# Tag Archives: repeatability

• ### 7 Sources of Uncertainty in Measurement for Every Uncertainty Budget

Introduction Have you ever wondered what sources of uncertainty in measurement to include in your uncertainty budget? I have, and I am sure that you have too. Today, I am going to show you 7 sources of uncertainty that should be included in every uncertainty budget. The reason you should include these uncertainty […]

• ### Repeatability is Zero, Here’s What to Do

When Repeatability is Zero Once in a while, you may encounter a scenario where your measurement repeatability is zero. This is common for certain types of measurements, such as: measuring a gauge block with a caliper, placing a calibrated mass on a scale or balance, or calibrating a handheld DMM with a multifunction […]

• ### How to Perform a Repeatability Test 3:

Collecting Data Before you can analyze and evaluate the measurement system and process, you must collect some data. However, before diving in head first, there are some things that should be considered. Review the Plan First, review your plan. If you do not, you may find yourself repeating the experiment. It is more time efficient […]

• ### How to Perform A Repeatability Test 2:

Collecting Data The number of samples collected during experimentation has an effect on the analysis of results and the validity of the test data collected. Over the years, I have observed several conflicting accounts of how many samples one should collect during experimentation. According to many introductory statistics textbooks, the number of samples collected depends […]

• ### How to Perform A Repeatability Test 1:

The evaluation of uncertainty in measurement results is becoming an important requirement for laboratories seeking to attain or retain ISO/IEC 17025 accreditation. When assessors evaluate a laboratory’s uncertainty budgets, they commonly look for the inclusion of type A, or actual test, data. Type A data may include, but is not limited to, evaluations of […]

• ### How To Collect Type A Data for Uncertainty Analysis

From my observations, laboratories are having a difficult time calculating and estimating measurement uncertainty. One of the most common problems that I encounter is laboratories are not performing variability studies (i.e. collecting type A data, Gauge R&R, etc.). As a result, there is very little data to generate confident estimates of uncertainty in measurement results. […]