IEC 61340-4-7-2017 PDF

Full title and description

Electrostatics — Part 4-7: Standard test methods for specific applications — Ionization. This international standard defines repeatable laboratory and field test methods and procedures for evaluating air ionization equipment (ionizers), establishing measurement techniques for offset voltage (ion balance) and decay (charge neutralization) time to support product selection, specification and periodic verification.

Abstract

IEC 61340-4-7:2017 provides standardized measurement procedures (including charged-plate decay and offset/ion-balance measurements) and test conditions for ionizers used in electrostatic control programs. The 2017 edition adds the option of contacting-plate voltage measurements in addition to non‑contacting methods, and is intended to be used by manufacturers, test laboratories and end users to supply and verify performance data for ionization equipment. The document does not address electromagnetic interference (EMI) testing or ionizer use with ordnance, flammables or electrically initiated explosive devices.

General information

• Status: Withdrawn / superseded — replaced by a later edition (IEC 61340-4-7:2025); the 2017 edition was withdrawn in 2025.
• Publication date: 6 January 2017.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.200.99, 29.020.
• Edition / version: Edition 2.0 (2017).
• Number of pages: 62 pages.

Key bibliographic details and withdrawal/supersession are recorded by IEC and national bodies.

Scope

Specifies laboratory and on-site test methods for evaluating ionizers: measurement of offset voltage (ion balance), measurement of decay time (charge neutralization) using charged plate methods, and associated test conditions and instrumentation. The procedures are intended to produce repeatable performance data for manufacturers and to be adapted by users for qualification and routine verification of ionization systems. The standard excludes EMI testing and specific use with explosive or ordnance applications.

Key topics and requirements

• Definitions and measurement principles for offset voltage (ion balance) and decay time (charge neutralization).
• Use of charged plate monitors (CPMs) and both non‑contacting and contacting plate voltage measurement techniques (contacting-plate methods were added in the 2017 edition).
• Specified test atmospheres, conditioning and measurement procedures to improve repeatability.
• Performance reporting formats for decay curves, offset voltage, and related environmental/test conditions.
• Guidance for selecting, qualifying and periodically verifying ionizers for a given application; safety notes regarding hazardous electrical or non‑electrical conditions during testing.

These topics form the measurable acceptance/qualification data most commonly provided by manufacturers and required by procurement/specification documents.

Typical use and users

Primary users are ionizer manufacturers (to publish performance data), independent test laboratories, ESD/QA engineers in electronics manufacturing, cleanroom and semiconductor facilities, and facility managers responsible for electrostatic control programs. Typical applications include product selection, acceptance testing, installation qualification and periodic performance verification of ionization equipment.

Related standards

Part of the IEC 61340 series on electrostatics; commonly referenced companion standards include IEC 61340-4-5 (footwear and flooring + walking tests), IEC 61340-4-3 (footwear test methods), IEC 61340-4-6 (wrist straps) and IEC 61340-2-x measurement and resistance methods, and IEC 61340-5-1 (ESD control program requirements). Users often apply these together when specifying complete personnel/floor/ionization control systems.

Keywords

ionization, ionizer, electrostatics, ESD control, charged plate monitor, offset voltage, ion balance, decay time, charge neutralization, test method, IEC 61340

FAQ

Q: What is this standard?

A: IEC 61340-4-7:2017 is an international test-method standard that specifies how to measure ionizer performance (offset/ion balance and decay/neutralization) for electrostatic control applications.

Q: What does it cover?

A: It covers repeatable measurement procedures and test conditions (charged-plate decay and plate voltage measurements, environmental conditioning, reporting) to characterize ionizer behavior for selection, qualification and verification; it explicitly excludes EMI testing and certain hazardous ordnance/explosive uses.

Q: Who typically uses it?

A: Manufacturers of ionizers, independent test labs, ESD/quality engineers in electronics and semiconductor manufacturing, cleanroom managers and procurement/specification authors.

Q: Is it current or superseded?

A: The 2017 edition (Edition 2.0) has been superseded by a later IEC edition published in 2025; the 2017 text was withdrawn in 2025 and users should consult the 2025 edition for the current normative text and any changed test methods or requirements.

Q: Is it part of a series?

A: Yes — it is Part 4‑7 of the IEC 61340 series on electrostatics (the series includes other Parts addressing floorings, footwear, wrist straps, garments, measurement methods and ESD program requirements).

Q: What are the key keywords?

A: Ionization, ionizer, charged plate monitor, offset voltage, ion balance, decay time, charge neutralization, ESD control, electrostatics, IEC 61340.