Meter testing device for testing electric meter, has secondary power source and switching unit connected to primary power source with free-wheeling power line or with testing port and secondary power source having free-wheeling power line

摘要

The meter testing device has a testing port (60) for an electric meter (40 to 44) to be tested, and a primary power source (10), which is connected to the testing port. A secondary power source (11) and a switching unit (50) are connected to the primary power source with a free-wheeling power line (30) or with the testing port and the secondary power source having a free-wheeling power line. The switching unit comprises a switch (20), which is connected with an output of the primary power source. An independent claim is included for a meter testing method for testing an electric meter.