A method of and apparatus for calibration of instrumentation and provision of calibration certificates comprises a portable field operable communication device (11) and a remote information management (12) device in wireless communication with one another, a data store comprising information related to each instrume...

A system for use in determining the active power used in an electrical circuit is provided. The system includes an electrical circuit comprising both reactive and resistive components, and a digital processor connected to the electrical circuit, the digital processor configured to collect synchronized samples of ...