Using the Type 1 Gauge Study to Assess Measurement Capability

Reading time ( words)

Measurement capability is a critical aspect of ensuring product quality, therefore a measurement system must be assessed before being used on products. Understanding how to assess measurement capability becomes critical. The Type 1 Gauge study is typically the first step in a measurement system analysis program. Type 1 Gauge parameters are explained, and a worked example using electroless nickel immersion gold (ENIG) is provided.

What Does the Type 1 Gauge Study Do? There are two major types of measurement system variation:

1.  Accuracy is variation between the measurement and a true or reference value

2.  Precision is variation between repeated measurements

A Type 1 Gauge study involves repeated measurements of one sample by one gauge and by one operator. With this information, the

Type 1 Gauge study provides an assessment of the following:

1. Accuracy, assuming a reference value is available 

2. Precision of repeated measurements

Without an accepted reference value, the Type 1 Gauge study only measures precision, and accuracy becomes unavailable. Bias is a quantitative term used to describe accuracy. Bias is the difference between the average of measurements made on the reference value and its true value.

A Type 1 Gauge study considers only the inherent variation of the gauge itself. A Type 1 Gauge study isolates the effects of accuracy and precision, and evaluates the capability of the gauge to make accurate measurements with acceptable variability. A Type 1 Gauge study does not assess operator-to-operator or gaugeto-gauge variation. A more complex gauge repeatability and reproducibility (R&R) study is indicated for a more comprehensive measurement system analysis.

To read this entire article, which appeared in the July 2016 issue of The PCB Magazine, click here.


Suggested Items

Uncovering the Electronics Ecosystem

04/08/2022 | Nolan Johnson, I-Connect007
Nolan Johnson speaks with Will Marsh, vice president of TTM Technologies and president of the Printed Circuit Board Association of America, about the work the PCBAA has been doing in Washington, D.C., to get the industry better recognized by the country’s decision-makers. Marsh is optimistic, not only about the companies and individuals joining the effort, but in the recognition by Capitol Hill to secure the nation’s defense systems.

Catching up With Schaltbau’s Jim Tullo

09/24/2021 | Dan Beaulieu, D.B. Management Group
As the electric vehicle market expands, it is useful to hear from someone with a goal of creating a significant position in that market. Schaltbau Group is one of those companies. In fact, one might say because of its string position in the rail marketplace, the company has been dealing in EVs for years. I sat down recently with Jim Tullo, president of Schaltbau’s North American operations, to talk about their current and future business. I strongly advise you to dig into this one.

I-Connect007 Editor’s Choice: Five Must-Reads for the Week

04/02/2021 | Nolan Johnson, I-Connect007
The Top 5 is labeled as “editor’s choice,” which is a good thing this week because if I were limited to just posting the five most viewed news items, this week’s list would be full of our own coverage for IPC APEX EXPO. Judging from the metrics, that content has been extremely popular.

Copyright © 2022 I-Connect007 | IPC Publishing Group Inc. All rights reserved.