Hi Pot Testing
"dielectric breakdown testing?"
Automated hipot testing makes it possible to produce fully trWith dielectric breakdown testing you are trying to answer the question "How much voltage can I apply between the wires before the insulation fails?" You increase the voltage until the the current suddenly increases. You are finding the highest voltage the cable can stand before it fails. Once the cable fails it is usually damaged or destroyed. aced records of electronic
What is "dielectric
withstand testing"
In dielectric withstand testing you are trying to answer the question "Will this cable withstand a required voltage for a required time?" You apply the voltage for the amount of time and watch the current that flows. Ideally no current flows and the cable is not harmed.
What is "insulation
resistance testing"
In insulation resistance testing you are trying to answer the question "Is the resistance of the insulation high enough?" You apply a voltage and very carefully measure the current. You then calculate the insulation resistance using Ohm's Law (R = V/I).
How do these "hipot" tests
affect quality?
All of these tests are tools you can use to better understand how a cable will perform and to monitor any changes in the cable's performance.
Dielectric breakdown testing is used in product design and qualification stages. It helps establish the maximum voltage of the design. It can also be used on a random sample basis to verify that the maximum voltage is not changing. Dielectric breakdown testing may be required during the development of assemblies used in critical applications.
Many test specifications require a Dielectric Withstand Test on every cable produced. The test is usually done at about 75% of the typical breakdown voltage. It is done as a safety net. The test is sensitive to arcs or corona so it often finds terminal spacing problems, over-mold problems, tolerance errors in IDC cables, or any problem that might produce arcs. This test doesn't significantly degrade the cable.
The Insulation Resistance test is typically done on every cable tested. It is usually done at 300 to 500 Vdc with 100 to 500 Megahoms resistance. The test is a very sensitive to contamination in the assembly process. Solder flux, oils, mold release agents, and skin oil all can cause problems. This test excels at identifying insulation that will conduct in the presence of moisture. Doing this test on every cable allows you to detect contamination changes in the manufacturing process.
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