PAT tester that has the ability to perform an earth continuity test with a test current of no more than 200mA. If you use a higher current, there is a serious danger that the motherboard of the computer could be damagedThe computer must also be subjected to a visual inspection. Check the tower and associated equipment for obvious problems, and if there's any doubt about safety, fail it immediately and recommend repairs to the correct person.If the computer passes the visual test, use the IEC lead you tested earlier to plug the computer directly into your PAT tester. You should then use the earth bond lead to touch the bare metal (usually on the back of the computer) before performing the following test procedures:
- Earth continuity test at 100 or 200mA - Remember not to use a current more than 200mA as this can damage your computer internally!
- Insulation test at 500V DC or (for older computers) a leakage test to ensure safety
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