What are Current Probes?

Current Probes are used in EMC testing to measure common-mode and differential-mode currents flowing on cables, harnesses, and conductors without requiring direct electrical contact. These probes operate as current transformers, coupling the magnetic field generated by the current into a measurement device such as a spectrum analyzer or EMI receiver. They are widely used in conducted emissions measurements and in immunity testing setups to monitor injected currents and verify test levels.

Key performance parameters of Current Probes include frequency range, transfer impedance, sensitivity, and dynamic range. These probes typically operate over frequencies ranging from a few kilohertz to several hundred megahertz or higher, depending on the design. Transfer impedance defines the relationship between the measured voltage and the actual current, and calibration data is used to convert measurement results into accurate current values. High sensitivity and low insertion loss are important to ensure precise measurement of low-level currents without disturbing the system under test.

Current Probes are available in clamp-on or split-core designs, allowing easy placement around cables of different sizes. They are engineered to provide consistent coupling and stable performance across the operating frequency range. Proper probe positioning, cable routing, and grounding are critical factors that influence measurement accuracy and repeatability. In many test setups, Current Probes are used in combination with Bulk Current Injection probes to monitor and control injected currents during immunity testing.

Current Probes are widely used in EMC compliance testing, automotive electronics validation, aerospace systems testing, industrial equipment analysis, and research environments. They are essential for identifying sources of electromagnetic interference, verifying compliance with standards, and optimizing system design for improved EMC performance.

The Largest Database of Current Probes

EMC Directory lists Current Probes from the leading manufacturers. Use the parametric search tools to narrow down on Current Probes based on your requirements. Once you find products that meet your specification, view product details, download the datasheet, compare products and request quotations. Inquiries generated via everything RF are directed to the manufacturers, who get back to you with a quote or information.