3 Stupid things that can wreck an otherwise excellent calibration

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Janice Bennett-Livingston
Mar 12th 2013
Industrial Measurements
Life Science
Science & Sensing Technologies

This week's blog comes from our calibration and repair department:

The top three calibration issues listed below aren’t new problems, but in our experience, they are definitely issues we have to be diligent about.

  1. Not looking at the Customer requirements
  2. Transcription Errors
  3. Inadequate checks of your reference standards
 

Not looking at the Customer’s Requirements:

Unfortunately, this happens. Sometimes, if the device has built-in memory where the information exists, you can take a step back and adjust to the original calibration. But, with most instruments, once you’ve adjusted, you can’t go back. Nightmarish situation, especially if you are also failing at Stupid Thing #3.
 

Transcription Errors:

Any manual process comes with the risk of human error. It’s easy to put the decimal in the wrong spot. There are two main safeguards: 1. Put checks in place. Look at the results carefully to see if they are realistic, and, 2. Automate processes as much as you can to eliminate data entry.
 

Inadequate Reference Standard Checks:

Obviously, reference standards drift too. The quality of your standards depends on your knowledge of the uncertainties of the device – the type of instrument, how susceptible it is to drift, your own operating environment, etc. Measurement and calibration are simply not meaningful without understanding the measurement uncertainties of your standard.
 

Resources:

Here’s a good presentation from the government of Hong Kong’s Innovation and Technology Commission. A nice refresher course: “Evaluation of Measurement Uncertainty.” Also, a good document out of the UK: “The Expression of Uncertainty and Confidence in Measurement” from the United Kingdom Accreditation Service.
 
Thanks to YouTube, we can barely comment on uncertainty without referencing the immortal words of the great MIT Physics 8.01 instructor, Professor Walter Lewin.
 
Do you have your own favorite CE that I have missed? Email us!

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Author

Janice Bennett-Livingston

Marketing Manager

In addition to editing the Vaisala Life Science blog, Janice Bennett-Livingston is the Global Life Science Marketing Manager for Vaisala's Industrial Measurements business area.

Pre-Vaisala writing credits include a monthly column called "Research Watch" for Canada's award-winning magazine alive, as well as articles in Canadian Living and other periodicals. Other past work: copywriting for DDB Canada, technical writing at Business Objects, and communications specialist for the British Columbia Child & Family Research Institute.

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