Abstract: A single-torus ohmmeter for measuring a loop impedance Zx, includes a single transformer having a primary winding of Np coils and a secondary winding of a single coil forming the measurement loop, in which, to compensate for a stray induction produced by an AC leakage current circulating in the measurement loop without canceling a measurement current Ip generating an alternating induction of constant average value for the measurement of the loop impedance Zx, the transformer includes a second secondary winding of Na coils whose output voltage Ub representative of the AC leakage current is delivered to a processing module providing a voltage intended to be added to an alternating measurement voltage Vp in an adder delivering the current to be injected into the primary winding after passage through a voltage-current converter.

Abstract: The invention relates to a measurement clamp comprising a fixed jaw and a moving jaw, the fixed jaw comprising a first magnetic core entirely surrounded by a first magnetic shield and the moving jaw comprising a second magnetic core entirely surrounded by a second magnetic shield, the first and second magnetic cores being separated by two diametrically opposite air gaps each receiving a magnetic flux sensor, and an external flux-cancellation coil surrounds one or the other, or both, of the first and second magnetic shield.

Abstract: A process for identifying the usage of electrical equipment connected to a power supply grid has an asynchronous motor coupled to a charge including identifying the usage of the electrical equipment by using an electrical signature of this equipment. The electrical signature is determined in a previous step and consists of a limited and predetermined set of characteristic frequencies and their harmonics obtained from the only information featuring on the identification plate of the asynchronous motor, and from visual inspection of the charge and its method for coupling to the asynchronous motor.

Abstract: Portable device for a contactless measurement of a current passing through an electrical conductor, the device including a measuring module and a processing module, the measuring module, configured to be held by an operator in contact with the conductor in a plane substantially orthogonal to this conductor and without clamping this conductor, including one or two pluralities of magnetic field sensors, and the processing module being configured to perform a determined linear combination of the plurality of signals delivered by one or the two pluralities of magnetic field sensors, so as to perform an angular spatial filtering isolating the current to be measured from other disturbing currents passing through other conductors.

Abstract: A switch mode power supply comprises a power converter including a transformer having a primary winding connected to a primary circuit, and a secondary winding connected to a secondary circuit delivering an output voltage to a load. The primary circuit comprises a controller for operating a switch element to chop the current flowing in the primary winding to transfer energy selectively to the secondary winding. The secondary circuit comprises a storage capacitor delivering the energy to the load, a first regulator receiving the output voltage and delivering a first control current for the controller via an isolator element, and a second regulator receiving an auxiliary output voltage that is an image of the output voltage and delivering a second control current for the controller. The second control current is added to the first control current to avoid any interruption in the chopping of the current flowing in the primary winding.

Abstract: An arrangement for the spectrometric measurement of products, such as cereals, oleaginous products, or derived products, includes a mechanism for selective adjustment of the position of a light beam in vertical and horizontal planes, and a selective adjustment device for ensuring that rays of the light beam are parallel.

Abstract: An earth clamp for testing contact voltage, comprising a measuring circuit formed of a voltage inducing transformer and a current measuring transformer, adapted to be mutually coupled by an earth conductor whose earth impedance is to be measured, a microcontroller to deliver an alternating voltage to the voltage inducing transformer and, in response, to receive a reference voltage generated in the earth conductor and an earth current iB+iF induced in the current measuring transformer, the microcontroller being configured to extract an amplitude E of the reference voltage, an amplitude IB and an amplitude IF of the earth current and a phase shift ? between the reference voltage and the loop current iB and to calculate the earth impedance Zb at a determined frequency, the microcontroller also computing the contact voltage Uc at said determined frequency by the product of the earth impedance times the amplitude IF.

Abstract: A clamp for measuring a ground loop current includes a first jaw secured to a fixed support and a second jaw pivotally mounted on the fixed support, and pivotable between a position closing the clamp and an open position, and an elastic element for returning the movable jaw to the closed position. The clamp includes a device scaling down the force required for opening the clamp, by application of the force to a trigger. The device is mounted between the elastic return element and the trigger, upon opening the clamp.

Abstract: The invention relates to an analog isolation device (100) comprising a primary part (102) and a secondary part (104) separated by an electrical isolation barrier, these parts including a high-frequency channel configured to produce a high-frequency component in the secondary part and a low-frequency channel configured to produce a low-frequency component in the secondary part, in order to form the output signal from the high-frequency and low-frequency components, the device further including a control circuit (D1, 132) configured to receive, in the primary part, a setpoint signal (Sic) and a so-called image signal (Soim) representative of the output signal (So) and to apply in the high-frequency and/or low-frequency channel a correction signal VCOR as a function of the difference between the image signal and the setpoint signal in order to cause that difference to tend toward zero.

Abstract: A clamp for measuring a ground loop current includes a first jaw secured to a fixed support and a second jaw pivotally mounted on the fixed support, and pivotable between a position closing the clamp and an open position, and an elastic element for returning the movable jaw to the closed position. The clamp includes a device scaling down the force required for opening the clamp, by application of the force to a trigger. The device is mounted between the elastic return element and the trigger, upon opening the clamp.

Abstract: An earth clamp for testing contact voltage, comprising a measuring circuit formed of a voltage inducing transformer and a current measuring transformer, adapted to be mutually coupled by an earth conductor whose earth impedance is to be measured, a microcontroller to deliver an alternating voltage to the voltage inducing transformer and, in response, to receive a reference voltage generated in the earth conductor and an earth current iB+iF induced in the current measuring transformer, the microcontroller being configured to extract an amplitude E of the reference voltage, an amplitude IB and an amplitude IF of the earth current and a phase shift ? between the reference voltage and the loop current iB and to calculate the earth impedance Zb at a determined frequency, the microcontroller also computing the contact voltage Uc at said determined frequency by the product of the earth impedance times the amplitude IF.