Systems, devices, and operating methods thereof provide for operation of a display based on detection of defined electrical conditions. Measurement devices may include a housing sized and shaped to be held in a hand, a set of sensor devices for sensing a set of electrical characteristics, processing circuitry, and a display supported by the housing. The measurement devices receive measurements obtained from the sensor devices and determine whether the measurements satisfy criteria for detecting defined electrical conditions in an element under test. Operating modes of the display having different corresponding illumination characteristics are controlled as a result of determining the presence of defined electrical conditions in the element under test.

A leakage current protection system includes a current transformer disposed about current-carrying conductors that extend from first ends to second ends. The first ends are coupled to load receptacles. The current transformer detects an aggregate differential current between the conductors. Each of a plurality of circuit breakers is coupled to the second ends of the conductors that are coupled to a corresponding one of the load receptacles. Each circuit breaker is coupled to a source of electrical power. A differential current monitor coupled to the current transformer generates a signal when the aggregate differential current exceeds a threshold current. Each of a plurality of shunt-trips coupled to the differential current monitor receives the signal. Each of the shunt-trips opens a corresponding one of the circuit breakers when the signal is received so that all of the circuit breakers are opened simultaneously.

A leakage current protection system includes a current transformer disposed about current-carrying conductors that extend from first ends to second ends. The first ends are coupled to load receptacles. The current transformer detects an aggregate differential current between the conductors. Each of a plurality of circuit breakers is coupled to the second ends of the conductors that are coupled to a corresponding one of the load receptacles. Each circuit breaker is coupled to a source of electrical power. A differential current monitor coupled to the current transformer generates a signal when the aggregate differential current exceeds a threshold current. Each of a plurality of shunt-trips coupled to the differential current monitor receives the signal. Each of the shunt-trips opens a corresponding one of the circuit breakers when the signal is received so that all of the circuit breakers are opened simultaneously.

The invention involves a multimeter with a meter probe module and phasing probe module capable of wireless communication, proximity measurements, and accurately reading phase degrees. The meter probe module and the phasing probe module can communicate wirelessly, via a wired cable interface, or any combination thereof. The meter probe module and phasing probe module have unique radio frequency serial numbers that allow the probe modules to only communicate with its paired partner probe module while ignoring all other probe modules. The multimeter has a measurement point capable of taking direct contact measurements. The multimeter also has a measurement point capable of taking a voltage measurement without directly contacting the object to be measured. This is accomplished by taking voltage readings from the electric field of the air surrounding said object. The improved multimeter may allow an operator to more safely gather accurate information about an object being measured.

A Rogowski coil in a sensor unit has voltage induced by a conductor surrounded by the Rogowski coil. The voltage is integrated to represent current which is converted to digital data representing current in the conductor and sent wirelessly to a multimeter. The sensor unit may receive control signals from the multimeter and a remote control apparatus. A plurality of sensor units may be networked and controlled by the remote control apparatus.

A Rogowski coil in a sensor unit has voltage induced by a conductor surrounded by the Rogowski coil. The voltage is integrated to represent current which is converted to digital data representing current in the conductor and sent wirelessly to a multimeter. The sensor unit may receive control signals from the multimeter and a remote control apparatus. A plurality of sensor units may be networked and controlled by the remote control apparatus.

An apparatus includes a tablet computing device and a radio module physically fastened to the tablet computing device. The tablet computing device has a display and is configured to establish WiFi and BLUETOOTH Low Energy (BLE) communication links with other devices. The radio module is configured to establish ISA100 and WirelessHART communication links with field devices of a process control and automation system. The tablet computing device and the radio module are configured to communicate with each other using a BLE communication link. The apparatus is configured to selectably operate in multiple modes comprising a gateway mode, a router mode, a sniffer mode, and a discovery mode.

The present invention relates to a measurement or inspection apparatus which can be adjusted depending on a color of a plugged-in cable. In this manner the display of measurement values and the colour of the plugged-in cable can be coordinated to each other such that a simple assignment between measurement values and cable can be performed.

A non-contact voltage and ground detector allows a user to easily analyze the ground or neutral port of an electrical component. The detector includes a tubular body, a metal probe, a power source, a ground-and-neutral detector mechanism, and a non-contact voltage device. The metal probe is concentrically and terminally mounted to the tubular body and acts as the physical engaging element. The power source provides the electrical energy for the detector and is mounted within the tubular body. The ground-and-neutral detector mechanism in conjunction with the metal probe set up an open circuit. The ground-and-neutral detector registers the quality of a ground or neutral when the metal probe with an external electrical element. The non-contact voltage device measures changes in magnetic fields about an electrical component to identify the presence of voltage within the electrical component.

A non-contact voltage and ground detector allows a user to easily analyze the ground or neutral port of an electrical component. The detector includes a tubular body, a metal probe, a power source, a ground-and-neutral detector mechanism, and a non-contact voltage device. The metal probe is concentrically and terminally mounted to the tubular body and acts as the physical engaging element. The power source provides the electrical energy for the detector and is mounted within the tubular body. The ground-and-neutral detector mechanism in conjunction with the metal probe set up an open circuit. The ground-and-neutral detector registers the quality of a ground or neutral when the metal probe with an external electrical element. The non-contact voltage device measures changes in magnetic fields about an electrical component to identify the presence of voltage within the electrical component.