High Voltage Testers

High voltage testers are specialized instruments designed to evaluate the dielectric strength and insulation integrity of electrical components, cables, transformers, and assemblies. These instruments apply controlled high voltages — often ranging from hundreds of volts to several kilovolts or beyond — to verify that equipment can withstand operational and surge conditions without insulation breakdown. High voltage testing is a critical step in quality control, acceptance testing, and ongoing maintenance programs for electrical and electronic systems.

Used extensively in manufacturing and field environments, high voltage testers include hipot testers, dielectric withstand instruments, insulation resistance meters, and high-resistance electrometers. They are essential in industries where insulation failure can result in equipment damage, safety hazards, or regulatory non-compliance. Applications span automotive safety systems, semiconductor characterization, power equipment manufacturing, and aerospace & defense.

Typical Applications

Hipot (dielectric withstand) testing of cables, transformers, and switchgear during manufacturing and acceptance testing
Insulation resistance measurement on motors, generators, and high-voltage power equipment in industrial maintenance
High-resistance and leakage current measurement in semiconductor devices and precision electronic components
Airbag initiator and safety-critical electrical device testing in automotive manufacturing
High voltage matrix switching and multi-channel production test systems for electrical component characterization

Popular Brands

Keithley (now part of Tektronix) offers advanced electrometers and high-resistance measurement systems used in semiconductor and materials research laboratories. Vitrek specializes in high voltage switching systems and hipot testers for automated production-line testing. Keysight provides high-precision electrometers and source-measure units capable of ultra-low current and high-resistance measurements for R&D and component characterization.