DIY LED meanwell driver issue.

[WindowMaker]

So I purchased a couple of meanwell 60-48p drivers from modular LED and I am having issues with them.

I have an arduino Uno setup on a basic sketch to output PWM at full tilt

with no LED's hooked up, my volt meter will not read above 33 volts, even when the driver is cranked up to full. To top that off, it took almost an hour for it to climb to 33 volts from the 18v it started at.

what am I doing wrong?

Thanks in advance.