欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    ISO 10157-1991 Photography flash exposure meter requirements《摄影 闪光灯爆光表要求》.pdf

    • 资源ID:1249474       资源大小:1,022KB        全文页数:8页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    ISO 10157-1991 Photography flash exposure meter requirements《摄影 闪光灯爆光表要求》.pdf

    1、INTERNATIONAL STANDARD 10157 First edition 1991-06-15 Corrected and reprinted 1991-09-15 Photography - Flash exposure meter - Requirements Photographic - Exposimetre pour flash - Prescriptions Reference number IS0 10157:1991(E) IS0 10157:1991(E) Foreword IS0 (the International Organization for Stand

    2、ardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right

    3、to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft Internat

    4、ional Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an lnter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 10157 was prepared by Technical Committee ISO/TC 42, Photo

    5、graphy. Annex A of this International Standard is for information only. 83 IS0 1991 All rights reserved. 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 writing from the publi

    6、sher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii INTERNATIONAL STANDARD IS0 10157:1991(E) Photography - Flash exposure meter - Requirements I Scope This International Standard applies to photoelectric flash exposure mete

    7、rs which measure the time in- tegral of the luminance or of the illuminance of a photographic object (to be called thereafter “object”) illuminated by a source of light for a brief illumination period l) and indicate the time integral or a number corresponding to the time integral or thefinumber req

    8、uired for the correct exposure of a photographic film with a given speed. Continuous light, which is available in addition to the light emitted by the flash light source, is also evalu- ated. NOTE 1 If the object is illuminated by electronic flash equipment with automatic exposure control, the measu

    9、r- ing results of the flash exposure meter can deviate from the calibration values of the flash equipment. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the

    10、editions indicated were valid. All stan- dards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of

    11、 currently valid International Standards. IS0 2720:1974, Photography - General purpose photographic exposure meters (photoelectric type - Guide to product specification. IEC 68-2-6: 1960, Basic environmental testing pro- cedures for electrkaI components and electronic equipment - Part 2: Tests - Tes

    12、t F: Vibration. IEC 348: 1971, Safety requirements for electronic measuring apparatus. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 luminance coefficient, 4: The luminance coef- ficient, 4, is the ratio of the luminance, I, of the sample for a g

    13、iven observation direction to the illuminance, E, on the sample (q = L/E). 3.2 gate time: The gate time of the measuring cir- cuit is the time in which the flash light meter is measuring. 3.3 storage time: The storage time is that time after the end of the gate time in which the indicated value chan

    14、ges by Ifi 7 % corresponding to + l/IO I$*). 3.4 acceptance angle: See definition in IS0 2720. 4 Scales Relative aperture scale, exposure time scale and film speed scale are to be selected in accordance with IS0 2720. 5 General characteristic quantities of the flash exposure meter 5.1 Measuring rang

    15、e It is recommended that the measuring range be in- dicated in candela seconds per square metre when measuring the time integral of luminance of the ob- ject and in lux seconds when measuring the time integral of illuminance of the object. In addition, the aperture range and the luminous time (flash

    16、 duration) range are to be indicated, in 1) Wthin the range of gate time specified by the manufacturer for the specific meter. 2) E,= Exposure value. IS0 10157:1991 (E) which a measurement of flash light at an IS0 100/21 film speed is possible. 5.2 Gate time During the gate time both the light of th

    17、e flash light source and the light of the surroundings (continuous light) are to be measured. It is recommended that the times of the exposure time scale be used in ac- cordance with IS0 2720. If there is only one fixed gate time, it must not be less than 0,00781 s and is to be indicated. If the fla

    18、sh exposure meter does not, or does not completely, evaluate continuous light, this fact is also to be indicated. 5.3 Storage time If the meter incorporates an automatic switching-off circuit, the storage time shall be long enough so that the meter indication can be read. The storage time shall be i

    19、ndicated on the exposure meter or in the instruction booklet. 6 Calibration 6.1 Measuring method For calibration or for checking the calibration, known exposures are produced and compared with the in- dication of the flash exposure meter when measur- ing the light at the same place as the acceptance

    20、 device of the flash exposure meter. 6.2 Light source The calibration of flash exposure meters is to be checked with a light source of the correlated colour temperature of 5 500 K+ 200 K. It must be possible to set the duration of the light source, one-tenth of the time value, to between 0,8 x lo-2

    21、s and 3,o x 10-4 s. 6.3 Measuring the light which falls upon the object 5.4 Addition of individual measurements If the measuring values of individual measurements are or can be added with the flash exposure meter, the deviation from the sum of four single flashes (provided there is a constant radiat

    22、ion from the flash light source) must not be greater than 1/5FW. 55 . Acceptance angle The acceptance angles are measured in accordance with IS0 2720. 5.6 Spectral response The spectral response of the photoelectric receiver shall show no discontinuities within the visible spectrum (380 nm to 780 nm

    23、). The ratio of the indications of the receiver, including optical elements, for a luminance of the distribution temperature of 4 700 K compared with that of the CIE standard illuminant C (representing daylight with a correlated colour temperature of 6774 K), shall be 1 1$ (corresponding to + l/3 JE

    24、dt is the time integral of illuminance, E, in lux . f A is the f-number; is the arithmetic IS0 film speed; 7 0 c is the logarithmic IS0 film speed; c- 7 J is a constant which can be selected by the manufacturer in the range of 210 1x-s to 420 1x-s for the given type of exposure meter. NOTE 3 The ref

    25、lectance of the object, which is con- sidered to be a uniform diffuser, is assumed to be 0,18. If a reflected-light type flash exposure meter is to be designed, the calibration constant (C) can be deter- mined by using the reflectance of the object. 2 IS0 10157:1991(E) 7 Measuring accuracy 7.1 Error

    26、 limits of the indication The combined effect of calibration temperature, hu- midity, storage condition, exposure, vibration ex- posure, shock exposure, position, and flash duration shall not cause the indication to vary by more than + 3/4&Z, from the nominal value. - 7.2 Flash duration and illumina

    27、nce Within the time range between 8 x IO-3 s and IO-4 s and the illuminance range between 5 x IO* lx and 2 x 106 lx, the meter shall give the same indi- cation with a tolerance of + l/3&, for the same amount of the time integral of illuminance. 8 Influence of external measuring conditions 8.1 Temper

    28、ature range The values indicated by the flash exposure meter, at temperatures of between 0 OC and 40 OC, com- bined with other effects, must not differ by more than the tolerance given in 7.1 from the values of the calibration formulae in 6.2 and 6.3. 8.2 Effect of humidity The influence of the humi

    29、dity is expressed as a modification of the exposure indication at 40 OC Ifr 5 “C and (90 + 5) % relative humidity. Following the exposure to high humidity for 48 h and prior to taking measurements, the flash exposure meter shall be stored for 2 h at 23 OC + 3 OC and (65 + 20) % relative humidity. Th

    30、e modification of the climate must be carried out slowly so that the dew point is not reached. 9 Wlechanlcal strength Requirements and testing shall be in accordance with IEC 348. 9.1 Requirements The apparatus shall have adequate mechanical strength. The components shall be reliably fastened and se

    31、cured. The electrical connections shall be re- liable. Internal wiring shall be installed in such a manner that its insulation cannot be damaged. These requirements should be especially con- sidered for apparatus containing sources of vi- bration or shock, and safety measures should be taken against

    32、 influences on other assemblies. Compl iance is checked by inspection and by per- formin g the following tes ts. The tests described in 9.2 and 9.3 shall be performed on portable apparatus. For other apparatus, these tests are recommended but are optional. The tests are based on the assumption that

    33、labora- tory or industrial use of the apparatus causes no abnormal stress. These tests may not be sufficient for apparatus such as that used in vehicles. 9.2 Fall test The apparatus shall be fixed in its position of normal use to a hardwood board and shall be dropped flatly three times on to a hardw

    34、ood plate having a mass of at least three times the falling mass. The test set-up shall be in accordance with IEC 348:1971, fig- ure 5, and the drop height shall be in accordance with table I of this International Standard. Table 1 - Drop height Falling mass I kg Drop height Less than 10 10 to 50 Mo

    35、re than 50 9.3 Vibration test Apparatus shall be subjected to vibration endurance conditioning by frequency sweeping as specified in IEC 68-2-6. The apparatus is fastened in its normal position of use to the vibration generator by means of straps around the enclosure. The direction of vibration is v

    36、ertical, and the conditions are as follows: Duration: 30 min Amplitude (peak-to- 0,35 mm peak): Sweep frequency range: 10 Hz - 55 Hz - 10 Hz Sweep rate: Approximately one octave per minute IS0 10157:1991(E) 9.4 Blow test IEC 348:1971, figure 6. The hammer shall be applied to any external part that,

    37、when broken, is likely to The apparatus is held firmly against a rigid support expose live parts, including handles, levers, knobs, and shall be subjected to sets of three blows from and the like, by pressing the hammer nose a spring-operated impact hammer as shown in perpendicularly to the surface

    38、of that part. IS0 10157:1991(E) Annex A (informative) Bibliography IS0 1230:1973, Photography - Determination of f7ash guide numbers. IS0 2721:1982, Photography - Cameras - Automatic controk of exposure. C3 c4 C5 IS0 2827:1988, Photography - Electronic f7ash equipment - Determination of light output

    39、 and performance. IS0 5763:1989, Photography - Electronic flash equipment - Automatic control of exposure. CIE Publication No.15:1971, Calorimetry. IS0 10157:1991(E) -P-P UDC 771 m376.35 Descriptors: photography, photographic equipment, tests, mechanical tests, drop tests, vibration tests, exposure meters, impact tests. photographic exposure meters, specifications, calibration,


    注意事项

    本文(ISO 10157-1991 Photography flash exposure meter requirements《摄影 闪光灯爆光表要求》.pdf)为本站会员(ideacase155)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开