Abstract: The disclosure relates to a method for operating a heating device, with which at least one substance in at least one container is heated in a heating chamber by radiation. In order to simplify the procedure for the mixing and/or maintaining of the mixing of the substance, the container carries out a periodic main movement Ah in the heating chamber and at least from time to time carries out a shaking movement As overlaid on the main movement Ah, whereby the amplitude Asa, Asb of the shaking movement As is smaller than the amplitude r of the main movement Ah.

Abstract: In present-day laboratory work, the largest proportion of the time goes on operations at the laboratory balance. A laboratory balance (1) is therefore provided with an interface (19), with which the laboratory balance (1) can communicate with all the other devices customary in a laboratory. By means of the interface (19), command data as well as weighing-specific data can be transferred from the laboratory balance (1) to the other devices. The other devices can further process the weighing-specific data dependent on the command data, for instance. Furthermore, the other devices can transfer data reflecting the work results to the laboratory balance (1) by means of the interface. Furthermore, the other devices can also transfer control commands to the laboratory balance (1), which in the laboratory balance (1), depending on the evaluation of the weighing-specific data, release or block functions in the laboratory balance (1).

Abstract: A magazine-type sample rotation body (7) is arranged in a high frequency chamber (5) so that it rotates away from the horizontal, the body (7) accommodating, in fixed location, reactor blocks (10) that are sealed or sealable from fluids such that fluids contained in sample vessels in the reactor blocks can be mixed before, during and after high frequency exposure because of the rotational movement of the sample rotation body.