EN 60456:2011

SLOVENSKI STANDARD
01-oktober-2011
Gospodinjski pralni stroji - Metode za merjenje funkcionalnosti (IEC 60456:2010,
spremenjen)
Clothes washing machines for household use - Methods for measuring the performance
(IEC 60456:2010, modified)
Waschmaschinen für den Hausgebrauch - Verfahren zur Messung der
Gebrauchseigenschaften (IEC 60456:2010, modifiziert)
Machines à laver le linge pour usage domestique - Méthodes de mesure de l'aptitude à
la fonction (CEI 60456:2010, modifiée)
Ta slovenski standard je istoveten z: EN 60456:2011
ICS:
97.060 Aparati za nego perila Laundry appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60456
NORME EUROPÉENNE
July 2011
EUROPÄISCHE NORM
ICS 97.060 Supersedes EN 60456:2005 + A11:2006 + A12:2011

English version
Clothes washing machines for household use -
Methods for measuring the performance
(IEC 60456:2010, modified)
Machines à laver le linge pour usage do- Waschmaschinen für den Hausgebrauch -
mestique - Verfahren zur Messung der
Méthodes de mesure de l'aptitude à la Gebrauchseigenschaften
fonction (IEC 60456:2010, modifiziert)
(CEI 60456:2010, modifiée)
This European Standard was approved by CENELEC on 2011-03-21. 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 applica-
tion to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other lan-
guage made by translation under the responsibility of a CENELEC member into its own language and notified to
the Central Secretariat 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, Lat-
via, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60456:2011 E
CONTENTS
Foreword . 7
Endorsement notice . . 8
1 Sc op e . . 9
2 Normative references . 9
3 Terms, definitions and symbols . 9
3.1 Terms and definitions . 9
3.2 Symbols . 14
3.2.1 Symbols relating to Subclause 9.2 – washing performance . 14
3.2.2 Symbols relating to Sublause 9.3 – water extraction (spinning) . 14
3.2.3 Symbols relating to Subclause 9.4 – rinsing performance . 14
3.2.4 Symbols relating to Subclause 9.5 – energy, water and time . 15
3.2.5 Symbols relating to Clause 10 – wool shrinkage . 15
3.2.6 Symbols relating to Annex G . 15
3.2.7 Symbols relating to Annex I . 15
3.2.8 Symbols relating to Annex L . 15
3.2.Z1Symbols relating to Annex ZA . 16
4 Requirements . 21
4.1 General . 21
4.2 Rated capacity . 22
4.3 Dimensions . 22
5 Test conditions, materials, equipment and instrumentation . 23
5.1 General . 23
5.2 Ambient conditions . 23
5.2.1 Electricity supply . 23
5.2.2 Water supply . 23
5.2.3 Ambient temperature and humidity . 25
5.3 Test materials . 25
5.3.1 General . 25
5.3.2 Base loads . 25
5.3.3 Stain test strips . 26
5.3.4 Wool shrinkage specimens . 26
5.3.5 Detergents . 26
5.4 Equipm ent . 27
5.4.1 General . 27
5.4.2 Reference machine . 27
5.4.3 Spectrophotometer . 27
5.4.4 Equipment for conditioning the base load . 28
5.4.5 Standard extractor . 28
5.4.6 Iron for preparation of stain test strips after washing . 29
5.4.7 Titration equipment . 29
5.4.8 Other equipment . 30
5.5 Instrumentation and accuracy . 30
5.5.1 General . 30
5.5.2 Instruments . 30
5.5.3 Me as ur em ents . 31
6 Preparation for testing . 31
6.1 General . 31

– 3 – EN 60456:2011
6.2 Test washing machine and reference machine preparation . 32
6.2.1 Test washing machine . 32
6.2.2 Reference machine . 33
6.3 Detergent . 33
6.3.1 General . 33
6.3.2 De ter g e nt d os e . 33
6.3.3 M ixi n g d et er ge nt . 34
6.3.4 Detergent placement . 34
6.4 Test loads . 35
6.4.1 General . 35
6.4.2 Pre-treatment of new base load items prior to use . 37
6.4.3 Requirements regarding the age of base load items . 38
6.4.4 Normalization of base load items before a new test series . 38
6.4.5 Conditioning of base load items before a new test series . 39
6.4.6 Test load composition . 40
6.4.7 Addition of stain test strips or wool shrinkage specimens to the base
load . 43
7 Performance measurements – general requirements . 44
8 Tests for performance . 46
8.1 General . 46
8.2 Test procedure for performance tests . 46
8.2.1 Test conditions, materials and preparation for testing . 46
8.2.2 Test load and loading . 47
8.2.3 Pr ogr am m e . 47
8.2.4 Test procedure . 47
8.2.5 Test series . 48
8.3 Measurements to determine washing performance . 50
8.3.1 General . 50
8.3.2 Removal and drying of stain test strips . 50
8.3.3 Assessment of stain test strips . 50
8.4 Measurements to determine water extraction performance . 51
8.4.1 General . 51
8.4.2 Washing machines . 51
8.4.3 Spin extractors . 51
8.5 Measurements to determine rinsing performance . 52
8.5.1 General . 52
8.5.2 Spin extraction and sampling . 52
8.5.3 Alkalinity measurements . 53
8.6 Measurements to determine water and energy consumption and programme
tim e . 54
8.6.1 General . 54
8.6.2 Procedure . 54
9 Assessment of performance . 55
9.1 General . 55
9.2 Evaluation of washing performance . 55
9.3 Evaluation of water extraction performance . 57
9.4 Evaluation of rinsing performance . 58
9.4.1 General . 58
9.4.2 Ca lc u la t io ns . 58
9.4.3 Evaluation . 58

9.5 Evaluation of water and energy consumption and programme time . 59
9.5.1 General . 59
9.5.2 Water volumes . 59
9.5.3 Programme time . 60
9.5.4 Energy consumption . 60
10 Shrinkage during the wool wash programme . 61
10.1 General . 61
10.2 Overview . 61
10.2.1 General . 61
10.2.2 Determination of reference shrinkage . 61
10.3 Procedure . 62
10.3.1 Preparation of wool shrinkage specimens . 62
10.3.2 Wool programme test . 64
10.3.3 Evaluation . 65
11 Data to be reported . 66
Annex A (normative) Specification of stain test strips with standardized soiling . 67
Annex B (normative) Reference detergent A* . 71
Annex C (normative) Specifications for base loads . 73
Annex D (normative) Reference machine specification . 76
Annex E (normative) Reference machine programme definitions . 81
Annex F (informative) Reference programmes and examples of comparable washing
machine programmes . 84
Annex G (normative) The bone-dry method of conditioning . 85
Annex H (normative) Folding and loading the test load . 87
Annex I (normative) Calculation of weighted average age of the cotton base load . 104
Annex J (normative) Loading a large standard extractor (rinsing performance) . 106
Annex K (informative) Laboratory internal testing guide . 110
Annex L (normative) (informative) Measurement of energy consumption in low power
modes of washing machines . 115
Annex M (normative) (informative) Testing procedure for manual washing machines . 118
Annex N (normative) (informative)  Procedure to determine test load size where rated
capacity is not declared . 120
Annex O (informative) Additional evaluation of washing performance . 122
Annex P (informative) Testing deviations to reduce costs and their limitations . 126
Annex Q (informative) Uncertainty of measurements in IEC 60456 . 132
Annex R (informative) Environmental aspects of washing machine use determined in
IEC 60456 . 135
Annex S (normative) Test report – data to be reported . 138
Annex T (normative) Wool shrinkage specimens . 145
Annex U (informative) Sources of materials and supplies . 146
Annex ZA (normative) Test procedure for a combined test sequence of cotton 40 °C and
cotton 60 °C with full load and partial load . 14 7
Annex ZB (normative)  Tolerances and control procedures . 189
Annex ZC (normative) Normative references to international publications with their
corresponding European publications . 191
Bibliography . 19 2

– 5 – EN 60456:2011
Figure 1 – Load item preparation prior to a test series . 36
Figure 2 – Load composition and age requirements . 37
Figure 3 – Attached test strip . 44
Figure 4 – Test series: process and decisions for load mass and age . 48
Figure 5 – Positions for measuring soiled test pieces . 50
Figure 6 – Wool shrinkage specimen, uncut . 62
Figure 7 – Wool shrinkage specimen, fraying the edges and V-cuts . 62
Figure 8 – Wool shrinkage specimen, marks . 63
Figure H.1 – Folding towel with a stain test strip attached . 86
Figure H.2 – Folding towel without a stain test strip attached . 87
Figure H.3 – Folding pillowcases . 87
Figure H.4 – Folding bed sheets . 87
Figure H.5 – Folding pillowcases with a stain test strip attached . 88
Figure H.6 – Folding pillowcases without a stain test strip attached . 88
Figure H.7 – Folding shirts . 89
Figure H.8 – Illustration of horizontal axis washing machine . 89
Figure H.9 – Illustration of vertical axis washing machine . 90
Figure H.10 – Horizontal axis washing machine: placement of items in the drum . 91
Figure H.11 – Vertical axis washing machine: placement of items in the drum . 91
Figure H.12 – Horizontal axis washing machine: illustration of alternating orientation . 93
Figure H.13 – Placement of 2 towels with strips in one layer for load sizes larger than 10
kg . 96
Figure H.14 – Vertical axis washing machines, four quadrants (plan view) . 98
Figure I.1 – Example for the exchange of load items for a 5 kg cotton load . 104
Figure J.1 – Example of a large standard extractor . 105
Figure J.2 – View from the top: loading the large standard extractor . 105
Figure J.3 – Areas for loading . 106
Figure J.4 – Folding of items . 106
Figure J.5 – 3 areas of loading . 107
Figure J.6 – Outer circle . 107
Figure J.7 – Outer circle . 107
Figure J.8 – Middle circle . 108
Figure J.9 – Inner circle . 108
Figure J.10 – Towels covering the load . 108

Table 1 – Detergent dose .
Table 2 – Number of items in the cotton test load for various test load masses .
Table 3 – Number of items in the synthetics/blends test load for various test load masses .
Table 4 – Number of items in the wool programme test load for various test load masses .
Table A.1 – Ratios and tolerances of standardized soils, Reference Machine CLS and
MP Lab .
Table B.1 – Composition of the reference detergent A* .
Table C.1 – Specification of the cotton base load items .

Table C.2 – Specification of the synthetics/blends base load items .
Table D.1 – Description of the reference washing machine and method of use type 1 .
Table D.2 – Description of the reference washing machine and method of use type 2 .
Table D.3 – Programmed volume for type 2 reference machine .
Table E.1 – Specification of reference washing programmes.
Table E.2 – Tolerances given for some procedure parameters .
Table F.1 – Reference programmes and examples of comparable washing machine
programmes.
Table H.1 – Vertical axis washing machines, loading sequence example for a
synthetics/blends load .
Table H.2 – Horizontal axis washing machines, loading sequence .
Table H.3 – Horizontal axis washing machine, loading example (5 kg) .
Table H.4 – Vertical axis washing machines, small loads without sheets (1,0 kg to 2,5 kg) .
Table H.5 – Vertical axis washing machines, medium loads with two sheets (3,0 kg to
7,0 kg) .
Table H.6 – Vertical axis washing machines, large loads with three sheets (7,5 kg to
8,5 kg) .
Table H.7 – Vertical axis washing machines, very large loads with four sheets (9,0 kg to
10,0 kg) .
Table H.8 – Vertical axis washing machine – loading example (5 kg) .
Table S.1 – Data for test washing machine .
Table S.2 – Data, parameters and performance results, cotton or synthetics/blends base
loads .
Table S.2a – Data, parameters and results, cotton or synthetics/blends base loads .
Table S.2b – Performance results, cotton or synthetics/blends base loads .
Table S.3 – Data, parameters and results – wool shrinkage – polyester base load .
Table S.4 – Weighted average age – cotton load .
Table S.5 – Materials .
Table S.6 – Equipment .

– 7 – EN 60456:2011
Foreword
The text of the International Standard IEC 60456:2010, prepared by SC 59D, Home laundry ap-
pliances, of IEC TC 59, Performance of household and similar electrical appliances, together
with common modifications prepared by the Technical Committee CENELEC TC 59X, Perform-
ance of household and similar electrical appliances, was submitted to the formal vote and was
approved by CENELEC as EN 60456 on 2011-03-21.
This document supersedes EN 60456:2005 + A11:2006 + A12:2011
Significant technical differences are
a) a test procedure for a combined test sequence of cotton 40 °C and cotton 60 °C with full
load and partial load is introduced,
b) a test procedure for measuring power consumption in low power modes is introduced,
c) a formula to calculate the energy consumption of washing machines including low power
modes is added,
d) the detergent dosage is reduced to 75 % for cotton and synthetic/blends,
e) the detergent dosage of the reference machine type 1 is adjusted to maintain the washing
performance level of the reference machine type 2,
f) the reference machine type 1 is to be used for testing according to Commission Regula-
tions with regard to energy labelling and ecodesign,
g) control procedures for checking measured values in comparison to values declared by the
manufacturer under consideration of permitted tolerances are updated.
The procedures described in this European Standard were modified substantially compared to
EN 60456:2005, e.g. with regard to detergent dosage. Therefore results of tests according to
this standard cannot and shall not be directly compared to results of similar procedures of pre-
vious versions. Also results based on a specific reference programme shall not be compared to
results based on other reference programmes.
This European Standard also specifies, as far as necessary, the test methods which shall be
applied in accordance with the COMMISSION DELEGATED REGULATION (EU) No 1061/2010
implementing Directive 2010/30/EU of the European Parliament and of the Council with regard
to energy labelling of household washing machines and in accordance with the COMMISSION
REGULATION (EU) No 1015/2010 implementing Directive 2009/125/EC of the European Par-
liament and of the Council with regard to ecodesign requirements for household washing ma-
chines.
Clauses, subclauses, notes, tables and figures which are additional to those in IEC 60456:2010
are prefixed “Z”.
Annexes ZA, ZB and ZC have been added by CENELEC.
Annex ZA sets out the procedure to be applied for testing according to Commission Regulations
with regard to energy labelling and ecodesign and provides all necessary links to all relevant
clauses of this European Standard.
Annex ZB provides control procedures for checking measured values in comparison to values
declared by the manufacturer and taking into account any permitted tolerances.
Annex ZC lists normative references.
__________
Endorsement notice
The text of the International Standard IEC 60456:2010 was approved by CENELEC as a Euro-
pean Standard with common modifications printed in red letters.

– 9 – EN 60456:2011
1 Scope
This European Standard specifies methods for measuring the performance of clothes washing
machines for household use, with or without heating devices utilising cold and/or hot water
supply. It also deals with appliances for water extraction by centrifugal force (spin extractors)
and is applicable to appliances for both washing and drying textiles (washer-dryers) with re-
spect to their washing related functions. This European Standard also covers washing ma-
chines which specify the use of no detergent for normal use.
NOTE 1 Tumble dryer performance is assessed to IEC 61121.
The object is to state and define the principal performance characteristics of electric household
washing machines and spin extractors and to describe the test methods for measuring these
characteristics.
NOTE 2 This European standard applies also to washing machines for communal use in blocks of flats or in laun-
derettes. It does not apply to washing machines for commercial laundries. This European Standard is not intended
to be used for the comparative evaluation of detergents.
NOTE 3 This European Standard does not specify acoustical noise requirements for washing machines. Acoustical
noise measurements are specified in IEC 60704-1 and IEC 60704-2-4.
NOTE 4 This European Standard does not specify safety requirements for washing machines. Safety requirements
are specified in IEC 60335-2-7.
2 Normative references
Void.
NOTE Z1: Normative references to the relevant European Standards are listed in Annex ZC (normative).
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following definitions apply.
3.1.1
washing machine
appliance for cleaning and rinsing of textiles using water which may also have a means of ex-
tracting excess water from the textiles
3.1.2
test washing machine
washing machine that is subjected to part or all of the requirements in this document in order
to determine its performance
NOTE Test washing machine may include washing machines according to 3.1.7, 3.1.8, 3.1.9 and/or 3.1.10.
3.1.3
reference machine
specially constructed washing machine of known performance which is used to increase re-
peatability and reproducibility of results
NOTE It may be used to provide a known performance level within a laboratory against which to compare selected
performance parameters on test washing machines as defined in this document – refer 5.4.2.

3.1.4
washer-dryer
washing machine which includes both a spin extraction function and also a means for drying
the textiles, usually by heating and tumbling
NOTE This document only covers the operations which relate to the washing machine function – see Scope.
3.1.5
spin extractor
separate water-extracting appliance in which water is removed from textiles by centrifugal ac-
tion (spin extraction)
3.1.6
standard extractor
spin extractor used to remove water remaining in the base load at the completion of the pro-
gramme where a rinse performance measurement is required
3.1.7
vertical axis washing machine
washing machine in which the load is placed in a drum which rotates around an axis which is
vertical or close to vertical. For the purposes of this document, vertical axis is where the angle
of the axis of rotation is more than 45 degrees to horizontal. Where the drum does not rotate,
the washing machine shall be classified as a vertical axis washing machine.
NOTE The classification of vertical axis or horizontal axis in this document is only used to define the placement of
the load into the drum.
3.1.8
horizontal axis washing machine
washing machine in which the load is placed in a drum which rotates around an axis which is
horizontal or close to horizontal. For the purposes of this document, horizontal axis is where the
angle of the axis is less than or equal to 45 degrees to horizontal.
NOTE The classification of vertical axis or horizontal axis in this document is only used to define the placement of
the load into the drum.
3.1.9
manual washing machine
washing machine where the machine requires user intervention at one or more points during
the programme to enable the machine to proceed to the next operation
NOTE Examples of user intervention could include manual fill (non automatic water level), transfer of the load be-
tween a washing drum and a spin extractor drum or manual draining. Manual washing machines have special re-
quirements regarding the programme which is tested for this document; see Annex M.
3.1.10
automatic machine
washing machine where the load is fully treated by the machine without the need for user in-
tervention at any point during the programme prior to its completion
3.1.11
test run
single performance assessment as specified in Clause 7 of this document
3.1.12
test series
group of test runs on a test washing machine which, collectively, are used to assess the per-
formance of a washing machine
– 11 – EN 60456:2011
3.1.13
operation
each performance of a function that occurs during the washing machine programme such as
pre-wash, washing, rinsing, draining or spinning
3.1.14
programme
series of operations which are pre-defined within the washing machine and which are de-
clared by the manufacturer as suitable for washing certain textile types
3.1.15
cycle
complete washing process, as defined by the programme selected, consisting of a series of
operations (wash, rinse, spin, etc.) and including any operations that occur after the comple-
tion of the programme
NOTE Examples of operations that may occur after the completion of the programme are pumping, monitoring and
anti-creasing (where applicable).
3.1.16
spin extraction
water-extracting function by which water is removed from textiles by centrifugal action. This is
included as a function (built in operation) of an automatic washing machine but may also be
performed in a spin extractor
3.1.17
spin speed
rotational frequency of a drum during spin extraction
NOTE A method for determination of spin speed is not defined in this standard.
3.1.18
base load
textile load used for testing without stain test strips or wool shrinkage specimens
3.1.19
test load
base load used for testing plus stain test strips or wool shrinkage specimens
3.1.20
test load mass
actual mass of the base load plus stain test strips or wool specimen
3.1.21
nominal test load mass
mass of dry textiles of a particular type for which the performance of the test washing machine
shall be tested (rated capacity or part load). Target value for the conditioned test load mass
3.1.22
rated capacity
maximum mass in kg of dry textiles of a particular type which the manufacturer declares can be
treated in the washing machine on the programme selected
3.1.23
programme time
programme time is the time from the initiation of the programme (excluding any user pro-
grammed delay) until the completion of the programme. If the end of programme is not indi-
cated, the programme time is equal to the cycle time.

3.1.24
end of programme
the programme is complete when the washing machine indicates the end of the programme
and the load is accessible to the user. Where there is no end of programme indicator and the
door is locked during operation, the programme is complete when the load is accessible to the
user. Where there is no end of programme indicator and the door is not locked during opera-
tion, the programme is complete when the power consumption of the appliance drops to some
steady state condition and is not performing any function
NOTE An indication of the end of the programme may be in the form of a light (on or off), a sound, an indicator
shown on a display or the release of a door or latch. In some washing machines there may be a short delay from an
end of programme indicator until the load is accessible by the user.
3.1.25
cycle time
time from the initiation of the programme (excluding any user programmed delay) until all activ-
ity ceases. Activity is considered to have ceased when the power consumption reverts to a
steady state condition that persists indefinitely without user intervention. If there is no activity
after the end of the programme, the cycle time is equal to the programme time
NOTE Cycle time includes any activity that may occur after the programme is completed. This could include any
electronic activity or any additional mechanical activity that occurs for a limited period after any end of programme
indicator. Any cyclic event that occurs indefinitely is considered to be steady state.
3.1.26
main wash duration
time from the commencement of the initial water intake for the main wash until the commence-
ment of the initial water intake for the first rinse
NOTE Variations in the laboratory water supply pressure may affect the main wash duration. This definition is only
applicable to test washing machines. The reference machine wash time used for calibration of the reference ma-
chine is defined differently. Refer to Table E.1.
3.1.27
remaining moisture content
measure for the additional amount of moisture that is contained in the base load in relation to
the equilibrium condition for base load items which have been conditioned in a controlled
space (refer to 6.4.5.2)
NOTE This equilibrium condition is defined as 0 % remaining moisture content in this document. Hence it is pos-
sible for a base load or load items to have a negative remaining moisture content when treated with a tumble drier.
Refer also to Annex G.
3.1.28
off mode
condition where the product is switched off using appliance controls or switches that are ac-
cessible and intended for operation by the user during normal use to attain the lowest power
consumption that may persist for an indefinite time while connected to a mains power source
and used in accordance with the manufacturer’s instructions. Where there are no controls, the
washing machine is left to revert to a steady state power consumption of its own accord
3.1.29
left on mode
lowest power consumption mode that may persist for an indefinite time after the completion of
the programme and unloading of the machine without any further intervention of the user
NOTE In some products this mode may be an equivalent power to off mode.
3.1.30
rated voltage
voltage assigned to the appliance by the manufacturer

– 13 – EN 60456:2011
3.1.Z1
full load
test load to be used for a combined test series according to Annex ZA, having a nominal mass
that is equal to the greatest amount of cotton textiles that may be washed using the standard
60 °C cotton programme or the standard 40 °C cotton programme, as stated by the manufac-
turer in the instruction manual or on the energy label supplied with the test washing machine,
whichever is higher
3.1.Z2
partial load
half of the full load for cotton textiles
3.1.Z3
treatment
combination of test load and programme to be used for a test run within a combined test se-
ries
3.1.Z4
treatment 60½
standard 60 °C cotton programme with partial load
3.1.Z5
treatment 40½
standard 40 °C cotton programme with partial load
3.1.Z6
treatment 60
standard 60 °C cotton programme with full load
3.1.Z7
unstable left on mode
condition after opening the door, at the end of the programme where the power consumption
may change without any intervention by the end-user
3.1.Z8
post programme phases
phases after the end of programme defined to be used for the measurement of left on mode
3.1.Z9
post programme phase LU
phase after the end of programme defined to be used for the measurement of the unstable left
on mode
3.1.Z10
post programme phase LO
phase after the end of programme defined to be used for the measurement of the left on mode
3.1.Z11
left on mode duration
time to revert automatically the machine to off mode after the end of the programme if the test
washing machine is equipped with a power management system
3.1.Z12
power management system
system within the test washing machine which reverts it automatically to off mode

3.2 Symbols
3.2.1 Symbols relating to Subclause 9.2 – washing performance
C the sum of the average reflectance values (Y-values) for each test run
k
the average sum of the reflectance values (Y-values) for each of the five types of
C
soils, for all valid test runs
C the sum of the reflectance values in each test run of the test washing machine
k
test
the average sum of the reflectance values of the test washing machine
C
test
the average sum of the reflectance values in each test run of the reference ma-
C
ref
chine
m the number of soil types per stain test strip
n the number of stain test strips in each test run
p confidence interval for q
_ _
q ratio between the test washing machine, C , and the reference machine, C
test ref
standard deviation of the ratio q
s
q
s the standard deviation of C
C k
s the standard deviation of the r
...