1、BRITISH STANDARD BS ISO 10330:2002 Photography Synchronizers, ignition circuits and connectors for cameras and photoflash units Electrical characteristics and test methods ICS 37.040.10 BS ISO 10330:2002 This British Standard, having been prepared under the direction of the Consumer Products and Ser
2、vices Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 11 September 2002 BSI 11 September 2002 ISBN 0 580 40358 0 National foreword This British Standard reproduces verbatim ISO 10330:2002 and implements it as the UK national s
3、tandard. The UK participation in its preparation was entrusted to Technical Committee CPW/42, Photography, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement intern
4、ational publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to includ
5、e all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiri
6、es on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page
7、, pages 1 to 17, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 10330:2002(E)INTERNATIONAL STANDARD ISO 10330 Second edition 2002-09-01 Photography Synchr
8、onizers, ignition circuits and connectors for cameras and photoflash units Electrical characteristics and test methods Photographie Interrupteurs synchroniss, circuits damorage et connecteurs pour appareils de prise de vue et sources dclairs Caractristiques lectriques et mthodes dessai BSISO10330:20
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14、ces 1 3 Terms and definitions. 1 4 Requirements 2 4.1 Polarities for synchronizer terminals and ignition circuit terminals . 2 4.2 Voltage across and current through synchronizer terminals and ignition circuit terminals 2 4.3 Ignition circuit operation 4 4.4 Dynamic characteristics of synchronizer.
15、4 4.5 Synchronizer leakage current 5 4.6 Electrical characteristics of cable . 5 5 Test methods . 6 5.1 Ignition circuit operation 6 5.2 Synchronizer dynamic characteristics . 7 5.3 Synchronizer leakage current 7 Annex A (normative) Requirements and test methods 9 Annex B (informative) Additional in
16、formation . 11 Bibliography 17 BSISO10330:2002ivForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each m
17、ember body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
18、Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards a
19、dopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be th
20、e subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 10330 was prepared by Technical Committee ISO/TC 42, Photography. This second edition cancels and replaces the first edition (ISO 10330:1992), of which it constitutes a minor revision. BS
21、ISO10330:2002 vIntroduction When a camera is used in conjunction with a photoflash unit, the photoflash unit can fail to fire, depending upon the combination. The possible causes include a failure of the camera or photoflash unit, poor electrical contact at the connection between both, and the signa
22、l transferred to the photoflash unit for firing it being improper. BSISO10330:2002INTENRATIONAL TSANDADR IS:03301 O2002(E)I SO 2002 All irthgs ersedevr 1Photography Synchronizers, ignition circuits and connectors for cameras and photoflash units Electrical characteristics and test methods 1 Scope Th
23、is International Standard specifies the electrical requirements of the camera synchronizer, the ignition circuit in the photoflash unit and the cable to connect these, and the test methods to secure positive firing of the photoflash unit. 2 Normative references The following referenced documents are
24、 indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 516:1999, Photography Camera shutters Timing ISO 518:1977, Photography Camera acces
25、sory shoes, with and without electrical contacts, for photoflash lamps and electronic photoflash units ISO 519:1992, Photography Hand-held cameras Flash-connector dimensions ISO 8581:1994, Photography Electronic flash equipment Connectors to synchro-cord 3 Terms and definitions For the purposes of t
26、his document, the following terms and definitions apply. 3.1 synchronizer device provided in a camera or shutter unit which fire the photoflash unit in synchronization with the operation of the camera shutter and which consists of synchronizer terminals, a synchronization switch and a circuit that c
27、onnects them NOTE For details of synchronization, refer to ISO 516. 3.2 synchronizer terminals part of the synchronizer which couples the camera or shutter unit with the photoflash unit as does the accessory shoe with electrical contacts defined in ISO 518 and the socket defined in ISO 519 3.3 ignit
28、ion circuit terminals parts of the photoflash unit which are connected to the synchronizer terminals to couple the camera or shutter unit with the photoflash unit to permit firing operation, as does the foot with electrical contacts defined in ISO 518, the plug defined in ISO 519 and the sockets def
29、ined in ISO 8581 BSISO10330:20021IS:03301 O2002(E) 2 I SO 2002 All irthgs ersedevr3.4 synchronization switch switch provided for firing the photoflash unit NOTE It may be a mechanical or electronic switch. 3.5 synchronizer leakage current current flowing through the synchronizer when the specified v
30、oltage is applied across the synchronizer terminals with the synchronization switch turned off 3.6 dynamic characteristics of synchronizer variation with time of the voltage appearing across the synchronizer terminals when the camera synchronizer is operated 3.7 ignition circuit part of the photofla
31、sh unit provided to receive the signal from the synchronizer and fire the electronic flash tube or flash bulb 4 Requirements 4.1 Polarities for synchronizer terminals and ignition circuit terminals The polarities of the synchronizer terminals in a camera and that of the ignition circuit terminals in
32、 a photoflash unit coupled with the camera are defined in 4.1.1 and 4.1.2. The polarity of the camera synchronizer terminals shall be matched to that of the ignition circuit terminals in the coupled photoflash unit. When more than one photoflash unit is connected to a single camera in parallel by us
33、e of a device such as an adapter, it is recommended that a reverse current prevention circuit be incorporated in the adapter or the respective photoflash units to avoid an electrical interference of one photoflash unit with another. 4.1.1 For the “camera accessory shoe with electrical contacts”, def
34、ined in ISO 518, and the “foot of photoflash equipment with electrical contacts”, the contact P shown in Figure 1 shall be the positive pole, while the surface Q shall be the negative pole and, when the photoflash unit is connected to the camera, the potential for P shall be higher than that for Q.
35、4.1.2 For the “socket and plug in small flash connections for hand-held cameras” defined in ISO 519, the part P shown in Figure 2 shall be the positive pole, while the part Q shall be the negative pole and, when the camera is connected to photoflash unit, the potential for P shall be higher than tha
36、t for Q. 4.2 Voltage across and current through synchronizer terminals and ignition circuit terminals The voltage applied across the camera synchronizer terminals and that developed across the ignition circuit terminals in the photoflash unit shall not exceed 24 V d.c. NOTE The 24 V d.c. value is th
37、e same as the value of the “safety extra low voltage” specified in 8.1 in IEC 60335-1:2001. The synchronization current flowing through the camera synchronizer terminals shall be 100 mA at maximum and the current flowing through the ignition circuit terminals in any one of the photoflash units shall
38、 be 30 mA at maximum. BSISO10330:20022IS:03301 O2002(E) I SO 2002 All irthgs ersedevr 3a) Shoe b) Foot Key 1 Part P 2 Part Q 3 Insulation Figure 1 Polarities for camera accessory shoe with electrical contacts and foot of photoflash equipment with electrical contacts a) Socket b) Plug Key 1 Part P 2
39、Part Q 3 Insulation Figure 2 Polarities of sockets and plug in small flash connection for hand-held cameras BSISO10330:20023IS:03301 O2002(E) 4 I SO 2002 All irthgs ersedevr4.3 Ignition circuit operation When a 4,4 M resistor is connected across the ignition circuit terminals and a pulse voltage as
40、shown in Figure 3 is applied across the terminals, the photoflash unit shall be fired. NOTE 1 The resistance value of 4,4 M is specified in consideration of the synchronizer leakage current and the cable insulation resistance. NOTE 2 See A.2 for the requirements for a photoflash unit having an ignit
41、ion circuit which is equipped with precautions against accidental firing and failure to fire due to noise or chattering of the synchronization contacts. V Fis the voltage developed across ignition circuit terminals in a photoflash unit and is equal to 24 V d.c. maximum. V SSis equal to 1,6 V. Figure
42、 3 Voltage waveform across ignition circuit terminals 4.4 Dynamic characteristics of synchronizer When the camera is operated with a 24 V d.c. power supply and 240 resistor connected across the camera synchronizer terminals in series (see Figure 6) and the synchronizer has an electronic switch, then
43、 the terminal voltage for the synchronizer shall be maintained at 1,5 V or less until the synchronization switch is turned off (see the continuous thick line in Figure 4). On the other hand, when the synchronizer has a mechanical switch, at least one of the time periods (T 1to T 2 ) between the mome
44、nt the synchronizer terminal voltage reaches 21 V and the moment a time of 150 s elapses and during which the voltage across the synchronizer terminals is maintained at a value of 1,5 V or less, shall be 10 s or more (see the broken line in Figure 4). NOTE 1 When the synchronizer has a mechanical sy
45、nchronization switch, it is desirable that after a time of 150 s elapses, the synchronizer terminal voltage be maintained at 1,5 V or less over as long a time period as possible. NOTE 2 It is desirable that the synchronization switch be opened after the shutter closing operation is started BSISO1033
46、0:20024IS:03301 O2002(E) I SO 2002 All irthgs ersedevr 54.5 Synchronizer leakage current When a 24 V d.c. voltage is applied across the camera synchronizer terminals with the camera synchronization switch turned off, the leakage current shall be 5 A or less. 4.6 Electrical characteristics of cable 4
47、.6.1 Cable resistance When the cable is short-circuited at one end, the resistance across the terminals at the other end shall be 2 or less. When an extremely long or special cable is used, it should be checked for inductance and capacitance. 4.6.2 Cable capacitance The cable shall have a capacitanc
48、e of 3 000 pF or less. 4.6.3 Cable insulation resistance The insulation resistance of the cable shall be 50 M or higher at 100 V d.c. Key 1 Ideal dynamic characteristic curve 2 Shutter closing operation is started V Cis the testing voltage and is equal to 24 V. V Tis the defined synchronizer startin
49、g voltage and is equal to 21 V. V Sis the upper limit of defined synchronizer on-state voltage and is equal to 1,5 V. Figure 4 Dynamic characteristics of the synchronizer BSISO10330:20025IS:03301 O2002(E) 6 I SO 2002 All irthgs ersedevr5 Test methods 5.1 Ignition circuit operation Connect a pulse generator, a variable-voltage type d.c. voltage generator, a transistor switch, an oscilloscope and a variable resisto
