Abstract: An excitation circuit includes a first operational amplifier that supplies a first excitation current to a first coil constituting a first flux gate, and a second operational amplifier that supplies a second excitation current to a second coil constituting a second flux gate. The excitation circuit further includes a signal generation circuit that generates input signals for the first operational amplifier and the second operational amplifier. The signal generation circuit includes a third operational amplifier that generates an inverted voltage or a non-inverted voltage based on an AC excitation voltage for exciting the pair of flux gates as an input signal for the first operational amplifier, and a fourth operational amplifier that generates an inverted voltage or a non-inverted voltage based on the AC excitation voltage as an input signal for the second operational amplifier.

Abstract: A differential amplifier circuit includes a basic differential amplifier circuit including an operational amplifier configured to amplify a potential difference between output ends of a first input resistor and a second input resistor, a feedback resistor connected to the output end of the first input resistor, and a first resistance element connected to the output end of the second input resistor. Furthermore, the differential amplifier circuit includes a high-precision operational amplifier having an offset voltage or a drift voltage lower than that of the operational amplifier. The high-precision operational amplifier includes an inverting input terminal connected to the output end of the first input resistor and an output terminal connected to the output end of the second input resistor.

Abstract: A measuring device measures a state of a plurality of weld zones formed when a weldment is welded to a workpiece at a plurality of locations. This measuring device includes a plurality of application circuits that apply a current to each of one or more weld zones exclusively selected among the plurality of weld zones, and a detection circuit that detects a voltage obtained by combining voltages indicating magnitudes of voltage drops generated respectively by the plurality of more weld zones due to the application of the current. The measuring device further includes a processor that outputs information indicating the state of the plurality of weld zones on the basis of the voltages detected by the detection circuit.

Abstract: A resistance measurement device includes a connection structure including a set of first contact portions in contact with a first member and a second member, respectively, and a set of second contact portions in contact with different portions of the second member. The resistance measurement device includes a storage unit configured to store information indicating a relation between a resistance value between the set of second contact portions and a temperature of a joint portion. The resistance measurement device includes a measurement control unit configured to form a state where a first resistance value between the set of first contact portions is measured by a measurement unit and a state where a second resistance value between the set of second contact portions is measured by the measurement unit.

Abstract: A signal injection unit configured to inject an AC signal to an target injection line to which a battery is connected in series, a non-contact-type current sensor that detects a current value of the AC signal flowing through the target injection line in a non-contact manner with respect to the target injection line and outputs a detection signal, a voltage detection unit that detects a voltage value of an AC voltage generated at ends of the battery by being in contact with the ends and outputs an end-to-end voltage signal, and a processing unit that measures an internal impedance of the battery on the basis of the detection signal and the end-to-end voltage signal. The signal injection unit is configured to inject the AC signal to the target injection line in a non-contact manner.

Abstract: Changes over time in a measured impedance are displayed in an easy to identify manner. A measurement result display apparatus includes a processor that executes a measurement result display process that displays measurement results on a display 5 based on measurement result data produced by encoding impedances that have been measured by a measurement apparatus. During the measurement result display process, the processor displays, on the display 5 and based on a plurality of measurement result data of impedances that satisfy a predetermined comparison condition and were produced by the measurement apparatus at different measurement times, a measurement result display screen 20 with measurement result displays 21a to 21d (graphs) in which the impedances for respective measurement result data are aligned in order of measurement time.

Abstract: A short circuit detection device for detecting a short circuit occurring in a detection target measures an electrostatic capacitance value of the detection target and determines, on the basis of the measured electrostatic capacitance value, a current value of a current to be supplied to the detection target. Furthermore, the short circuit detection device supplies the current having the determined current value to the detection target and detects a short circuit in the detection target while the current is being supplied to the detection target.

Abstract: A current measurement component including a bridging portion bridging a pair of side surface portions, a pair of coaxial components attached to the pair of side surface portions, respectively, each coaxial pair including an inner conductor that extends through a hole formed in a corresponding side surface portion of the pair of side surface portions, a connection portion electrically connecting the inner conductors of the pair of coaxial components, and a tube-like portion enclosing the connection portion with a gap formed between the tube-like portion and an outer peripheral portion of the connection portion. The pair of side surface portions and the bridging portion are electrically conductive and electrically connected, and the tube-like portion includes a base end portion electrically connected to a first side surface portion of the pair of side surface portions and a distal end portion electrically separated from the outer conductor of coaxial component pairs.

Abstract: An amplifier circuit includes an operational amplifier to amplify an input signal input to a non-inverting input terminal, first and second feedback units to feed back an output signal output from the operational amplifier to an inverting input terminal of the operational amplifier, and a coupling unit to AC couple the second feedback unit and the inverting input terminal. The first feedback unit is to, together with the coupling unit, as a frequency of the output signal of the operational amplifier is increased, reduce an electric potential to be applied to the inverting input terminal with respect to the output signal. At the same time, the second feedback unit is to generate a predetermined electric potential lower than an electric potential of the output signal, the second feedback unit being configured to apply a predetermined electric potential to the inverting input terminal via the coupling unit.

Abstract: A measurement device configured to measure a state of a target device that is capable of switching at least one transmission direction of a channel among transmission directions of electric power transmitted through a plurality of channels. The measurement device retains information indicating whether a reference transmission direction of the electric power transmitted to each of the channels is an input direction in which the electric power is input to the target device or an output direction in which the electric power is output from the target device, acquires a signal indicating a direction and intensity of the electric power, and computes at least one of an input electric power and an output electric power of the target device on the basis of the sign indicating the direction of the above-described signal with respect to the reference transmission direction of the electric power of each of the channels.

Abstract: Changes over time in a measured impedance are displayed in an easy to identify manner. A measurement result display apparatus includes a processor that executes a measurement result display process that displays measurement results on a display 5 based on measurement result data produced by encoding impedances that have been measured by a measurement apparatus. During the measurement result display process, the processor displays, on the display 5 and based on a plurality of measurement result data of impedances that satisfy a predetermined comparison condition and were produced by the measurement apparatus at different measurement times, a measurement result display screen 20 with measurement result displays 21a to 21d (graphs) in which the impedances for respective measurement result data are aligned in order of measurement time.

Abstract: Provided is a measurement system in which a measurement instrument and a terminal are configured so as to be communicatable. The measurement instrument is provided with: a measurement unit configured to execute measurement processing for measuring a physical quantity of a measurement target; a detection unit configured to detect execution of the measurement processing; and a transmission permission unit configured to permit transmission of a measurement result to the terminal, the permission being triggered by detection of the execution of the measurement processing by the detection unit. The terminal is provided with: a result reception unit configured to receive the measurement result from the measurement instrument; and an execution unit configured to execute a predetermined processing based on the measurement result received.

Abstract: The characteristics of a winding to be tested is allowed to be analyzed more easily and in a shorter time. A testing instrument 1 includes an impulse voltage application capacitor Cs having one end connected to an external terminal T2, a switch SW and a current limiting resistor Rs connected in series between another end of the impulse voltage application capacitor Cs and an external terminal T1, and a parameter calculator 5. The parameter calculator 5 calculates at least one of the value of the equivalent capacitor Cd, the value of the equivalent inductor Ld and the value of the equivalent resistor Rd by performing regression analysis using a measured value of a voltage Vcd in an analysis time period Ta from turning on of the switch SW to start of resonance based on the equivalent inductor Ld, the equivalent capacitor Cd and the equivalent resistor Rd pertaining to a winding 11.

Abstract: A current sensor includes an excitation detection winding configured such that an excitation signal for exciting a second magnetic core is input, the excitation detection winding detects magnetic flux flowing through the second magnetic core and outputs a detection signal indicating a measurement-target current. The current sensor includes an auxiliary winding that detects the magnetic flux and outputs an auxiliary signal indicating the measurement-target current. The current sensor includes a feedback winding wound around first and second magnetic cores, the feedback winding being configured such that a signal generated from the detection signal is input, and the feedback winding being wound to cancel out magnetic flux of the first and second magnetic cores. The current sensor includes a circuit to output an output signal indicating a level of the measurement-target current by modifying a signal output from the feedback winding based on a correction signal generated from the auxiliary signal.

Abstract: The probe apparatus has a probe (first metal plate) as a signal terminal and a probe (second metal plate) as a ground terminal. A probe holder has a holder main body formed of a conductor, clamps that are formed of a dielectric and capable of clamping the probes, and a fixing member and a male screw (or “fixture”) capable of fixing both clamps, which have clamped the probes, to the holder main body. The probes are clamped by the two clamps in a state where the probes have been aligned along the plate surface direction, parts at front-end portion sides of the probes protrude from the two clamps, and the parts at front-end portion sides are capable of elastic deformation along the plate thickness direction.

Abstract: A measurement apparatus of a power storage device supplies constant current to the power storage device, measures voltage of the power storage device, and computes an internal state of the power storage device on the basis of voltage change in the power storage device subjected to the measurement.

Abstract: An amplifier circuit includes an operational amplifier to amplify an input signal input to a non-inverting input terminal, first and second feedback units to feed back an output signal output from the operational amplifier to an inverting input terminal of the operational amplifier, and a coupling unit to AC couple the second feedback unit and the inverting input terminal. The first feedback unit is to, together with the coupling unit, as a frequency of the output signal of the operational amplifier is increased, reduce an electric potential to be applied to the inverting input terminal with respect to the output signal. At the same time, the second feedback unit is to generate a predetermined electric potential lower than an electric potential of the output signal, the second feedback unit being configured to apply a predetermined electric potential to the inverting input terminal via the coupling unit.

Abstract: A state determination apparatus includes: electrodes configured to apply AC signal to a mixture; a measurement unit configured to measure an impedance of the mixture for every frequency of the AC signal based on a response signal flowing through the mixture when the AC signal is applied; a setting unit configured to set an equivalent circuit including one or a plurality of parallel circuit(s) based on element(s) corresponding to electrical component(s) of a solid matter; a calculating unit configured to calculate a parameter of the parallel circuit by executing an equivalent circuit analysis for approximating impedance of the equivalent circuit to the impedance of the mixture; and a derivation unit configured to derive an index for specifying a state of the mixture based on the parameter of the parallel circuit.

Abstract: A measuring apparatus includes: N pairs of probes that are respectively connected to a positive electrode and an external member of N rechargeable batteries that have a capacitance connected in parallel between the positive electrode and the external member; a scanner that selectively switches to one pair of probes out of the N pairs; a measuring apparatus that measures the voltage between the selected probes; and a controller. A plurality of resistance configurations to be connected between each pair of probes are provided. After a standby time has elapsed in a state where the N pairs of probes are connected to the positive electrodes and external members of the N rechargeable batteries, the controller outputs control signals to the scanner to successively switch to each pair of probes and causes the measuring apparatus to measure the voltage between the selected probes every time switching is performed.

Abstract: A uniformity output device for outputting a uniformity of particles in a slurry, in which an insoluble solid matter is mixed in liquid, includes: a pair of electrodes configured to apply AC voltage to the slurry; a measurement unit configured to measure impedance of the slurry on the basis of the response current flowing through the slurry when AC voltage with changing frequency is applied to the slurry; and a processing unit configured to determine the uniformity by executing a particle equivalent circuit analysis with a parallel circuit formed of a resistor and a capacitor as an element on the basis of the impedance measured by the measurement unit in accordance with the frequency.