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1、J IS JAPANESE I N DUSTR IAL STAN DARD Translated and Published by Japanese Standards Association Watches and clocks - Indication of battery life ICs 29.220.10 Descriptors : clocks, electric cells, life (durability) Reference number : JIS B 7026 : 1997 (E) PROTECTED BY COPYRIGHT 4s Copyright Japanese
2、 Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:21:13 MSTNo reproduction or networking permitted without license from IHS -,-,- B 7026 : 1997 Foreword This translation has been made based on the original
3、Japanese Industrial Standard established by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law: Date of Establishment: 1997-03-20 Date of Public Notice in Official Gazette: 1997-03-21
4、 Investigated by: Japanese Industrial Standards Committee Divisional Council on Precision Machinery JIS B 7026:1997, First English edition published in 1997-09 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107 JAPAN In the event of any doubts arising
5、as to the contents, the original JIS is to be the final authority. O JSA 1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in
6、writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:21:13 MSTNo reproduction or networking permitted without license from
7、IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS B 7026 : 1997 Watches and clocks- Indication of battery life 1 This Japanese Industrial Standard covers watches and clocks employing primary batteries as the power supply and specifies the procedures for obtaining the battery life and the method for indicat
8、ion thereof, when the indication of life of bat- tery for watches and clocks is carried out. Scope Remarks 1 This Standard is intended to serve as a guideline for correct indica- tion of life of battery for watches and clocks by the manufacturer or selling agency. 2 This is not applied to the watche
9、s and clocks stated below. (1) (2) Ones for special use such as timers and stopwatches. Clocks built in other products. 2 Definitions For the purpose of this Standard, the following principal defini- tions apply: (i) clock battery life (L) The period from the instant when a certain battery is built
10、in a clock (including watch) and start to drive it to the instant when the clock stops or the reading of liquid crystal indication becomes impossible under the standard service conditions. This definition includes such cases that the clock stops or the liquid crystal indication becomes non-readable
11、due to operation of the additional function stated in 4.2 and that the additional function stated in 4.2 is not operated. (2) prescribed battery This means the battery which is not yet used, specified by the manufacturer or selling agency in the instruction manual or the like, and stored at a temper
12、ature not exceeding 28 “C without exposure to direct sun- shine and high temperature and high humidity. (3) standard service conditions The conditions under which majority of users use clocks everyday. The service conditions of additional function are within the extent of indication specified in 4.2
13、. (4) average value of clock battery life ( E ) life distribution estimated from the test data on clocks and batteries. The average value of clock battery (5) minimum value of clock battery life (Lmin) Such a value on the distribu- tion curve that 99.7 % of clocks sampled have longer clock battery l
14、ife than the said value. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:21:13 MSTNo reproduction or networking permitted without license from IHS -,-,- 2 B 7026 :
15、 1997 3 Procedure of obtaining clock battery life The clock mined by the capacity and self discharge rate of battery built rent consumption of clock, the frequency of use of additional battery life is deter- in the clock, the cur- functions, and so on. The values of parameters which determine the ba
16、ttery life show dispersion for ev- ery individual clock, battery and user. The values of capacity and self discharge rate of battery are obtained from the destructive test only. Therefore these values of a battery itself built in a clock can not be obtained directly, and estimated from the test data
17、 of batteries of the same type. Accordingly, the distribution of clock battery life is estimated by the method stated below from the test data of clocks and batteries. (i) Method by use of calculation formula When tained by calculation, the average value and the individual parameter on the clock and
18、 the battery calculated from formula (i). the clock battery life is ob- dispersion of the values of are obtained and the life is (1) . where, AO : initial capacity (mAh) Ak : loss capacity due to self discharge during storage of battery for 6 months (mAh) I : current consumption (PA) (i) The current
19、 normally consumed by quartz oscillator, integrated circuit, step motor, liq- uid crystal panel, etc. is an intermittent cur- rent, but it is treated as a constant current averaged over the whole period. The current consumed by additional function is treated as a constant current averaged over the w
20、hole period in accordance with the mark- ing of 4.2. p : factor of proportionality of self discharge which is obtained from the following formula: (2) in( 1 - a) = t t : number of years over which self discharge rate CI is determined a : self discharge rate over t years The above parameters shall be
21、 expressed by the value at a temperature of (23 +3) “C and a humidity of (65 +5) %. (2) Method without use of calculation formula tery life is estimated from the data of test actually carried out on clocks. The distribution of clock bat- PROTECTED BY COPYRIGHT Copyright Japanese Standards Associatio
22、n Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:21:13 MSTNo reproduction or networking permitted without license from IHS -,-,- 3. B 7026 : 1997 4 Marking method The marking method shall be as stated below. 4.1 Marking of clo
23、ck battery life If the requirements of formula (2) and for- mula (3) are satisfied, the clock battery life shall be marked “approximately n years”. The n shall be 1, 1.5, 2, 2.5 or an integer 3 or more. However, in the case of n 2, the clock battery life may be marked “approximately O months” in the
24、 unit of month. - . L 2 n (2) . . L min 2 - 0.9n (3) where, n : marked clock battery life (year) 4.2 Marking for service conditions of additional function The service con- ditions of the additional functions which affect the battery life depend upon the fre- quency of use shall be marked on the inst
25、ruction manual. However, the additional functions which are operated by separate power supply are exempted from the above requirements. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for R
26、esale, 03/10/2007 07:21:13 MSTNo reproduction or networking permitted without license from IHS -,-,- Errata for JIS (English edition) are printed in Sfandardizafion Journal, published monthly by the Japanese Standards Association, and also provided to subscribers of JIS (English edition) in Monthly
27、Information. Errata will be provided upon request, please contact: Standardization Promotion Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107 JAPAN TEL. 03-3583-8002 FAX. 03-3583-0462 PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 07:21:13 MSTNo reproduction or networking permitted without license from IHS -,-,-