FAQ - Frequently Asked Questions

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  • No : 7502
  • Date of Issue : 2021/12/06 10:05
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(HMV) If the standard value of a hardness test piece does not agree with the test results

(HMV) If the standard value of a hardness test piece does not agree with the test results
HMV-G30, HMV-G20
HMV-G31, HMV-G21
HMV-G31-FA, HMV-G-FA
HMV-G31-XY, HMV-G-XY
Category : 

Answer

Possible Causes:
1. Effects of vibrations
  Vibrations will have a significant effect at test forces of 98.07 mN or less. Ensure that the area around the instrument is free of vibrations before performing the measurement.
 
2. The indenter tip is too close to the sample.
  The indentation will be too big if the indenter tip is too close to the sample. See "If the tip of the indenter is too close to the sample".
  Clich here for "(HMV) If the tip of the indenter is too close to the sample".
 
3. Problem with the length measurement instrument.
  See "Replacing and Adjusting the Objective Lens"
  Click here for "(HMV) Replacing and Adjusting the Objective Lens". 

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