Ive got a Varian 979 leak tester, however after a few runs the fine leak test does not work. If I use "Read standard Leak" then after it fails to switch on fine leak test.
Can you please point me in the correct direction.
John, there are four reasons the leak detector will not enter "fine test". One is if you have the green sniffer button pressed (maybe accidently). Two is if you have enabled a range stop in the menus. Three, the test port pressure must be below 100 mT. Four, the leak rate reading must be less than 1 E-7, and trending down. Check it out and let me know. Or call me at 800 882-7426, option 5.