ASTM F2756-11(2023)
(Test Method)Standard Test Method for Determining Energy Consumption of Vacuum Cleaners
Standard Test Method for Determining Energy Consumption of Vacuum Cleaners
SIGNIFICANCE AND USE
4.1 This test method provides an indication of the amount of energy usage of the vacuum cleaner while operating over a specified cleaning area at a specified stroke speed and total number of cleaning strokes.
4.1.1 The test area is divided into a number of strips, the strip being defined as the width of the power head or nozzle. For the purpose of this procedure, the cleaning area is specified as 10 m2 (15 500 in.2), the stroke speed is defined as 0.5 m/s ± 0.03 m/s (1.7 ft/s ± 0.1 ft/s), with a total of 10 strokes per strip.
4.2 In order to provide a uniform basis for measuring the performance described in 1.1, standardized test carpets are employed in this procedure.
SCOPE
1.1 This test method covers only a laboratory test for determining the energy usage-of household and commercial upright, canister, stick, and wet/dry vacuum cleaners operating on carpet when tested under specified conditions.
1.1.1 This procedure may be used in conjunction with other performance criteria, such as cleaning effectiveness.
1.1.2 Vacuum cleaners, other than upright vacuum cleaners, that provide a carpet-cleaning function are tested in accordance with the carpet-cleaning instructions provided in the manufacturer’s instruction manual. If the manufacturer’s instruction manual does not contain instructions for a carpet-cleaning function, the vacuum cleaner is not within the scope of this procedure.
1.2 This test method is applicable to household and commercial types of vacuum cleaners.
1.3 The values stated in SI units are to be regarded as standard. The inch-pound units given in parentheses are mathematical conversions that are provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F2756 − 11 (Reapproved 2023)
Standard Test Method for
Determining Energy Consumption of Vacuum Cleaners
This standard is issued under the fixed designation F2756; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This test method covers only a laboratory test for 2.1 ASTM Standards:
determining the energy usage-of household and commercial F655 Specification for Test Carpets and Pads for Vacuum
upright, canister, stick, and wet/dry vacuum cleaners operating Cleaner Testing (Withdrawn 2022)
on carpet when tested under specified conditions. 2.2 Other Standards:
1.1.1 This procedure may be used in conjunction with other IEC 60312 Vacuum cleaners for household use - Methods of
performance criteria, such as cleaning effectiveness. measuring the performance, Fourth Edition
1.1.2 Vacuum cleaners, other than upright vacuum cleaners, UL 1017 Vacuum Cleaners, Blower Cleaners, and House-
that provide a carpet-cleaning function are tested in accordance hold Floor Finishing Machines
with the carpet-cleaning instructions provided in the manufac-
3. Terminology
turer’s instruction manual. If the manufacturer’s instruction
3.1 Definitions:
manual does not contain instructions for a carpet-cleaning
3.1.1 energy usage, n—amount of electrical energy con-
function, the vacuum cleaner is not within the scope of this
sumed by a vacuum cleaner during cleaning, measured in
procedure.
Joules (Watt-seconds). There are 3600 watt-seconds in one
1.2 This test method is applicable to household and com-
watt-hour.
mercial types of vacuum cleaners.
3.1.2 model, n—designation of a group of vacuum cleaners
1.3 The values stated in SI units are to be regarded as
having identical mechanical and electrical construction with
standard. The inch-pound units given in parentheses are
only cosmetic or nonfunctional differences.
mathematical conversions that are provided for information
3.1.3 population, n—total of all units of a particular model
only and are not considered standard.
vacuum cleaner being tested.
1.4 This standard does not purport to address all of the
3.1.4 repeatability limit, r, n—value below which the abso-
safety concerns, if any, associated with its use. It is the
lute difference between two individual test results obtained
responsibility of the user of this standard to establish appro-
under repeatability condition may be expected to occur with a
priate safety, health, and environmental practices and deter-
probability of approximately 0.95 (95 %).
mine the applicability of regulatory limitations prior to use.
3.1.5 repeatability standard deviation, Sr, n—standard de-
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard- viation of test results obtained under repeatability conditions.
ization established in the Decision on Principles for the
3.1.6 reproducibility limit, R, n—value below which the
Development of International Standards, Guides and Recom-
absolute difference between two test results obtained under
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1 3
This test method is under the jurisdiction of ASTM Committee F11 on Vacuum The last approved version of this historical standard is referenced on
Cleaners and is the direct responsibility of Subcommittee F11.20 on Performance www.astm.org.
(Test Methods). Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Current edition approved Sept. 1, 2023. Published September 2023. Originally 4th Floor, New York, NY 10036, http://www.ansi.org.
approved in 2009. Last previous edition approved in 2016 as F2756 – 11 (2016). Available from Underwriters Laboratories (UL), 333 Pfingsten Rd.,
DOI: 10.1520/F2756-11R23. Northbrook, IL 60062-2096, http://www.ul.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2756 − 11 (2023)
reproducibility conditions may be expected to occur with a 5.6 Temperature and Humidity Indicators, to provide tem-
probability of approximately 0.95 (95 %). perature measurements accurate to within 6 ⁄2 °C (61 °F) and
humidity measurements accurate to within 3 % relative humid-
3.1.7 reproducibility standard deviation, SR, n—standard
ity.
deviation of test results obtained under reproducibility condi-
5.7 Supporting Surface—A flat surface consisting of a piece
tions.
of 19-mm ( ⁄4-in.) thick exterior grade plywood with the “A”
3.1.8 sample, n—group of vacuum cleaners taken from a
surface upward to support the test carpet and pad. If necessary,
large collection of vacuum cleaners of one particular model
the four corners (only) of the test carpet and pad may be
which serves to provide information that may be used as a basis
fastened to the supporting surface by any acceptable means.
for making a decision concerning the larger collection.
3.1.9 strip, n—width covered during one stroke, defined by 6. Materials
the extreme outside geometric width of the power head or
6.1 Standard level loop or Wilton carpet conforming to
nozzle.
Specification F655.
3.1.10 test run, n—definitive procedure that produces a
6.2 Standard carpet padding conforming to Specification
singular measured result.
F655.
3.1.11 unit, n—single vacuum cleaner of the model being
7. Sampling
tested.
7.1 A minimum of three units of the same model vacuum
3.1.12 watt-hour meter, n—meter that measures and regis-
cleaner selected at random in accordance with good statistical
ters the integral, with respect to time, of the active power of the
practice shall constitute the population sample.
circuit in which it is connected; the unit of measurement is
7.1.1 To determine the best estimate of energy usage asso-
usually the kilowatt-hour.
ciated with the population of the vacuum cleaner model being
tested, the arithmetic mean of the energy consumed by the
4. Significance and Use
sample from the population shall be established by testing it to
4.1 This test method provides an indication of the amount of
a 90 % confidence level within 65 % of the mean value of the
energy usage of the vacuum cleaner while operating over a
energy usage rating.
specified cleaning area at a specified stroke speed and total
number of cleaning strokes.
8. Conditioning
4.1.1 The test area is divided into a number of strips, the
8.1 Test Room—Maintain the test room in which all condi-
strip being defined as the width of the power head or nozzle.
tioning and vacuum cleaner testing is performed at 21 °C 6
For the purpose of this procedure, the cleaning area is specified
3 °C (70 °F 6 5 °F) and 45 % to 55 % relative humidity.
2 2
as 10 m (15 500 in. ), the stroke speed is defined as 0.5 m ⁄s 6
8.2 All components involved in the test shall remain and be
0.03 m ⁄s (1.7 ft ⁄s 6 0.1 ft ⁄s), with a total of 10 strokes per
exposed in the controlled environment for at least 16 h prior to
strip.
the start of the test.
4.2 In order to provide a uniform basis for measuring the
performance described in 1.1, standardized test carpets are
9. Procedure
employed in this procedure.
9.1 Test Procedure:
9.1.1 The energy consumed by the sample vacuum cleaner
5. Apparatus
shall be established as follows:
9.1.1.1 New test carpets and padding shall be level loop or
5.1 Stopwatch, with a second hand or other type of equip-
Wilton conforming to Specification F655.
ment capable of establishing the specified rate of movement
9.1.1.2 Supporting surface conforming to 5.7.
and total cycle time.
9.1.1.3 Replace the carpet and padding when it has holes,
5.2 Voltmeter, to measure input volts to the vacuum cleaner,
tears, or other signs of wear.
to provide measurements accura
...
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F2756 − 11 (Reapproved 2023)
Standard Test Method for
Determining Energy Consumption of Vacuum Cleaners
This standard is issued under the fixed designation F2756; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2.1 ASTM Standards:
1.1 This test method covers only a laboratory test for
determining the energy usage-of household and commercial F655 Specification for Test Carpets and Pads for Vacuum
Cleaner Testing (Withdrawn 2022)
upright, canister, stick, and wet/dry vacuum cleaners operating
on carpet when tested under specified conditions. 2.2 Other Standards:
IEC 60312 Vacuum cleaners for household use - Methods of
1.1.1 This procedure may be used in conjunction with other
performance criteria, such as cleaning effectiveness. measuring the performance, Fourth Edition
UL 1017 Vacuum Cleaners, Blower Cleaners, and House-
1.1.2 Vacuum cleaners, other than upright vacuum cleaners,
that provide a carpet-cleaning function are tested in accordance hold Floor Finishing Machines
with the carpet-cleaning instructions provided in the manufac-
3. Terminology
turer’s instruction manual. If the manufacturer’s instruction
3.1 Definitions:
manual does not contain instructions for a carpet-cleaning
3.1.1 energy usage, n—amount of electrical energy con-
function, the vacuum cleaner is not within the scope of this
sumed by a vacuum cleaner during cleaning, measured in
procedure.
Joules (Watt-seconds). There are 3600 watt-seconds in one
1.2 This test method is applicable to household and com-
watt-hour.
mercial types of vacuum cleaners.
3.1.2 model, n—designation of a group of vacuum cleaners
1.3 The values stated in SI units are to be regarded as
having identical mechanical and electrical construction with
standard. The inch-pound units given in parentheses are
only cosmetic or nonfunctional differences.
mathematical conversions that are provided for information
3.1.3 population, n—total of all units of a particular model
only and are not considered standard.
vacuum cleaner being tested.
1.4 This standard does not purport to address all of the
3.1.4 repeatability limit, r, n—value below which the abso-
safety concerns, if any, associated with its use. It is the
lute difference between two individual test results obtained
responsibility of the user of this standard to establish appro-
under repeatability condition may be expected to occur with a
priate safety, health, and environmental practices and deter-
probability of approximately 0.95 (95 %).
mine the applicability of regulatory limitations prior to use.
3.1.5 repeatability standard deviation, Sr, n—standard de-
1.5 This international standard was developed in accor-
viation of test results obtained under repeatability conditions.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the 3.1.6 reproducibility limit, R, n—value below which the
absolute difference between two test results obtained under
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Barriers to Trade (TBT) Committee.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1 3
This test method is under the jurisdiction of ASTM Committee F11 on Vacuum The last approved version of this historical standard is referenced on
Cleaners and is the direct responsibility of Subcommittee F11.20 on Performance www.astm.org.
(Test Methods). Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Current edition approved Sept. 1, 2023. Published September 2023. Originally 4th Floor, New York, NY 10036, http://www.ansi.org.
approved in 2009. Last previous edition approved in 2016 as F2756 – 11 (2016). Available from Underwriters Laboratories (UL), 333 Pfingsten Rd.,
DOI: 10.1520/F2756-11R23. Northbrook, IL 60062-2096, http://www.ul.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2756 − 11 (2023)
reproducibility conditions may be expected to occur with a 5.6 Temperature and Humidity Indicators, to provide tem-
probability of approximately 0.95 (95 %). perature measurements accurate to within 6 ⁄2 °C (61 °F) and
humidity measurements accurate to within 3 % relative humid-
3.1.7 reproducibility standard deviation, SR, n—standard
ity.
deviation of test results obtained under reproducibility condi-
tions. 5.7 Supporting Surface—A flat surface consisting of a piece
of 19-mm ( ⁄4-in.) thick exterior grade plywood with the “A”
3.1.8 sample, n—group of vacuum cleaners taken from a
surface upward to support the test carpet and pad. If necessary,
large collection of vacuum cleaners of one particular model
the four corners (only) of the test carpet and pad may be
which serves to provide information that may be used as a basis
fastened to the supporting surface by any acceptable means.
for making a decision concerning the larger collection.
3.1.9 strip, n—width covered during one stroke, defined by
6. Materials
the extreme outside geometric width of the power head or
6.1 Standard level loop or Wilton carpet conforming to
nozzle.
Specification F655.
3.1.10 test run, n—definitive procedure that produces a
6.2 Standard carpet padding conforming to Specification
singular measured result.
F655.
3.1.11 unit, n—single vacuum cleaner of the model being
7. Sampling
tested.
7.1 A minimum of three units of the same model vacuum
3.1.12 watt-hour meter, n—meter that measures and regis-
cleaner selected at random in accordance with good statistical
ters the integral, with respect to time, of the active power of the
practice shall constitute the population sample.
circuit in which it is connected; the unit of measurement is
7.1.1 To determine the best estimate of energy usage asso-
usually the kilowatt-hour.
ciated with the population of the vacuum cleaner model being
tested, the arithmetic mean of the energy consumed by the
4. Significance and Use
sample from the population shall be established by testing it to
4.1 This test method provides an indication of the amount of
a 90 % confidence level within 65 % of the mean value of the
energy usage of the vacuum cleaner while operating over a
energy usage rating.
specified cleaning area at a specified stroke speed and total
number of cleaning strokes.
8. Conditioning
4.1.1 The test area is divided into a number of strips, the
8.1 Test Room—Maintain the test room in which all condi-
strip being defined as the width of the power head or nozzle.
tioning and vacuum cleaner testing is performed at 21 °C 6
For the purpose of this procedure, the cleaning area is specified
3 °C (70 °F 6 5 °F) and 45 % to 55 % relative humidity.
2 2
as 10 m (15 500 in. ), the stroke speed is defined as 0.5 m ⁄s 6
8.2 All components involved in the test shall remain and be
0.03 m ⁄s (1.7 ft ⁄s 6 0.1 ft ⁄s), with a total of 10 strokes per
exposed in the controlled environment for at least 16 h prior to
strip.
the start of the test.
4.2 In order to provide a uniform basis for measuring the
performance described in 1.1, standardized test carpets are
9. Procedure
employed in this procedure.
9.1 Test Procedure:
9.1.1 The energy consumed by the sample vacuum cleaner
5. Apparatus
shall be established as follows:
9.1.1.1 New test carpets and padding shall be level loop or
5.1 Stopwatch, with a second hand or other type of equip-
Wilton conforming to Specification F655.
ment capable of establishing the specified rate of movement
9.1.1.2 Supporting surface conforming to 5.7.
and total cycle time.
9.1.1.3 Replace the carpet and padding when it has holes,
5.2 Voltmeter, to measure input volts to the vacuum cleaner,
tears, or other signs of wear.
to provide measurements accurate to within 61 %.
9.1.1.4 Speed shall be 0.5 m ⁄s 6 0.03 m/s (1.7 ft ⁄s 6
0.1
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F2756 − 11 (Reapproved 2016) F2756 − 11 (Reapproved 2023)
Standard Test Method for
Determining Energy Consumption of Vacuum Cleaners
This standard is issued under the fixed designation F2756; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers only a laboratory test for determining the energy usage-of household and commercial upright, canister,
stick, and wet/dry vacuum cleaners operating on carpet when tested under specified conditions.
1.1.1 This procedure may be used in conjunction with other performance criteria, such as cleaning effectiveness.
1.1.2 Vacuum cleaners, other than upright vacuum cleaners, that provide a carpet-cleaning function are tested in accordance with
the carpet-cleaning instructions provided in the manufacturer’s instruction manual. If the manufacturer’s instruction manual does
not contain instructions for a carpet-cleaning function, the vacuum cleaner is not within the scope of this procedure.
1.2 This test method is applicable to household and commercial types of vacuum cleaners.
1.3 The values stated in SI units are to be regarded as standard. The inch-pound units given in parentheses are mathematical
conversions that are provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
F655 Specification for Test Carpets and Pads for Vacuum Cleaner Testing (Withdrawn 2022)
2.2 Other Standards:
IEC 60312 Vacuum cleaners for household use - Methods of measuring the performance, Fourth Edition
UL 1017 Vacuum Cleaners, Blower Cleaners, and Household Floor Finishing Machines
This test method is under the jurisdiction of ASTM Committee F11 on Vacuum Cleaners and is the direct responsibility of Subcommittee F11.20 on Performance (Test
Methods).
Current edition approved Oct. 1, 2016Sept. 1, 2023. Published October 2016September 2023. Originally approved in 2009. Last previous edition approved in 20112016
as F2756 – 11.F2756 – 11 (2016). DOI: 10.1520/F2756-11R16.10.1520/F2756-11R23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
The last approved version of this historical standard is referenced on www.astm.org.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Available from Underwriters Laboratories (UL), 333 Pfingsten Rd., Northbrook, IL 60062-2096, http://www.ul.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2756 − 11 (2023)
3. Terminology
3.1 Definitions:
3.1.1 energy usage, n—amount of electrical energy consumed by a vacuum cleaner during cleaning, measured in Joules
(Watt-seconds). There are 3600 watt-seconds in one watt-hour.
3.1.2 model, n—designation of a group of vacuum cleaners having identical mechanical and electrical construction with only
cosmetic or nonfunctional differences.
3.1.3 population, n—total of all units of a particular model vacuum cleaner being tested.
3.1.4 repeatability limit, r, n—value below which the absolute difference between two individual test results obtained under
repeatability condition may be expected to occur with a probability of approximately 0.95 (95 %).
3.1.5 repeatability standard deviation, Sr, n—standard deviation of test results obtained under repeatability conditions.
3.1.6 reproducibility limit, R, n—value below which the absolute difference between two test results obtained under reproducibility
conditions may be expected to occur with a probability of approximately 0.95 (95 %).
3.1.7 reproducibility standard deviation, SR, n—standard deviation of test results obtained under reproducibility conditions.
3.1.8 sample, n—group of vacuum cleaners taken from a large collection of vacuum cleaners of one particular model which serves
to provide information that may be used as a basis for making a decision concerning the larger collection.
3.1.9 strip, n—width covered during one stroke, defined by the extreme outside geometric width of the power head or nozzle.
3.1.10 test run, n—definitive procedure that produces a singular measured result.
3.1.11 unit, n—single vacuum cleaner of the model being tested.
3.1.12 watt-hour meter, n—meter that measures and registers the integral, with respect to time, of the active power of the circuit
in which it is connected; the unit of measurement is usually the kilowatt-hour.
4. Significance and Use
4.1 This test method provides an indication of the amount of energy usage of the vacuum cleaner while operating over a specified
cleaning area at a specified stroke speed and total number of cleaning strokes.
4.1.1 The test area is divided into a number of strips, the strip being defined as the width of the power head or nozzle. For the
2 2
purpose of this procedure, the cleaning area is specified as 10 m (15 500 in. ), the stroke speed is defined as 0.50.5 m ⁄s 6 0.03 m ⁄s
(1.7(1.7 ft ⁄s 6 0.1 ft ⁄s), with a total of 10 strokes per strip.
4.2 In order to provide a uniform basis for measuring the performance described in 1.1, standardized test carpets are employed
in this procedure.
5. Apparatus
5.1 Stopwatch, with a second hand or other type of equipment capable of establishing the specified rate of movement and total
cycle time.
5.2 Voltmeter, to measure input volts to the vacuum cleaner, to provide measurements accurate to within 61 %.
5.3 Wattmeter, to measure input watts to the vacuum cleaner, to provide measurements accurate to within 61 %.
F2756 − 11 (2023)
5.4 Voltage-Regulator System, to control the input voltage to the vacuum cleaner. The regulator shall be capable of maintaining
the vacuum cleaner’s rated voltage 61 % and rated frequency having a wave form that is essentially sinusoidal with 3 % maximum
harmonic distortion for the duration of the test.
5.5 Data-Acquisition System, controlled in such a way that, depending on the movement of the agitator nozzle, at least 10 power
measurements are recorded during each stroke.
5.6 Temperature and Humidity Indicators, to provide temperature measurements accurate to within 6 ⁄2 °C (61°F) °C (61 °F)
and humidity measurements accurate to within 3 % relative humidity.
5.7 Supporting Surface—A flat surface consisting of a piece of 19-mm ( ⁄4-in.) thick exterior grade plywood with the “A” surface
upward to support the test carpet and pad. If necessary, the four corners (only) of the test carpet and pad may be fastened to the
supporting surface by any acceptable means.
6. Materials
6.1 Standard level loop or Wilton carpet conforming to Specification F655.
6.2 Standard carpet padding conforming to Specification F655.
7. Sampling
7.1 A minimum of three units of the same model vacuum cleaner selected at random in accordance with good statistical practice
shall constitute the population sample.
7.1.1 To determine the best estimate of energy usage associated with the population of the vacuum cleaner model being tested,
the arithmetic mean of the energy consumed by the sample from the population shall be established by testing it to a 90 %
confidence level within 65 % of the mean value of the energy usage rat
...
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