hissssss noise on soundcraft notepad 12 fx

taranjit

i have bought a new soundcraft notepad 12 fx . when i increase the gain above half it makes a hissssss kind of sound . is it normal ? when i connect it through usb the volume that gets recorded is very less . i have to normalize it due to which that hissssss noise increases a lot . i am using a dynamic mic shure sv 200 .