How to Choose the Right Hipot Tester to Get the Job Done
Hipot testers provide a variety of capacities, beginning with dielectric resistance and insulation resistance testing and, in many situations, offering precise low-resistance measurements and low-resistance/high-current outputs to test ground resistance and ground bond integrity. Selecting the correct one for your application would potentially save both time and cost in conducting the required checks.
Types, Specifications & Features
Product Safety Certification
Before approaching the individual functions, it is important to determine that hipot testing is a common word. Real processing will require different hi-pot testing equipment to be used, depending on whether the substance is to be marketed and used. The specifics of what constitutes a certified product depend on the number of safety requirements and the world’s area in which the item is marketed and used. Standards setting up organizations shall include:
The simple hipot tester shall add a high voltage from the conductors to the under-testing chassis. This test is also referred to as dielectric or voltage resistance. It aims to confirm that the insulation and separation of the non-conducting surfaces from the working voltage are adequate to prevent the possibility of shock. Typical parameters for this test are: 2x (normal operating voltage) + 1000V.
Higher voltages will also be defined in the tested norm for dual-insulated goods. Usually, this class of devices includes special fixtures to connect the non-conductive external shell to the conductive portion.
Defects frequently detected in the hipot tester include corrosion (dirt, debris) and lack of proper separation (creeping and clearance) of the materials. Creeping is measured across surfaces; clearance is the air distance between the elements. Contamination is likely to produce an unsustainable amount of leakage present. Issues of clearance may result in a breakdown.
Insulation resistance testing is likely to be needed in engine winding, transformer winding, and other applications involving cable or insulated wire. Insulation resistance testing generally requires ensuring that the resistance reaches the given high resistance value.
In several cases, insulation strength between many conductors needs to be measured. Examples cover cable/connector assemblies, multi-conductor cables, and relays. Both conductors except one are shortened together to allow this calculation, and the test voltage is applied from the remaining conductor through the packed conductors.
Where ground continuity tests the safety ground connection’s resistance, the ground bond test guarantees the consistency of the connection. The high current is transmitted through the circuit using the same test configuration. If the ground bond is secure, the current passes without a change in resistance. If weak, the resistive heating of the current will cause the bond to fail.
Electrical protection checks are a universal prerequisite for electrical and electronic devices. Checking unique geographic specifications can be a difficult job that simplifies the programmable features and advanced hipot tester capabilities. Reviewing the testers’ desired features based on the objective test criteria will result in more effective and accurate tests.
The tester that makes the test engineer’s job simpler, quicker, and more complete should be the tester of choice. In general, rates for mortgage testers have declined in recent years, making more options. Product guidelines may lay down safety criteria based on values, study, and practice. Still, the overall responsibility for testing a safe product rests not with the specification but with the manufacturer and the testing capability it employs.