes

One simple, seemingly benign addition to the third edition was to add a definition for “duration”: actually three definitions because one voltage waveform duration and two current waveform durations have been defined. This changes how the time of the waveforms are measured, and may have a significant impact on the equipment used to perform some tests. The change most greatly impacts the 8x20uS short-circuit current waveform. Figures 1 and 2 compare the measurement from the 2nd and 3rd editions of the standard. Compare T2 in the second edition to Tw and Td in the third edition.
What’s new: IEC 61000-4-5 Second Edition vs. Third Edition

Another important change to the impulse waveform is that the 1.2×50/8×20 μs wave shape must be within the limits of the standard when the impulse is applied through a Coupling-Decoupling Network (CDN); specifically the 18μF coupling capacitor. While the open-circuit voltage waveform is not affected, the 8×20 μs short-circuit current wave shape will be significantly distorted by the addition of the 18μF capacitor, and the peak output current will be reduced by approx. 10% (depending on the design of the impulse generator). Figure 3 illustrates the problem: the normalized short-circuit output current of a nominal impulse generator is plotted against the same generator output into a 18μF capacitor. With the addition of the 18μF capacitor the peak current is significantly lower, and the waveform duration is shorter.
What’s new: IEC 61000-4-5 Second Edition vs. Third Edition

New CDN and Calibration Requirements

This new Annex A now contains the full description of the 10×700 μs impulse, including the waveform generator, calibration of the generator, the CDN to be used, and the calibration of the CDN. In the second edition (section 6.2) only the waveform, and calibration of the waveform were described. The new Annex A does not change any requirements other than the waveform duration definition previously mentioned. However, new requirements have been added, especially relating to CDN performance.

In the second edition, calibration of the 1.2×50/8×20 μs generator was described in section 6.1.2. In the third edition this is covered in section 6.2.3, and additional details have been added. The updates provide clarification regarding the type of equipment that should be used to perform calibrations, including specifications for current transformers (if used to measure short-circuit current). Similar details have been included in Annex A regarding the 10×700 μs impulse waveform. Section 6.2.3 also makes reference to Annexes E and G of the standard (both are new in the third edition). Annex E is quite useful, as it includes many figures that show the various waveform measurements in detail (rise and duration) for all of the waveforms.

Other Updates and Clarifications

For AC equipment, impulses are applied at 0, 90, 180, and 270-degree phase angles. The third edition provides some clarification for testing three-phase equipment: the phase angle is measured between the two Lines being tested (not Line to Neutral). Also, the new edition points out that when testing from Neutral to Ground, phase matching is not needed (because there should be no voltage from Neutral to Ground) and so this test should be treated similar to DC testing (five positive impulses and five negative impulses).

In summary, the changes in the third edition of IEC 61000-4-5 are likely to impact any organization that performs impulse testing or calibrates impulse test equipment.

Manufacturers of products that are tested to the second edition will most likely not require any product redesign, as the actual impulse tests are relatively unchanged. The third edition should result in a more consistent application of impulse testing, and greater repeatability of test results.

LISUN SG61000-5 Surge Generator is exactly according to the latest version of this IEC standard.
SG61000-5_Surge Generator

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, Spectroradiometer Integrating Sphere System, LED Test Instruments, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test ,Dustproof Test , High and Low temperature Humidity Chamber, Plug and Switch Testing,etc.

Please feel free to contact us if you need any support.
Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618917996096

Tuesday, March 10, 2020

What is the difference between IEC/ EN 60825-1 and IEC/ EN 62471?

IEC 60825-1: 2007 is a standard issued by the European Union, applicable to safety of laser products emitting laser radiation in the wavelength range 180 nm to 1 mm. Its scope of application would be only applied to LASER products after September 2010, and LED lighting products are no longer covered by the latest version of IEC / EN 60825-1, but need to be assessed in accordance with IEC / EN 62471.

IEC / EN62471 is a test standard for laser products (including LED) issued by the European Union. It is applicable to all lamps and lamp systems, including LEDs, incandescent bulbs, fluorescent lamps, gas discharge lamps, and arc lamps and other lamps and lamps, to evaluate the related light radiation hazards of different lamps and lamp systems. And it fully replaces the IEC / EN60825 standards on the LED product energy level requirements, and increases light biological requirements, including radiation intensity, radiance, etc. Moreover, it classifies product hazard levels according to the test data, Including the exemption level, low-hazard, medium-hazard, high-hazard level. The EU part of the standard EN62471: 2008 has been implemented in 2009.09.01 and EN60825 part of the LED will be completely invalid since 2010.09.01. EU Directive 244/2009 on energy efficiency requirements for non-directional lamps for domestic use also specifies that tests on UV content shall be carried out in accordance with IEC / EN 62471 (including energy saving lamps and incandescent / halogen lamps).

EN62471C light radiation safety testing system mainly measures the spectral power distribution, radiance, irradiance, radiation exposure, radiation exposure, specific effective radiation ultraviolet power, illumination, radiation exposure, radiation exposure, radiation exposure, source size, related color temperature, color, and color products of LEDs, LED module, LED lamp, fluorescent lamp, HID lamp, halogen lamp and other lighting products. Coordinate, color rendering index and color tolerance. The test parameters include ultraviolet radiation weighted irradiance, near ultraviolet radiation, retina blue light risk weighted radiation, retinal heat damage, infrared radiation, visible light and infrared radiation. The lamp can be classified according to the photo biological hazard.


In the past, there is no detailed measurement and evaluation method for the harm to human body caused by optical radiation. The traditional test method is to evaluate the content of ultraviolet or invisible light contained in the light wave. When the LED appears, we evaluate it with the same IEC / EN 60825 standard for laser product. But now, LED products are no longer covered by IEC / EN 60825-1: 2007, but according to IEC / EN 62471 for risk assessment. And IEC / EN 60825 is only suitable for laser products. IEC / EN 62471 is covered by the CE Low Voltage Directive (LVD directive 2006/95 / EC) and is also covered by the Artificial Light Radiation Directive (AORD 2006/25).

Why should you choose a constant current power supply for the LED driver?

The LED is a light-emitting diode, and its characteristic curve is basically the same as that of a normal diode. When the applied voltage reaches the diode conduction voltage, the slight change of the applied voltage can cause a great change in the diode current. The constant current is used to ensure that the current in the LED is constant. No matter how the voltage changes, the current flowing through the LED does not change, which can ensure the life and light decay of the LED.

If a constant voltage source with an output of 12V is used, an electric 16 ohm resistor is connected in series to supply three strings of 0.5W 5630 lamp beads. The lamp voltage is calculated according to 3.3V, the current flowing through the lamp bead Io=(12-3*3.3)/16=0.131A, and the power of a single lamp bead is P=0.131*3.3=0.4323W. Because the temperature of the lamp bead is high The voltage of a single lamp drops to 3V. At this time, the current Io=(12-3*3)/16=0.187A, the current increases by 56 mA., and the power becomes P=0.187*3=0.561 W, which exceeds the lamp power consumption. In the long run, it has a great influence on the life and light decay of LED lamp beads.

Therefore, the key to affecting the life of the LED is the temperature. When the LED temperature rises, the junction resistance decreases, that is, the conduction voltage decreases. At the same voltage, an increase in temperature will cause the LED current to increase, and the current will increase the temperature further, so that the vicious cycle will burn the LED. Moreover, the light decay of LEDs is also related to temperature. When the temperature rises, the light decay is intensified, and the phenomenon of bright and bright is appearing.

There are two reasons for the temperature rise: First, the quality problem, the thermal conductivity of the LED package is poor, the temperature in the LED die is not transmitted to the surface (internal heat and cool), even if the heat sink is added, the internals cannot be completely The heat is dissipated, and then some low-end products do not add a heat sink; the second is the temperature rise caused by the power supply. When the LED is turned on, due to its nonlinearity, the weak change of the power supply will cause a sharp change in the LED current, resulting in temperature.

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, Spectroradiometer, Integrating Sphere, LED Test Instruments, CFL Test Instruments, Photometer and Colorimeter, EMC & EMI Testing, Surge Generator, Electrical Safety Testing, Environmental Test Chamber, Waterproof Test , Dustproof Test Chamber, High and Low temperature Humidity Chamber, Plug and Switch Testing, AC and DC Power Supply.


Please feel free to contact us if you need any support.
Tech Dep: Service@Lisungroup.com,Cell/WhatsApp:  +8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp: +8618917996096