The Measure of Quality
Product News


  • Calibration is the high-level, controlled and documented process of measuring traceable calibration standards over the full operating range of the instrument or probe, and verifying that the results are within the stated accuracy. Calibrations are performed by the manufacturer, their authorized agent, or by an accredited calibration laboratory in a controlled environment using a documented process.
  • DeFelsko Corporation does not provide expiration dates on Calibration Certificates issued with our handheld inspection instruments. Several non time related factors have shown to be more critical in determining calibration intervals. These factors are primarily the frequency of use, the application in question, as well as the level of care taken during use, handling and storage. For example, a customer that uses the gage frequently, measures on abrasive surfaces, or uses a coating thickness instrument roughly (i.e. drops the instrument, fails to replace the cover on the probe tip for storage, or routinely tosses the instrument into a tool box for storage) may require a relatively shorter calibration interval.
  • From both theoretical analysis and practical experience, the impact of temperature and moisture on the instrument is very minimal. In addition, manufacturing processes are designed to minimize post calibration changes in instrument performance. Drift in coating thickness instrument measurement is typically linear and is thus compensated for prior to use by the “zero” function of the instrument. For this reason the amount of time the instruments remain on the shelf (both before purchase and between use) has little significance.
  • With these factors taken into consideration, DeFelsko recommends that our customers establish the instrument calibration intervals based upon their own experience and work environment. Based on our product knowledge, data and customer feedback, a one year calibration interval from either the date of calibration, date of purchase, or date of receipt is a typical starting point.
  • The transfer to a digital design in the latest version of the PosiTector® series has enabled us to move all of the measurement electronics and functionality from the gage body to small circuit boards within the probe. For this reason, the gage body is now a basic power source and display that has no impact on the instruments function or calibration.
  • To address this change, it was necessary to identify the probe as the true instrument calibrated by our Calibration Lab. That is why the Calibration Certificate now displays the serial number for the probe and not for the gage. Historically we have had customers fail Quality Audits because they chose to mix and match gages, resulting in a gage-probe combination that did not match the Certificate of Calibration.
  • For most of our customers and dealers this is an additional selling feature because it not only allows complete interchangeability between gage-probe combinations, but it also facilitates sending solitary probes back for calibration or repair, allowing them to continue with their measurement processes if they have multiple probes.
  • One final recommendation for companies with only one gage body and one probe is to use the probe serial number for both as it is by far the most critical. Then the unit can be treated as one instrument with full traceability through the serial number engraved on the probe.
  • It is more economical to trade-in Standards for a new set. Trade-in reduces the price of new Standards by 20%.

    Certified Standards should be replaced whenever they become visibly worn or scratched.



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