[en] The rotor windings of large turbogenerators are generally cooled by passing hydrogen through hollow copper conductors. A rig has been built to measure the effects of rotation on flow and heat transfer in such cooling systems. It models a commonly used geometry, namely a duct rotating about a parallel axis, but using air as a working fluid. Tests have now been completed with a second test section that includes static pressure tappings as well as a heater and thermocouples. The aim with this test section was to measure the static pressure drop as well as heat transfer in a heated rotating tube. The aim of this Report is to describe the second test section and also the associated changes that have been made to the rig itself and the computer software used with it. Various investigations have been made as part of the commissioning of the rig with the second test section, and they are reported here. A subsequent Report will describe the results that have been obtained for conditions corresponding to actual generator rotors. (author)