This section provides an overview for dielectric withstand testers as well as their applications and principles. Also, please take a look at the list of 13 dielectric withstand tester manufacturers and their company rankings. Here are the top-ranked dielectric withstand tester companies as of December, 2023: 1.Finero, 2.Fluke Europe B.V., 3.HIOKI E.E. CORPORATION.
A dielectric withstand tester is a device that checks whether an electric product or its components are sufficiently insulated when a voltage is applied to them.
Insulation resistance testers are used to evaluate insulation performance, but voltage withstands testers differ in that they apply a voltage high enough to actually cause a dielectric breakdown.
In addition, the insulation resistance tester evaluates insulation capability quantitatively, whereas the dielectric withstand tester evaluates qualitatively whether insulation is broken or not. They are also called dielectric strength testers.
Rather than quantitatively measuring insulation performance like an insulation resistance tester, dielectric withstand testers are used to confirm whether or not insulation breakdown occurs.
Withstand voltage tests using dielectric withstand testers are included in safety standards not only in Japan but also around the world, and together with insulation performance tests using insulation resistance testers and protective continuity tests, manufacturers of electrical products are required to conduct these tests in the final process to confirm that there is no risk of electric shock or electric leakage. The following table shows the principle of voltage resistance testers.
Dielectric withstand testers apply a high voltage to an object to be tested to see if it causes dielectric breakdown.
Dielectric breakdown is when an insulator suddenly begins to conduct current at a certain time or voltage when voltage is continuously applied to it.
Dielectric withstand testers apply a very high voltage (10 to 20 times the voltage applied in normal use) to the object under test and measure whether or not a sudden increase in current due to dielectric breakdown occurs.
The basic configuration is the same as that of an insulation resistance tester, consisting of a power supply, an ammeter, and a current protection element placed upstream of the ammeter, and a switch to start and end measurement.
In general, most electrical products operate on AC power, and many problems, such as overvoltage, are also caused by AC, so it can be said that this test is suited to the actual situation. Insulation resistance testing is performed on-site during maintenance and inspections regardless of the manufacturing process, while withstanding voltage testing is performed on all products at the factory.
Before using dielectric withstand testers, an initial inspection is required. Without this initial inspection, accurate testing cannot be performed. In addition, high voltages are generated during the test, and failure to perform the inspection may injure the tester.
Since specific inspection methods vary by manufacturer, please read the instruction manual carefully before inspecting.
In general, the following items are to be checked:
”Whether the tester is grounded to the earth”
”Whether there are no cracks or damages on the exterior of the tester”
”Whether there are no cracks or damages on the measurement leads and sheaths”
In addition, the voltage that withstands the tester should be calibrated periodically. Calibration is the process of adjusting the measuring equipment to ensure that it is measuring correctly and inspecting whether the voltage withstands the tester is functioning properly. If the voltage tester has never been calibrated since its purchase, you do not know if it can be tested. It is possible to calibrate a voltage tester by yourself, but it must be done by someone with sufficient knowledge and skills because high voltages may flow through the tester. Therefore, it is generally recommended to have a professional manufacturer calibrate dielectric withstand testers once every six months to several years.
Dielectric withstand testers are also available for rental. However, when selecting equipment, how much applied voltage is needed? Will you be testing DC or AC? At the very least, it is necessary to consider the following questions.
The dielectric withstand testerss available for rent are available in a variety of types with different functions. Types that can display voltmeters and ammeters digitally can reduce the risk of misreading measurements. Some models are also capable of insulation resistance testing, so if you want to perform insulation resistance testing, one unit is all you need. Renting a high-performance model that you do not need will result in unnecessary costs, so make your selection by carefully comparing it with your actual usage.
Rental fees for voltage resistance testers range from 20,000 to 100,000 yen per month, depending on the functionality.
*Including some distributors, etc.
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YASUDA SEIKI SEISAKUSHO, LTD., founded in 1955 with headquarters in Japan, is a manufacturer of material testing machines. The company's wide range of products includes rubber testing machines, electrical and magnetic wire testing machines, leather testing machines, and dye testing machines. YASUDA SEIKI SEISAKUSHO, LTD.'s testing machines are used to evaluate and quantify the physical properties of materials and can be found in research, industrial, commercial, and governmental organizations. The company offers customer support, including repairs and troubleshooting services.
Hopetech Electronic Technology Co., Ltd. (Hopetech) is a Chinese manufacturer of laboratory equipment and analytical instrumentation established in 2009 in Changzhou, Jiangsu. The company primarily produces liquid and gas chromatographs, spectrophotometers, rheometers, and refractometers. These supply China’s educational and research institutions, as well as clients in energy production and environmental protection. Hopetech conducts independent quality management and R&D operations from its main 2,000sqm Changzhou facility, and maintains a global sales network across six continents.
KIKUSUI ELECTRONICS CORP., founded in Yokohama, Kanagawa in 1951 is a manufacturer od electronic measuring instruments, electronic loads, and safety test equipment. The company's product portfolio includes Electrical Safety Testers, EMC Testers, Harmonics and Flicker Testers, Battery/Capacitor Testers, and AC Electronic Loads. The company serves industries such as Oil and Gas, Aerospace and Defense, Automotive and Transportation, Construction, and Power Generation. The company provides services such as Product Selection Guidance, Engineering Support, and Custom Manufacturing.
GW Instek or Good Will Instruments is a Taiwanese instrument maker founded in 1975. GW Instek has over 300 product lines, which include Oscilloscopes, Spectrum Analyzers, Signal Sources, Basic Tests and Measurement Instruments, Safety Monitoring Systems, and more. Leading manufacturers choose them as their test and measurement provider. GW Instek has become the leading brand in the electronic test and measurement industry. They help electronic industries reduce testing costs and increase competitiveness. GW Instek has subsidiaries in five countries and is sold to more than 80. Their mission is to reduce total costs and create customers value from cost savings.
Finero Ltd. is a manufacturer of test and measurement systems and equipment based in Finland. The company manufactures equipment needed for electrical safety testing which involves checking the conductivity of high voltage, grounding, and insulation resistance. Their other product list includes software for different measuring devices, shielded high-voltage adapters, Bus-controlled relay matrices and etc. They also supply Condition test cabinets like thermal and vacuum cabinets, comfort cabinets and rooms, and thermal cycling cabinets. These products have various applications such as testing gas metering modules, safety testing of cooking appliances, test equipment for lighting/heating elements, and more.
Interpower Corporation established in 1975, and has headquarters located in the USA, and the UK, is a manufacturer of international power cords and related products to customers worldwide. The company’s North American stock of products centralized in Iowa include international power cords and cord sets, plugs and sockets, hospital-grade products, and IEC 60320 accessory power distribution units. The UK division of the company serves mainly the European market. Interpower Corporation is also ISO 9001:2015 certified.
Fluke Calibration, established in 1948, headquartered in Everett, Washington, is a manufacturer, distributor, and supplier of precision calibration equipment and software. Their products include temperature calibrators, electrical calibrators, and pressure calibrators, serving industries such as aerospace, automotive, manufacturing, and pharmaceuticals. Their calibration solutions ensure accurate measurements, compliance with industry standards, and traceability. Their products are used to calibrate and maintain the accuracy of instruments, making them essential tools for industries that require precise measurements and consistent performance.
Changzhou Tonghui Electronic Co. Ltd., established in 1994 and headquartered in Jiangsu, China, is a manufacturer of electronic test and measurement instruments. The company's main products include an LCR bridge, impedance analyzer, benchtop type LCR meter, and TH9010A hipot tester. It also provides a handheld LCR meter, DC bias current source, four channel voltage, and TH7110/TH7120. Its product has a resolution of 10 mHz, which allows for precise measurements. The company was identified as a "Hi-tech Enterprise of Jiangsu Province" in 2009. It serves industries such as telecommunications, aerospace, automotive, and medical devices.
HV Hipot Tester Electric Co., Ltd., founded in 2003 and based in China, is a manufacturer of electrical safety testing equipment, especially high voltage testing equipment. The company is a national high-tech organisation that has a 2000-square-meter 8S contemporary management and manufacturing facility and around 1500 square metres of high-tech, intelligent office space. Products from the company are utilised in the diagnostic assessment, proof testing, and preventive maintenance testing of electrical cables. It evaluates various electrical equipment, including GIS systems, transformers, circuit breakers, surge arresters, and generators. The company holds ISO and CE certification.
B2 Electronics, established in 2001 and headquartered in Vorarlberg, Austria is a manufacturer that specializes in high voltage testing, specifically VLF cable testing. The company offers a range of products for high-voltage testing, including VLF test sets, cable fault locators, and partial discharge measurement systems. It also offers software solutions such as the BA Control Center. Its VLF test sets are compact and portable, with an unmatched high voltage output power-to-weight ratio. It serves a wide range of industries such as power utilities, electronics manufacturing, appliances, and electrical.
TEXIO TECHNOLOGY CORPORATION has been in operation in Japan for over 60 years. TEXIO specializes in custom orders of a variety of different products including power supplies. TEXIO also specializes in DC power supplies, oscilloscopes, multimeters, function generators, and safety testers.
Hioki E.E. Corporation was founded in 1935 and headquartered in Ueda, Nagano. Hioki provides testing & analysis, manufacturing & inspection, and equipment maintenance to industries including mobility, battery, motor, energy, electronic components, and infrastructure. Hioki’s has 10 primary product categories which are: recorders and data loggers including oscilloscopes, LCR/Resistance Meters, safety testing including signal generators and calibrators, power meters including power quality analyzers, probes & sensors, optical & PV maintenance & telecommunication, environmental measuring, DMM & testers & field measuring, IoT & new solutions & meter relay, and bare board & package testing.