BS EN 60564-1979 D C bridges for measuring resistance《测量电阻用直流电桥》.pdf

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1、BRITISH STANDARD BS EN 60564:1993 Incorporating Amendment No. 1 to BS 5764:1979 (renumbers the BS as BS EN 60564:1993) and Amendment No. 1 to BS EN 60564:1993 D.C. bridges for measuring resistance The European Standard EN 60564:1993 with the incorporation of amendmentA2:1997 has the status of a Brit

2、ish Standard ICS 17.220.20BSEN60564:1993 This British Standard, having been prepared under the directionof the Power Electrical Engineering Standards Committee, was published underthe authority of the Executive Board and comes into effect on 31 July, 1979 BSI 06-1999 ISBN 0 580 10865 1 Committees re

3、sponsible for this British Standard The Power Electrical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committe

4、e Association of Short Circuit Testing Authorities British Electrical and Allied Manufacturers Association (BEAMA) British Railways Board British Steel Corporation Department of Energy (Electricity)* Electrical Contractors Association Electrical Contractors Association of Scotland Electrical Researc

5、h Association Electricity Supply Industry in England and Wales* Engineering Equipment Users Association Institute of Purchasing and Supply Institution of Electrical Engineers* Ministry of Defence* National Coal Board National Economic Development Office The organizations marked with an asterisk in t

6、he above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Consulting Engineers Association of Supervisory and Executive Engineers British Industrial Measuring and Control Apparatus Manufacturers Asso

7、ciation Department of Industry (British Calibration Service) Department of Industry (National Physical Laboratory) Electrical Power Engineers Association Electronic Components Industry Federation Engineering Teaching Equipment Manufacturers Association Post Office Scientific Instrument Manufacturers

8、 Association Individual expert Amendments issued since publication Amd. No. Date Comments 7912 October 1993 10282 March 1999 Indicated by a sideline in the marginBSEN60564:1993 BSI 06-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 60564 3 Pu

9、blications referred to Inside back coverBSEN60564:1993 ii BSI 06-1999 National foreword This British Standard has been prepared by Technical Committee PEL/85 (formerly PEL/13) and is the English language version of BS EN60564:1993 including amendment A2:1997. It is identical with IEC564:1977 includi

10、ng amendment A1:1981 and amendment A2:1997. Terminology and conventions. The text of the international standard has been approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British Standards; at

11、tention is especially drawn to the following. The abbreviation “ppm” denotes parts in 10 6 . Textual note. There is no abbreviation specified in IEC 61010-1 amendment 2 for pollution degree. Suggested alternative “PD” has been used. The British Standards which implement international or European pub

12、lications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index” or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provis

13、ions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page,

14、 pages 2 to 14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60564 April 1993 + A2 Nove

15、mber 1997 UDC 621.317.733.011.2:621.3.024 Supersedes HD 615 S1:1992 Descriptors: Measuring instrument, resistance measurement, bridge for measuring resistance, DC bridge English version D.C. bridges for measuring resistance (Includes amendment A2:1997) (IEC 564:1977 + A1:1981 and A2:1997) Ponts cour

16、ant continu pour mesure de rsistance fixes (Inclut lamendement A2:1997) (CEI 564:1977 + A1:1981 et A2:1997) Gleichstrom-Widerstandsmebrcken (Enthlt nderung A2:1997) (IEC 564:1977 + A1:1981 und A2:1997) This European Standard was approved by CENELEC on 1993-03-09; amendment A2 was approved by CENELEC

17、 on 1997-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards

18、may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified

19、to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Uni

20、tedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN 60564:1993 + A2

21、:1997 EEN60564:1993 BSI 06-1999 2 Foreword At the request of 72 Technical Board, HD615S1:1992 (IEC564:1977 + A1:1981) was submitted to the CENELEC voting procedure for conversion into a European Standard. The text of the International Standard was approved by CENELEC as EN60564 on 9 March 1993. The

22、following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Foreword to amendment A2 The text of document 85/170/FDIS, future amendment 2 to IEC60564:1977, prepared by IEC TC85, Measuring equipment for electromagnetic quan

23、tities, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A2 to EN60564:1993 on 1997-10-01. The following dates were fixed: For products which have complied with EN60564:1993 before 1998-07-01, as shown by the manufacturer or by a certification body, this previo

24、us standard may continue to apply for production until 2003-07-01. Contents Page Foreword 2 1 Scope 3 2 Terms and definitions 3 3 Classification 6 4 Stability 6 5 Permissible limits of intrinsic error 6 6 Conditions for the determination of intrinsic errors 7 7 Permissible variations 8 8 Additional

25、electrical and mechanical requirements 8 9 Information, markings and symbols 9 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 13 Table I Reference conditions and tolerances of the influence quantities 7 Table II

26、 Limits of the nominal range of use and permissible variations 8 Table III Symbols for marking bridges 12 latest date of publication of an identical national standard (dop) 1994-03-01 latest date of withdrawal of conflicting national standards (dow) latest date by which the amendment has to be imple

27、mented at national level by publication of an identical national standard or by endorsement (dop) 1998-07-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 1998-07-01BSEN60564:1993 BSI 06-1999 3 1 Scope This standard applies to d.c.bridges for m

28、easuring resistance. It also applies to auxiliary equipment which is a built-in part of the bridge. This standard does not apply to bridge comparators 1) , nor to self-balancing bridges nor to those which employ graduations on the null detector to obtain a part of the indicated value, nor to externa

29、l auxiliary equipment used with the bridge. 2 Terms and definitions For the purposes of this standard, the following definitions apply: 2.1 D.C.bridge for measuring resistance (hereinafter designated “bridge”) the assembly of at least three resistance arms which, together with a test resistor, forms

30、 a bridge network; a source of direct current and a null detector are also required for its operation: these may or may not be built-in. At balance, there exists a calculable relationship between the resistance values of the resistors NOTEA d.c.bridge for measuring resistance may be intended to meas

31、ure two-terminal or four-terminal resistors each with or without a leakage current screen (circuit); it will be termed accordingly a two-terminal bridge or a four-terminal bridge with or without provision for a leakage current screen (circuit). 2.2 test resistor the resistor whose resistance value i

32、s to be measured 2.3 two-terminal resistor a resistor having a single combined current-potential terminal at each end 2.4 four-terminal resistor a resistor having two terminals at each end, one for connection into a current-carrying circuit and one for connection to a potential measuring circuit NOT

33、EThe value of the resistance is defined as the quotient of the potential difference between the two potential terminals to the current entering and leaving the current terminals, provided that no current is drawn from the potential terminals. 2.5 resistor with leakage current screen (circuit) a resi

34、stor having a leakage current screen (circuit) connected to a separate terminal, which is often called the “guard terminal” NOTEA resistor with leakage current screen (circuit) may be represented as a delta network consisting of an equivalent value of resistance connected between each pair of termin

35、als. Of these three resistances, the resistance between the two main terminals is the main equivalent resistance which is intended to be measured. The other two resistances of the delta network are usually insulation (leakage) resistances which, for very high values of the main equivalent resistance

36、, may be of the same order or smaller than it. The main equivalent resistance may appear either as a two-terminal resistor or as a four-terminal resistor. 2.6 resistance decade a multiple resistor which, usually by means of a switching device, allows the selection of a combination of resistance valu

37、es rising in equal steps, each step corresponding to an increment of a decadic resistance value such as, for example, 0.17, 1 7 or 107 NOTEA resistance decade generally allows a selection of 10, 11 or 12 resistance values (including zero). 2.7 range-changing device a switch or similar device whereby

38、 the effective range may be multiplied by a factor (e.g.0.1) which is known as the “range factor” or “range multiplier” 1) A bridge comparator is a device intended to compare two resistors, e.g.a two-arm adjustable ratio setBSEN60564:1993 4 BSI 06-1999 2.8 measuring dials the dials from which, takin

39、g into account the setting of the range-changing device(s), if any, the value of the test resistor is determined 2.9 connecting resistance (potential) for a four-terminal bridge, the resistance of the conductor connecting a potential terminal of the bridge to the corresponding potential terminal of

40、the test resistor, plus the resistance of the potential conductor inside the test resistor 2.10 link resistance (current) for a four-terminal bridge, the resistance of the conductor connecting a current terminal of the bridge to the corresponding current terminal of the test resistor, plus the resis

41、tance of the current conductor inside the test resistor 2.11 auxiliary equipment additional equipment, which is or is not an integral part of the bridge, necessary to enable the bridge to operate accurately and safely as specified 2.12 ripple content the ripple content of a d.c.supply, expressed as

42、a percentage of the mean value of the supply is: 2.13 leakage current screen (circuit) a conducting path which prevents leakage currents from affecting the results of measurements NOTEThe terminal of the leakage current screen (circuit) is often called the “guard terminal”. 2.14 electrostatic screen

43、 an electrically conductive enclosure or coating intended to protect the enclosed space from external electrostatic influences 2.15 measuring terminals the terminals to which the test resistor is intended to be connected 2.16 measuring circuit the internal circuit of the bridge which is (or can be)

44、conductively connected to the measuring terminals 2.17 effective range for a specified range factor, the range between the minimum and maximum values of resistance which can be measured with the stated accuracy 2.18 overall effective range using all range factors, the overall range of resistance val

45、ues which can be measured with the stated accuracy 2.19 dial setting the setting of the measuring dial(s) after balancing the bridge, multiplied by the range factor, if applicable, when determining the value of a test resistor r.m.s. value of the fluctuating component mean value of the supply -100 B

46、SEN60564:1993 BSI 06-1999 5 2.20 resolution for measuring dials with discrete settings only, the resistance corresponding to one step on the measuring dial of lowest value on any specified range for measuring dials in which one dial is continuously adjustable, the resistance corresponding to the sma

47、llest division on the measuring dial of lowest value in any region of the dial setting on any specified range NOTEFor continuously adjustable dials which are non-linear, the resolution may change with the dial setting. 2.21 influence quantity a quantity, other than the measured quantity, which is li

48、able to cause unwanted variation in the dial setting 2.22 reference conditions the specified conditions under which the bridge meets the requirements concerning intrinsic error(s) 2.23 reference value a specified single value of an influence quantity at which, within the stated tolerance, the bridge

49、 meets the requirements concerning intrinsic error(s) 2.24 reference range a specified range of values of an influence quantity within which the bridge meets the requirements concerning intrinsic error(s) 2.25 variation with influence quantity the difference between the dial settings for a constant value test resistor when an influence quantity assumes successively two different specified values 2.26 nominal range of use a speci