A method and arrangement is provided to form a gas-tight joint between two housing portions, e. Once changing viewing preferences are identified, the disclosed television programming recommender can adapt the generated television program recommendations to such changes in viewing preferences, or more efficiently manage the storage of the viewing history. The absorption of radiation by the matrix cluster ions produces dissociation of the matrix cluster ion into fragments having mass-to-charge ratios that lie below a mass-to-charge ratio range of interest. The test circuitry full wave rectifies AC current returning from the DUT, and the test controller controls a switch in the test circuitry.