The Artemis can run as low as 6μA/MHz meaning the module can run at 48MHz at less than half a milliamp. To enable measurements and to isolate the power hungry devices (such as the LM317 voltage regulator) we've added a NC (normally closed) jumper. By cutting the jumper the VDD trace to the module is interrupted. Soldering in a male jumper or wires into the accompanying holes will give you the ability to insert a current meter and precisely monitor how much current your application is consuming.