供应商最低能力要求NCA-1-003GB ED.2 070521.docVIP

Standard Code: NCA-1-003 Prior code: Title: Measurement system variation study for gauges Edition : 2 Language: GB Security classification : UNCLASSIFIED Page.: PAGE 1 of : NUMPAGES 5 Date: 21/05/2007 Translation version: 0 íNDEX TOC \o \n 1.0 OBJECT 2.0 SCOPE 3.0 DEFINITIONS 4.0 OPERATIVE METHOD 4.1 Variation Study 4.2. Analysis of Results 4.3. Determining Accuracy 4.4. Determining Stability 5.0 ANNEXES 1.0 OBJECT This standard defines the minimum requirements for gauges approval (new and refurbished gauges) in terms of capability within Gamesa and Suppliers. 2.0 SCOPE This Standard is applicable for gauge variation studies of gauges used to validate production parts within Gamesa and its suppliers. 3.0 DEFINITIONS The following definitions describe the types of error or variation associated with measurement systems and equipment. 3.1. Accuracy: The accuracy is the difference between the observed average of measurements and the true average of the same characteristic on the same part. 3.2. Repeatability: The variation in measurements obtained when one operator measures several times the same unit, using the same instrument and techniques on the same parts. 3.3. Reproducibility: The variation in the average of measurement made by different users, or the same user in different locations, using the same gauge while measuring the same identical characteristic on the same part. 3.4. Stability: This variation refers to the difference in the average of at least two sets of measurements obtained with the same equipment on the same parts taken at different times. 4.0 OPERATIVE METHOD The main objectives of performing measurement system and equipment capability studies are: To provide a basis for acceptance of new measurement systems and equipment. To perform an ongoing process control system for existing measurement equipment. To evaluate measurement equipment with suspected performance deficiencies. These will also result in bette