JJF1134-2005

2 引用文献····················································································⋯⋯(1) 3 概述··························································································⋯⋯(1) 4 计量特性····················································································⋯⋯(1) 4.1 基本要求·················································································⋯⋯(1) 4.2 安全保护装置···········································································⋯⋯(1) 4.3 测力机准确度级别与技术指标 ······················································⋯⋯(2) 4.4 附加功能·················································································⋯⋯(3) 5 校准条件····················································································⋯⋯(3) 5.1 环境条件·················································································⋯⋯(3) 5.2 力标准器·················································································⋯⋯(3) 6 校准项目和校准方法·····································································⋯⋯(3) 6.1 校准项目·················································································⋯⋯(3) 6.2 校准方法·················································································⋯⋯(4) 6.3 附加功能·················································································⋯⋯(6) 7 校准结果表达··············································································⋯⋯(6) 8 复校时间间隔··············································································⋯⋯(6) 附录A 专用工作测力机校准结果的不确定度评定方法······························⋯⋯(7) 附录B 校准报告内页格式1 ····························································⋯⋯(10) 附录C 校准报告内页格式2 ····························································⋯⋯(11) 附录D 专用工作测力机校准纪录······················································⋯⋯(12) JJF 1134- 2005 专用工作测力机校准规范范围本规范适用于各种规格和级别的压缩试验仪、颗粒强度测试仪等专用工作测力机 (以下简称测力机)的力值校准。 其他专用测力装置的力值校准可参照本规范进行。 2 引用文献 JJF 1059-1999 测量不确定度的评定与表示 JJF 1094-2002 测量仪器特征评定使用本规范时,应注意使用上述引用文献的现行有效版本。 3 概述测力机广泛应用于产品、部件及其在制造、装配工艺中的拉力、压力或相关参数的校准。测力机主要由力驱动装置和力指示装置二大部分构成。测力机工作时由力驱动装置对试样施加试验力。力指示装置指示所测力值或相关测量结果。 4 计.特性 4.1 基本要求 A)测力机的指示装置应使用与被测量单位相一致的法定计量单位作为基本计量单位。 B)指示装置显示的相关测量结果,应能根据说明书提供的技术说明、计算公式及有关常数、系数进行验证。 C)指示装置的零点调节功能 1)力值的零点调节范围应大于由自带附件重力产生的、及不同工作位置、方向 (一般考虑垂直与水平方向)引起的最大零点变化。 2)进入测试状态或测量值大于测量下限后零点调节功能应受到限制。 3)测量部分有多个量程时,各量程切换时的零点应一致,其变化不大于较小量程最大允许误差的1/20 D)用数字显示的测量值应能区分正、负数。 4.2 安全保护装置 A)测力机应有防止试样破碎飞溅、失稳弹出、断裂抛甩等的安全防护结构和 (或)设施。 B)加载系统采用液压、机械驱动方式时应有下列安全保护功能: 1)当试验力达到额定值的102%一110%时,超载保护装置应即时作用停止施加力值。 2)当动力驱动承载装置移动至极限位置时,限位装置应即时作用停止移动。 J任1134- 2005 3)当停止或结束试验的设置条件得到满足时,测力机应即时自动停止或结束试验。 4.3 测力机准确度级别与技术指标 A)以引用误差确定级别时计量特性见表to 表1 测力机级别及技术指标 (FS) 级别(FS) 0.1 0.2 (0.3) (0.4) 0.5 1.0 2.0 (3.0) (4.0) 5.0 技术指标 a' (% FS) _ <0.05X0.20X0.15X0.20毛0.25感0.50 , 1.0 X1.5 簇2.0 蕊2.5 f'o(%FS) - 0.05 土0.1 士0.15 土0.20 士0.25 土0 5 士1.0 士1.5 士2.0 士2.5 ,,(% FS) 士0.10 士0.2 ,0.30 士0.40 +0.50 - 1.0 土2.0 - 3.0 士4.0 士5.0 b'(%FS) 0.10 0.2 0.30 0.40 0.50 1.0 2.0 3.0 4.0 5.0 u'(%FS) 土0.15 士0.3 -0.45 土0.60 +0.75 士1.5 士3.0 士4.5 土6.0 士7.5 说明 a ’一力指示装置的相对分辨力; f‘一回零相对误差; 9}一示值相对误差; b'一示值重复性相对误差; u'一示值进回程相对误差(根据用户需要给出)。 注1:指示丫,b',u'用于测力机定级时参考,除非用户需要一般不据此给出符合与否的评定。 注2:不带括号的级别为优先推荐采用的级别。 B)以相对误差确定级别时计量特性见表20 表2 测力机级别及技术指标级别 a(% ) f (%) 4(%) b(%) u(% ) 0.5 2.0 3.0 (4.0) 5.0 毛0.25 , 0.5 冬1.0 毛I .5 士1.5 , 2.5 士0.25 士0.5 t 1.0 士2 5 攀一抓士0-5 士1 0 生2 _0 士3 0 士4.0 土5 .0 0 .5 1.0 2.0 3.0 5.0 技术指标士0.75 士1 _5 士3 _0 士4 -5 4.0 士6.0 士7.5 说明。一力指示装置的相对分辨力; f一回零相对误差; q一示值相对误差; b一示值重复性相对误差; “一示值进回程相对误差(根据用户需要给出)。 注1:指示q, b,“用于测力机定级时参考,除非用户需要一般不据此给出符合与否的评定。 注2:不带括号的级别为优先推荐采用的级别。 JJF 1134- 2005 4.4 附加功能 A)测力机的其他附加功能如峰值保持、示值锁定、报警、控制、绘图、输出、打印及通讯等作用时,其工作性能应能满足说明书和相关试验方法标准的要求。 B)测力机的其他性能指标如时间、长度、速度等的校准应根据说明书和相关技术标准的要求进行。 5 校准条件 5.1 环境条件 A)温度:(10--35)` C,校准过程中温度波动不大于2'C o B)湿度:< 80 % RH. C)其他条件:校准时不得有影响校准结果的外观缺陷及振动、电磁场或其他干扰源。 5.2 力标准器 5.2.1 根据测力机的规格和结构形式正确选用相应量程的标准测力祛码、标准测力杠杆、标准测力仪作为校准测力机的力标准器。 5.2.2 建议用于校准测力机的力标准器计量特性见表3o 表3 力标准器技术指标 6 校准项目和校准方法 6.1 校准项目 JJF 1134-2005 测力机的校准项目见表40 表4 ON力机的校准项目序号校准项目说明 1 相对分辨力 / 2 回零相对误差 3 示值算术平均值校准报告上仅给出其中之一及相应不确定度 4 示值相对误差 5 示值重复性相对误差 / 6 示值进回程相对误差根据用户需要给出 6.2 校准方法 6.2.1 第4.1条基本要求的检查通过目测和操作的方法进行。 6.2.2 第4.2条安全保护性能的检查通过目测和操作的方法进行。 6.2.3 满足第4.1条、第4.2条要求后进行第4.3条计量特