As others mentioned, you can't generally measure insulation resistance with an AC hipot test. However, there are good reasons to set both upper and lower trip current levels on your hipot tester: it's a good check on proper construction.
Suppose you find your product X normally conducts 30 (+/- 10%) mA at your AC hipot test voltage. Then setting trip levels at 25 and 35 mA will pass all properly-constructed products, but screen for missing or incorrect filter capacitors, missing ground wire, etc. Note this has nothing to do with agency requirements. But since you must do the test, you might as well get some very useful information from it. I+ve seen this process prevent several costly recalls. ---------- From: Raymond Li To: EMC & Safety Forum Subject: Permissible limits of leakage current and insulation resistance List-Post: [email protected] Date: Wednesday, October 15, 1997 2:36AM
