1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C78.1450-1983 (R2002)Electric Lamps - Incandescent Projection Lamps - Method for Life TestingNOTICE AND DISCLAIMERThe information in this publication was considered technically sound by the consensus of persons engaged in th
2、e development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document.The National Electrical Manufacturers Association (NEMA) standards and guideline publica
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11、 statement.J ANSI C78*L450 83 8 072LiL50 0005373 4 A-13-07 ANSI C78.1450-1983 a Revision of ANSI C78.1450-1982 American National Standard for electric lamps - incandescent projection lamps - method for life testing Approved July 1, 1983 Secretariat: National Electrical Manufacturers Association Page
12、 1 of 2 pages 1. Scope 1.1 This standard describes a method for life testing incandescent projection lamps. It also defmes associ- ated terms and describes a method ofevaluating accept- ability. 1.2 The life test method specified is primarily for use by lamp manufacturers but can be used by any qual
13、i- fied testing laboratory provided all the test require- ments are met. 1.3 This standard is not intended to cover life testing 0 o co 51 c m 00 G of lamps in projection equipment, although it can be used as a guide for such testing. It shall be the responsi- bility of the projection equipment manu
14、facturer to en- sure that use conditions of the lamp meet respective lamp conditions as specified by the lamp manufacturer. 2. Definitions 2.1 Lamp Life. The accumulated time in hours that the filament will light. Failure of the filament to light for any cause other than mechanical shock is consider
15、ed the end of life. 2.2 Rated Life. A declared value assigned by the lamp manufacturer, 2.3 Average Life, The statistical average life of a spe- cific sampling of lamps as determined by means of a life test run in accordance with this standard. 2.4 Early Failures. Lamps that burn five minutes or les
16、s. SucR lamps shall be excluded from the average life calcula tion. 2.5 Acceptable Life. Acceptable life is a computed value based on rated life and sample size. 3. Test Conditions 3.1 Lamp Test Fixture lampholder for the lamp being tested. sentially free of ali vibration. of burning positions speci
17、fied by the lamp manufac- turer. in conjunction with functional devices that affect fila- ment life, such as reimaging back mirrors, shall incor- porate those devices. 3.1.5 The fixture shall be equippedwith a voltage regulator, cooling system, and cycle timer such that the conditions stated in 3.2,
18、3.3, and 3.4 are met. means shall be used to operate an accumulated time 3.1.1 The lamp test furture shall have a suitable 3.1.2 The fixture shall be physically stable and es- 3.1.3 The lamp shall be operated within the range 3.1.4 Fixtures for testing lamps designed to operate 3.1.6 A photocell, cu
19、rrent-sensing device, or other An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National S
20、tan- dard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review and users are cautioned to
21、 obtain the latest editions. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an AmericanNationd Standard in
22、the name of the American National Standards Institute. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five y
23、ears from the date of ap- proval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American Na- tional Standards Institute. Copyright 01983 by American National Standards Institute, 1430 Broadway, New York, N.Y. 10018 r., ANSI3C1183
24、13 ANSI C78-2450 83 H 0724250 0005374 b W Page 2 of 2 pages device for recording the time that a lamp is burning. 3.2 Voltage 3.2.1 Unless otherwise specified, lamps shall be operated at rated alternating current voltage f. 0.5%. Voltage shall be measured with a true rms voltmeter as close to the la
25、mp base terminals as is practical. 3.2.2 Lamps which are designed for special power requirements, such as soft turn-on, direct current, and nonsinusoidal alternating current shall be tested at the voltage conditions specified for those lamps. 3.3 Lamp Cooling. During normal use, natural heating up a
26、nd cooling down may have an effect on the life of an individual lamp. Therefore, to simulate normal use, lamp cooling during the ON-OFF duty cycle specified in 3.4 shall be such that: (1) The lamp base and seal temperatures during the ON time of the duty cycle do not exceed the maximum temperatures
27、specified by the lamp manufacturer (2) The bulb temperature during the ON time of the duty cycle does not exceed the maximum tempera- ture or fall below the minimum temperature specified by the lamp manufacturer (3) All components of the lamp cool down to or near room temperature during the OFF time
28、 of the duty cycle. 3.4 Test Cycle shall be tested with a 60-minute or less ON-OFF duty cycle, with 30 minutes as the maximum ON time. 3.4.2 Lamps having a rated life of more than 200 hours shall be tested with a 24-hour or less (but greater than 60 minutes) ON-OFF duty cycle, with 12 hours as the m
29、aximum ON time. cycles: 3.4.1 Lamps having a rated life of 200 hours or less 3.4.3 The following are examples of ON-OFF duty Rated Life of Lamp (Hours) (1) 200 or less Examples of Duty Cycles (a) 15 minutes ON-5 minutes OFF (b) 15 minutes ON-1 5 minutes OFF (c) 30 minutes ON-30 minutes OFF (a) 11 ho
30、urs ON-1 hour OFF (b) 12 hours ON-12 hours OFF (2) More than 200 3.4.4 Lamps designed for special burning cycles, such as continuous burning or very short (flashing) cycles, shall be tested accordingly. The special burning cycle shall be reported in the test documentation. 4. Test Procedure 4.1 A sa
31、mple of lamps shall be cycled in lamp fixtures under the conditions stated in Section 3 until the end of life as defined in 2.1. 4.2 The average life of a given sample of lamps shall be calculated as follows: x=A/B . where : x= average life of a given sample of lamps, in hours A = total accumulated
32、hours of ON time for all the B = number of lamps in the sample lamps in the sample 5. Acceptability 5.1 The lower limit of acceptable life of a given sample of lamps shall be calculated as follows: Y=CD where : Y = lower limit of acceptable life of a given sample C= rated life of lamps in the sample
33、, in hours D = lowest percentage of rated life, froin Table 1 5.2 In order to be acceptable, the average life of a given sample of lamps shall be not less than the lower limit of acceptable life as calculated in accordance with 5.1. EXAMPLE: A sample consisting of six lamps, each having a rated life
34、 of 50 hours, is tested, and the total number of hours of ON time for the six lamps is 222 hours. The average life of this sample = 22216 = 37 hours. The lower limit of acceptable life will be 50 X 69% = 34.5 hours. This sample is acceptable because the average life (37 hours) is not less than the l
35、ower limit of acceptable life (34.5 hours). Table 1 Samde Size versus Percentage of Rated Life of lamps, in hours Number of Lamps Lowest Percentage of in Sample Rated Life 250 and over 95 249-100 92 99-55 90 54-45 89 44-35 87 34-30 86 29-25 85 24-20 83 19-18 82 17-16 81 15-14 80 13-12 78 11 71 10 76
36、 9 I5 8 73 7 12 6 69 5 66 NOTE: Table 1 is taken from Federal Specification WL-126a Amendment-1, dated August 17, 1961, TABLE III - Life Tolerance. ANSI C78.1450-1983 / NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION 1300 NORTH 17TH STREET, SUITE 900 ROSSLYN. VA 22209www.NEMA.orgTO ORDER ADDITIONAL NEMA STANDARDS VISITWWW.GLOBAL.IHS.COM OR CALL 1-800-854-7179/1-303-397-79565612_0514TB
