A belt feeder is a mini conveyor belt that you put feed on and it turns on and off based on time you set, then dumps feed in based on the on time. You do have to measure the food out quite precisely, and make adjustments as you go.
Actually I think you have that mixed up with another type of feeder. There is no time to set or feed dumped in based on the time you set. You simply pull by the belt which is spring loaded and the feed is dumped in at a slow even rate as the spring unwinds. The amount of feed dumped in is simply based on how much feed you load on the belt.
