In the modern world, electricity has become ubiquitous. Electrical connectors that connect and disconnect the electricity from the end use device have become important. If the connector has established a good quality contact across its mating conductors, there is no cause for concern. Also, if the connector has not established any contact with associated contacts being far away, then also there is no cause for a safety concern. However, when a connector has established marginal contact between the source and drain side contacts, and if the load and the source are switched on, the possibility of an arc across the thin layer of oxide separating the two contacts is high. This invention teaches a method to measure the quality of electrical connection established across an electrical connector. The method described here can be used to ascertain the quality of the connection before turning on the current across the connection.

An apparatus and method for selecting a ground capacitor that is connected between a ground of a circuit board included in a battery pack and a vehicle chassis. The apparatus includes a checking module configured to check a ground location on the circuit board; a selecting module configured to select a reference location on the circuit board, based on the ground location checked by the checking module; a calculating module configured to calculate a distance from the reference location selected by the selecting module to a nearest ground location as a reference distance; a computing module configured to compute a reference frequency by using the reference distance calculated by the calculating module; and a choosing module configured to choose a recommended capacitor, based on the reference frequency computed by the computing module.

The invention relates to a method of measuring earth ground resistance. The method comprises the steps of: Performing an earth ground resistance measurement by means of an earth ground measurement device, thereby obtaining measurement data, Gathering the measurement data via at least two different channels of the earth ground measurement device such that multiple measurements are performed at once, wherein each channel is configured to perform an earth ground resistance measurement, and Uploading the measurement data automatically to a remote processing module separately formed with respect to the earth ground measurement device.

Further, a system for measuring earth ground resistance is described.

The invention relates to a method of measuring earth ground resistance. The method comprises the steps of: Performing an earth ground resistance measurement by means of an earth ground measurement device, thereby obtaining measurement data, Gathering the measurement data via at least two different channels of the earth ground measurement device such that multiple measurements are performed at once, wherein each channel is configured to perform an earth ground resistance measurement, and Uploading the measurement data automatically to a remote processing module separately formed with respect to the earth ground measurement device.

Further, a system for measuring earth ground resistance is described.

A converter system includes a plurality of converters, a sampling circuit, and a control circuit. The plurality of converters are connected in parallel. Each converter includes a detection circuit which includes a first switch and at least two resistors. The first switch is connected in parallel with one of the at least two resistors. The control circuit control the sampling circuit to collect a first voltage and a second voltage, where the first voltage is a voltage that is between a second bus and a ground cable and that is collected by the sampling circuit when first switches in detection circuits of a first quantity are in a turn-on state, the second voltage is a voltage that is between the second bus and the ground cable and that is collected by the sampling circuit when first switches in detection circuits of a second quantity are in a turn-on state.

The present disclosure provides a method for characterizing ohmic contact electrode performance of a semiconductor device. The method comprises: preparing two sets of testing patterns on a semiconductor device; testing resistance values of the two sets of testing patterns respectively; calculating a sheet resistance of an ohmic contact area according to the obtained resistance values; and evaluating the ohmic contact electrode performance of the semiconductor device according to the sheet resistance of the ohmic contact electrode.

Provided is a method and device for obtaining internal side and external side insulation resistances of a relay. The method comprises steps of: controlling the insulation resistance obtaining circuit to output a low-frequency AC signal; when both the main relay and the pre-charge relay are switched off, obtaining an internal side insulation resistance of the main relay according to the low-frequency AC signal; if the internal side insulation resistance of the main relay is normal, controlling the pre-charge relay to be switched on; and when the main relay is switched off and the pre-charge relay is switched on, obtaining an external side insulation resistance value of the main relay according to the low-frequency AC signal. Therefore, the present disclosure can obtain the internal side and external side insulation conditions of the main relay.

An electrical discharge testing system for detecting electrical discharge rate failure in an electrical-based tire defect tester. The electrical discharge testing system generally includes a probe which is connected to a power source such that the probe periodically discharges electricity for the purpose of testing a tire for defects. A sensor detects each electrical discharge of the probe. To ensure that the probe is discharging at an appropriate rate for efficient coverage of the tire, a timer is preset to a threshold period of time between electrical discharges. The timer is reset each time an electrical discharge from the probe is detected by the sensor. If the timer reaches zero before a subsequent electrical discharge after a reset, an indicator is activated to indicate a fault in the tire defect tester.

A ground electrode (100) positioned in the earth and a monitoring device (200) configured to measure a current and resistance of a ground line, where the monitoring device (200) includes a ground current sensing unit (210) configured to measure the current of the ground line, a resistance sensing unit (220) configured to measure ground resistance of the earth and an earth resistance rate, a voltage sensing unit (230) configured to check a voltage value of commercial power, a temperature and humidity sensing unit (240) configured to check a surrounding temperature and humidity of the monitoring device (200), and a monitoring unit (250) configured to confirm whether the ground current, ground resistance and earth resistance measured are abnormal values by compared with reference values classified based on the temperature and humidity measured.

A ground electrode (100) positioned in the earth and a monitoring device (200) configured to measure a current and resistance of a ground line, where the monitoring device (200) includes a ground current sensing unit (210) configured to measure the current of the ground line, a resistance sensing unit (220) configured to measure ground resistance of the earth and an earth resistance rate, a voltage sensing unit (230) configured to check a voltage value of commercial power, a temperature and humidity sensing unit (240) configured to check a surrounding temperature and humidity of the monitoring device (200), and a monitoring unit (250) configured to confirm whether the ground current, ground resistance and earth resistance measured are abnormal values by compared with reference values classified based on the temperature and humidity measured.