Pearson current monitor

Pearson current monitor (or incorrectly Pearson coil ) - a type of precision current transformer used for measurement of wideband, high-frequency or impulse currents.

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.

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

Typical applications
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). They usually offer better sensitivity than Rogowski coils , 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

Data sheet
Example of data sheets of Pearson Current Monitors: