Instrument Transformer Lab Testing

The COM5003 Reference Standard is part of the ZERA/Powermetrix high precision measuring instrument series. With the highest accuracy of 0.005 % (50 ppm), the COM5003 presents its new innovative digital technology and extended features for measurement. As a primary standard, the COM5003 is designed for testing current and voltage meters as well as single- or three-phase power and energy meter testing systems. This precise technology is especially useful in metrological institutes, official utility lab applications, and other environments for energy suppliers or manufacturers of electric meters and designed for integration of existing systems. All operation, measurements and data visualizations can be viewed using by the COM5003’s simple user interface and 9“ touchscreen.

The current measuring comparator WM3000I is a high-precision device for comparing secondary outputs from a current transformer under test (or digital output of Electronic CTs or Digital CTs) with a reference signal supplied by a standard transformer primary. The resulting error value will be displayed as ratio error and phase error on the screen. The operation of the comparator will be performed via an integrated 10.1” capacitive touch screen or controlled by PC software. The WM3000I is compatible with existing systems, like Knopp, and exports a data output for active database systems.