SIST EN IEC 61308:2026
(Main)High-frequency dielectric heating installations - Test methods for the determination of power output (IEC 61308:2026)
- Abstract
This document specifies test methods for the determination of useful high frequency power output in equipment for industrial heating and processing of materials. It is in particular applicable to HF generators made available to users as separate units.
This document is basically applicable to equipment operating in the frequency range 100 kHz to 300 MHz, as defined in IEC 60519-1, with the following limitations.
– This document does not apply to induction heating, which it is possible to carry out in the lower part of the specified frequency band.
– The ISM centre frequencies for dielectric heating and processing of industrial interest are narrow bands about 6,78 MHz, 13,56 MHz, 27,12 MHz and 40,68 MHz.
– This document is not applicable to:
• appliances for household and similar use;
• commercial use;
• laboratory use;
• medical high frequency equipment.
For equipment working in designated ISM bands, it is a legal requirement that the frequency remains within the ISM bands according to CISPR 11, but the resonant frequency of the circuit varies with the change of dielectric parameters of the load. Therefore, the value of the mean output power in the work cycle can be much lower than the value obtained under the test conditions. This value depends upon the response of the tuning system.
NOTE 1 The following criteria are suitable for determination of the classification as industrial equipment:
– commercial equipment is typically designed and planned for series production of many identical units;
– industrial equipment is typically produced in small series or even as single units; the processed goods are consumed or ready for final use at the end of the heating process.
NOTE 2 Heating a workload with dielectric parameters which change significantly in time and/or with temperature, the value of the output power obtained with the actual charge can be different from that obtained with the test load specified in this document.
This document relates to equipment normally operating under continuous rated conditions.
- Status
- Published
- Public Enquiry End Date
- 31-Jul-2025
- Publication Date
- 23-Sep-2026
- Technical Committee
- I09 - Imaginarni 09
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 22-Sep-2026
- Due Date
- 27-Nov-2026
- Completion Date
- 24-Sep-2026
SIST EN IEC 61308:2026 is the Slovenian adoption of EN IEC 61308:2026. It specifies test methods for determining useful high-frequency power output in industrial high-frequency dielectric heating and processing equipment, especially HF generators supplied as separate units.
For engineers, quality managers, and buyers, this standard tells you how to measure output power with defined loads and procedures so results are comparable across installations and product types.
What does SIST EN IEC 61308:2026 specify?
SIST EN IEC 61308:2026 specifies how to determine useful high-frequency power output for equipment used in industrial heating and processing of materials. It focuses on test methods, not on product design, and it is centered on equipment that normally operates under continuous rated conditions.
The scope limits the document to industrial HF equipment in the IEC 60519-1 context and excludes induction heating, household and similar appliances, commercial use, laboratory use, and medical high-frequency equipment. The scope also notes that, in designated ISM bands, the operating frequency must remain within the band while the measured mean output power can differ from the value obtained under test conditions because of load and tuning effects.
The document is organized into these main parts:
| Part | What it covers |
|---|---|
| Clause 1 | Scope and field of application |
| Clause 2 | Normative references |
| Clause 3 | Terms and definitions |
| Clause 4 | Test loads |
| Clause 5 | Description of tests |
| Annex A | Informative recommended circuit for the lamp-load method |
What are the key requirements of SIST EN IEC 61308:2026?
SIST EN IEC 61308:2026 gives several alternative ways to measure output power, chosen according to the equipment design and the accessibility of the generator terminals. In practice, the document helps the user select a load that behaves like the normal load, then measure or estimate output power in a repeatable way.
Scope of the test methods
Clause 1 says the methods are for industrial HF heating and processing equipment, with particular relevance to HF generators supplied as separate units. This matters because the test setup depends on whether the generator can be disconnected from the applicator and whether the load is directly accessible.
Clause 1 also explains that some equipment classes are outside the document, so the standard is meant for industrial installations rather than general-purpose or medical equipment. That helps a purchaser or test lab choose the right procedure before planning measurements.
Test loads and load matching
Clause 4 says the test load should represent the normal load as closely as practical, including impedance and physical behavior. This is important because output power in HF systems depends strongly on matching between the generator and the load.
Clause 4 identifies four main test-load approaches:
- calorimetric load
- lamp load
- matched resistive load
- wet-sand load
It also notes that the calorimetric, lamp, and resistive loads are used to measure generator output, while the wet-sand load is used to measure useful output power in some cases.
Calorimetric load method
Clause 5.2 describes the calorimetric method as a water-based substitute load with electrodes and a low-loss container. The generator is run with the normal load, then transferred to the calorimetric load with minimal change to tuning so the operating condition can be matched.
In practice, this is the main method for higher-power equipment because it gives a direct power calculation from water flow and temperature rise. The clause also requires careful temperature measurement close to the load and adequate mixing of the water so the result is not distorted by heat loss or local hot spots.
Lamp-load method
Clause 5.3 describes the lamp-load temperature method, where incandescent lamps form the load and a comparison lamp is used to match temperature under mains-frequency supply. This method works only when the generator output terminals are accessible.
The document notes that the method becomes less suitable at higher HF frequencies and is practically not applicable at the upper end of the range. In practice, that means it is mainly a lower-power, bench-style method for installations where lamp loading is a realistic substitute.
Matched resistive load method
Clause 5.4 allows a low-reactance resistive load when the generator can be connected directly to the load. The power is found from electrical measurements at the resistor.
This is the simplest method when the equipment can drive a suitable resistor directly. It is useful for test setups where a well-defined electrical load is easier to use than a thermally based method.
Wet-sand load method
Clause 5.5 uses a wet-sand load placed in the applicator for some Type B equipment. The method relies on heating a known sand-and-water charge and determining the output from the change in water content after heating.
This method is less precise than the calorimetric or lamp-load approaches, but it can be practical when the normal load cannot be substituted directly. The clause says the estimated inaccuracy should be reported, so the result is treated as an approximate engineering measurement rather than a high-precision test.
Plastic welders and Type B equipment
Clause 5.6 covers high-frequency dielectric plastic welders. If the generator terminals are accessible, the output is measured with one of the standard load methods; if not, the document allows a test using the plastic welding test electrode defined in Clause 3.
Clause 5.7 addresses Type B equipment, where direct output measurement is not possible. In that case, output power is calculated from manufacturer data and circuit efficiency assumptions, so users need design data or validated internal information rather than a direct power meter reading.
What terms does SIST EN IEC 61308:2026 define?
SIST EN IEC 61308:2026 defines the key terms needed to choose the correct test method.
- Type A equipment - high-frequency equipment where the converter or generator is separate from, or separable from, the applicator.
- Type B equipment - high-frequency equipment where the generator is directly coupled to the applicator, such as in a plastic welding press or tunnel oven.
- Useful output power - for Type A equipment, the maximum power measured in a test load; for Type B equipment, the high-frequency power developed in the normal load.
- Calorimetric load - a substitute load that measures output power by absorbing energy in water and using the temperature rise for the calculation.
- Lamp load - a load made from incandescent lamps, used with temperature comparison to infer output power.
- Wet-sand load - a charge of wet sand with impedance similar to the normal load, used for some Type B equipment.
- Plastic welding test electrode - a cutting-edge welding electrode used to evaluate output power when generator terminals are not accessible.
Who uses SIST EN IEC 61308:2026?
SIST EN IEC 61308:2026 is used by manufacturers of industrial electroheating and electromagnetic processing equipment, especially makers of HF generators and plastic welding machines. It is also used by test laboratories, commissioning engineers, quality teams, and technical buyers who need a defined way to verify power output.
In practice, the standard supports output-power checks for separate generators, integrated Type B installations, and plastic welders. It is relevant wherever the buyer or operator needs a repeatable test method instead of a claim based only on rated output.
What changed in SIST EN IEC 61308:2026 from the previous edition?
SIST EN IEC 61308:2026 replaces SIST EN 61308:2006. The third edition is described as a technical revision.
The stated changes are:
- alignment with more recent editions of IEC 60519-1 and IEC 60519-6
- more detailed descriptions of the calorimetric load test
- more detailed evaluation of output power for dielectric plastic welders
Which standards are used with SIST EN IEC 61308:2026?
SIST EN IEC 61308:2026 refers to these standards in its normative references:
- IEC 60050-841 - provides the industrial electroheat vocabulary used for the terms in Clause 3.
- IEC 60519-1 - provides the general safety requirements context for electroheating and electromagnetic processing.
- IEC 60519-6 - provides particular safety requirements for high-frequency dielectric and microwave heating and processing equipment.
The scope also mentions CISPR 11 in relation to operating in designated ISM bands and keeping frequency within those bands.
What does the SIST EN IEC 61308:2026 document contain?
SIST EN IEC 61308:2026 contains practical test-load constructions, measurement procedures, and calculation or estimation methods for output power. It gives the user several ways to verify power, depending on whether the equipment is best tested with water, lamps, a resistor, wet sand, or a plastic-welding electrode.
The document also includes figures showing example calorimeter loads, the lamp-load circuit, lamp-load arrangements, and the plastic welding test electrode. Annex A adds an informative recommended circuit for the lamp-load method, including a photoelectric-cell based calibration approach.
Relations
- Effective Date
- 01-Nov-2026
- Effective Date
- 01-Sep-2026
- Effective Date
- 01-Sep-2026
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Frequently Asked Questions
SIST EN IEC 61308:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "High-frequency dielectric heating installations - Test methods for the determination of power output (IEC 61308:2026)". This standard covers: This document specifies test methods for the determination of useful high frequency power output in equipment for industrial heating and processing of materials. It is in particular applicable to HF generators made available to users as separate units. This document is basically applicable to equipment operating in the frequency range 100 kHz to 300 MHz, as defined in IEC 60519-1, with the following limitations. – This document does not apply to induction heating, which it is possible to carry out in the lower part of the specified frequency band. – The ISM centre frequencies for dielectric heating and processing of industrial interest are narrow bands about 6,78 MHz, 13,56 MHz, 27,12 MHz and 40,68 MHz. – This document is not applicable to: • appliances for household and similar use; • commercial use; • laboratory use; • medical high frequency equipment. For equipment working in designated ISM bands, it is a legal requirement that the frequency remains within the ISM bands according to CISPR 11, but the resonant frequency of the circuit varies with the change of dielectric parameters of the load. Therefore, the value of the mean output power in the work cycle can be much lower than the value obtained under the test conditions. This value depends upon the response of the tuning system. NOTE 1 The following criteria are suitable for determination of the classification as industrial equipment: – commercial equipment is typically designed and planned for series production of many identical units; – industrial equipment is typically produced in small series or even as single units; the processed goods are consumed or ready for final use at the end of the heating process. NOTE 2 Heating a workload with dielectric parameters which change significantly in time and/or with temperature, the value of the output power obtained with the actual charge can be different from that obtained with the test load specified in this document. This document relates to equipment normally operating under continuous rated conditions.
This document specifies test methods for the determination of useful high frequency power output in equipment for industrial heating and processing of materials. It is in particular applicable to HF generators made available to users as separate units. This document is basically applicable to equipment operating in the frequency range 100 kHz to 300 MHz, as defined in IEC 60519-1, with the following limitations. – This document does not apply to induction heating, which it is possible to carry out in the lower part of the specified frequency band. – The ISM centre frequencies for dielectric heating and processing of industrial interest are narrow bands about 6,78 MHz, 13,56 MHz, 27,12 MHz and 40,68 MHz. – This document is not applicable to: • appliances for household and similar use; • commercial use; • laboratory use; • medical high frequency equipment. For equipment working in designated ISM bands, it is a legal requirement that the frequency remains within the ISM bands according to CISPR 11, but the resonant frequency of the circuit varies with the change of dielectric parameters of the load. Therefore, the value of the mean output power in the work cycle can be much lower than the value obtained under the test conditions. This value depends upon the response of the tuning system. NOTE 1 The following criteria are suitable for determination of the classification as industrial equipment: – commercial equipment is typically designed and planned for series production of many identical units; – industrial equipment is typically produced in small series or even as single units; the processed goods are consumed or ready for final use at the end of the heating process. NOTE 2 Heating a workload with dielectric parameters which change significantly in time and/or with temperature, the value of the output power obtained with the actual charge can be different from that obtained with the test load specified in this document. This document relates to equipment normally operating under continuous rated conditions.
SIST EN IEC 61308:2026 is classified under the following ICS (International Classification for Standards) categories: 25.180.10 - Electric furnaces. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN IEC 61308:2026 has the following relationships with other standards: It is inter standard links to SIST EN 61308:2006, SIST EN IEC 60519-1:2020, SIST EN IEC 60519-6:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN IEC 61308:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2026
Nadomešča:
SIST EN 61308:2006
Inštalacije za visokofrekvenčno dielektrično segrevanje - Preskusne metode za
ugotavljanje izhodne moči (IEC 61308:2026)
High-frequency dielectric heating installations - Test methods for the determination of
power output (IEC 61308:2026)
Hochfrequente dielektrische Erwärmungsanlagen - Prüfverfahren für die Bestimmung
der Ausgangsleistung (IEC 61308:2026)
Installations de chauffage diélectrique à haute fréquence - Méthodes d'essai pour la
détermination de la puissance de sortie (IEC 61308:2026)
Ta slovenski standard je istoveten z: EN IEC 61308:2026
ICS:
25.180.10 Električne peči Electric furnaces
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 61308
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2026
ICS 25.180.10 Supersedes EN 61308:2006
English Version
High-frequency dielectric heating installations - Test methods for
the determination of power output
(IEC 61308:2026)
Installations de chauffage diélectrique à haute fréquence - Hochfrequente dielektrische Erwärmungsanlagen -
Méthodes d'essai pour la détermination de la puissance de Prüfverfahren für die Bestimmung der Ausgangsleistung
sortie (IEC 61308:2026)
(IEC 61308:2026)
This European Standard was approved by CENELEC on 2026-09-10. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61308:2026 E
European foreword
The text of document 27/1244/FDIS, future edition 3 of IEC 61308, prepared by TC 27 "Industrial
electroheating and electromagnetic processing" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 61308:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-09-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-09-30
document have to be withdrawn
This document supersedes EN 61308:2006 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61308:2026 was approved by CENELEC as a European
Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-841 - International Electrotechnical Vocabulary - - -
Part 841: Industrial electroheat
IEC 60519-1 - Safety in installations for electroheating EN IEC 60519-1 -
and electromagnetic processing - Part 1:
General requirements
IEC 60519-6 - Safety in installations for electroheating EN IEC 60519-6 -
and electromagnetic processing - Part 6:
Particular requirements for high frequency
dielectric and microwave heating and
processing equipment
IEC 61308 ®
Edition 3.0 2026-08
INTERNATIONAL
STANDARD
High-frequency dielectric heating installations - Test methods for the
determination of power output
ICS 25.180.10 ISBN 978-2-8327-1430-0
IEC 61308:2026-08(en)
IEC 61308:2026 © IEC 2026
CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Test loads . 5
4.1 General . 5
4.2 Calorimetric load . 6
4.3 Lamp load . 6
4.4 Matched resistive load . 6
4.5 Wet-sand load. 6
5 Description of tests . 6
5.1 General . 6
5.2 Calorimetric load method . 6
5.3 Lamp-load temperature method . 9
5.4 Matched resistive load method . 11
5.5 Wet-sand load method . 11
5.6 Evaluation of the output power for high-frequency dielectric plastic welders . 12
5.6.1 General . 12
5.6.2 Test with plastic material . 12
5.7 Evaluation of the output power for type B equipment . 13
Annex A (informative) Recommended test circuit for the lamp-load method . 14
Figure 1 – Example of a calorimeter load . 8
Figure 2 – Example of a short tubular calorimeter load . 9
Figure 3 – Lamp-load circuit . 9
Figure 4 – Example of a lamp load . 10
Figure 5 – Detail of the lamp load . 11
Figure 6 – Plastic welding test electrode . 13
Figure A.1 – Recommended test circuit for the lamp-load method . 14
IEC 61308:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
High-frequency dielectric heating installations -
Test methods for the determination of power output
FOREWORD
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all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61308 has been prepared by IEC technical committee 27: Industrial electroheating and
electromagnetic processing. It is an International Standard.
This third edition cancels and replaces the second edition published in 2005. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) adaptation and alignment to the principles in more recent editions of IEC 60519-1 and
IEC 60519-6;
b) more detailed descriptions of, in particular, the calorimetric load test and output power
evaluation for dielectic plastic welders.
IEC 61308:2026 © IEC 2026
The text of this International Standard is based on the following documents:
Draft Report on voting
27/1244/FDIS 27/1248/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 61308:2026 © IEC 2026
1 Scope
This document specifies test methods for the determination of useful high frequency power
output in equipment for industrial heating and processing of materials. It is in particular
applicable to HF generators made available to users as separate units.
This document is basically applicable to equipment operating in the frequency range 100 kHz
to 300 MHz, as defined in IEC 60519-1, with the following limitations.
– This document does not apply to induction heating, which it is possible to carry out in the
lower part of the specified frequency band.
– The ISM centre frequencies for dielectric heating and processing of industrial interest are
narrow bands about 6,78 MHz, 13,56 MHz, 27,12 MHz and 40,68 MHz.
– This document is not applicable to:
• appliances for household and similar use;
• commercial use;
• laboratory use;
• medical high frequency equipment.
For equipment working in designated ISM bands, it is a legal requirement that the frequency
remains within the ISM bands according to CISPR 11, but the resonant frequency of the circuit
varies with the change of dielectric parameters of the load. Therefore, the value of the mean
output power in the work cycle can be much lower than the value obtained under the test
conditions. This value depends upon the response of the tuning system.
NOTE 1 The following criteria are suitable for determination of the classification as industrial equipment:
– commercial equipment is typically designed and planned for series production of many identical units;
– industrial equipment is typically produced in small series or even as single units; the processed goods are
consumed or ready for final use at the end of the heating process.
NOTE 2 Heating a workload with dielectric parameters which change significantly in time and/or with temperature,
the value of the output power obtained with the actual charge can be different from that obtained with the test load
specified in this document.
This document relates to equipment normally operating under continuous rated
...