[Elecraft] Best way to check ATU function?

[Tim and Nancy Logan]

Hi folks - 

My ATU doesn't seem to be doing a lot of retuning when I shift between
bands lately. I use a 260' horizontal loop. For example, I can shift
between 20 meters and 30 meters and the ATU will act as if it's already
tuned when you push the Tune button - and show me a 1.1. No relays
clicking at all. The ATU is in AUTO mode. I'm just having a lot of
trouble believing that it is tuning to the maximum. It seems that in the
past it did more "retuning". Can someone suggest the most practical way
to check if the ATU is functioning properly. (I know I'm going to feel
stupid when I hear this answer hi hi). 73/Tim Logan NZ7C