Single and multi-level continuous sampling procedures and tables for inspection by attributes
Some standard content:
National Standard of the People's Republic of China
Single and multi -level continuous sampling procedures and tables for Inspection by attributesUDC $11.213.2www.bzxz.net
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GB 8052—87
This standard is applicable to the inspection of continuously submitted work-in-progress products. When this standard is cited in the quality regulations of the order contract, product technical standards, process documents and other documents, the provisions specified therein must be implemented. The application of this standard can control the average quality of the product within the specified average outgoing quality upper limit (AOQL). The following conditions must be met when using this standard:. Work-in-progress products (see 1, 1.2).
b. There are sufficient places, equipment and personnel near the inspection point to quickly conduct 100% inspection when necessary. Relatively easy and fast inspection.
The quality of the production process and raw materials is stable (see 3.1.2, 4.1.2a and 5.1.2a). d.
The inspection is non-destructive.
1 Terms and symbols
1.1 Terms
1.1.1 Unit product
The basic unit of inspection object for the purpose of continuous sampling inspection. 1.1.2 Work in progress
The unit product that is passing through the inspection point includes finished products, semi-finished products, core components, raw materials, data or other physical objects. For example, the product passes through the inspection point on a conveyor belt or production line, or is loaded in a tote, truck or other handling equipment that is loaded and unloaded manually or by machine.
1.1.3 Sample list
The unit product that is randomly selected from the production line for inspection. 1. 1.4 Nonconformity
A unit product that does not meet the technical requirements specified in the product technical standards, process specifications and drawings is called nonconformity. Non-conformity is classified according to the importance of the technical requirements of the unit product quality, or the severity of the non-conformity to the technical requirements. Generally, non-conformity is divided into: Class A non-conformity, Class B non-conformity, and Class C non-conformity. 1.1.4.1 Class A non-conformity
If the extremely important technical requirements of the unit product quality do not meet the regulations, or the unit product does not meet the technical requirements very seriously, it is called Class A non-conformity.
1.1.4.2 Class B non-conformity
If the important technical requirements of the unit product quality do not meet the regulations, or the unit product does not meet the technical requirements seriously, it is called Class B non-conformity. 1.1. 4,8 Class C non-conformity
If the general technical requirements of the unit product quality do not meet the regulations, or the unit product does not meet the technical requirements slightly, it is called Class C non-conformity.
Approved by the National Bureau of Standards on July 8, 1987
Implemented on April 1, 1988
1.1.5 Nonconforming products
GE B052—87
A unit product with one or more nonconforming items is called a nonconforming product. According to the type of nonconforming products, they can generally be divided into: Class A nonconforming products, Class B nonconforming products, and Class C nonconforming products. 1.1.5.1 Class A nonconforming products
A unit product with one or more Class A nonconforming items, and possibly also Class H and (or) Class C nonconforming items, is called a Class A nonconforming product.
1.1.5.2 Class B nonconforming products
A unit product with one or more Class B nonconforming items, and possibly also Class C nonconforming items, but not including Class A nonconforming items, is called a Class B nonconforming product.
1.1.5.3 Class C nonconforming products
A unit product with one or more Class C nonconforming products, but not including Class A and Class B nonconforming products, is called Class C nonconforming product. 1.1.6 Acceptable quality level
In sampling inspection, the upper limit of the average nonconforming rate of the process that the manufacturer and the user agree can be accepted. In the sampling plan, it corresponds to a quality level with a predetermined relatively high acceptance probability (usually 89%-99%). 1.1.7 Limit quality
In the sampling plan, it corresponds to a certain and relatively low acceptance probability (usually 10%). When expressed as a nonconforming rate, it is called the process tolerance nonconforming rate. 1.1.8 Average pick-out quality (average detection nonconforming rate) The average quality of the product after inspection. All nonconforming products found in the inspection must be replaced with qualified products. 1.1.9 Upper limit of average outgoing quality
The maximum value among all possible values of average outgoing quality. 1.1.10 Average inspection ratio
The average defective rate of a specific process, the ratio of the number of products inspected to the total number of products over a long period of time. 1.1.11 Production interval
The time interval divided into a continuous production process for sampling inspection. Usually one piece production shift. If there is reason to confirm that the shift change does not affect product quality, it can also be a person, but not more than one person. 1.1.12 Process defective rate
The ratio of the number of defective products in the production process to the total number of products produced. 1.1.13 Average process defective rate
The average defective rate found by the manufacturer during the initial inspection of products within the specified period, that is, the number of defective products found during the inspection
Process average defective rate minus
The total number of products not inspected
determined as defective after the initial inspection. Products that are resubmitted for inspection after repair are not included. 1.1.14 Inspection characteristics of sampling plan
For a specific value of process mean, in long-term production, the number of products that pass during the sampling period accounts for the fraction of the total number of products produced. 1.1.15 Sampling ratio
The ratio of the number of unit products randomly selected and inspected at the inspection point to the number of unit products that pass the inspection point during the continuous sampling inspection period. In this standard, each sampling ratio is expressed as a fraction, such as 177, 1, 25, 1750, etc. 1.1.16 Sampling ratio code
The letter representing the sampling ratio.
1.1.17 Continuous qualified product number
The number of continuous qualified unit products required to be achieved in the 100-ring inspection rejection stage before transferring to sampling inspection. 1.T.18 Re-inspection
The manufacturer shall conduct random inspection on the products that have passed 100% inspection to check the quality of the products during full inspection. Usually, the inspection shall be carried out at the sampling rate f or a higher rate
1. 1. 19 Continuous sampling inspection
GB 8052-8T
When the products pass the inspection point, the unit products shall be inspected and identified. Only the unit products that are considered unqualified during random inspection or full inspection shall be identified. The remaining unit products that have been inspected and qualified shall continue to be transmitted down the production line as qualified products. 1.2 Symbols
AHI: Average inspection rate.
AOQ: Average outgoing quality.
AOQL: Average outgoing quality upper limit.
AQL: Acceptable quality level.
CSP—1: Single level continuous sampling plan rate—. CSP-2: Single level continuous sampling plan II. CSP-T: Multi-level continuous sampling plan.
1: Number of continuous qualified products.
LQ: Limit quality
p: Process non-conforming product rate.
Process level non-conforming product rate.
PLI: P value for reaching AOQL.
S: Upper limit of the number of unit products for full inspection. 2 General provisions for the implementation of sampling plans
2.1 Provisions for acceptable quality level (AQL) The size of AQL shall be determined in accordance with the contract or by the competent authority. For Class A non-conforming products, a very small AQL value shall be used. For Class B non-conforming products, an AQL value larger than that of Class A non-conforming products and smaller than that of Class C non-conforming products may be used. For Class C non-conforming products, an AQL value larger than that of Class A and Class B non-conforming products may be used. AQL together with the sampling ratio code is only used to test the schemes listed in the sampling table, which can also be tested with the corresponding AQL*.
The specified AQL value does not mean that the manufacturer has the right to deliberately supply low-quality unit products. The AQI. values given in the sampling table of this standard are preferred values. If AQL is selected as other values, these tables are not applicable. 2.2 Provision of the upper limit of the average detection quality
The size of the AOQL is stipulated in the contract or determined by the competent authority. The average defective rate of each batch of products received after long-term use of the sampling plan corresponding to the specified AOQL will not exceed this specified A0QI, value. The AOQL value specified in this standard does not mean that the manufacturer has the right to deliberately supply low-quality unit products. 2.3 Submission of products
Although batches are not used to select continuous sampling plans, it is still desirable to establish batches for products after inspection due to the demand for similar products and the convenience of transportation and sales.
Inspection should be carried out in the order in which the products are produced so that the source of quality problems can be found more easily and corrective measures can be taken in a timely manner. In the case where the production order cannot be maintained, for example, before the inspection, products from two or more sample production lines have been mixed, if these products are mixed sufficiently so that the intervals between non-conforming products can be guaranteed to be random during the flow of products, the scheme of this standard can still be applied.
* In this standard, for each AQL value there is a corresponding AOQL value. If either of the two is determined, the other will also be determined accordingly. (See Table 2 A, Table 3 A and Table 4A.)
GB 805287
All submitted unit products must pass through the inspection points in sequence for the required inspections. This does not prevent the manufacturer from inspecting the production process before the products arrive at the inspection points, nor does it prevent the manufacturer from removing or correcting defective unit products before the products are submitted. However, this pre-process inspection should not change the random flow of products during the subsequent sampling inspection. 2. Acceptance and rejection of unit products
The manufacturer shall provide unit products that meet the contract requirements, and shall determine the sampling plan according to the specified AQL value, and then inspect the unit products to determine whether the products should be submitted to the user. Defective products found during the inspection shall be removed from the production line and isolated. The manufacturer may return the defective products for repair, and they can be resubmitted after repair. If the user accepts these returned products, they can be immediately included in the production line. 2.5 Sampling
In continuous sampling, the sample is a unit product drawn from the production line (when passing the inspection point). Each plan has a determined sampling ratio. The sampling units should be drawn according to the selected sampling ratio so that each unit product has an equal chance of being sampled. The interval between the sampling units can be slightly changed during sampling, and the unit products do not have to be drawn according to strict intervals.
2.6 Sampling plan
The term "sampling plan" used in this standard refers to a specific plan associated with the sampling ratio and the number of consecutive qualified products. 2.6.1 Code
The code is used to calibrate the sampling ratio. Table 1 provides the permissible code based on the number of products in the production range. The appropriate code should be selected after considering factors such as the inspection time required for each product and the productivity. 2.6.2 Types of sampling plans
There are three types of sampling plans in this standard: CSP-1, CSP-2 and CSP-T, which are listed in Table 2A, Table 3A and Table 4A respectively. CSP-I plan is the simplest single-level sampling plan. CSP-2 plan is also a single-level sampling plan, which can provide advance alarm when the full inspector needs to call it. CSPT plan is a multi-level sampling plan. When the product quality is better, the use of CSP.-T plan can reduce the sampling ratio. The manufacturer should select the appropriate type of sampling plan according to the specific situation. 2.6.3 Selection of sampling plan
Select the corresponding sampling plan from Table 2A, Table 3A or Table 4A according to AQL. or AOQL and the selected code. 2.7 Suspension of the inspection process
2.7.1 Excessive inspection period
When the full inspection period is too long (3.3.2, 4.3.2, 5.3.2), measures should be taken to improve the production process, and the user has the right to suspend the acceptance of products. The provisions of 3.3.2, 4.3.2, 5.3.2 do not prevent the manufacturer from taking adjustment measures to improve the production process before reaching the limits specified in the above clauses.
2.7.2 Full inspection invalid
During full inspection (10% inspection), if the re-inspector finds a non-conforming product, the user should be notified and measures should be taken to improve the work quality of the full inspection personnel. During the same full inspection, if the re-inspector finds a second non-conforming product, the manufacturer should take further measures and the user has the right to suspend the acceptance of products. 2. The average non-conforming product rate of the daily process is the average non-conforming product rate P, which provides information on product quality for the manufacturer and the user. When it is less than or equal to the specified AQL, the product quality is considered to be in compliance. Required. If P is greater than AQL or even greater than the P value, the chance of the product passing the inspection is very small, and it is likely that the full inspection cannot be transferred to random inspection. At this time, the manufacturer should take measures to improve the production process. In addition to indicating the defective rate of products produced in the previous period, the process average defective rate p can also be used to calculate the corresponding AOQ, AF1 and OC values, or to compare with the PL values in Appendix C Table C1, Table C2 and Table C3 and the LQ values in Appendix D Table D1, Table D2 and Table D3.
Number of products in the production interval
9 ~ 25
26 ~ 90
of1 ~ 50 0
501～1200
12013200
320110 000
10001~35000
35 001 ~150 0 0O
1500 and above
3CSP—1 plan
GB 8052-87
Table 1 Sampling ratio code
Allowed code
CSP→1 is a single-level continuous sampling plan, which provides a conversion procedure between full inspection and sampling inspection. The number of such conversion procedures is unlimited. When a non-conforming product is found during the sampling inspection. CSP-1 requires returning to full inspection. Figure 1 is the inspection procedure of CSP-1, and Tables 2A and 2B list the parameters related to the procedure. Book, 1 Implementation of the procedure
3.1.1 Start of inspection
At the beginning of the inspection, the full inspector checks each unit product that passes the inspection point one by one, and the re-inspector re-inspects the unit products that have been inspected and qualified by the full inspector at a ratio/or at a higher ratio (see 3.3.1). 3.1.2 Sampling inspection| |tt||When all the following conditions are met, it will be converted to sampling inspection: 8. All unit products are produced under stable production conditions according to the same drawings and specifications. This requirement, called consistency, can usually be met under the following conditions, that is, there are no major changes in the production process, raw materials, production methods and production tools (excluding normal replacement due to tool wear), and there is no production stoppage (excluding normal production stoppage after the end of shifts, days and weeks). b. During the full inspection, the full inspector found that at least 10 consecutive unit products were qualified products. ℃, the re-inspector did not find any unqualified products in the consecutive qualified products inspected by the full inspector. When the sampling inspection begins, stop the full inspection and proceed to proportional sampling, that is, one is selected from every 10 unit products (comprising a section).
5.1.3 Resume full inspection
If one or both of the following conditions occur at the same time, stop the sampling inspection and resume full inspection. The production process is interrupted for more than three working days, or the conditions of 3.1.2 are not met. a.
bh. A nonconforming product is found during the sampling inspection. When the full process is required to be resumed, the product flow rate should be slowed down until the full inspector can start the full inspection. The full inspection continues until the conditions of 3.1.2 are met.
3.2 Change of code
If it is necessary to change the sample ratio code, follow the following methods: a: If the result of the code change increases the sample ratio (the number of consecutive qualified products decreases), the code can be changed when the full inspection is transferred to the sample inspection next time, or during the sampling inspection. GB 8052-87
b. If the result of the code change reduces the sampling ratio (the number of consecutive qualified products increases), the code can be changed when the sampling inspection is transferred to the full inspection next time, or during the full inspection. 3.3 Suspension of inspection
3.3.1 Invalidation of gold inspection
As long as the re-inspector finds a defective product among the qualified products inspected by the full inspector, the full inspector shall restart the counting of the continuous qualified products and implement the provisions of 2.7.2. 3.3.2. The full inspection period is too long. During the full inspection period, if the number of consecutive qualified products cannot be reached for many times, and the cumulative total number of fully inspected products since the start of the full inspection has equaled or exceeded the corresponding 3 in Table 2B, and a non-conforming product is found, the manufacturer shall notify the user of this situation and take corrective measures to improve the production process. The user may choose to stop accepting immediately or stop accepting at any time during the subsequent full inspection until the manufacturer eliminates the root cause of the high rate of non-conforming products. After taking effective measures, the full inspection should be restarted. At the beginning, if there are consecutive qualified products of more than 40,000, the sample units shall be proportionately divided into the following sample units. No non-conforming products have been found. 4 CSP—2 plan
Out of the country---qualified products
All products are lost one by one
If the number of consecutive
qualified products is not reached
When the total number of full inspections ≥s
continuous out of specification (qualified products
When the cumulative number of full inspections
an unqualified product appears
stop accepting
Figure CSP [plan inspection procedure
When the total number of required full inspections <8
an unqualified product appears
CSP→2 is a single-level continuous sampling plan, which gives the surface conversion between full inspection and sampling inspection Procedure, the number of measurements of this conversion procedure is not limited. When a defective product is found during the sampling inspection, it is not required to return to full inspection immediately. It is only required to return to full inspection when the first defective product appears in the subsequent i or less sample units. Figure 2 is the inspection procedure of the CSP2 plan, and Tables 3A and 3B list the parameters related to the procedure. 4.1 Implementation of the procedure
4.1.1 Start of inspection
See 3.1.1.
4.1.2 Sampling inspection
See 3.1.2.
8052—87
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If one or both of the following conditions occur simultaneously, the sampling inspection shall be stopped and the full inspection shall be resumed. The production process is interrupted for more than three working days, or the condition of 3.1.2a is not met. b. A second unqualified product appears in 1 or less sample units thereafter. When a full inspection is required, the flow of products shall be slowed down until the full inspector can start the full inspection. The full inspection shall continue until the conditions of 3.1.2 are met.
4.2 Change of code
See 3.2.
4.3 Suspension of inspection||tt| |4.3.1 Full inspection is invalid
3.3.1.
4.3.2 Full inspection period is too long
During the inspection period, if the number of consecutive qualified products cannot be reached for many times, and after the total number of fully inspected products has equaled or exceeded the corresponding value in Table 3B since the start of the full inspection, a non-conforming product is found, the manufacturer shall inform the user of this situation and take corrective measures to improve the production process. The user may choose to stop accepting products immediately or at any time during the subsequent full inspection process until the manufacturer has eliminated the root cause of the non-conforming product rate! Note: After taking effective measures, the full inspection should be restarted. If a new product appears continuously, select sample units according to the ratio and find a qualified station. Continue to sample and charge for unqualified products. After the inspection, the unit will have ten consecutive sample units, all of which are qualified products. Check one by one among all products. If the number of qualified products does not reach 1 in a row, When the full inspection is in progress, there are consecutive (conforming) products. Among i or less than i samples, there is an unqualified product in the unit. When the cumulative number of full inspections is ≥ i, there is an unqualified product. Stop the inspection. Figure 2 Inspection procedure of CS-2 scheme. When the full inspection is in progress, there is an unqualified product. 5 CSP-T Scheme
GB 8052-87
CSP-T is a multi-level continuous sampling scheme, which provides the conversion procedure between full inspection and sampling inspection. When a non-conforming product is found during the sampling inspection process, CSP-T requires returning to full inspection. When it is proven that the product quality is good, the sampling ratio can be reduced. Figure 3 is the inspection procedure of CSP-T, and Tables 1A and 4B list the parameters related to the procedure. 5.1 Implementation of the procedure
Table 3 Values of CSP2 Scheme
AQL (5)
Sampling ratio code
AOQI (%)
Sampling ratio code
5,1.1 Inspection start
5.1.2 Sampling inspection
GB 8052-8T
When the following conditions are met, it will be converted to sampling inspection: CSP
2Scheme s value
AQL (%)
AOQL (%)
Use. All unit products are produced according to the same drawings and specifications under stable production conditions. This requirement, called consistency, can usually be met under the following circumstances, that is, there are no major changes in the production process, raw materials, production methods and production tools (excluding normal replacement due to tooling damage), and there is no production stoppage (excluding normal production stoppages at the end of each shift, day, and week). b. During the enterprise inspection, the full inspector found that at least consecutive unit products were qualified products. e. The re-inspector did not find any unqualified products among the consecutive qualified products inspected by the full inspector. When the sampling inspection begins , stop full inspection and conduct sampling according to the ratio. According to the procedure shown in Figure 3, the sampling ratio is gradually reduced. During the sampling process, the product is randomly selected from the section containing 2 (=0, 1, 2) units of product. 5.1.3 Resumption of full inspection
If one or both of the following conditions occur at the same time, the sampling inspection shall be stopped and full inspection shall be resumed. a. The production process is interrupted for more than three working days, or the conditions of 5.1.2a are not met. . One unqualified product is found during the sampling inspection. GB9052—87
When full inspection is required, the flow of products should be slowed down until the full inspector can start the full inspection. Full inspection continues until the conditions of 5.1.2 are met.
5.2 Change of code
See 3.2.
5.3 Suspension of inspection
5.8:1 Full inspection is invalid
See 3.3:1.
5.3.2 Full inspection period is too long
During the full inspection period, if the number of consecutive qualified products cannot be reached for many times, and the total number of gold-inspected products from the beginning of the full inspection has equaled or exceeded the corresponding s value in Table 4B, and a non-conforming product is found, the manufacturer shall notify the user of this situation and take corrective measures to improve the production process. The user may choose to stop accepting immediately or stop accepting at any time during the subsequent full inspection process until the payer eliminates the root cause of the high non-conforming product rate. After taking effective measures, the full inspection shall be restarted.2.
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4.1.3 Resuming full inspection
GB 8062--87
If one or both of the following conditions occur at the same time, the sampling inspection shall be stopped and the full inspection shall be resumed. Limit. The production process is interrupted for more than three working days, or the conditions of 3.1.2a are not met. b. A second non-qualified product appears in one or less than one sample unit thereafter. When full inspection is required, the flow of products shall be slowed down until the full inspector can start the full inspection. The full check continues until the conditions in 3.1.2 are met.
4.2 Code Changes
See 3.2.
4.3 Suspension of Inspection
4.3.1 Full Inspection Invalid
3.3.1.
4.3.2 Full Inspection Period Too Long
During the inspection period, if the number of consecutive qualified products cannot be reached for many times, and the total number of fully inspected products from the beginning of the full inspection has equaled or exceeded the corresponding value in Table 3B, and a non-conforming product is found, the manufacturer shall inform the user of this situation and take corrective measures to improve the production process. The user may choose to stop accepting products immediately or at any time during the subsequent full inspection process until the manufacturer has eliminated the root cause of the non-conforming product rate. Note: After taking effective measures, the full inspection shall be restarted. Start a new
Continuous
1 qualified product
Sampling according to the ratio||tt ||Sample unit
one
card qualified station
continue sampling and collect
unqualified esters after the inspection of the unit
ten consecutive sample units
are all qualified products
check one by one in all products
do not reach
1 consecutive
qualified products
when the full inspection
consecutive (tt||i) qualified products
there is a
unqualified product in i or less sample
units
when the cumulative full inspection number ≥
one unqualified product
stop
Figure 2CS-2 inspection procedure
when the full inspection is true
one unqualified product
5 CSP-T Scheme
GB 8052-87
CSP-T is a multi-level continuous sampling scheme, which provides the conversion procedure between full inspection and sampling inspection. When a non-conforming product is found during the sampling inspection process, CSP-T requires returning to full inspection. When it is proven that the product quality is good, the sampling ratio can be reduced. Figure 3 is the inspection procedure of CSP-T, and Tables 1A and 4B list the parameters related to the procedure. 5.1 Implementation of the procedure
Table 3 Values of CSP2 Scheme
AQL (5)
Sampling ratio code
AOQI (%)
Sampling ratio code
5,1.1 Inspection start
5.1.2 Sampling inspection
GB 8052-8T
When the following conditions are met, it will be transferred to sampling inspection: CSP
2Scheme s value
AQL (%)
AOQL (%)
Use. All unit products are produced according to the same drawings and specifications under stable production conditions. This requirement called consistency can usually be met under the following circumstances, that is, there are no major changes in the production process, raw materials, production methods and production tools (excluding normal replacement due to tool damage), and there is no production stoppage (excluding normal production stoppage after the end of each shift, day, and week). b. During the enterprise inspection, the full inspector found that at least 10 consecutive unit products were qualified products. e. The re-inspector did not find any unqualified products among the 10 consecutive qualified products inspected by the full inspector. When the sampling inspection begins, stop the full inspection and start sampling according to the ratio. According to the procedure shown in Figure 3, the sampling ratio is gradually reduced. During the sampling process, the product is randomly selected from the section containing 2 (=0, 1, 2) unit products. 5.1.3 Resuming full inspection
If one or both of the following conditions occur at the same time, the sampling inspection shall be stopped and the full inspection shall be resumed. a. The production process is interrupted for more than three working days, or the conditions in 5.1.2a are not met. . A non-conforming product is found during the sampling inspection. GB9052—87
When full inspection is required, the flow of products shall be slowed down until the full inspector can start the full inspection. The full inspection shall continue until the conditions in 5.1.2 are met.
5.2 Changes in code
See 3.2.
5.3 Suspension of inspection
5.8:1 Full inspection is invalid
See 3.3:1.
5.3.2 Full inspection period is too long
During the full inspection period, if the number of consecutive qualified products cannot be reached for many times, and the total number of gold-inspected products from the beginning of the full inspection has equaled or exceeded the corresponding s value in Table 4B, and a non-conforming product is found, the manufacturer shall notify the user of this situation and take corrective measures to improve the production process. The user may choose to stop accepting immediately or stop accepting at any time during the subsequent full inspection process until the payer eliminates the root cause of the high non-conforming product rate. After taking effective measures, the full inspection shall be restarted.2.
8052—87
(%)oy
D2E tE
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000 62
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4.1.3 Resuming full inspection
GB 8062--87
If one or both of the following conditions occur at the same time, the sampling inspection shall be stopped and the full inspection shall be resumed. Limit. The production process is interrupted for more than three working days, or the conditions of 3.1.2a are not met. b. A second non-qualified product appears in one or less than one sample unit thereafter. When full inspection is required, the flow of products shall be slowed down until the full inspector can start the full inspection. The full check continues until the conditions in 3.1.2 are met.
4.2 Code Changes
See 3.2.
4.3 Suspension of Inspection
4.3.1 Full Inspection Invalid
3.3.1.
4.3.2 Full Inspection Period Too Long
During the inspection period, if the number of consecutive qualified products cannot be reached for many times, and the total number of fully inspected products from the beginning of the full inspection has equaled or exceeded the corresponding value in Table 3B, and a non-conforming product is found, the manufacturer shall inform the user of this situation and take corrective measures to improve the production process. The user may choose to stop accepting products immediately or at any time during the subsequent full inspection process until the manufacturer has eliminated the root cause of the non-conforming product rate. Note: After taking effective measures, the full inspection shall be restarted. Start a new
Continuous
1 qualified product
Sampling according to the ratio||tt ||Sample unit
one
card qualified station
continue sampling and collect
unqualified esters after the inspection of the unit
ten consecutive sample units
are all qualified products
check one by one in all products
do not reach
1 consecutive
qualified products
when the full inspection
consecutive (tt||i) qualified products
there is a
unqualified product in i or less sample
units
when the cumulative full inspection number ≥
one unqualified product
stop
Figure 2CS-2 inspection procedure
when the full inspection is true
one unqualified product
5 CSP-T Scheme
GB 8052-87
CSP-T is a multi-level continuous sampling scheme, which provides the conversion procedure between full inspection and sampling inspection. When a non-conforming product is found during the sampling inspection process, CSP-T requires returning to full inspection. When it is proven that the product quality is good, the sampling ratio can be reduced. Figure 3 is the inspection procedure of CSP-T, and Tables 1A and 4B list the parameters related to the procedure. 5.1 Implementation of the procedure
Table 3 Values of CSP2 Scheme
AQL (5)
Sampling ratio code
AOQI (%)
Sampling ratio code
5,1.1 Inspection start
5.1.2 Sampling inspection
GB 8052-8T
When the following conditions are met, it will be transferred to sampling inspection: CSP
2Scheme s value
AQL (%)
AOQL (%)
Use. All unit products are produced according to the same drawings and specifications under stable production conditions. This requirement called consistency can usually be met under the following circumstances, that is, there are no major changes in the production process, raw materials, production methods and production tools (excluding normal replacement due to tool damage), and there is no production stoppage (excluding normal production stoppage after the end of each shift, day, and week). b. During the enterprise inspection, the full inspector found that at least 10 consecutive unit products were qualified products. e. The re-inspector did not find any unqualified products among the 10 consecutive qualified products inspected by the full inspector. When the sampling inspection begins, stop the full inspection and start sampling according to the ratio. According to the procedure shown in Figure 3, the sampling ratio is gradually reduced. During the sampling process, the product is randomly selected from the section containing 2 (=0, 1, 2) unit products. 5.1.3 Resuming full inspection
If one or both of the following conditions occur at the same time, the sampling inspection shall be stopped and the full inspection shall be resumed. a. The production process is interrupted for more than three working days, or the conditions in 5.1.2a are not met. . A non-conforming product is found during the sampling inspection. GB9052—87
When full inspection is required, the flow of products shall be slowed down until the full inspector can start the full inspection. The full inspection shall continue until the conditions in 5.1.2 are met.
5.2 Changes in code
See 3.2.
5.3 Suspension of inspection
5.8:1 Full inspection is invalid
See 3.3:1.
5.3.2 Full inspection period is too long
During the full inspection period, if the number of consecutive qualified products cannot be reached for many times, and the total number of gold-inspected products from the beginning of the full inspection has equaled or exceeded the corresponding s value in Table 4B, and a non-conforming product is found, the manufacturer shall notify the user of this situation and take corrective measures to improve the production process. The user may choose to stop accepting immediately or stop accepting at any time during the subsequent full inspection process until the payer eliminates the root cause of the high non-conforming product rate. After taking effective measures, the full inspection shall be restarted.2 Sampling inspection
GB 8052-8T
When the following conditions are met, it is converted to sampling inspection: CSP
2 S value of the plan
AQL (%)
AOQL (%)
Use. All unit products are produced according to the same drawings and specifications under stable production conditions. This requirement called consistency can usually be met under the following circumstances, that is, there are no major changes in the production process, raw materials, production methods and production tools (excluding normal replacement due to tool damage), and there is no production stoppage (excluding normal production stoppage after the end of each shift, day, and week). b. During the enterprise inspection, the full inspector found that at least 10 consecutive unit products were qualified products. e. The re-inspector did not find any unqualified products among the 10 consecutive qualified products inspected by the full inspector. When the sampling inspection begins, stop the full inspection and conduct sampling according to the ratio. According to the procedure shown in Figure 3, the sampling ratio is gradually reduced. During the sampling process, the product is randomly selected from the section containing 2 (=0, 1, 2) units of product. 5.1.3 Resuming full inspection
If one or both of the following conditions occur at the same time, the sampling inspection shall be stopped and the full inspection shall be resumed. a. The production process is interrupted for more than three working days, or the conditions of 5.1.2a are not met. . A non-conforming product is found during the sampling inspection. GB9052—87
When full inspection is required, the flow of products shall be slowed down until the full inspector can start the full inspection. The full inspection continues until the conditions of 5.1.2 are met.
5.2 Change of code
See 3.2.
5.3 Suspension of inspection
5.8:1 Full inspection is invalid
See 3.3:1.
5.3.2 Full inspection period is too long
During the full inspection period, if the number of consecutive qualified products cannot be reached for many times, and the total number of gold-inspected products from the beginning of the full inspection has equaled or exceeded the corresponding s value in Table 4B, and a non-conforming product is found, the manufacturer shall notify the user of this situation and take corrective measures to improve the production process. The user may choose to stop accepting immediately or stop accepting at any time during the subsequent full inspection process until the payer eliminates the root cause of the high non-conforming product rate. After taking effective measures, the full inspection shall be restarted.2 Sampling inspection
GB 8052-8T
When the following conditions are met, it is converted to sampling inspection: CSP
2 S value of the plan
AQL (%)
AOQL (%)
Use. All unit products are produced according to the same drawings and specifications under stable production conditions. This requirement called consistency can usually be met under the following circumstances, that is, there are no major changes in the production process, raw materials, production methods and production tools (excluding normal replacement due to tool damage), and there is no production stoppage (excluding normal production stoppage after the end of each shift, day, and week). b. During the enterprise inspection, the full inspector found that at least 10 consecutive unit products were qualified products. e. The re-inspector did not find any unqualified products among the 10 consecutive qualified products inspected by the full inspector. When the sampling inspection begins, stop the full inspection and conduct sampling according to the ratio. According to the procedure shown in Figure 3, the sampling ratio is gradually reduced. During the sampling process, the product is randomly selected from the section containing 2 (=0, 1, 2) units of product. 5.1.3 Resuming full inspection
If one or both of the following conditions occur at the same time, the sampling inspection shall be stopped and the full inspection shall be resumed. a. The production process is interrupted for more than three working days, or the conditions of 5.1.2a are not met. . A non-conforming product is found during the sampling inspection. GB9052—87
When full inspection is required, the flow of products shall be slowed down until the full inspector can start the full inspection. The full inspection continues until the conditions of 5.1.2 are met.
5.2 Change of code
See 3.2.
5.3 Suspension of inspection
5.8:1 Full inspection is invalid
See 3.3:1.
5.3.2 Full inspection period is too long
During the full inspection period, if the number of consecutive qualified products cannot be reached for many times, and the total number of gold-inspected products from the beginning of the full inspection has equaled or exceeded the corresponding s value in Table 4B, and a non-conforming product is found, the manufacturer shall notify the user of this situation and take corrective measures to improve the production process. The user may choose to stop accepting immediately or stop accepting at any time during the subsequent full inspection process until the payer eliminates the root cause of the high non-conforming product rate. After taking effective measures, the full inspection shall be restarted.
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