Voltage Measurement under High Common-Mode Interference: Optically Isolated Probes
New-energy growth has accelerated power-semiconductor development in PV, wind, EVs and transport: higher voltages, faster switching, lower losses - and ever trickier problems from the high-voltage, high-frequency environment. The complex electromagnetic fields around switching devices make common-mode interference an ever bigger issue in electronic measurement. How do you keep measurements accurate under high voltage and high frequency?
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MRI: High-Precision DC Measurement
In an MRI system the gradient amplifier comprises all circuitry associated with the gradient magnetic field. It supplies a fast-switching gradient field with the required linearity, determining slice position and thickness; gradient-coil linearity is the yardstick of field uniformity.
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What Is a Coaxial Shunt (CVR)?
A shunt resistor is placed directly into the current path. It therefore not floating, and normally only used where circuit potentials are low. The voltage across the provides an absolute measurement of A ‘coaxial’ a that has been designed to have almost no inductance (e.g. 2 nH)
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Efficient Power Measurement and Analysis, Part 2
This article continues 'Efficient power measurements and analysis (1)'.
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Efficient Power Measurement and Analysis, Part 1
Power-supply designers face growing pressure to achieve 90% or higher conversion efficiency, driven by longer battery life in portable devices, the IoT, and demand for lower-power, 'greener' products. Many designs now replace silicon FETs and IGBTs with GaN or SiC switching devices. As always, time-to-market pressure keeps pushing test speed upward - while accuracy must remain very high.
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Three Drivers of Automotive Innovation: Electrification and Battery Testing
Electrification, connectivity and intelligence - together with their distinctive test challenges and solutions - are driving a new revolution across the automotive industry.
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Next-Generation E/E Architecture for Connected Vehicles
The core of the intelligent connected vehicle is its new-generation electrical/electronic architecture - what does its evolution bring to the new generation of cars?
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800 V Fast Charging and the Electric-Drive Transition: a Test Perspective
800 V ultra-fast charging is the foundation of next-generation new-energy vehicles.
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Six Reasons SiC MOSFET Gate-Voltage Measurements Go Wrong
Switching characteristics - expressed by the drive voltage, terminal voltage and terminal current during the switching process - are among the most important properties of power semiconductor switches.
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Inside a Power-Device Double-Pulse Test Platform
With advanced power devices arriving and converter design becoming ever finer, both device engineers and power-supply engineers are paying more and more attention to double-pulse testing.
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