JJF(冀) 240-2024 点线规校准规范

河

北

省

地

方

计

量

技

术

规

范JJF(冀)

240—2024点线规校准规范Calibration

Point-Line

Gauge2024

-

09

-

发布 2024

-

10

-

实施

发

布Calibration

Specification

For

Point-Line

Gauge

JJF(冀)

240—2024归

口

单

河北省市场监督管理局主要起草单位：

保定市计量测试所参加起草单位：

长城汽车股份有限公司苏立民（保定市计量测试所）刘 刘 洋（长城汽车股份有限公司）参加起草人：张 李红杰（保定市计量测试所）张会青（长城汽车股份有限公司）鹿 帅（长城汽车股份有限公司）姚建博（保定市计量测试所） ········································································································（

） ···································································································（

1

） ·····························································································（

1

） ···································································································（

1

） ·····························································································（

1

） ······························································································（

1

） ···························································································（

1

） ···························································································（

2

） ·····························································································（

2

） ···························································································（

2

）

···············································································（

2

）

··············································································（

2

） ···························································································（

2

） ························································································（

2

） ·····················································································（

2

） ·····················································································（

3

） ····················································································（

3

） ·······················································································（

4

）

点线规圆直径校准结果测量不确定度评定（示例）·······························（

5

）

点线规线纹间距校准结果测量不确定度评定（示例）····························（

7

）

····························（

9

）

································································（

11）

···························································（

12）

点线规校准方法补充

·······································································（

13）I JJF

JJF

JJF

II 本规范适用于由线和圆组成点线规的校准。 JJF

《测量仪器特性评定》。 的点、划痕的面积、直径、宽度、长度来确定外观缺陷，主要用于汽车行业。PET材料制成，上刻有圆直径、线纹间距和线纹宽度，其型式见图图

1 点线规示意图 1-6MPE±(1μm

+10×10

，相对湿度不大于

表

1 表

1 校准用设备及其计量性能

图

2 圆直径校准 2 万能工具显微镜调整同

b(x’,y’)

图

3 线纹间距校准

𝐿

√(𝑥

𝑥′2

(𝑦

𝑦′2 依次校准带数字刻度的线纹间距。

端，在线纹刻线长度方向分别采集刻线两端和中心

图

4 线纹宽度校准

，即为校准结果。 使用同样的方法依次校准其它线纹宽度。

3）校准单位校准专用章；的校准人、核验人、批准人签名及签发日期； 根据点线规使用情况及稳定性，复校时间间隔由用户自行决定，建议不超过

4测量次数12345678910测量值（mm）2.00922.00292.00512.00502.00152.00542.00812.00232.00612.0053冀)

240—2024附录

A点线规圆直径校准结果测量不确定度评定（示例） 𝑑𝑤

𝑑𝑐𝑑𝑐mm𝑑𝑤mm 𝑢1(𝑑)2mm圆刻度重复测量表

A.1 重复性测量结果√3

表

A.1 重复性测量结果√3

0.6μm

(𝑑𝑘

𝑢1(𝑑)

𝑠

√∑𝑛𝑘=1𝑛−1−𝑑̅)2

2.5μm

万能工具显微镜最大允许误差为±

+10×102mm=±1.02μm√3𝑢2(𝑑)

1.02 点线规与万能工具显微镜温度差引入的标准不确定度分量𝑢3(𝑑)𝑢3(𝑑)

0.0μm 校准时温度偏离标准温度时，由点线规和万能工具显微镜热膨胀系数不同引𝑢4(𝐿)PET-6/℃𝑡

√3∆𝛼

=

(60−10.2)×10−6/℃

5不确定度分量不确定度来源标准不确定度𝑢1(𝑑)测量重复性2.5μm𝑢2(𝑑)万能工具显微镜0.6μm𝑢3(𝑑)点线规与万能工具显微镜温度差0.0μm𝑢4(𝑑)偏离标准温度时热膨胀系数不同0.3μm𝑢𝑐合成标准不确定度2.6μm冀)

240—2024𝑢4(𝑑)

∆𝛼

𝑢4(𝑑)

∆𝛼

𝑡√3

0.3μm

(60−10.2)×10−6℃

5℃表

A.2表

A.2 标准不确定度汇总 𝑢𝑐

√𝑢1(𝑑)2

𝑢2(𝑑)2+𝑢3(𝑑)2

𝑢4(𝑑)2

2.6μm 𝑈

𝑘

𝑢𝑐

2.6

5.2μm6测量次数12345678910测量值（mm）80.019080.013080.015480.014480.015280.015480.016980.013280.016680.0133冀)

240—2024附录

B点线规线纹间距校准结果测量不确定度评定（示例） 𝐿𝑤

𝐿𝑐𝐿𝑐——被测点线规长度的测量结果，𝐿𝑤——万能工具显微镜两点坐标间距离， 𝑢1(𝐿)在重复性条件下，使用万能工具显微镜对80mm线纹间距重复测量次，测量结果见表

重复性测量结果√3

表

重复性测量结果√3

1.1μm

(𝐿𝑘

𝑢1(𝐿)

√∑𝑛𝑘−1𝑛−1−𝐿̅)2

1.9μm

万能工具显微镜最大允许误差为±

，当被测量为时，万能工具=±1.8μm，符合均匀分布，取√3𝑢2(𝐿)

1.8 点线规与万能工具显微镜温度差引入的标准不确定度分量𝑢3(𝐿)𝑢3(𝐿)

0.0μm 校准时温度偏离标准温度(20时，由点线规和万能工具显微镜热膨胀系数不同引𝑢4(𝐿)PET-6/℃𝑡

±

k√3∆𝛼

=

(60−10.2)×10−6/℃7不确定度分量不确定度来源标准不确定度𝑢1(𝐿)测量重复性1.9μm𝑢2(𝐿)万能工具显微镜1.1μm𝑢3(𝐿)点线规与万能工具显微镜温度差0.0μm𝑢4(𝐿)偏离标准温度时热膨胀系数不同1.4μm𝑢𝑐合成标准不确定度2.7μm冀)

240—2024𝑢4(𝐿)

𝑢4(𝐿)

∆𝛼

𝑡√3

1.4μm

√3

𝐿

(60−10.2)×10−6℃

5℃表

表

标准不确定度汇总

𝑢𝑐

√𝑢1(𝐿)2

𝑢2(𝐿)2+𝑢3(𝐿)2

𝑢4(𝐿)2

2.7μm 𝑈

𝑘

𝑢𝑐

2.7

5.4μm8测量次数12345678910测量值（mm）2.22002.21352.21342.21642.21422.21602.21852.21342.21572.2130冀)

240—2024附录

C点线规线纹宽度校准结果测量不确定度评定（示例）C.1 C.2 𝐻𝑤

𝐻𝑐𝐻𝑐被测点线规线纹宽度的测量结果，mm𝐻𝑤mmC.3 C.3.1 C.1表

重复性测量结果√3

表

重复性测量结果√3

0.6μm

C.2(𝐿𝑘

𝑢1(𝐿)

√∑𝑛𝑘−1𝑛−1−𝐿̅)2

2.4μm

C.1万能工具显微镜最大允许误差为±

+10×10=±1.022μm√3𝑢2(𝐻)

1.022C.3.3 点线规与万能工具显微镜温度差引入的标准不确定度分量𝑢3(𝐻)恒温时间，认为被校点线规与万能工具显微镜温度一致。𝑢3(𝐻)

0.0μmC.3.4 校准时温度偏离标准温度(20时，由点线规和万能工具显微镜热膨胀系数不同引𝑢4(𝐻)PET-6/℃𝑡

±√3∆𝛼

(6010.2)−6时：𝑢4(𝐻)

∆𝛼

𝑢4(𝐻)

∆𝛼

𝑡√3

0.4μm

C.3

(60−10.2)×10−6℃

5℃

9不确定度分量不确定度来源标准不确定度𝑢1(𝐻)测量重复性2.4μm𝑢2(𝐻)万能工具显微镜0.6μm𝑢3(𝐻)点线规与万能工具显微镜温度差0.0μm𝑢4(𝐻)偏离标准温度时热膨胀系数不同0.4μm𝑢𝑐合成标准不确定度2.6μm冀)

240—2024C.4 C.2表

表

标准不确定度汇总C.5

𝑢𝑐

√𝑢1(𝐻)2

𝑢2(𝐻)2+𝑢3(𝐻)2

𝑢4(𝐻)2

2.6μmC.6 𝑈

𝑘

𝑢𝑐

2.7

5.2μm10