Systems and methods relating to voltage monitoring across isolation barriers are disclosed herein. In one example embodiment, an isolation system includes a low voltage circuit portion including a first control logic portion, and a high voltage circuit portion including a second control logic portion and an analog-to-digital converter portion. The system further includes a first transistor device having a first terminal coupled at least indirectly to a first connection having a first voltage level and a second terminal coupled at least indirectly to a second connection having a second voltage level. The first control logic portion governs provision of an output signal generated based at least indirectly upon the second voltage level. Due to a galvanic barrier, the output signal can be provided for receipt by another device in a manner that avoids exposure of that device to an undesirably high current or power level.

According to some embodiments, a computer-implemented method is applied to calibrate a wireless test module (WTM) of a wireless harness automated measurement system (WHAMS) using a computer server and a calibration fixture. The WTM includes a plurality of field effect transistors (FETs). The calibration fixture includes a plurality of resistors. The method measures, using the calibration fixture, a first/second resistance value of the plurality of FETs from a first/second internal measurement test for the WTM. The method determines a resistance calibration value by subtracting the first resistance value from the second resistance value. The method measures a plurality of calibration factors to determine a measured resistor value for a target resistor value for a respective resistor of the calibration fixture.

An electric power line monitoring, communication and response system schedules the transmission of packets to occur during voltage zero-crossing intervals when corona is minimized. The transmitters may be located at high voltage hanging directly from the power line conductors along with associated current transformers and voltage sensors. A system of these transmitters distributed throughout the power grid communicate with each other in a data-forward manner to bring complete, real-time current and voltage waveform, device status and fault monitoring information to data aggregation waypoints, such as transmission substations where supervisory control and data acquisition (SCADA) equipment is installed. The power line monitoring data is then transmitted from the data waypoints to a central monitoring and control center, typically using existing SCADA equipment, to provide h detailed power line monitoring data for a large number of data monitoring points distributed throughout the power grid.

There is provided a non-contact voltage measuring sensor (1) in which a detection probe (11) is configured with a leaf spring and in which, when an external force is applied, the detection probe (11) deforms winding in a direction in which a tension of the leaf spring acts.

A device for measuring voltage across a remote load comprises a power supply configured to output a first output voltage to the remote load. A switch is selectively movable from a closed position to an open position. A measuring circuit measures a load voltage across the load when the switch is in the open position and determines a voltage difference between the first output voltage and the load voltage. The measuring circuit may adjust the first output voltage to a second output voltage to compensate for the voltage difference. A second A/D converter may be coupled to the power supply the load capacitor. The second A/D converter may measure a voltage across a resistor wherein a change in the voltage indicates a change in the load voltage. The power supply may be adjusted to output a second output voltage to compensate for any change in load voltage.

The present disclosure provides a voltage detector capable of alerting a worker to nearby presence of a voltage source regardless of the worker's awareness simply by being worn on the worker's body. In a voltage detector for detecting approach to a voltage source, a voltage induced in a human body due to approach to a voltage source is measured by a first electrode of a detection circuit, a voltage to ground is measured by a second electrode of the same circuit, the detection circuit captures a current generated due to a difference between an electric potential of the first electrode and an electric potential of the second electrode, and output from the detection circuit is displayed for warning when the human body insulated from the ground approaches the voltage source.

An absence of voltage indicator has an isolation circuit, an FM modulator attached to the isolation circuit, a reference oscillator, and a mixer attached to the reference oscillator and the FM modulator, wherein the output of the mixer is the difference of the two signals. In one embodiment, the FM modulator includes a variable capacitor which varies in response to a voltage in parallel to a fixed capacitor and an inductor in parallel to the capacitors.

According to some embodiments, a computer-implemented method is applied to calibrate a wireless test module (WTM) of a wireless harness automated measurement system (WHAMS) using a computer server and a calibration fixture. The WTM includes a plurality of field effect transistors (FETs). The calibration fixture includes a plurality of resistors. The method measures, using the calibration fixture, a first/second resistance value of the plurality of FETs from a first/second internal measurement test for the WTM. The method determines a resistance calibration value by subtracting the first resistance value from the second resistance value. The method measures a plurality of calibration factors to determine a measured resistor value for a target resistor value for a respective resistor of the calibration fixture.

A voltage measurement device may include a busbar electrically connected to a first terminal and a second terminal that are electrically connected to a battery cell, with the busbar extending in a first direction. A shunt resistance may be positioned on the busbar and extend in a second direction that intersects the first direction. A measurement unit is configured to measure a first voltage value applied to a first sub-region of the shunt resistance and measure a second voltage value applied to a second sub-region of the shunt resistance.