What is Poison test for visual inspector?

Poison test

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In the manufacturing industry, when a product is made,  a lot is prepared, after the lot is ready, its lot is inspected, during the inspection some defective pieces come out which our quality inspector checks. We do a Poison test to check the quality inspector's ability to receive defects. Poison test is not done daily it is done on monthly basis without informing the inspector.

Poison test 

Poison Test is done for Visual Inspector. Visual inspectors to check the quality of our product can really vary like in the in-process and PDI stages. And all our inspectors should be covered for this test. We do a Poison Test to find out if the Visual Inspector can remove the Defective pcs from the OK pcs. It is a periodic test for visual Inspector qualification. Poison tests we use to check the capability of our Quality Inspector.

Why do we do Poison Tests?

To test If inspectors can identify all defective parts mixed with ok parts. It is a periodic test for visual inspector qualification

In which stage do we do the Poison test?

1. Incoming Inspection

2. In-process Inspection

3. Final or PDI Inspection

Mainly Poison test is done in the Final or PDI inspection.

Poison test Process step. 

1. Arrange 5 parts NG and 45 Parts OK and mix both OK and NG part, or as per your SOP or WI. Lot size should be from 20 to 100 parts.

Note:- (1) It is done for an attribute or visual inspection

2. Give identification mark on NG parts so you can easily identify NG parts, remember don’t tell about identification mark to a visual inspector.

3. Give this mixed lot to visual inspection for segregation.

Note:- Visual inspector unaware of this process

4. After segregation verifies the parts and record them in the poison test report. If the inspector found all defective parts mixed then OK, if he is not found

5. all NG parts mixed then take further action.

(a) Give training to Inspector, in Training format and record it.

(b) After training, Take again test on Next Day,

6. Do a Poison test of a visual inspector as per your organization's SOP.

Generally, it is done every month and all inspectors should cover it. Poison test frequency should be written in the poison test plan.

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