# What is ten point height method? - Metrology & Quality Control

Q.  What is ten point height method?
- Published on 07 Aug 15

a. It is the average sum of ten highest points measured within sampling length
b. It is the average difference of five highest points and five deepest valleys measured within sampling length
c. It is the sum of ten highest points divided by sum of ten deepest valleys measured within sampling length
d. It is the average sum of five highest points and five deepest valleys measured within sampling length

ANSWER: It is the average difference of five highest points and five deepest valleys measured within sampling length

#### Discussion

• Sravanthi   -Posted on 26 Oct 15
- Different methods to specify roughness values are follows:

1) Peak-to-valley height method
2) Root mean square method
3) Centre-line-average method.

- Ten point method is used to overcome the difficult of peak-to-valley method.

- Peak-to-valley method sometimes gives same maximum peak to valley values for two different textures and hence becomes an disadvantage.

- This disadvantage is averted by by using a ten point height method.

- In ten point height method, the average difference between five highest and five deepest valleys for same sample length is measured within the profile from a line parallel to mean line.

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