Tester to check consumer electricity meter

摘要

The present invention relates to a tester (3) for checking errors of a consumer electric supply meter (2) comprising a camera (4), scanning and evaluation units (31, 32, 36), further a computation unit (34), input memory and current circuits (35), a circular buffer (37), an internal memory (38) and an optoelectronic sensor (5). The tester of the present invention detects fault in the measurement of the electric supply meter (2) by comparing data obtained directly from the electric supply meter (2) and instantaneous data from the circular buffer (37).