22-02-2020, 08:42 AM
The 580 series weren't really part of the original 500 series. You can use 500 series plugins in a 580 series scope but you need a special adaptor, type 81. In my 1967 Tek catalogue the 580 series are in a different section to the 500 series. The 580 series are decribed as 85MHz in that catalogue. Some sources, including the tekwiki, say 100MHz but that was Tek's hope for the design. Getting 100MHz BW from the input socket to the CRT proved to be impossible to maintain in production.
Cold testing is indeed doing it without power applied. The insulation failure might have been apparent at low voltage from an ordinary DMM or it might have needed a high voltage to show it. Using a Megger or similar is fairly safe as the current is very limited. A crude and not very safe method is mains and a low wattage bulb. Will show serious insulation failure but not minor leakage.
Cold testing is indeed doing it without power applied. The insulation failure might have been apparent at low voltage from an ordinary DMM or it might have needed a high voltage to show it. Using a Megger or similar is fairly safe as the current is very limited. A crude and not very safe method is mains and a low wattage bulb. Will show serious insulation failure but not minor leakage.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
