jjg762-2007引伸計(譯文)

1、<p>　　中華人民共和國國家計量檢定規(guī)程</p><p>　　JJG of the People`s Republic of China</p><p>　　JJG 762-2007</p><p><b>　　引 伸 計</b></p><p>　　Extensometer</p><

2、;p>　　2007一08一21發(fā)布 2008一02一21買施 </p><p>　　Ratified on Aug 21, 2007 Implemented on Feb 21, 2008</p><p>　　國家質(zhì)量監(jiān)督檢驗檢疫總局發(fā)布</p>&l

3、t;p>　　Ratified by General Administration of Quality Supervision, Inspection and Quarantine</p><p><b>　　引伸計檢定規(guī)程</b></p><p>　　Verification Regulation</p><p>　　For Exten

4、someter </p><p>　　本規(guī)程經(jīng)國家質(zhì)量監(jiān)督檢驗檢疫總局2007年8月21日批準，并自</p><p>　　2008年2月21日起施行。</p><p>　　The regulation is ratified by General Administration of Quality Supervision, Inspection and Quara

5、ntine on Aug 21, 2007 and implemented on Feb 21, 2008.</p><p>　　歸口單位: 全國力值硬度計量技術(shù)委員會</p><p>　　Specified Administrative Authority: The National Force Value Hardness Measurement Technology Comm

6、ittee</p><p>　　主要起草單位: 鋼鐵研究總院</p><p>　　Main Drafting Institution: Iron and Steel Research Institute </p><p>　　湖北省計量測試技術(shù)研究院</p><p>　　Institute of Measuring and Testing T

7、echnology of Hubei Province</p><p>　　參加起草單位: 國防科學(xué)技術(shù)大學(xué)</p><p>　　Participating drafting Units: National University of Defense Technology</p><p><b>　　長春試驗機研究所</b></p>

8、<p>　　Changchun Research Institute of Testing Machine</p><p>　　本規(guī)程委托全國力值硬度計量技術(shù)委員會負責解釋</p><p>　　The National Force Value Hardness Measurement Technology Committee is responsible for the in

9、terpretation of the regulation.</p><p><b>　　本規(guī)程主要起草人:</b></p><p>　　Chief Draftsmen of the Regulation:</p><p>　　王春華 (鋼鐵研究總院)</p><p>　　Wang Chunhua （Iron an

10、d Steel Research Institute）</p><p>　　王大充 (湖北省計量測試技術(shù)研究院)</p><p>　　Wang Dachong (Institute of Measuring and Testing Technology of Hubei Province)</p><p>　　崔燕生 (鋼鐵研究總院)</p>

11、<p>　　Cui Yansheng (Iron and Steel Research Institute)</p><p>　　鄭文龍 (國防科學(xué)技術(shù)大學(xué))</p><p>　　Zheng Wenlong (National University of Defense Technology)</p><p><b>　　參加起草人:<

12、/b></p><p>　　Participating draftsmen:</p><p>　　王學(xué)智 (長春試驗機研究所)</p><p>　　Wang Xuezhi (Changchun Institute of Testing Machine)</p><p>　　周巍松 (鋼鐵研究總院)</p><

13、p>　　Zhou Weisong (Iron and Steel Research Institute)</p><p>　　梁新邦 (鋼鐵研究總院)</p><p>　　Liang Xinbang (Iron and Steel Research Institute)</p><p>　　胡翔 (湖北省計量測試技術(shù)研究院)</p>

14、<p>　　Hu Xiang (Institute of Measuring and Testing Technology of Hubei Province)</p><p>　　劉杰 (湖北省計量測試技術(shù)研究院)</p><p>　　Liu Jie (Institute of Measuring and Testing Technology of Hubei Prov

15、ince)</p><p><b>　　目 錄</b></p><p><b>　　Content </b></p><p>　　1范圍···············&#

16、183;····································

17、··················（1）</p><p>　　1 Scope ------------------------------------------------------------- (1)</p>&

18、lt;p>　　2引用文獻··································&

19、#183;·······························（1）</p><p>　　2 C

20、ited References ---------------------------------------------- (1)</p><p>　　3概述·····················&#

21、183;····································

22、···········（1）</p><p>　　3 Overview --------------------------------------------------------- (1)</p><p>　　4計量性能要求····&#

23、183;····································

24、·····················（1）</p><p>　　4 Requirements of Measurement Performances ---------( 1)</p>

25、<p>　　5通用技術(shù)要求·································

26、3;····························（2）</p><p>　　5 General Technical Requ

27、irements ---------------------------------- (2)</p><p>　　S.1銘牌························&

28、#183;····································

29、;·······（2）</p><p>　　S.1 Nameplate ---------------------------------------------------- (2)</p><p>　　S.2外觀與質(zhì)量········&#

30、183;····································

31、················（2）</p><p>　　S.2 Appearance and Quality ------------------------------------ (2)</p><p>　　S.3顯示與輸出

32、····································

33、3;·························（2）</p><p>　　S.3 Display and Output -------------------

34、----------------------- (2)</p><p>　　6計量器具控制···························&

35、#183;··································（2）</p&g

36、t;<p>　　6 Control of Measuring Instruments ----------------------------------- (2)</p><p>　　6.1檢定條件·················

37、;····································

38、83;···········（2）</p><p>　　6.1 Verification Conditions ------------------------------------------------------ (2)</p><p>　　6.2檢定項目和檢定方法

39、3;····································&#

40、183;·················（3）</p><p>　　6.2 Verification Items and Verification Method ------------------------------- (3)</p

41、><p>　　6.3檢定結(jié)果的處理································&

42、#183;··························（4）</p><p>　　6.3 Processing of Verification Re

43、sults ------------------------------- (4)</p><p>　　6.4檢定周期·························

44、;····································

45、83;···（5）</p><p>　　6.4 Calibrating Cycle --------------------------------------- (5)</p><p>　　附錄A引伸計檢定證書內(nèi)頁············&

46、#183;····································

47、;··（6）</p><p>　　Appendix A Inner Sheet of Verification Certificate of Extensometer ------- (6)</p><p>　　附錄B引伸計檢定記錄格式···········&#

48、183;····································

49、···（7）</p><p>　　Appendix B Format of Verification Record of Extensometer -------- (7)</p><p>　　附錄C引伸計的誤差帶示例············

50、····································

51、3;··（8）</p><p>　　Appendix C Demonstration of Error Bands of Extensometer ---------(8) </p><p>　　附錄D引伸計檢定示例·············

52、····································

53、3;·····（9）</p><p>　　Appendix D Verification Demonstration of Extensometer --------- (9)</p><p><b>　　引伸計檢定規(guī)程</b></p><p>　　Verification Regulation

54、 for Extensometer</p><p><b>　　1范圍</b></p><p><b>　　1 Scope</b></p><p>　　本規(guī)程適用于引伸計的首次檢定、后續(xù)檢定和使用中檢定。</p><p>　　The regulation applies to the first-t

55、ime, follow-up and in-service verifications in use of extensometer.</p><p><b>　　2 引用文獻</b></p><p>　　2 Cited References</p><p><b>　　本規(guī)程引用下列文獻</b></p>&

56、lt;p>　　The regulation refers to the following documents</p><p>　　GB/T 228—2002《金屬材料室溫拉伸試驗方法》</p><p>　　GB/T 228—2002 Metallic Materials Tensile Testing at Ambient Temperature </p><p

57、>　　GB/T 1040.1——2006《塑料拉伸性能的測定 第1部分：總則》</p><p>　　GB/T 1040.1——2006 Determination of Tensile Properties of Plastics Part 1: General Principles</p><p>　　GB/T 7314—2005《金屬材料 室溫壓縮拉伸試驗方法》</p

58、><p>　　GB/T 7314—2005 Metallic Materials Compression and Tensile Testing at</p><p>　　Ambient Temperature</p><p>　　GB/T 12160—2002/ISO 953：1999《單軸實驗用引伸計的標定》</p><p>　　GB/T 1

59、2160—2002/ISO 953：1999 Calibration of Extensometer in Uniaxial</p><p>　　Experiment</p><p>　　JJF 1096—2002《引伸計標定器校準規(guī)范》</p><p>　　JJF 1096—2002 Standard Calibration of Extensometer Des

60、ignator</p><p>　　ASTM E83—02 Standard Practice for Verification and Classification of Extensometer System</p><p>　　適用本規(guī)程時，應(yīng)注意使用上述引用文獻的現(xiàn)行有效版本。</p><p>　　Please pay attention to the cu

61、rrent valid version of the cited documents above while using the regulation.</p><p><b>　　3 概述</b></p><p>　　3 Overview</p><p>　　3.1 引伸計是試驗機對試樣施加軸向力時，測量試樣線變形的裝置，包括測量、指示或記

62、錄系統(tǒng)。根據(jù)結(jié)構(gòu)特點，分為電子式和機械式兩種。</p><p>　　3.1 Extensometer is a device applied to measurement of sample line deformation while axial force is pressed onto the sample by the testing machine, including measuring, indic

63、ating or recording system. According to structural characteristics, it can be divided into electronic extensometer and mechanical extensometer.</p><p>　　注：電子式引伸計，如電阻應(yīng)變式、電感式引伸計，其工作需配備相應(yīng)的放大器、計算機或指示裝置能自動記錄或顯示所測

64、位移示值。故標定電子式引伸計時必須包括與其配套的整個測量系統(tǒng)。機械式引伸計，如百分表式、杠桿式、光學(xué)式引伸計，是由指針或光標直接指示位移示值。</p><p>　　Note: The operation of electronic extensometer, such as resistance strain gauge extensometer and inductive extensometer, shoul

65、d be equipped with the appropriate amplifier, computer or indicating device to record or show the measured displacement values automatically. Therefore, the calibration of electronic extensometer must include its entire

66、supporting measurement system. Mechanical extensometer, such as dial indicator extensometer, lever-type extensometer and optical extensometer, indicate di</p><p>　　引伸計檢定時應(yīng)獲得引伸計系統(tǒng)最終位移量值的信息。</p><p&g

67、t;　　3.2 Information of the final displacement value of the extensometer system should be obtained while using extensometer for verification.</p><p>　　對引伸計的檢定就是將引伸計的讀數(shù)與標定器給定的已知長度的變化量進行比較對引伸計分級并確定引伸計的準確度，以滿足GB

68、/T 228、GB/T 1040、GB/T 7314等拉伸和壓縮試驗方法標準對引伸計的要求，保證材料試驗結(jié)果的正確性。</p><p>　　3.3 By comparing the indication of extensometer with the variation quantity of a known length given by the designator, the classification

69、and accuracy of the extensometers can be made to meet the needs in the tensile and compression testing with extensometer of GB/T 228, GB/T 1040, GB/T 7314 and so on, which can ensure the accuracy of material test results

70、.</p><p><b>　　4計量性能要求</b></p><p>　　4 Requirements of Measurement Performances</p><p>　　4.1各級別引伸計的標距相對誤差，應(yīng)符合表1的規(guī)定。</p><p>　　4.1 The gauge length relative err

71、or of extensometer of various levels should meet the requirements in Table 1.</p><p>　　4.2各級別引伸計的分辨力，應(yīng)符合表1的規(guī)定。</p><p>　　4.2 The resolving power of extensometer of various levels should meet the

72、requirements in Table 1.</p><p>　　4.3各級別引伸計的示值誤差、示值進回程相對誤差，應(yīng)符合表1的規(guī)定。</p><p>　　4.3 The indication error, relative error between forward and backward in indicating value of extensometer of various

73、 levels should meet the requirements in Table 1. </p><p>　　表1 引伸計計量特性</p><p>　　Table 1 Metrological Characteristics of Extensometer</p><p>　　4.4各級別引伸計檢定范圍，應(yīng)根據(jù)用戶需要或被測材料性能所需的測量范圍確定。&

74、lt;/p><p>　　在引伸計全量程內(nèi)可以分多個測量范圍進行檢定。</p><p>　　4.4 Verification range of extensometer of all levels should be determined according to the customers` needs or the measurement range required by characte

75、ristics of tested materials. Within the full-scale range of extensometer, verification can be made in multiple measurement ranges.</p><p><b>　　5通用技術(shù)要求</b></p><p>　　5 General Technica

76、l Requirements</p><p><b>　　5.1銘牌</b></p><p>　　5.1 Nameplate</p><p>　　引伸計及配套儀器的銘牌上，應(yīng)標明儀器名稱、型號、制造廠名、產(chǎn)品編號和出廠</p><p><b>　　日期。</b></p><p&g

77、t;　　Name of the equipment, model number, manufacturer name, product number and date of manufacture should be indicated on the nameplates of extensometer and its supporting equipment.</p><p><b>　　5.2外觀與

78、質(zhì)量</b></p><p>　　5.2 Appearance and Quality</p><p>　　引伸計及其附件不應(yīng)有明顯的機械損傷;刀刃、軸尖等設(shè)定標距的結(jié)構(gòu)不應(yīng)有明顯</p><p>　　磨損;指示裝置和測量機構(gòu)不應(yīng)有影響測量結(jié)果的缺陷。</p><p>　　There should be no significan

79、t mechanical damage in extensometer and its annexes, no significant abrasion in the blade, pivot and other structures used to set gauge length, and no defect which can affect the measurement results in indicating devices

80、 and measuring mechanism. </p><p><b>　　5.3顯示與輸出</b></p><p>　　5.3 Display and Output</p><p>　　電子式引伸計的顯示應(yīng)清晰、完整、穩(wěn)定，打印結(jié)果或繪制的曲線應(yīng)與示值一致。</p><p>　　Display of electr

81、onic extensometer should be clear, complete and stable, and the print results or the drawn curve should be consistent with the indication value.</p><p><b>　　6計量器具控制</b></p><p>　　6 Co

82、ntrol of Measuring Instruments</p><p>　　計量器具控制包括:首次檢定、后續(xù)檢定和使用中檢驗</p><p>　　Control of measuring instruments include the initial verification, subsequent verification and verification in use.</

83、p><p><b>　　6.1檢定條件</b></p><p>　　6.1 Verification Conditions</p><p><b>　　6.1.1環(huán)境條件</b></p><p>　　6.1.1 Environmental Conditions</p><p>　

84、　檢定溫度范圍應(yīng)為23℃±5℃，檢定時的溫度應(yīng)穩(wěn)定，溫度變化不應(yīng)超過2℃，檢</p><p>　　定過程不允許有影響引伸計檢定結(jié)果的空氣對流。</p><p>　　The range of verification temperature should be 23 ℃ ± 5℃, while the temperature should be stable and th

85、e change should not exceed 2℃. The air convection which can affect the verification results during the process is not allowed.</p><p>　　對10℃~35℃溫度范圍內(nèi)試驗用引伸計，如有條件，也可在試驗溫度或接近試驗</p><p><b>　　溫度

86、下進行檢定。</b></p><p>　　Trying using the extensometer at the temperature from 10 ℃ to 35 ℃ if allowed, verification can also be made at the trial temperature or one close to it.</p><p>　　引伸計和標

87、定器應(yīng)在同一室溫放置不少于30min的時間，待溫度平衡后再進行</p><p><b>　　檢定。</b></p><p>　　Extensometer and designator should be placed at the same ambient temperature for no less than 30mins until the temperatur

88、e equilibrium is reached.</p><p>　　6 .1 .2檢定用標準器具</p><p>　　6.1.2 Standard Equipment for Verification</p><p>　　6 .1 .2.1引伸計標定器應(yīng)符合JJF 1096-2002的要求，其允許誤差應(yīng)符合表2的</p><p><

89、b>　　規(guī)定。</b></p><p>　　6.1.2.1 Extensometer designator should meet the requirements of JJF1096-2002, and the permissible error should meet the regulation in Table 2.</p><p>　　表2 標定器計量特性&

90、lt;/p><p>　　Table 2 Metrological Characteristics of Calibration Device</p><p>　　6 .1 .2.2 測量引伸計標距用的游標卡尺或工具顯微鏡，其最大允許誤差不應(yīng)大于引伸 </p><p>　　計標距最大允許誤差的1/3。</p><p>　　6.1.2.2 The m

91、aximum permissible error of the venire caliper or tool microscope used to measure extensometer gauge length should not exceed one third of the maximum permissible error of extensometer.</p><p>　　6.2檢定項目和檢定方法

92、</p><p>　　6.2 Verification Items and Verification Method</p><p>　　首次檢定、后續(xù)檢定和使用中檢驗相同。</p><p>　　The verification items and verification method are the same in the initial verification

93、, subsequent verification and verification in use.</p><p><b>　　6.2.1外觀檢查</b></p><p>　　6.2.1 Appearence Inspection</p><p>　　通過觀察和實際操作，對第5章規(guī)定的內(nèi)容進行檢查。</p><p>　

94、　Inspect the contents required in Chapter 5 through observation and practice.</p><p>　　6.2.2 安裝要求</p><p>　　6.2.2 Installation Requirements</p><p>　　引伸計應(yīng)以常規(guī)試驗時所使用的位置和方向安裝到標定器上，并避免由于失

95、去平衡或引伸計任何一部分的變形所產(chǎn)生的誤差。</p><p>　　Extensometer should be installed onto the designator with the location and direction used in conventional trial, which can avoid error because of loss of balance or deformatio

96、n on any part of extensometer.</p><p>　　檢定時所采用的引伸計的標距、放大倍數(shù)、裝卡方法、位移方向、數(shù)據(jù)的讀取和記</p><p>　　錄方法以及記錄程序，應(yīng)盡可能與使用狀態(tài)一致。</p><p>　　Gauge length, amplification factor, method of installing cards,

97、 the displacement direction, reading, recording methods and the recording procedures of the data of the extensometer used for the verification should be consistent with those while it is used as far as possible.</p&g

98、t;<p>　　6.2.3 引伸計標距的檢定 </p><p>　　6.2.3 The Verification of Extensometer Gauge Length</p><p>　　對于可直接測定標距的引伸計，測量時應(yīng)在完成安裝的準備工作后，直接測定其標</p><p>　　距。不能直接測量時，可將引伸計安裝在軟金屬試樣上，測量引伸計刀刃或軸

99、尖在試樣留下印痕間的距離。 </p><p>　　As for the extensometer whose gauge length can be measured directly, the measurement should be implemented after finishing preparation for the installation. While the measurement cann

100、ot be made directly, extensometer can be installed onto the soft metal sample to measure the distance of prints in the sample left by blade or shaft tip of the extensometer.</p><p>　　每個標距測量3次，每次測定的引伸計標距相對誤差均

101、應(yīng)滿足表1的要求。</p><p>　　Each gauge length should be measured for three times, and the relative error of extensometer gauge length each time should meet the requirements of Table 1.</p><p>　　引伸計標距相對誤差

102、按公式(1)計算。</p><p>　　The relative error of extensometer gauge length can be calculated according to Formula (1).</p><p>　　qLe=×100% (1)</p><p>　　式中：qLe—引伸計標距相對誤

103、差，</p><p>　　In Formula (1) : qLe—the relative error of extensometer gauge length,</p><p>　　引伸計標距的測量值，mm;</p><p>　　Le’— measured value of extensometer gauge length, mm,</p>&l

104、t;p>　　Le—引伸計標距的標準值，mm.</p><p>　　Le—standard value of extensometer gauge length, mm. </p><p>　　當引申計具有多個標準時，應(yīng)分別對每個標距進行檢定。</p><p>　　Each gauge length should be tested separately w

105、hen there are multiple criteria for extensometer.</p><p>　　對于以試樣確定標距的引伸計(例如以試樣直徑或?qū)挾却_定引伸計標距、帶凸耳試</p><p>　　樣由兩凸耳的中心線距離確定引伸計標距).被測試樣標距的相對誤差應(yīng)與待用引伸計</p><p>　　相應(yīng)級別的允許誤差相符。</p><

106、p>　　As for the extensometer whose gauge length is determined by sample (such as determining the gauge length with the diameter or width of the sample, or with the center line distance between the two lugs of lug-type

107、sample), the relative error of gauge length of test sample should be consistent with the permissible error in corresponding level of extensometer prepared for using.</p><p><b>　　3</b></p>

108、<p>　　6.2.4分辨力的檢定</p><p>　　6.2.4 Verification of Resolving Power</p><p>　　絕對分辨力γ是從引伸計的指示裝置上能讀取的最小量值。相對分辨力是從儀器</p><p>　　上能讀取的最小量值γ與引伸計指示的位移li之比值。目測檢查并計算引伸計的分辨</p><p&g

109、t;　　力，其結(jié)果應(yīng)滿足表1的要求。</p><p>　　The absolute resolving power γ is the minimum value that can be read from the indicating device of extensometer. The relative resolving power is the ratio of the minimum value γ t

110、hat can be read from the instrument divided by displacement li indicated by extensometer. Visually inspect and calculate the resolving power of the extensometer, and its results should meet the requirements in Table 1.&l

111、t;/p><p>　　6 .2 .5 示值誤差的檢定</p><p>　　6.2.5 Verification of Indication Error</p><p>　　6 .2.5.1 當溫度已經(jīng)穩(wěn)定，檢定前用標定器對引伸計至少預(yù)加對應(yīng)于該引伸計檢定范</p><p>　　圍的兩次位移。并檢查其回零正常后，再給引伸計施加一個很小的負位移后

112、返回到零位，并將引伸計重新調(diào)零。</p><p>　　6.2.5.1 When the temperature is stable, before the verification at least two corresponding displacement should be added in the range of verification of the extensometer through desi

113、gnator.</p><p>　　依據(jù)4.4確定的檢定范圍進行檢定。</p><p>　　6.2.5.2 Start the verification according to the range determined in 4.4.</p><p>　　檢定要做三組測量，每組測量一般不少于10個測量點（不包括零點）。根據(jù)選定的檢定范圍用標定器對引伸計逐點施加給定

114、位移，達到檢定范圍的最大位移時，再返回到零位。第一組測量完成后，取下引伸計，再重新裝到標定器上，然后用與第一組相同的方法連續(xù)進行第二組和第三組測量。</p><p>　　Verification includes three sets of measurements, each of which should include no less than 10 measurement points (excludin

115、g zero). According to the selected verification range, with a designator the given displacement is applied to the extensometer point by point and return to the zero after reaching the maximum displacement in the range of

116、 extensometer. After the first set of measurements, remove the extensometer, re-install it to the designator, and then continue the rest two sets of measurem</p><p>　　檢測點應(yīng)根據(jù)實際使用情況分配，采取相對的均勻分布。</p><

117、;p>　　Points should be allocated based on actual usage, taking a relatively uniform distribution.</p><p>　　對用于測量規(guī)定非比例延伸強度（或規(guī)定非比例壓縮強度）的引伸計，第一個檢測點位移值，一般不應(yīng)超過實際試驗時規(guī)定非比例延伸量。用于測量彈性模量時，檢定的第一點位移值，一般不應(yīng)超過被測材料彈性直線段終點

118、對應(yīng)延伸量的50％。</p><p>　　As for the extensometer which is used to measure stipulated non-proportional extension strength (or stipulated non-proportional compression strength), the displacement of the first point

119、generally should not exceed stipulated non-proportional elongation. While measuring the elastic modulus, the first displacement generally should not exceed 50% of the corresponding elongation of the end point in the elas

120、tic straight line of the measured materials.</p><p>　　對于某一給定位移，引伸計示值相對誤差按公式（2）計算</p><p>　　For a given displacement, the relative error of indication values of extensometer should be calculated a

121、ccording to Formula (2)</p><p>　　q=×100％ （2）</p><p>　　式中： q------引伸計示值進回程相對誤差，%;</p><p>　　In Formula (2): q----relative error between forward and backward in indicating

122、value, %,</p><p>　　li------同一檢測點引伸計指示的回程位移示值，mm;</p><p>　　li ------ the backward displacement value indicated by extensometer in the same point, mm,</p><p>　　lt-------同一檢測點引伸計指示的進程位

123、移示值，mm。</p><p>　　lt-------the forward displacement value indicated by the extensometer in the same point, mm,</p><p>　　需要時，應(yīng)對引伸計的進回程同時進行檢定（例如：以滯后環(huán)法測定規(guī)定非比例延伸強度Rp或測定規(guī)定殘余延伸強度Rr用的引伸計）。檢定時，在進行6.2.5.2

124、規(guī)定的每組測量的過程中，應(yīng)先從零位以進程逐點施加到檢定范圍的最大位移，再以回程逐點返回到零位，如此進行三組測量。檢定范圍的最大值一般取所用引伸計標距的2％。</p><p>　　6.2.5.3 When necessary, the forward and backward stroke of the extensometer should be tested at the same time. (Example

125、: the extensometer used to test stipulated non-proportional extension strength Rp with the method of hysteresis loop, or test stipulated residual extension strength Rr). During the verification of each set of measurement

126、s regulated in 6.2.5, the process should start from zero position to the maximum displacement of the verification range point by point of the process stroke, the</p><p>　　引伸計的示值進回程相對誤差u按公式（3）計算：</p>&

127、lt;p>　　The relative error between forward and backward in indicating value of the extensometer u can be calculated according to Formula (3):</p><p>　　u=×100％ （3）</p><p>　　式中：q——

128、引伸計示值進回程相對誤差，％；</p><p>　　In Formula (3): q----- the relative error between forward and backward in indicating value of the extensometer, %,</p><p>　　li′——同一檢測點引伸計指示的回程位移示值，mm；</p><p&g

129、t;　　li' ---- the backward displacement value indicated by the extensometer in the same point, mm,</p><p>　　li——同一檢測點引伸計指示的回程位移示值，mm。</p><p>　　li -- the backward displacement value indicated

130、by the extensometer in the same measuring point, mm,</p><p><b>　　檢定結(jié)果的處理</b></p><p>　　6.3 Handling of Verification Results</p><p>　　6.3.1 按本規(guī)程檢定結(jié)果評定引伸計的級別，并發(fā)給檢定證書。證書內(nèi)頁格式

131、見</p><p><b>　　附錄A.</b></p><p>　　6.3.1 Assess the level of extensometer according to results and issue Verification Certificate. Format of the inner sheet of the certificate can be se

132、en in Appendix A.</p><p>　　檢定不合格的引伸計，發(fā)給檢定結(jié)果通知書。并注明不合格項目，內(nèi)頁格式見</p><p><b>　　4</b></p><p><b>　　附錄A.</b></p><p>　　Unqualified extensometer through v

133、erification will be given Notice of Verification Results. The unqualified items should be indicated in the Notice of Verification Results, and format of the inner sheet of the Notice can be seen in Appendix A.</p>