A resistor arrangement for measuring current strength having connection elements and a resistor element between the connection elements. The connection elements and the resistor element are arranged in a plane and in a row such that the arrangement is strip-shaped and has its smallest spatial extent perpendicular to the current direction. The resistor element has two contact sides and the connection elements each have a contact face connected to the contact sides. When current flows through the arrangement, current flow lines are formed which are deflected at at least one of the contact sides by an angle of at least 5° at the transition from the connection element to the resistor element.

Devices, systems, and methods for measurement of parameters of electric power transmission lines can improve electric power usage, while wireless circuitry can provide communication from field-located devices. Connection to draw electrical power from the transmission line can be distinct from connection to sense line parameters.

Devices, systems, and methods for measurement of parameters of electric power transmission lines can improve electric power usage, while wireless circuitry can provide communication from field-located devices. Connection to draw electrical power from the transmission line can be distinct from connection to sense line parameters.

A power switch current sensing circuit includes matching first and second transistors having sources connected to first and second terminals, respectively, of the power switch. A current mirror has a first node coupled to a drain of the first transistor and a second node coupled to a drain of the second transistor. The current mirror sinks a current from the first node equal to a current flowing through the second transistor. A biasing circuit provides a same biasing voltage to the control terminals of the first and second transistors. An output resistance is coupled between the first node and a reference voltage node. A difference between a current flowing through the first transistor and the current sunk by the current mirror circuit from the first node flows through the output resistance. An output voltage produced at the first node is indicative of the current flowing through the power switch.

A three-phase load is powered by a PWM (e.g., SVPWM) driven DC-AC inverter having a single shunt-topology. A shunt voltage and a branch voltage of the inverter (across a transistor to be calibrated) are measured during a second period of each SVPWM sector, and the drain-to-source resistance of the calibrated transistor is calculated. During the fourth period of each SVPWM sector, the branch voltage is measured again, and another branch voltage across another transistor is measured. Using the drain-to-source resistance of the calibrated transistor and the voltage across the calibrated transistor measured during the fourth period, the phase current through the calibrated transistor is calculated. Using the other branch voltage measured during the fourth period and the drain-to-source resistance of its corresponding transistor (known from a prior SVPWM sector), the phase current through that transistor is calculated. From the two calculated phase currents, the other phase current can be calculated.

An example test system includes a test head, and a device interface board (DIB) configured to connect to the test head. The DIB is for holding devices under test (DUTs). The DIB includes electrical conductors for transmitting electrical signals between the DUTs and the test head. Servers are programmed to function as test instruments. The servers are external to, and remote from, the test head and are configured to communicate signals over fiber optic cables with the test head. The signals include serial signals.

An arrangement for determining a magnitude of an electrical current flowing through a busbar. The arrangement has a measurement conductor which is electrically connected at a first contact point to the busbar and which extends from the first contact point to a second contact point. A third contact point is located on the busbar at a spacing distance from the first contact point. A voltage measurement device is configured to measure a voltage between the second contact point and the third contact point. The arrangement also has a controlled current source which is configured to introduce a measurement current into the measurement conductor.

A radiation hardened current sensor to sense direct current (DC), low frequency alternating current (AC), and high frequency AC includes a DC current transformer (DCCT) including a primary DCCT winding and a secondary DCCT winding. A self-oscillating modulator is coupled to the secondary DCCT winding of the DCCT to maintain a magnetic flux density of the DCCT at an upper limit and a lower limit of a magnetic hysteresis characteristic of the DCCT. An active filter passes only the DC and the low frequency AC from the DCCT as an output. An AC current transformer (ACCT) including a primary ACCT winding and a secondary ACCT winding. The output of the active filter is coupled to the ACCT and the secondary ACCT winding provides the high frequency AC.

A current detection device (30) includes a resistance element (5), and a pair of electrodes (6, 7). The current detection device (30) has a projecting portion (11). The projecting portion (11) has a portion of the resistance element (5) and portions of the pair of electrodes (6, 7). The electrodes (6, 7) have first wall portions (66b, 67b) forming a portion of the projecting portion (11), and second wall portions (66a, 67a) forming the portion of the projecting portion (11). The electrodes (6, 7) have detection areas (66, 67) demarcated by the first wall portion (66b, 67b), the second wall portion (66a, 67a), a leading end portion (66c, 67c), and a contact surface (6a, 7a). The electrodes (6, 7) have voltage detecting portions (20, 21). The voltage detecting portions (20, 21) are arranged in the detection areas (66, 67) with a gap between the leading end portions (66c, 67c).

A holding device, includes: a holding portion configured to hold a shunt resistor; a spacer portion extending from the holding portion and abutting on a front surface of a substrate on which a monitoring unit configured to monitor a current value of a current flowing through the shunt resistor is mounted; and an engaging portion extending from the holding portion and having an engaging claw to be engaged with a back surface of the substrate. The spacer portion separates the holding portion and the substrate from each other such that a connection portion which electrically connects the shunt resistor and the monitoring unit is visible.