Abstract: A medical handheld device having a bi-stable display, which can be supplemented by a further display, is presented. The display of the medical handheld device can have a display surface. The display surface can have a keypad in the form of a matrix of sensors. The matrix of sensors can be coupled to image segments on the display surface and can detect touches on the display surface. By coupling the matrix of sensors to the image segments of the display surface, a change of the representation of touched areas of the display surface can occur.

Abstract: An optical device under test—DUT—having m inputs, with m=1, 2, 3, . . . , M, and n outputs, with n=1, 2, 3, . . . , N, is tested by applying a plurality of different characteristic stimulus signals to at least one of the m inputs. A response signal is received at at least one of the n outputs, and a property of the DUT can be determined or verified by evaluating the received response signal in conjunction with at least one of the applied stimulus signals or at least an indication thereof. The plurality of different characteristic stimulus signals are provided in a way allowing tracing each respectively applied stimulus signal in each received response signal—if present or beyond a detectability threshold.

Abstract: In order to raise the measuring accuracy of a Coriolis-type mass flow rate meter in a cost-effective fashion, the latter comprises a measuring tube (4), a subcircuit measuring circuit and a subcircuit exciting circuit. Two vibration sensors (17, 18) and a vibration exciting (16) are arranged on the measuring tube. The vibration sensor (17) is assigned the amplifier (v1) in the subcircuit measuring circuit, and the vibration sensor (18) is assigned the amplifier (v2). Downstream of the two amplifiers are the summing stage (ss1) with a downstream integrating stage (ig), and the difference stage (ds). Downstream of the integrating stage (ig), the difference stage and the amplifier (v1) are the A/D converters (aw1, aw2, aw3), following which the digital processor (dp) is connected; it supplies the digital mass signal (m) and/or the digital density signal (d), as well as the gain control signal (v) for the amplifier (v2).