Pressure/Vacuum Rate Calibrators
There are two different types of calibration standards: a Primary Standard and a Transfer Standard. A primary standard measurement is made using fundamental components (mass, length, time, etc.). Primary standard calibration devices are typically used and maintained by the metrology or calibration laboratory within an organization. The laboratory can then either directly calibrate the production instruments or calibrate instruments that will be used as transfer standards for calibration of the production instruments.
A transfer standard is a secondary device that is traceable to a national laboratory or other recognized standards body (e.g.NIST1). Transfer standards are used in both laboratory and production environments.