Pearson current monitor, Pearson current transformer¹⁾, Pearson probe²⁾, or Pearson coil³⁾ - a type of precision current transformer used for measurement of wideband, high-frequency or impulse currents.

Pearson current monitor model 110A (10 kA)

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A family of Pearson current monitors

^{Copyrights © Pearson Electronics, Inc.}

Pearson current monitors are not a separate class of devices, and their design follows rules required for high-frequency current transformers. The name “Pearson” is a registered trademark of Pearson Electronics Inc. who began production of such devices in 1950s.⁴⁾

Nowadays the company specialises in precision, wide-band and high-frequency current sensors.⁵⁾

A common feature is that the device is equipped with BNC plug suitable for direct connection to an oscilloscope, through a 50 Ω coaxial cable.

The Pearson current monitors can be used over similar range of frequencies and currents as Rogowski coils (from single Hz to MHz), but they usually offer better sensitivity⁶⁾, but the cores are rigid so cannot be used in applications were flexible Rogowski coils are required.

Typical applications include:

• pulse current at high voltages, e.g. associated with microwave of X-ray tube modulators, particle accelerators and lasers
• current transients and harmonics in power systems
• lightning-strike currents
• pulsed charged-particle beam currents
• currents in electrolytes and plasmas
• EMI currents
• video and RF currents
• spot and induction welding currents
• antenna phasing
• flash-tube currents

Example of data sheets of Pearson Current Monitors:

• current transformer
• Rogowski coil

• http://www.pearsonelectronics.com - official website of Pearson Electronics, Inc.