Adapter for use in testing an energy meter

An adapter (200, 300) for coupling a three-port meter to a three-phase meter test board, the adapter comprising:

• a first interface for coupling to the three-phase meter test board;
• a second interface for coupling to the three-port meter;
• first and second conductive elements (205a, 205b, 305a, 305b) for coupling first and second a-phase current source terminals (230a, 230b, 330a, 330b) of the first interface to a first line port terminal (220a, 320a) and a first load port terminal (220c, 320c) of the second interface respectively;
• third and fourth conductive elements (205c, 205d, 305c, 305d) for coupling first and second c-phase current source terminals (230c, 230d, 330c, 330d) of the first interface to a second line port terminal (220b, 3200b) and a second load port terminal (220d, 320d) of the second interface respectively;
• a fifth conductive element (205e, 305e) for coupling a first distributed energy resource (DER) port terminal (220e, 320e) of the second interface to a second DER port terminal (220f, 320f) of the second interface;
• and
• sixth and seventh conductive elements (205f, 205g, 305f, 305g) for coupling first and second b-phase current source terminals (230e, 230f, 330e, 330f) of the first interface to the first and second terminals of the line port (220a, 220b, 320a, 320b) respectively or to the first and second terminals of the load port (220c, 220d, 320c, 320d) respectively.