Abstract: A multimeter instrument for measuring variables, such as electrical current, voltage, or resistance includes touch-sensitive zones for selection of the variable to be measured. The measurement circuit associated with the variable selected with the aid of touch-sensitive selection zones is activated by the zone selected.

Abstract: The invention pertains to a multimeter instrument for measuring a plurality of variables, such as the current or voltage of an electrical signal or the electrical resistance of a circuit, the instrument comprising a plurality of measurement means each associated with a predetermined variable, and device (20) for selection of the variable to be measured.

Abstract: An acquisition process for signal sampling includes high-speed analog signal sampling, storing the samples of the analog signal in a matrix of memory cells, and re-reading the samples from the cells at low speed. Two identical memory devices are provided in each memory cell. One sample of an analog signal is stored in one memory device, and one sample of that signal that is out of phase is stored in the other memory device.

Abstract: The invention concerns an acquisition process by analog signal sampling.

Abstract: An arrangement for measuring alternating or direct current based on the magnetic field generated by the flow of the current includes a sensor for sensing the magnetic field generated by the flow of the current, a measuring circuit for determining the current from the magnetic field, and a device for sensing an external parasitic magnetic field and producing a correction signal applied to the measuring circuit for accurate measurement of the current.

Abstract: A polarized bistable electromagnetic relay arrangement comprising at least two monostable instantaneous electromagnetic relay devices with a L-shaped yoke, a permanent magnet disposed between both relay devices so that one magnetic pole be magnetically connected by polar masses to both yokes of the relay devices and polar masses magnetically connect the other pole of the magnet to both blades whereas the magnetic circuits of both relay devices are designed so that the magnetic flux produced by one energized coil passes in series through both blades while superposing themselves to the magnetic flux produced by the permanent magnet.

Abstract: A device for quantified analog display, with planar structure, and measurement apparatus with multiple ranges and multiple operating modes using this display, which visualizes in analog form a value of a selected measured quantity among several. The display device comprises a flat substrate (2), a succession of identical electrodes (6) arranged side by side on one face of the substrate, and selectively excitable, and with at least one graduated scale (7) adjacent to the succession of identical electrodes (6) to determine the value of the measured quantity, in combination with at least one electrode of the succession of identical electrodes.

Abstract: A multi-wavelength light emitting and receiving apparatus for monitoring connections by optical fibers comprising a case, an emission section, a reception section, a keyboard for selecting operating modes and measurement scales, a display arrangement, a processing unit including a microprocessor connected to the emission section, the reception section, the keyboard and the display arrangement, and a feed. The emission and reception sections are mounted in a drawer provided with a connector that can be inserted into a complementary connector provided in the case, this latter containing the keyboard, the display arrangement, the processing unit, and the feed.

Abstract: A Hall-effect current clamp, in which the constant-current generator (13) supplying the Hall-effect cell (8) comprises an operational amplifier (15) which has an internal-voltage reference (17) and which pilots a transistor (Q1) mounted in emitter follower in series with the cell (8), such that the current which traverses it is on the order of 1 mA. At the output of the measurement amplifier (14) of the clamp, a dividing bridge (P1,R5) whose intermediate lead is connected to the inverting (-) input of the amplifier (14) permits obtaining a supplementary amplification of the output signal of the clamp at the price of a low current consumption. Thus, the total current consumption of the clamp is maintained at a very low level, thereby providing a considerable increase in the life span of the batteries (9) used to supply the clamp.