Maintenance and commissioning of protection relays: CMC 256plus

Maintenance and commissioning engineers regularly have to test protection relays as well as calibrate measurement transducers, energy meters, and power quality devices. For protection relays, testing on site is common practice, whereas the other devices in many cases are sent to a laboratory for calibration, resulting in considerable efforts and costs. In order to cover all test applications and all calibration tasks on site with a single instrument, reliability, powerful output characteristics and outstanding precision must be combined in one instrument.