A low voltage system and method for servicing welding equipment including a service tool that may provide a low voltage power source to the welding equipment, enabling the welding equipment to be tested in a low voltage mode of operation. The service tool may also run various test sequences on the welding equipment operating in a low voltage mode of operation to troubleshoot and diagnose any issues with the circuitry of the welding equipment.

An electricity meter includes a front circuit connected to an external transformer and a conductor connected to the external transformer via the front circuit; a test circuit including a test generation chain and a test measuring chain connected to the conductor and a processing component; the test generation chain being arranged to apply a test voltage on the conductor, which produces a test current circulating in the test measuring chain, the test voltage having a level which depends on the impedance of the external transformer, the processing component being arranged to detect a cutoff of the external transformer when the level of the test voltage is greater than a predefined detection threshold.

A testing device including a main housing, and a probe housing, wherein the probe housing is rotatably coupled to the main housing. The testing device further includes a first test probe and a second test probe. The first test probe may be configured to be inserted into an alternating-current receptacle. The second test probe is coupled to the probe housing. The second test probe may be configured to be inserted into a universal serial bus receptacle.

A testing device including a main housing, and a probe housing, wherein the probe housing is rotatably coupled to the main housing. The testing device further includes a first test probe and a second test probe. The first test probe may be configured to be inserted into an alternating-current receptacle. The second test probe is coupled to the probe housing. The second test probe may be configured to be inserted into a universal serial bus receptacle.

A method for performing predictive maintenance of an amplifier module is described. At least one parameter of at least one amplifier module is acquired via a measurement data acquisition unit. The at least one parameter acquired is analyzed via a measurement data analyzing unit so as to predict the probability and/or time of default of the at least one amplifier module. Further, a system is described.

A method for performing predictive maintenance of an amplifier module is described. At least one parameter of at least one amplifier module is acquired via a measurement data acquisition unit. The at least one parameter acquired is analyzed via a measurement data analyzing unit so as to predict the probability and/or time of default of the at least one amplifier module. Further, a system is described.

Methods, systems, and apparatus, including computer programs stored on a computer-readable storage medium, for obtaining, from an electric field sensor, measurements of a net electric field resulting from a combination of respective electric fields from two or more electrical power conductors that are proximate to the electric field sensor. The apparatus detects a change in successive measurements of the net electric field. The apparatus determines, based on the change, that an electrical fault has occurred in one of the two or more electric power conductors. The apparatus sends to a server system, data indicating that the electrical fault has occurred in one of the two or more electric power conductors.

Methods, systems, and apparatus, including computer programs stored on a computer-readable storage medium, for obtaining, from an electric field sensor, measurements of a net electric field resulting from a combination of respective electric fields from two or more electrical power conductors that are proximate to the electric field sensor. The apparatus detects a change in successive measurements of the net electric field. The apparatus determines, based on the change, that an electrical fault has occurred in one of the two or more electric power conductors. The apparatus sends to a server system, data indicating that the electrical fault has occurred in one of the two or more electric power conductors.

Systems and methods for direct heater diagnostics for a hot melt liquid dispensing system are disclosed. At least one of a current measurement or a voltage measurement is received from a respective current and/or voltage sensor positioned at an electrical circuit that supplies electric power to a heater associated with the dispensing system. The heater can be for an applicator or heated hose attached to the dispensing system, a melter of the dispensing system, or a pump of the dispensing system. A state of the electrical circuit is determined based on the at least one of the current or voltage measurement.

Various aspects of the disclosure relate to evaluating the electromagnetic impedance characteristics of a material under test (MUT) over a range of frequencies. In particular aspects, a system includes: an electrically non-conducting container sized to hold the MUT, the electrically non-conducting container having a first opening at a first end thereof and a second opening at a second, opposite end thereof; a transmitting electrode assembly at the first end of the electrically non-conducting container, the transmitting electrode assembly having a transmitting electrode with a transmitting surface; and a receiving electrode assembly at the second end of the electrically non-conducting container, the receiving electrode assembly having a receiving electrode with a receiving surface, wherein the receiving electrode is approximately parallel with the transmitting electrode, and wherein the transmitting surface of the transmitting electrode is larger than the receiving surface of the receiving electrode.