IEC 61326-1 EMC Testing: General Requirements for Measurement & Control Equipment

IEC 61326-1 General EMC Requirements Testing

Compatible Electronics provides comprehensive testing to IEC 61326-1 — the foundational general requirements standard for EMC compliance of electrical equipment for measurement, control, and laboratory use. Our NVLAP accredited laboratory holds direct accreditation for IEC 61326-1 (2005-12) and EN 61326-1 (2006 and 2013) at three California locations.

NVLAP Accredited ILAC MRA Recognized ISO/IEC 17025:2017 All 3 CA Locations

What is IEC 61326-1?

IEC 61326-1 establishes the general EMC requirements applicable to all electrical equipment intended for measurement, control, and laboratory use. It is the base standard of the IEC 61326 series — every piece of measurement or control equipment starts with Part 1, and specific Part 2 standards add or modify requirements for specialized equipment types.

The standard applies broadly: oscilloscopes, multimeters, PLCs, data loggers, environmental monitoring instruments, laboratory analytical equipment, process controllers, and industrial sensors — if it measures, controls, or is used in a laboratory context, IEC 61326-1 is almost certainly the applicable EMC standard.

EN 61326-1 is the European adoption of IEC 61326-1 and is a harmonized standard under the EMC Directive 2014/30/EU. Testing to EN 61326-1 provides presumption of conformity with the essential requirements of the EMC Directive, enabling CE marking for the EU market.

Scope and Applicability

Covered Equipment

What IEC 61326-1 Covers

Professional and industrial process use equipment
Educational use laboratory instruments
AC mains powered, DC powered, and battery-operated equipment (when connected to mains for charging)
Equipment with rated input current ≤16 A per phase for power quality tests
Both stand-alone instruments and systems

Exclusions

What Falls Outside IEC 61326-1

Medical electrical equipment (covered by IEC 60601-1-2)
Radio and telecommunications terminal equipment
Automotive on-board equipment (see CISPR 25)
Equipment covered by more specific product family standards
Equipment not intended for measurement, control, or laboratory use

Electromagnetic Environments

Installation Environments

Basic environment — residential, commercial, and light-industrial (Class B emissions)
Industrial environment — heavier industrial installations (Class A emissions; higher immunity)
Controlled environment — shielded rooms and filtered supplies (relaxed immunity requirements)
Test levels selected by manufacturer based on intended installation

Accredited Standards — Compatible Electronics Scope

Our NVLAP accreditation (Lab Code 200527-0, effective 2025-06-05 through 2026-06-30) includes the following IEC 61326-1 standards:

Current Version

EN 61326-1 (2013)

Accredited at Lake Forest/Silverado, Brea, and Newbury Park
Current harmonized standard for CE marking under EMC Directive 2014/30/EU
Applicable for all new CE marking projects

Prior Versions

IEC 61326-1 (2005-12) & EN 61326-1 (2006)

IEC 61326-1 (2005-12) — accredited at all three locations
EN 61326-1 (2006) — accredited at Lake Forest/Silverado and Brea
Available for legacy product testing and comparative assessments

Port Definitions and Test Configuration

IEC 61326-1 defines EMC testing in terms of equipment ports — the physical boundaries at which electromagnetic energy can enter or leave the equipment. Understanding ports is essential for a correct test plan.

Power Ports

AC Mains & DC Power Input

AC mains input port — conducted emissions via LISN; surge and EFT immunity
DC power input port — conducted emissions; conducted RF immunity injection
Power quality tests (harmonics, flicker) on AC mains input

Signal Ports

Measurement & Control Signal Ports

Analog measurement input/output ports
Digital communication ports (RS-232, RS-485, Ethernet, USB, etc.)
Conducted RF immunity injection via CDN or coupling clamp
EFT/Burst injection on signal ports with applicable coupling

Enclosure Port

Equipment Housing

Radiated emissions measurement from enclosure port
ESD immunity testing — contact and air discharge
Radiated RF immunity — enclosure exposure
Power frequency magnetic field immunity

Earth/Ground Port

Protective Earth Connection

Earth/ground port — functional earth connections to chassis
Surge immunity line-to-earth test path
Critical for accurate immunity test configuration

Emissions Requirements

CISPR 11

Radiated & Conducted Emissions

Group 1 classification for equipment using RF energy only for internal function
Class A limits — industrial environment equipment
Class B limits — residential and commercial environment equipment
Conducted: 150 kHz to 30 MHz via LISN on all current-carrying conductors
Radiated: 30 MHz to 1 GHz (and above) at 10 m or 3 m measurement distance

IEC 61000-3-2

Harmonic Current Emissions

Equipment input current ≤16 A per phase
Class A, B, C, or D classification by equipment type
Measurement over a minimum 10-second observation window
EN 61000-3-2 (2014) accredited at all three locations

IEC 61000-3-3

Voltage Fluctuations & Flicker

Limitation of voltage changes in public low-voltage supply
Pst (short-term flicker) and Plt (long-term flicker) assessment
Applicable to equipment not subject to conditional connection
IEC 61000-3-3 (2013) accredited at Lake Forest/Silverado

Immunity Requirements

Basic Environment

Residential / Commercial Levels

ESD (IEC 61000-4-2): ±4 kV contact, ±8 kV air — Criterion B
Radiated RF (IEC 61000-4-3): 3 V/m, 80 MHz–1 GHz — Criterion A
EFT/Burst (IEC 61000-4-4): 1 kV power, 0.5 kV signal — Criterion B
Surge (IEC 61000-4-5): 0.5 kV L-L, 1 kV L-E — Criterion B
Conducted RF (IEC 61000-4-6): 3 Vrms — Criterion A
Magnetic Field (IEC 61000-4-8): 1 A/m — Criterion A
Voltage Dips (IEC 61000-4-11): per table — Criterion B/C

Industrial Environment

Heavy Industrial Levels

ESD (IEC 61000-4-2): ±6 kV contact, ±8 kV air — Criterion B
Radiated RF (IEC 61000-4-3): 10 V/m — Criterion A
EFT/Burst (IEC 61000-4-4): 2 kV power, 1 kV signal — Criterion B
Surge (IEC 61000-4-5): 1 kV L-L, 2 kV L-E — Criterion B
Conducted RF (IEC 61000-4-6): 10 Vrms — Criterion A
Magnetic Field (IEC 61000-4-8): 30 A/m continuous — Criterion A

Documentation Requirements

IEC 61326-1 and the EMC Directive require manufacturers to maintain comprehensive technical documentation. Compatible Electronics test reports are structured to support all required documentation elements:

Technical Documentation / Technical Construction File

The accredited test report from Compatible Electronics forms the core of the technical file, documenting test configuration, operating conditions, measurement results, pass/fail assessment, and calibration traceability — all required for CE marking documentation.

Declaration of Conformity Support

Our test reports cite the specific standard versions tested (e.g., EN 61326-1:2013) and the directives satisfied, providing the exact information needed for the EU Declaration of Conformity. Reports are retained at minimum 10 years as required.

Installation and User Instructions

IEC 61326-1 requires that installation conditions assumed during testing be documented. Our test reports record all installation assumptions — cable configurations, representative operating modes, and environmental conditions — enabling accurate user documentation.

Real-World Testing Examples

Benchtop Oscilloscope — EN 61326-1 + FCC Part 15 Combined

A test and measurement instrument manufacturer needed simultaneous CE marking and FCC compliance for a 200 MHz benchtop oscilloscope. Compatible Electronics performed EN 61326-1 (2013) emissions (CISPR 11 Class B conducted and radiated) and the full immunity test plan. The same CISPR 11 radiated and conducted emissions measurements also satisfied FCC Part 15 Subpart B via ANSI C63.4 — one test session producing both a CE marking EN 61326-1 NVLAP accredited report and an FCC compliance report. The instrument passed at Class B emissions limits and demonstrated Criterion A performance throughout all immunity tests, confirming it could operate normally in commercial environments.

Industrial Temperature Controller — EN 61326-1 Industrial + CE Marking

A process control manufacturer needed CE marking for a DIN-rail mounted temperature controller intended for industrial process environments (ovens, furnaces, and chemical reactors). The manufacturer declared an industrial electromagnetic environment, requiring CISPR 11 Class A emissions and the higher-level industrial immunity test suite. Compatible Electronics tested to EN 61326-1 (2013) at industrial environment test levels, including 10 V/m radiated RF immunity, 10 Vrms conducted RF, 2 kV surge on AC mains, and 30 A/m power frequency magnetic field. Performance criterion A was demonstrated throughout — the controller continued to maintain setpoint within specification during all immunity tests. The test report supported CE marking under the EMC Directive and Low Voltage Directive.

Environmental Data Logger — EN 61326-1 + ICES-003 + RCM

An environmental monitoring company needed compliance for a battery-powered, mains-chargeable field data logger sold in the EU, Canada, and Australia. Compatible Electronics performed EN 61326-1 (2013) testing in battery-operated mode (the product's primary use) and while connected to the mains charger — both operating modes required separate emissions assessments. The CISPR 11 emissions data simultaneously satisfied ICES-003 Issue 7 (Canada) and AS/NZS CISPR 32 (Australia RCM). The complete multi-market package — CE marking, ISED, and RCM — was delivered from a single test engagement, allowing the manufacturer to begin global sales within weeks rather than months.

Why Choose Compatible Electronics?

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Direct EN 61326-1 (2013) Accreditation

NVLAP accredited for the current harmonized standard at all three California locations — immediate availability for CE marking projects.

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Emissions + Immunity in One Lab

Complete IEC 61326-1 compliance package — CISPR 11 emissions, power quality, and all IEC 61000-4 immunity tests — from a single accredited laboratory.

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ILAC MRA Recognized Reports

Test reports accepted by EU market surveillance authorities for CE marking Declaration of Conformity — no overseas retesting required.

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Multi-Market Testing Efficiency

EN 61326-1 + FCC Part 15, ICES-003, and AS/NZS CISPR standards all supported in one session — global market access from a single California lab visit.

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