EN 60705:1999

SLOVENSKI STANDARD
01-februar-2001
Household microwave ovens - Methods for measuring performance
Household microwave ovens - Methods for measuring performance
Mikrowellengeräte für den Hausgebrauch und ähnliche Zwecke - Verfahren zur Messung
der Gebrauchstauglichkeit
Fours micro-ondes à usage domestique - Méthodes de mesure de l'aptitude à la fonction
Ta slovenski standard je istoveten z: EN 60705:1999
ICS:
97.040.20 âWHGLOQLNLGHORYQLSXOWL Cooking ranges, working
SHþLFHLQSRGREQLDSDUDWL tables, ovens and similar
appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Troisième édition
STANDARD
Third edition
1999-04
Fours micro-ondes à usage domestique –
Méthodes de mesure de l'aptitude à la fonction
Household microwave ovens –
Methods for measuring performance
 IEC 1999 Droits de reproduction réservés  Copyright - all rights reserved
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60705 © IEC:1999 – 3 –
CONTENTS
Page
FOREWORD . 5
Clause
1 Scope.7
2 Normative reference.7
3 Definitions.7
4 Classification.9
5 List of measurements . 9
6 General conditions for measurements . 11
7 Dimensions and volume. 13
8 Determination of microwave power output . 15
9 Efficiency.15
10 Technical tests for performance . 17
11 Heating performance.19
12 Cooking performance.21
13 Defrosting performance.31
Annex A (informative) Optional heating tests – batter . 53
Annex B (informative) Regional defrosting tests . 57
Annex C (informative) Bibliography . 63

60705 © IEC:1999 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
HOUSEHOLD MICROWAVE OVENS –
METHODS FOR MEASURING PERFORMANCE
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising with
the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any divergence
between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the
latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60705 has been prepared by subcommittee 59H: Microwave ovens,
of IEC technical committee 59: Performance of household electrical appliances.
This third edition of IEC 60705 cancels and replaces the second edition, issued in 1988, and its
amendments 1 (1993) and 2 (1993); it constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
59H/97/FDIS 59H/98/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
Annexes A, B and C are for information only.
In this standard, the following print types are used:
– test specifications: in italic type
– notes: in small roman type
– other texts: in roman type.
Words in bold in the text are defined in clause 3.
The following differences exist in some countries:
Clause 7: Metric dimensional measures are not in common use (USA).

60705 © IEC:1999 – 7 –
HOUSEHOLD MICROWAVE OVENS –
METHODS FOR MEASURING PERFORMANCE
1 Scope
This International Standard applies to microwave ovens for household use. It also applies to
combination microwave ovens.
This standard defines the main performance characteristics of household microwave ovens
which are of interest to the user and specifies methods for measuring these characteristics.
NOTE 1 – This standard does not deal with:
–  ovens which cannot accept a load having a diameter of ≥200 mm;
*
–  safety requirements (see IEC 60335-2-25 [1] and IEC 60335-2-90 [2]).
NOTE 2 – This standard does not apply to ovens incorporating conventional heating means only (see IEC 60350) [3].
2 Normative references
The following normative document contains provisions which, through reference in this text,
constitute provisions of this International Standard. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this International Standard are encouraged to investigate the possibility
of applying the most recent edition of the normative document indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of IEC
and ISO maintain registers of currently valid International Standards.
CISPR 11:1997, Industrial, scientific and medical (ISM) radio-frequency equipment – Electro-
magnetic disturbance characteristics – Limits and methods of measurement
3 Definitions
For the purpose of this International Standard, the following definitions apply.
3.1
microwave oven
appliance using electromagnetic energy in the ISM frequency band of 2 450 MHz, for heating
food and beverages in the cavity.
NOTE 1 – The microwave oven may incorporate a browning element.
NOTE 2 – ISM frequency bands are the electromagnetic frequencies established by the ITU and reproduced in
CISPR 11.
3.2
combination microwave oven
microwave oven in which the microwave energy is combined with thermal energy
___________
*
Figures in square brackets refer to the bibliography given in annex C.

60705 © IEC:1999 – 9 –
3.3
microwave transparent
property of a material having negligible absorption and reflection of microwaves
NOTE – The relative permittivity of a microwave transparent material is less than 7 and the relative loss factor is less
than 0,015.
3.4
rated voltage
voltage assigned to the appliance by the manufacturer
4 Classification
Appliances are classified according to their type and characteristics.
4.1 According to type
– microwave ovens;
– combination microwave ovens.
The type of oven shall be stated in the report.
4.2 According to characteristics
– usable cavity dimensions;
– with or without a turntable.
The characteristics of the oven shall be stated in the report.
5 List of measurements
Performance is measured by the tests listed in table 1.

60705 © IEC:1999 – 11 –
Table 1 – List of measurements
Item of measurement Clause or Reproducibility Microwave ovens Combination
1)
subclause microwave ovens
External dimensions 7.1 Yes * *
Usable cavity dimensions 7.2 Yes * *
Usable cavity volume 7.3 Yes * *
Microwave power output 8 Yes *
Efficiency 9 Yes *
Square tank 10.1 Yes *
Multiple cup 10.2 Yes *
Heating beverages 11.1 Yes *
Heating simulated food 11.2 Yes *
Egg custard 12.3.1 No *
Sponge cake 12.3.2 No *
Meatloaf 12.3.3 No *
Potato gratin 12.3.4 No *
Cake 12.3.5 No *
Chicken 12.3.6 No *
Meat defrosting 13.3 No *
Batter Annex A No *
* Test is applicable.
1)
Except for the tests of 10.1, these tests are also applicable to combination microwave ovens when operated in
the microwave only mode.
6 General conditions for measurements
Unless otherwise specified, the measurements are made under the following conditions.
6.1 Supply voltage
The appliance is supplied at rated voltage ±1 %. If the appliance has a rated voltage range,
the tests are carried out at the nominal voltage of the country where the appliance is intended
to be used. This voltage is stated in the report.
NOTE – The supply voltage should be essentially sinusoidal. Results of the tests may otherwise be affected.
6.2 Test room
The tests are carried out in a substantially draught-free room in which the ambient temperature
is maintained at 20 °C ± 5 °C.
6.3 Water
Potable water is used for the tests.

60705 © IEC:1999 – 13 –
6.4 Initial condition of the oven
At the beginning of each test,
– the temperatures of the magnetron and the power transformer shall be within 5 K of the
ambient temperature, or
– the oven has not been operated for a period of at least 6 h. However, this period may be
reduced if it can be demonstrated that the microwave power output, as determined in
clause 8, is available earlier.
NOTE – Forced cooling may be used to assist in reducing the oven temperature.
6.5 Control setting
The tests are carried out with the controls set to give the highest power output.
7 Dimensions and volume
7.1 External dimensions
The overall height, width and depth of the appliance, excluding any knobs and handles on the
front surface, are measured. The depth is also measured with the door fully open. The
dimensions are shown in figure 1. If adjustable feet are provided, the height of the appliance is
determined with the feet in their minimum and maximum positions.
The dimensions are stated in millimetres.
7.2 Usable cavity dimensions
The usable cavity dimensions provide information on the space available for food containers.
Significant protrusions such as stirrer covers are taken into account, but not minor details such
as rounded edges.
The usable dimensions are determined as follows:
– usable height, the vertical distance between the major plane of the shelf and the plane of
the ceiling, which is determined by the lowest point within a 100 mm radius from the vertical
centre line of the cavity;
– usable width, the horizontal distance between the major planes of the side walls;
– usable depth, the horizontal distance between the major plane of the inside of the closed
door and the major plane of the rear wall;
– usable diameter, twice the shortest distance from the centre of rotation of the turntable to
the nearest wall or the door.
An example is shown in figure 2.
Dimensions are stated in millimetres.
7.3 Usable volume
The usable volume provides information for classification of cavity sizes.
The usable volume is calculated from the usable height, width and depth measured in 7.2. For
ovens with a turntable, the usable volume is the circular cylinder calculated from the diameter
and height.
The volume is stated in litres, rounded to the nearest litre.

60705 © IEC:1999 – 15 –
8 Determination of microwave power output
The measurement is made with a water load in a glass container. The water temperature is
initially below ambient temper
...