For a while now I have been having some problems with ground loops that are due to the diagnostics (in this case thermometry) in the my measurement setup. Unfortunately there is no "easy" way to solve this problem without breaking the connection to earth (=safety ground) and let some of the measurement electronics float or be grounded via the measurement leads. Now, the obvious solution to this problem is to use an isolation transformer where the "earth" on the secondary is not connected to safety ground on the primary. However, I can't seem to find a supplier of this type of transformer here in the UK. There are plenty of "isolation transformers" available from RS, Farnell etc but they are really "safety transformers", they won't break the connection to ground which is what I need. The only types that I have seen that DO let equipment float are intended to be used on boats ("shorecraft") and are not really suitable for a lab. Does anyone know of a company that sells these things here in the UK? I don't need a big transformer, something like 300VA would do, but ideally it should be portable (i.e. not meant for permanent installation) and have 2-3 outlets. (I should say that I used transformers of this type when I was still working in Sweden, so I am aware of all potential problems when it comes to safety etc).