The ASTM E74 uncertainty appendix does not align with ILAC Policy for Uncertainty in Calibration ILAC P-14 which can be a problem for any accredited calibration laboratory. The purpose of this post is to combine the ASTM E74 calibration method, ILAC P-14, and JCGM 100:2008 together to help labs calculate measurement uncertainty per point throughout the loading range with the appropriate coverage factor k to meet their accreditation requirements.
This is part 1 of 4 total blog posts. This post deals with why Force Calibration needs a guidance document. The hope is to expand each of these posts and let them stand on there own to a specific force application.
A torque wrench is one of the most indispensable tools to have in your toolbox. Before choosing the one perfect for your requirement, you need to be aware of the various types of torque wrenches available, their calibration and factors affecting the calibration. All of these points are essential. Let’s take a look at them
This blog analyzes the effects of overshooting a test point and the error of doing so. Various calibration laboratories are using hydraulic, screw, and other force calibration machines where it is difficult not to overshoot a test point. By talking about overshooting a test point we are referring to loading past the desired point and then letting the creep in the hydraulic system naturally decrease the force point. Overshooting the force point to 2543 lbf, when the test point is 2500 lbf and waiting several seconds until the reference standard reads 2500 lbf.
Not choosing a calibration provider who follows published standards, calculates risk properly, and has open communication with customers about the importance of calibrating the instrument, in the same manner, it is used is critical to lessening measurement risk and ensuring the repeatable results. If these steps are not followed OOT (Out Of tolerance) situations are very probably and these are never cheap. Thus we wrote the top 5 costly calibration mistakes for force measurements.
This blog details some of what one would go through to present a tutorial at MSC, or NCSL International. This particular blog is on a Torque Tutorial Morehouse Presented at NCSLI. This is the one course we have been doing off site. Most other training is done at our facility with our equipment.
Tips from the calibration laboratory: How to calibrate button type load cells. Button load cells cause problems during calibration from misalignment to thermal issues. Using the proper adapters can improve the performance of this kind of load cell. This blog demonstrates how to achieve good results while calibrating a button load cell
Tare Load Correction formula proved by performing a test with a proving ring and proving the tare load correction formula TCF = (2c * L * T) - a.
Simple to follow method for adjusting weights for lbf
Morehouse Digital Force Gauges offer high reliability and user-friendliness for a variety of force measurement applications. The instrument features a built-in indicator and can be used to verify test machines, weighing systems, or used to measure applied forces in various configurations. Any Morehouse analog non-low profile gauge can be retrofit to digital.