Abstract: A multimeter has a housing with at least three input connections, configured as female connectors, for connecting to two measurement lines. When a measurement variable is changed, it is possible to connect at least one of the measurement lines to another input connection. The multimeter has a measurement-range switch which can be moved to a switching position associated with the selected measurement variables, and a mechanical blocking apparatus coupled to the switch. The blocking apparatus allows specific input connections to be blocked such that contact can be made only with the input connections which have an associated measurement variable which corresponds to the measurement variable set by the switch. The blocking apparatus is formed as a pivotable angle lever, and the switch moves end regions of strip-shaped angle limbs of the angle lever to a position aligned with the input connections to be blocked.

Abstract: An assembly for transferring data comprises a measurement data acquisition unit in the form of a portable measuring device, a measurement data processing unit, and an auxiliary unit for transferring data between the acquisition unit and the processing unit. Contact-less coupling elements are operatively associated with the acquisition and auxiliary units respectively for transferring measurement data between the acquisition unit and the auxiliary unit by contact-less coupling. Data are transferred between the auxiliary unit and the processing unit. The auxiliary unit includes a connecting member for mechanically detachably connecting the auxiliary unit with the acquisition unit such that the contact-less coupling elements face one another at a predetermined spacing and such that the connected acquisition and auxiliary units together form a portable measuring device.

Abstract: A multimeter with automatic measurement function setting and automatic recognition of measurement range includes circuitry having a high input resistance for carrying out the recognition of the type of electrical parameter to be measured. When the parameter being measured is recognized as an impedance, however, a low input resistance is automatically switched on, whereupon the magnitude of the impedance is measured at low input resistance and then is displayed, and if the range of measurement changes, the measurement procedure is repeated from the beginning.

Abstract: A housing for equipment in electrical systems, which is suitable for fastening to a wall or bottom surface, includes a substantially parallelepiped housing body. A bottom part is secured to the housing body and has an outer surface. A replaceable or interchangeable fastening adaptor is adapted to an intended type of wall or bottom fastening. Retaining elements, which are preferably of the same material, are formed on the outer surface of the bottom part for enabling the fastening adaptor to be slipped on.

Abstract: An apparatus for detachably fastening an equipment housing to a profile rail, preferably a top-hat rail mounted on a wall or bottom surface, includes guide strips. At least one clamp part slides on the guide strips and engages the profile rail in a clamping position like a tong. The at least one clamp part is retained in a clamping position by spring force operating in a given direction and is displaceable into an open position counter to the given direction for loosening. At least one locking part is displaceable relative to an equipment housing and is coupled to the at least one clamp part. The at least one locking part and the at least one clamp part occupy at least two positions defining a mutual spacing. The at least one locking part blocks the at least one clamp part in one of the positions for preventing the at least one clamp part from being displaced into the open position for loosening the equipment housing from the profile rail.

Abstract: Portable measuring device, including a measuring instrument, a carrying strap fastened to the measuring instrument for hanging the measuring instrument around the neck, measuring lines electrically connected to the measuring instrument and passing through at least part of the carrying strap, measuring probes connected to the measuring lines, the measuring lines being in the form of flexible spiral cables between the carrying strap and the measuring probes, and at least one mounting disposed on the measuring instrument for fastening unused measuring probes hanging on the measuring lines.

Abstract: Digital measuring device, including a trigger generator having an input for receiving an analog measuring input signal, a variable delay line being connected to the trigger generator and having an output, an analog/digital converter receiving the analog measuring input signal, a transient memory connected to the analog/digital converter, a picture refresh memory connected to the transient memory for storing the measuring input signal, a Walsh function generator connected to the picture refresh memory, a liquid-crystal picture screen being connected to and addressed by the Walsh function generator, the output of the variable delay line being connected to the analog/digital converter, the transient memory and the picture refresh memory, and a selectable time base being connected to the variable delay line, the analog/digital converter and the transient memory.

Abstract: Multi-purpose measuring device with a tilting display which includes a display assembly with a housing for visually indicating a measured value of a variable to be analyzed, an auxiliary assembly with another housing separate from the display assembly housing for performing measurements, a hinge interconnecting the housings permitting relative tilting of the housings in two directions into different planes at an angle relative to each other and into a common plane, and a carrying strap fastened in vicinity of the hinge, the auxiliary assembly having dimensions and weight in proportion to the display assembly causing the center of gravity of the measuring device to lie in vicinity of the auxiliary assembly and causing the auxiliary assembly to hang downward from the carrying strap with the display assembly disposed above the auxiliary assembly.