Rogowski Coils vs. Coaxial Shunts: A Comparison
Coaxial shunt or Rogowski coil for current measurement in double-pulse testing? There is no perfect answer - it depends on which figures matter most to your test, and on installation conditions. The two can be used together without interference and cross-check each other.
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Rogowski Coils vs. Other Current Probes: Strengths and Weaknesses
The Rogowski coil - also called a Rogowski current transformer or air-core coil - is an electronic transformer for measuring AC current: fast transients, pulsed currents in power devices, or 50 Hz and higher-frequency AC signals.
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Low-Voltage Differential Probes: PMK vs. Tektronix
Probes come in many types for different environments, and choosing the right one is a common headache. This article compares low-voltage differential probes from two brands to help you select.
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Rogowski Coil Low-Frequency and Droop Characteristics
In principle a Rogowski coil cannot measure DC, so its detection sensitivity falls at low frequency; the -3 dB point is usually taken as the low-frequency cutoff. When the signal contains low-frequency components, the measured result can deviate from the actual current - take care in use. The cutoff and its roll-off specification vary by model; the roll-off (droop) characteristic refers to the response to a step pulse and is tabulated in Table 1.
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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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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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Why Grounding Matters for Test Equipment
With an oscilloscope or any measurement instrument, correct grounding is essential. Without a reliable ground, results may be inaccurate and equipment may even be damaged. Good grounding keeps results consistent, reduces interference and provides a safer working environment for operators and equipment alike.
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Choosing a High-Voltage Oscilloscope Probe in Five Minutes
High-voltage circuits pose unique measurement challenges: risk to people and equipment, and differing needs across high-voltage semiconductor materials. Floating high-voltage measurement is dangerous and difficult; passive probes are unsuitable, leaving isolated and high-voltage differential probes as the options - with many models to choose from. Using a real example - probe selection for switching-loss tests on a full-bridge GaN circuit - we show how to pick the right high-voltage probe for your application.
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Choosing the Right Probe for Power-Electronics Applications
Power electronics is central to modern electronic design, and designers and consumers alike want longer battery life in tablets, phones, headsets and electric vehicles. The field covers four key classes: AC/DC rectifiers, DC/DC converters, DC/AC inverters and AC/AC converters - and it matters greatly to sustainable generation such as distributed generation (DG), microgrids (MG) and smart grids (SG).
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Typical Oscilloscope Voltage Probe Circuits
Knowing how a probe works lets you use it better - and more safely.
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