@ Dennis
I think our scales work exactly the same, except yours may not drift like mine.
I too calibrate using the supplied weights, then put the empty pan on the scale, and press ZERO. It now reads 0.0. When I lift the pan from the scale, it reads "-114.5", since my pan weighs 114.5 gn. When I put the empty pan back on it, it should automatically read 0.0. Any deviation from this, ie. "-114.6" when i lift the pan or "0.1" when I set it back on, is cause to reset the ZERO button. I hope that makes it clearer.
From reading customer reviews on Midway USA and Cabelas, it sounds like the 1500 you have is a better scale than my 750, so yours may not have these issues. And yes, Dave, definitely turn off the ceiling fan before using. Also, Dave your "avatar" photo cracks me up!

Quinny, how did those 175's do today?