Posts By: Harwood Engineering

Primary vs Secondary Standards

Posted by & filed under News.

Pressure testing equipment calibration is important in ensuring that you collect accurate and reliable data through your work. While different devices and systems will require different calibration techniques, all calibration depends on either a primary or secondary (otherwise known as “transfer”) standard. But what, exactly, is the difference between primary vs secondary standards?

A 150,000 PSI Dynamic Pressure Calibrator

Posted by & filed under Technical Papers.

This technical paper describing the methods, concepts, and operation of a 150,000 PSI dynamic pressure calibrator was originally written in October of 1987. All tests were performed by the US Army Ballistic Research Lab at the Aberdeen Proving Ground in Maryland.    Abstract: A positive step pressure generator suitable for the dynamic calibration of ballistic pressure […]