ACCURATE 4 POUND WEIGHT HOW TO
ACCURATE 4 POUND WEIGHT VERIFICATION

While test data that support this 5lb claim are unavailable, it is not relevant to this paper, and therefore, will not be challenged herein.Д®nd user verification must include a requirement for electrode flatness for consistent and accurate electrode performance because, over time, the rubber electrode may harden, warp, or become damaged. In addition, the lack of calibration of the 5lb weights could be due to calibration facilities not having a calibration procedure, as the procedure is proprietary and typically done by the manufacturer.ДЄdditionally, the origin of the 5lb requirement is not clear i.e., why not 4lb or 8lb? The best answer the authors were able to obtain was that it takes five pounds of weight to provide enough downward force to enable consistent and repeatable measurements. Because these characteristics are often overlooked, users may not realize that the weight is out of calibration, and, therefore, fail to have it calibrated.ДЄnother often overlooked property is that of the 5lb weightвЂ™s polymer padвЂ™s flatness, which, when uneven, will cause the 5lb weight to tilt. The user may regard the 5lb weight merely as a weight, thereby unintentionally neglecting its electrical characteristics and the fact it will degrade over time. Why do 5lb weights rarely get calibrated? Data generated from the authorsвЂ™ testing of multiple 5lb weights are provided in the appendices.ДЄ. The authors examined five test methods, explained in detail here and summarized in Table A.

This paper discusses performance requirements and test procedures to validate compliance based on the test parameter limits identified within the standards previously listed.

ACCURATE 4 POUND WEIGHT HOW TO

This paper describes the methods that the authors utilized for making these measurements and proposes adopting these procedures as a process for verification that may be used in place of a calibration requirement.Дespite the importance of the 5lb weights to an ESD CP, there has been little discussion on how to formally calibrate these weights. The performance requirements for the 5lb weights include weight, conductivity, and flatness of its polymer pad. The intent of this paper is to describe a verification procedure to validate the 5lb weightвЂ™s performance to the ESD Association (ESDA) and the American Society for Testing and Materials (ASTM) requirements as described in ANSI/ESD STM4.1/STM7.1 and ASTM F150. The 5lb weight is one of the most used tools for verifying EPA compliance to a local ESD Control Program (CP). The 5lb weight has many uses, including providing enough weight atop a concentric ring for accurate and repeatable measurements of materials it provides enough weight for measuring surface grounding and resistance of worksurfaces, stools/chairs, floors, and garments. 5lb Weight with Electrode Polymer Pad on Bottom.

These 5lb weights double as both a weight and as an electrode this document will henceforth refer to this tool as a 5lb weight (Figure 1).ДЇigure 1. Proper verification of an Electrostatic Discharge (ESD) Protected Area (EPA) relies heavily on the use of the National Fire Protection Association (NFPA) 5lb weights. Monroe, iNCE, NASA Langley Research Center, Hampton, VAД«ob Vermillion, CPP, Fellow, iNCE, RMV Technology Group, LLC, NASA Ames Research Center, CA

Accurate 4 pound weight