IEEE 1140-1994

IEEE 1140-1994 is a technical standard for measuring electric and magnetic fields from video display terminals (VDTs) across the 5 Hz to 400 kHz range. It provides a focused procedure for evaluating low-frequency field emissions associated with display equipment, helping users compare results in a consistent way. For engineers, test labs, and procurement teams, this standard supports clearer measurement practice and more reliable assessment of VDT-related electromagnetic exposure.

IEEE 1140-1994 overview

This standard addresses the measurement method rather than the design of the terminal itself. IEEE 1140-1994 is relevant in fields, waves and electromagnetics because it defines how to capture electric and magnetic field data from VDTs under specified frequency conditions. That makes it useful when repeatable test results are needed for analysis, reporting, or product qualification. Its value lies in reducing ambiguity around measurement setup and helping different parties obtain comparable outcomes.

Typical use cases

IEEE 1140-1994 is commonly used when evaluating display terminals in laboratories, product test programs, and electromagnetic field studies. It may support measurements on office equipment, workstation displays, or other VDT-based systems where low-frequency field behavior is of interest. The standard is also relevant during comparative testing, vendor documentation review, and internal compliance checks where a defined procedure is needed to measure emissions consistently across similar devices.

Why this standard matters

Accurate measurement of electric and magnetic fields is essential when results are used for compliance, engineering review, or risk reduction. IEEE 1140-1994 helps create consistency in how VDT-related field measurements are taken and reported, which can improve confidence in test data and limit avoidable variation between laboratories. For organizations handling display equipment, it can also support better technical procurement decisions and more controlled performance assessment.

• VDT field measurement procedure
• 5 Hz to 400 kHz frequency range
• Electric and magnetic field evaluation
• Test consistency and comparability
• Low-frequency electromagnetic context