Below are general answers on how to operate, maintain, and calibrate a hardness tester from the list of GAO Tek’s hardness testers. To facilitate our customers to a selection of our products, we have further classified our hardness testers by their features: alarm, auto-recognition-of-impact-device, data-storage, installable-software, multi-angle-testing, preset-limit-settings, thermal-printer, user-material-function and pen-type. 

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Operating a hardness tester: 

Preparation: 

  • Ensure the surface is clean and smooth. 
  • Select the appropriate test method (Rockwell, Brinell, Vickers). 
  • Choose the suitable indenter and test load based on material. 

Setup: 

  • Securely place the specimen under the indenter. 
  • Adjust the focus and position of the indenter. 
  • Zero the GAO Tek’s tester according to the manufacturer’s guidelines. 

Testing: 

  • Initiate the test cycle; the indenter penetrates the material. 
  • Measure the indentation accurately using a microscope or automatic measuring system. 
  • Record the readings for further analysis. 

Analysis: 

  • Convert the indentation size to hardness using the appropriate formula. 
  • Consider factors like material type, temperature, and specimen thickness. 

 

Maintaining a Hardness Tester: 

Regular Inspection: 

  • Check for any signs of wear or damage. 
  • Inspect the indenter and anvils for cleanliness and defects. 

Calibration: 

  • Follow the manufacturer’s recommended calibration schedule. 
  • Use certified hardness reference blocks for accuracy. 

Cleaning: 

  • Keep the tester clean from debris and contaminants. 
  • Use approved cleaning agents for sensitive components. 

Lubrication: 

  • Lubricate moving parts as per the manufacturer’s guidelines. 
  • Ensure proper functioning of the loading system. 

 

Calibrating a Hardness Tester:  

Prepare Equipment: 

  • Ensure the GAO Tek’s tester is clean and free from debris. 
  • Verify the tester is at the recommended operating temperature. 

Select Calibration Standard: 

  • Choose a certified hardness standard of known value. 
  • Ensure it matches the material type and hardness range of your typical samples. 

Place Standard on Tester: 

  • Carefully position the calibration standard on the tester’s platform. 

Perform Test: 

  • Follow the standard operating procedure for your specific tester. 
  • Make sure the indenter is correctly aligned and apply the test load. 

Record and Compare Results: 

  • Note the hardness value obtained from the calibration standard. 
  • Compare it with the known value of the standard. 

Adjust if Necessary: 

  • If there’s a discrepancy, adjust the tester according to the manufacturer’s instructions. 
  • This may involve tweaking settings or applying corrections. 

Repeat Calibration: 

  • Perform multiple calibration tests to ensure consistency. 
  • If adjustments are made, repeat the process until accurate readings are obtained. 

Document Calibration: 

  • Record the calibration results, adjustments made, and the date of calibration. 
  • Maintain a calibration log for future reference and audit purposes. 

Regular Maintenance: 

  • Schedule regular calibration checks, adhering to the manufacturer’s recommended intervals. 
  • Keep the tester and indenter clean to prevent inaccuracies.Â