Hi guys I'm after some help. The device is in an ophthalmic piece of equipment which has 4 15 watt small fluorescent tubes powered from a board mounted electronic ballast. It has a 12vdc class 2 power supply. Problem is, even with new tubes it will fail to ignite the tubes if it's recently been turned off and on, leading to us having to leave it on all day. A few different power supplies have been tried, and even tried a ferrite core around the lead from the supply to the board as an oscilloscope shows lots of noise on the supply lead when the lamps are on. Any ideas? Thanks in advance.
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