Topic: Gage R&R Study On New LCR Measurement System Software
Speaker: Joshua Stanford, Primary Standards Laboratory, Sandia National Laboratories (SNL)
A Gage R&R study helps to determine the repeatability and reproducibility of a measurement system. Repeatability describes how much variability in the measurement system is caused by the measurement device and/or software. Reproducibility describes how much variability in the measurement system is caused by differences between operators. This process assists with verifying and validating current, and new measurement systems and software.
The Gage R&R can determine where the majority of variation occurs during the measurement process. This variation can arise from specific parts, different operators, and the interaction between parts and operators. A common standard of repeatability and reproducibility is a measurement system’s variation being less than 10% of the process’s variation.
To complete a Gage R&R study, multiple operators measure multiple parts of the same value during multiple trials. Several calculations are performed to determine the R&R of the measurement system. The analysis of variance method (ANOVA) is the most accurate method for quantifying repeatability and reproducibility. In addition, the ANOVA method allows the variability of the interaction between the appraisers and the parts to be determined.
Attendees will learn how to perform a Gage R&R and determine where variation of a measurement system arises.
Topic: Traceable High-Frequency Vibration Calibration of Accelerometers in the Temperature Range of -60°C to 90°C
Speaker: Randy Mendoza, Primary Standards Laboratory, Sandia National Laboratories (SNL)
The determination of accelerometer response to temperature variation is well understood in terms of accelerometer design. However, traceable calibration of accelerometers under extreme temperature conditions, particularly at higher frequencies, is a unique challenge. The Primary Standards Laboratory at Sandia National Laboratories, in conjunction with SPEKTRA, has recently implemented a sinusoidal vibration calibration system for the traceable calibration of accelerometers from 10 Hz to 10 kHz in the temperature range of -60°C to 90°C. This presentation includes the following: a brief overview of vibration calibration theory, a description of the calibration system and its configuration, an approach for determining the temperature coefficient of a back-to-back reference standard accelerometer, and a summary of improvements on existing capabilities and measurement uncertainties.
Understand traceable vibration calibration at extreme temperatures.