IEEE 291-1991

IEEE 291-1991 is a technical standard for measuring the electromagnetic field strength of sinusoidal continuous waves from 30 Hz to 30 GHz. Grounded in the fields, waves and electromagnetics domain, it addresses how field measurements are approached across a wide frequency range, helping support consistent results in laboratory and field environments. For engineers and test teams, this document is useful when repeatable measurement methods matter for evaluation, comparison, and controlled electromagnetic work.

IEEE 291-1991 overview

This standard focuses on methods for determining electromagnetic field strength for continuous-wave signals, rather than on pulse measurements or unrelated RF topics. IEEE 291-1991 is relevant to situations where a sinusoidal source must be measured accurately across low-frequency through microwave ranges. Its technical value lies in establishing a common basis for measurement practice, which can help reduce ambiguity when comparing results, documenting test conditions, or using field-strength data in engineering analysis and compliance-related work.

Typical use cases

IEEE 291-1991 may be used in electromagnetic testing setups, instrumentation calibration workflows, and measurement programs involving antennas, transmitters, shielding studies, or controlled field exposures. Because it covers 30 Hz to 30 GHz, it can support work across power-frequency, radio-frequency, and microwave-related measurements where a sinusoidal continuous wave is the signal of interest. It is especially relevant when teams need a defined method for field-strength evaluation rather than an informal or ad hoc approach.

Why this standard matters

Consistent field-strength measurement is important for technical comparison, design validation, and risk reduction in electromagnetics work. IEEE 291-1991 helps create a shared method for measuring continuous-wave fields, which can improve confidence in test data and reduce disagreements between laboratories, suppliers, and engineers. In practice, that supports clearer procurement decisions, better documentation, and more reliable assessment of electromagnetic performance. For organizations working with field measurements, the standard can serve as a reference point for repeatable and defensible results.

• Continuous-wave field-strength measurement methods
• Frequency range: 30 Hz to 30 GHz
• Electromagnetic testing and analysis reference
• Useful for repeatable laboratory and field work