An electrical measurement apparatus may include a bias voltage generator configured to generate and output a bias voltage, a bias probe coupled to the output of bias voltage generator configured to apply voltage bias to a first portion of an external circuit which may be subjected to environmental stresses such as vibration, temperature, humidity etc., a measurement probe configured to receive a second electrical signal from a second portion of the external circuit, and a control unit configured to control the bias voltage generator to generate different bias voltages, patterns, AC/DC etc., receive the second electrical signal from the measurement probe and cause the device to output a response in the second electrical signal to the time-domain discontinuity in the first electrical signal.

An electrical measurement apparatus may include a bias voltage generator configured to generate and output a bias voltage, a bias probe coupled to the output of bias voltage generator configured to apply voltage bias to a first portion of an external circuit which may be subjected to environmental stresses such as vibration, temperature, humidity etc., a measurement probe configured to receive a second electrical signal from a second portion of the external circuit, and a control unit configured to control the bias voltage generator to generate different bias voltages, patterns, AC/DC etc., receive the second electrical signal from the measurement probe and cause the device to output a response in the second electrical signal to the time-domain discontinuity in the first electrical signal.

Herein disclosed is a voltage isolation circuit coupled to power supplies. The voltage isolation circuit comprises a series switch group controlled by a first control signal, a parallel switch group controlled by a second control signal, and a first high impedance element. The series switch group comprises a transistor arranged in a first current loop and having two channels connected to one of the power supplies respectively. The first high impedance element, coupled to the transistor in parallel, has a measurement terminal and two ends, connected to one of the power supplies respectively. When the series switch group is conducted, the power supplies are coupled in series in the first current loop. When the parallel switch group is conducted, the power supplies are coupled in parallel in a second current loop. Impedance values measured from the measurement terminal to each end of the first high impedance element are identical.

A field device I/O connector includes a base and an I/O module removably mounted on the base for transmitting I/O signals along an I/O channel. A set of electrical connectors mounted on the base connect the base to a field device. The electrical connectors, the base, and the I/O module mounted on the base cooperate to define the I/O channel. The I/O channel includes a conversion circuit to convert between I/O signals and a digital data format output from the field device I/O connector. The base and I/O module also cooperate to define a diagnostic circuit connected to the portion of the I/O channel extending through the I/O module. The diagnostic circuit extends to a diagnostic logic circuit that may be included on the base, in the I/O module, or away from the field device I/O connector.

In one embodiment, there is a test switch signal analyzer comprising: an analyzer hub operably couplable to a test switch base that includes a plurality of test switch conductors; at least one signal probe operatively couplable to the analyzer hub and to at least one of the plurality of test switch conductors when the analyzer hub is coupled to the test switch base, each of the at least one signal probes being configured to receive electrical signals from one of the plurality of test switch conductors and to generate one or more probe signals that corresponds to the received electrical signals; a signal processing unit coupled to the analyzer hub and configured to receive the one or more probe signals from the at least one signal probe, the signal processing unit configured to determine a plurality of electrical signal values based on the probe signals received from the at least one signal probe; the signal processing unit, the analyzer hub, and at least a portion of the at least one signal probe being positionable within a test switch cover configured and dimensioned to mate with the test switch base when the at least one signal probe is coupled to the at least one of the plurality of test switch conductors and the test switch cover is secured to the test switch base.

A sensor arrangement includes at least one sensor which is connected to a first control unit and a second control unit. The at least one sensor has two sensor connections, and each of the sensor connections of the at least one sensor is electrically connected to an assigned node. Each node is respectively connected downstream of a control unit input of the first control unit and respectively connected upstream of a control unit input of the second control unit.

A power meter includes a plurality of terminals for receiving a measure of power consumption of each of one or more phases of power that is delivered to a load and a controller that is operatively coupled to the plurality of terminals. The controller is configured to determine a number of power monitor parameters based on the measure of power consumption of each of one or more phases of power that is delivered to the load. The controller is further configured to operate an interactive menu. The power meter includes a user interface that is configured to display the number of power monitor parameters based on the measure of power consumption of each of one or more phases of power that is delivered to the load and to enable a user to navigate the interactive menu using via one or more screens displayed on the user interface.

An apparatus and method for detecting transient voltage at an electrical component of a circuit board is provided. The apparatus including a circuit including a comparator and a latch, wherein a first input of the comparator is electrically coupled to the electrical component, and the comparator receives a threshold voltage at a second input, where the comparator outputs either a high signal or a low signal in response to both the first input and the second input, and an output of the comparator is electrically coupled to an input of the latch such that the latch outputs a high signal in response to receiving a high signal from the comparator, and an indicator electrically coupled to an output of the latch, and where the apparatus is mounted non-permanently to the circuit board to provide a non-permanent electrical coupling between the comparator and the electrical component.

A power monitoring system includes a current transformer and a power meter. The current transformer includes a winding for sensing a measure of current in a conductor that supplies power to a load and a machine-readable apparatus that is secured relative to the current transformer and that encodes calibration information that is specific to the current transformer. The power meter includes a first input for receiving the measure of current and a second input for receiving a measure of voltage. A controller configured to receive the calibration information encoded in the machine-readable apparatus, calibrate the controller with the current transformer based on the calibration information and determine a number of power monitor parameters based at least in part on the calibration information, the measure of current sensed in the conductor by the current transformer and the measure of voltage of the conductor.

The present invention discloses an external battery short-circuit testing device, configured to perform short-circuit test on a battery pack under test. The external battery short-circuit testing device comprises a plurality of fuses; a Hall current transducer, coupled to the plurality of fuses; a current meter, coupled to the Hall current transducer and the battery pack under test; a voltmeter, coupled to the battery pack under test; a variable resistor, coupled to the Hall current transducer; an electromagnetic switch, coupled to the variable resistor and the battery pack under test; and an operation unit, comprising a voltage measurement unit, a current measurement unit, a temperature measurement unit and a switch control unit.