Embodiments disclosed herein are directed towards systems and methods for electric current leakage detection in a land seismic system. Embodiments may include generating at least one test signal using a digital to analog converter DAC circuitry, wherein the DAC circuitry includes an output operatively connected to earth ground. Embodiments may further include alternately grounding a positive path to an analog to digital converter ADC circuitry during a first time window and a negative path to the analog to digital converter during a second time window while measuring an ADC signal. Embodiments may also include determining an average amplitude of the first time window and the second time window and determining a leakage resistance based upon, at least in part, the average amplitude of the first time window and the second time window.

Circuits and methods are disclosed for determining a ground path impedance difference in a vehicle having master and slave control. An example circuit for detecting a difference in ground path impedance in a vehicle includes a master ground terminal and a slave ground terminal. The circuit also includes a first shunt resistor electrically coupled between the master ground terminal and a common internal ground, and a second shunt resistor electrically coupled between the slave ground terminal and the common internal ground. The circuit further includes a bi-directional current sense amplifier having as inputs the master ground terminal and the slave ground terminal.

A clamp meter to be used for detecting resistance of a ground loop on which the detection is to be performed includes a source transformer unit that is configured to receive an alternating input voltage signal and is capable of being electrically coupled to the ground loop on which the detection is to be performed; an induction transformer unit that is capable of being electrically coupled to the ground loop and the induction transformer unit being configured to be capable of generating an induced current signal as a response to the input voltage signal; a reference resistance loop that is electrically coupled to the source transformer unit and the induction transformer unit; and a processing controller that receives the induced current signal and the processing controller is configured to be capable of determining the resistance of the ground loop based on the induced current signal.

A clamp meter to be used for detecting resistance of a ground loop on which the detection is to be performed includes a source transformer unit that is configured to receive an alternating input voltage signal and is capable of being electrically coupled to the ground loop on which the detection is to be performed; an induction transformer unit that is capable of being electrically coupled to the ground loop and the induction transformer unit being configured to be capable of generating an induced current signal as a response to the input voltage signal; a reference resistance loop that is electrically coupled to the source transformer unit and the induction transformer unit; and a processing controller that receives the induced current signal and the processing controller is configured to be capable of determining the resistance of the ground loop based on the induced current signal.

According to certain exemplary embodiments, an inspection tool and method for inspecting a perforating gun segment includes, among other things, placing a perforating gun segment in a perforating gun segment holder between a male connecting portion and a female connecting portion, wherein each of the male connecting portion and female connecting portion includes one or more electrical contacts and distance sensors. A piston may push the male connecting portion against an internal gun assembly of the perforating gun segment such that the internal gun assembly is pushed to a desired location within the perforating gun segment, as measured by the distance sensors, and into electrical contact with the male and female connecting portions such that electrical properties of the perforating gun segment may be measured.

According to certain exemplary embodiments, an inspection tool and method for inspecting a perforating gun segment includes, among other things, placing a perforating gun segment in a perforating gun segment holder between a male connecting portion and a female connecting portion, wherein each of the male connecting portion and female connecting portion includes one or more electrical contacts and distance sensors. A piston may push the male connecting portion against an internal gun assembly of the perforating gun segment such that the internal gun assembly is pushed to a desired location within the perforating gun segment, as measured by the distance sensors, and into electrical contact with the male and female connecting portions such that electrical properties of the perforating gun segment may be measured.

An electronic apparatus includes an electronic panel including a first pad part and a second pad part having a portion electrically connected to the first pad part, a driving circuit including a bump part overlapping the first pad part in a plan view, and a circuit board including a lead part overlapping the second pad part in a plan view. The lead part including a plurality of test leads includes a first test lead group electrically connected to the first pad part, and a second test lead group insulated from the first pad part, and one test lead of the first test lead group and one test lead of the second test lead group are electrically connected to each other.

A system and method for determining material resistivity. A current of one or more frequencies is generated using a circuitry. The one or more frequencies is directed using one or more electrodes into a surround-ing material. The resistivity of the material surrounding the electrodes and a drilling tool is measured by detecting the current at the one or more fre-quencies.

A system and method for determining material resistivity. A current of one or more frequencies is generated using a circuitry. The one or more frequencies is directed using one or more electrodes into a surround-ing material. The resistivity of the material surrounding the electrodes and a drilling tool is measured by detecting the current at the one or more fre-quencies.

A testing system for testing a device under test including a plurality of circuits under test includes a probe card, testing apparatus, and a controller. The probe card includes a plurality of probes temporarily coupled to the circuits under test. The testing apparatus holds the probe card and tests the circuits under test through tine probe card. The controller controls the testing apparatus and executes a testing procedure that includes: measuring the contact resistance values between the probe card and each of the circuits under test; determining a statistical value of the contact resistance values; determining whether the statistical value exceeds a first threshold; when the statistical value does not exceed the first threshold, setting a clean flag to be in a first state; otherwise, setting the clean flag to be in a second state; and performing a clean operation on the probes according to the clean flag.