I bought this Faulty Helena Biosciences EPS 600 power supply on eBay with the intent of fixing it. There was an error displaying on the screen but it was 90% working, the system start boot up check detects something wrong somewhere. But I realised that this can put out a lot of voltage, I believe I saw 345v on the output at some stage.
That's because this thing is a power supply designed for gel electrophoresis... You apply voltages of up to 3.5 kV to a chamber filled with a gel and some DNA on it and apply a high DC voltage. Molecules of different sizes will drift at different speeds-> you can separate them. Given the fact that it has "600" as a model number i'm willing to bet that it goes to 600V DC and probably 100-250 mA max. Those things are okay-ish as cheap HV power supplies, but don't count on it being extremely accurate.
EDIT: Have you checked if you have triggered some kind of safety switch? Those things are HV PSUs designed to be used by people who have no clue about electronics, so they usually have a lot of safety mechanisms to make sure no one electrocutes himself. Here's a list where those switches might be:
-at the gel chamber to prevent you from opening it while the PSU is running
-at the banana plugs, mine won't even power on if you haven't inserted the cables
-something against earth loops
-check the timer, they are designed to run a few hours->might stop outputting HV if the timer reaches 00:00