A charge and discharge testing device capable of evaluating highly accurate charge and discharge characteristics for a high output type or a low output type secondary battery is provided. The present invention includes a bridge circuit including first and second switch elements connected in tandem at a first connection point, and third and fourth switch elements connected in tandem at a second connection point, and a control unit which when a mode signal indicates a first mode, controls the first to fourth switch elements so that the first and fourth switch elements and the second and third switch elements are alternately turned on and off, and when the mode signal indicates a second mode, controls the third switch element to be an off state and the fourth switch element to be an on state, and applies analog output control to vertically change a current made to flow due to an analog voltage in which a voltage greater than or equal to a gate threshold voltage changes up and down, to the first switch element during charge control and the second switch element in charging.

A display panel is provided. The display panel includes a cell test structure. The cell test structure is positioned at a frame of the display panel. The cell test structure includes cell test portions for supplying electric power to the cell test structure, and multiple connection lines for connecting conductive lines of a display region of the display panel. The cell test structure also includes a first shorting bar disposed and connected between the cell test portions and the connection lines. The cell test structure further includes multiple active switches disposed on the connection lines. The active switches are electrically connected to the cell test portions.

A signal control system is configured to perform diagnostic testing on an electrical system. The signal control system includes a first control switch electrically coupled to a second control switch. A first multimeter lead terminal and a second multimeter lead terminal are electrically coupled to the first control switch and the second control switch. A battery is electrically coupled to the first control switch and the second control switch. A control system is electrically coupled to the first control switch, the second control switch, the first multimeter lead terminal, the second multimeter lead terminal, and the battery and configured to perform the diagnostic testing on the electrical system.

A connector assembly for a portable field device testing includes a two-wire communication line to provide communication between a handheld maintenance tool and a field device, a first two-prong plug to provide power and communication signals to the field device and a shunt plug to provide power to the field device using the two-wire communication line.

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.

An electrical circuit for a mobile machine, including an interface coupled between a controller and a plurality of sensors for accurately diagnosing faults in all of the sensor wires and the sensors themselves. This effective resolution reduces the downtime of the mobile machine and operator time by allowing faults to be timely isolated. The interface selectively couples a test signal to each of the sensor conductors, and also selectively couples a responsive returned characteristic signal to the controller, where the returned characteristic signal enables the controller to diagnose each of the plurality of conductors and sensors for faults. The electrical circuit may further include testing circuitry that can specifically determine a location of the determined fault in each of the plurality of conductors or each of the plurality of sensors.

A diagnostic system for a DC-DC voltage converter is provided. An analog to digital converter measures a first low voltage level at a low voltage terminal of a DC-DC voltage converter and generates a first low voltage value based on the first low voltage level. A first buck mode monitoring application sets a first buck mode status flag equal to a first fault value when the first low voltage value is greater than a first maximum voltage value. A first buck mode diagnostic handler application transitions each of the high voltage switch and the low voltage switch to an open operational state when the first buck mode status flag is equal to the first fault value.

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 synchronous buck converter is provided in which a replica transistor has its drain coupled to a drain of the low-side switch transistor. A current sensing amplifier drives a scaled current into the replica transistor such that the drain-to-source voltage of the replica transistor substantially equals the drain-to-source voltage of the low-side switch. The replica transistor is much smaller than the low switch transistor such that the replica transistor's on resistance is higher by a scale factor Kf as compared to the on resistance for the low-side switch transistor.

A switch-extender is connected to a measurement system and to several DUTs. It splits a signal from the measurement system into several signals so that the several DUTs receive the same signal and can therefore be tested in parallel. The switch-extender further includes at least one amplifier and/or at least one attenuator for every output port so that every signal has the same signal level no matter what the individual attenuation factor of the signal connectors or of the internal printed circuit board is. Furthermore a method for calibrating the measurement system as well as for the switch-extender and the signal connectors describes how to obtain the needed calibration values both for the downlink path and for the uplink path without changing the signal connector.