1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJuly 20, 20171UL 8203Outline of Investigation for Performance Testing for Ingress of FibrousIndoor DustIssue Number: 1July 20, 2017Summary of TopicsThis First Issue of the Outline of Investigatio
2、n for Performance Testing forIngress of Fibrous Indoor Dust, UL 8203, covers the test program foringress of long-term, airborne and fibrous indoor dust, and its quantifiableanalysis on user experience in terms of the amount of dust ingress,performance benchmarking and noise level. This standard also
3、 provides ascheme for classifying the level of resistance to dust.ULs Outlines of Investigation are copyrighted by UL LLC. Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights
4、regardingthose Outlines of Investigation shall remain the sole and exclusive property of ULLLC.COPYRIGHT 2017 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJULY 20, 2017UL 82032No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED
5、 FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Normative References .43 Glossary .5PERFORMANCE4 General 65 Free Dust Accumulation Test .65.1 Introduction 65.2 Test preparation 75.3 Test procedure .96 Airborne Noise Measurement 116.1 General 116.2 P
6、rocedure for measurement 117 Touch Temperature Measurement .127.1 General 127.2 Procedure for measurement 128 Performance Benchmarking .128.1 General 128.2 Procedure for measurement 129 Dust Mass Concentration Measurement 139.1 General 139.2 Procedure for measurement 13CLASSIFICATION10 Classificatio
7、n of Anti-Dust Protection 1410.1 General .1410.2 Initial assessment 1410.3 Classification 14BIBLIOGRAPHYJULY 20, 2017 UL 8203 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 ScopeThis standard specifies the performance test prog
8、ram for ingress of long-term, airborne and fibrous indoordust, and its quantifiable analysis in terms of the amount of dust ingress, performance benchmarking andnoise level that may have an effect on user experience. This standard also provides a scheme forclassifying the level of resistance to dust
9、.Where no standards exist, use of this standard for other applications is not precluded.2 Normative ReferencesThe following documents, in whole or in part, are normatively referenced in this document and areindispensable for its application. For dated references, only the edition cited applies. For
10、undatedreferences, the latest edition of the referenced document (including any amendments) applies.IEC 60721-3-7:2002, Classification of environmental conditions Part 3-7: Classification of groups ofenvironmental parameters and their severities Portable and non-stationary useIECEE Operational Docum
11、ent No. OD-5011, Requirements for traceability of calibrations and calibrationintervalsIECEE Operational Document No. OD-5012, Laboratory procedure for acceptance, preparation, extensionand use of thermocouplesIECEE Operational Document No. OD-5014, Instrument accuracy limitsISO 7779:2010, Acoustics
12、 Measurement of airborne noise emitted by information technology andtelecommunications equipmentISO 11201:2010, Acoustics Noise emitted by machinery and equipment Determination of emissionsound pressure levels at a work station and at other specified positions in an essentially free field over arefl
13、ecting plane with negligible environmental correctionsUL 62368-1 Audio/video, information and communication technology equipment Part 1: SafetyrequirementsJULY 20, 2017UL 82034UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3 GlossaryFor the p
14、urpose of this Outline the following definitions apply.3.1 ACCESSIBLE PART A part that can be touched by a body part which is represented by one or moreof the test probes in Annex V of IEC 62368-1:2014, as applicable. SOURCE: IEV 442-01-15; IEC62368-1:2014, sub-clause 3.3.6.1, modified3.2 DUST Airbo
15、rne particulate matter of unspecified origin or composition and may involve cotton fibers.3.3 LINEAR AVERAGE AIR VELOCITY The ratio of a volumetric air flow and a cross section.NOTE: It can also be measured by sensing the pressure produced by the movement of air.3.4 NORMAL OPERATING CONDITION Operat
16、ing condition that represents as closely as possible therange of normal use that can reasonably be expected. SOURCE: IEV 903-01-21; IEC 62368-1:2014,sub-clause 3.3.7.4, modified3.5 PERFORMANCE BENCHMARKING A process of measuring the performance of a product, serviceor process against another counter
17、part which generally is chosen to be the best of its kind, also known asbest-in-class.NOTE: In computing, performance benchmarking is to run a suite of tests comprising prescribed testcases, so as to assess the relative performance of an object.3.6 READABILITY (also known as Resolution, Scale Divisi
18、on, Scale Interval, Increment or Digit) Thesmallest change in mass that corresponds to a change in displayed value. In other words, this is theamount that the scale will increment by as weight is added or removed.3.7 SOUND PRESSURE LEVEL Ten times the logarithm to the base 10 of the ratio of the squ
19、are ofthe sound pressure, p, to the square of a reference value of 20 Pa, expressed in decibels (dB).SOURCE: ISO/TR 25417:2007, sub-clause 2.2; ISO 80000-8:2007, sub-clause 8.223.8 TYPE TEST Test on a representative sample with the objective of determining if, as designed andmanufactured, it can mee
20、t the requirements of this standard. SOURCE: IEC 62368-1:2014, sub-clause3.3.6.12JULY 20, 2017 UL 8203 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPERFORMANCE4 GeneralExcept where otherwise stated, tests specified are type tests.Except wh
21、ere specific test conditions are stated elsewhere and where it is clear that there is a significantimpact on the results of the test, the tests shall be conducted under the most unfavorable normaloperating conditions in accordance with manufacturers specification, including, but not limited to: Elec
22、trical (voltage, frequency); Environmental (temperature, humidity, air movement); Computational (CPU, GPU, VPU); Airflow (vent, fan speed, filter); Orientations (standing, mounting); Modes of operation (boost, gaming); and Configuration (hardware, software).NOTE: In order to determine the most unfav
23、orable test conditions, the test may be repeated with differentcombinations.The test conditions under which the most unfavorable results are produced shall be recorded anddocumented.Unless otherwise specified, accuracy, traceability of calibration, and other aspects pertaining tomeasurement of physi
24、cal quantities shall refer to the documents in Section 2, Normative References, asfar as relevant and applicable.5 Free Dust Accumulation Test5.1 IntroductionA low concentration of dust is injected into a dust accumulation chamber at intervals, allowing dust to buildup on surfaces of the device unde
25、r test. The mean dust accumulation rate is set at constant and the linearaverage air velocity is maintained at a negligible level so as not to impede finer dust particles fromaccumulation. The temperature inside the dust deposition chamber is set slightly higher than that of theambient temperature i
26、n order to achieve low relative humidity and reduce the effect of moisture content.JULY 20, 2017UL 82036UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.2 Test preparation5.2.1 Dust accumulation chamberThe test chamber shall fulfill the follo
27、wing characteristics: It shall be large enough so that the linear average air velocity resulting from the fluidpressure of the dust diffusor is negligible.NOTE: A linear average air velocity not exceeding 0.2 m/s is considered negligible. This may beachieved if the dust diffusor is located at a suff
28、icient height. It shall be made so that the test dust will uniformly fall onto the device under test. Theuniformity is to be measured by placing nine suitable sample plates, including one at the centerwhere the device under test is to be placed. The measured mass of dust accumulation on eachsample p
29、late shall be 40 6 g after the test of 5.3.3.NOTE: The test dust mass of 40 g is to simulate the total mass of dust accumulation in asheltered or closed indoor environment for a period of three years in accordance with Class7S1 of IEC 60721-3-7:2002 (dust sedimentation of 1.5 mg/(m2h).Inside the cha
30、mber: The supporting surface on which the test dust is accumulated shall be electrically-conductiveand grounded to reduce the build-up of electrostatic charge. The relative humidity shall not exceed 25%.NOTE: This humidity level may be achieved by raising the chamber air temperature.NOTE: An example
31、 of a test chamber is illustrated in Figure 5 of IEC 60068-2-68:1994.5.2.2 Test dustThe test dust shall be comprised of a homogeneous mixture of: 70% by mass mineral dust, according to the grain size distribution in Table 1.JULY 20, 2017 UL 8203 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER RE
32、PRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 1Grain size distribution of test mineral dustGrain size range (mm) Parts by mass (%)3000Developing 1 S6 T6 P 15 M 3000BIBLIOGRAPHYIEC 60068-2-68:1994, Environmental testing Part 2-68: Tests Test L: Dust and sandIEC 62885-2:2016, Surface clean
33、ing appliances Part 2: Dry vacuum cleaners for household or similaruse Methods for measuring the performanceIEC 60721-2-5:1991, Classification of environmental conditions Part 2: Environmental conditionsappearing in nature Section 5: Dust, sand, salt mistUL 60950-1 Information technology equipment Safety Part 1: General requirementsJULY 20, 2017 UL 8203 15UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJULY 20, 2017UL 820316No Text on This Page
