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校准证书

UKAS认可的证书

UKAS校准证书As a UKAS accredited calibration Laboratory No. 0256, Norbar is required to calibrate torque measuring devices that are within the Laboratory’s scope, in accordance with BS 7882:2017. The laboratory is accredited for torques between 0.005 N·m and 108,500 N·m.. See the 'UKAS Schedule of Accreditation'. Norbar can provide a comprehensive range of calibrations including increasing and decreasing torques; clockwise and counter-clockwise; in either SI or Imperial torque units, or in mV/V or Volts. The sections below summarise the main features of BS 7882:2017, but purchase and careful study of the standard is advised for those who wish more detailed information.

  • The “device” is defined as all parts of a system, e.g. Display, Transducer Cable, and Transducer. Transducer cables will therefore be serial numbered if they are separate items.
  • 设备的输出定义为“挠度”。
  • 最好一起校准系统的所有部分。如果将传感器发送用于校准而没有正常显示单元,则将使用实验室中保存的等效校准显示。正常显示也必须处于校准状态,否则传感器的认证是无效的。
  • 诺巴(Norbar)目前是唯一获得乌克萨斯州(UKAS)校准电扭矩测量指标的实验室。
  • 在进行任何校准或重新校准之前,扭矩测量设备连续预加载了三次,直至设备的最大施加扭矩。将每个预紧力保持在1到1 1/2分钟之间,以锻炼设备并将其稳定在校准固定装置中。
  • The device is calibrated with at least five approximately equal steps from 20% to 100% of maximum torque. Lower values are allowed as long as they meet certain criteria for resolution.
  • 对于0.05和0.1级,必须在四个不同的安装位置上校准扭矩测量设备,每个安装位置在测量轴上旋转90º。对于所有其他类别,该设备的校准至少两个不同的安装位置至少相隔90º。
  • Two series of readings are taken, and the device is then disturbed, generally by being disconnected from the calibration fixture and rotated through 90º. The device is then preloaded once to full scale. A third series of readings are then taken. This process is repeated until readings have been recorded in all required orientations.
  • 如果需要可逆性,则在最后一个增加的序列结束时应用一系列减少扭矩。
  • 如果在两个方向上都需要校准,则一系列读数将在相反的方向上重复。
  • 然后分析校准数据以建立以下参数。

可重复性

从系列1和2中指定的挠度之间的变化表示为两个读数的平均值的百分比。

Reproducibility

系列1、2和3或系列1、2、3、4和5之间的最大变化表示为从系列1、3或系列1、3、4和5计算得出的平均指示偏转百分比。

指示错误

如果结果以扭矩单位表示,则适应症的误差是每个读数和该扭矩的所有三个系列的平均读数之间的变化。

零扭矩的误差

每个加载序列后记录的最大零读数表示为最大平均值偏转的百分比。

插值误差

Where the results are expressed in volts or units other than torque units, a 2nd order polynomial (best fit line) is established and the difference in deflection from the computed value is expressed as a percentage of the computed value.

可逆性

The variation between the readings from the last torque series applied in an increasing mode and the readings for the same given torque applied in a decreasing mode. Reversibility is expressed as a percentage of the deflection of the last increasing series for the given torque.

分类

  • 将参数与表格的表进行比较,以建立设备的分类。0.05类是最高的性能,5类是标准定义的最低。报告的整个类别将是性能最低的参数。例如,当所有其他参数符合0.5类时,可重复性可能是1类。该设备将分类为1。
  • 此外,应用扭矩的不确定性必须是报告的整体类别的五倍。Norbar的测量不确定性(通常为0.02%)允许分类为0.1类设备。
  • 可能会引用低于最大容量的20%的范围的不同类别。
  • 根据ISO6789:2017 cl可追踪的校准auses.
  • 符合ISO 10012,用于ISO 9001质量系统。
Air Pressure Graph
  • 气压图显示需要气压与扭矩。
  • Pressure and torque both measured on traceable equipment.
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