You need to set the probe up as PICO_CONNECT_PROBE_CURRENT_CLAMP_200_2KA as this will provide the power to the clamp and then chose a range as one of PICO_CURRENT_CLAMP_200A_2kA_1A = 4000, PICO_CURRENT_CLAMP_200A_2kA_2A, PICO_CURRENT_CLAMP_200A_2kA_5A, PICO_CURRENT_CLAMP_200A_2kA_10A, PICO_CURRENT ...