Hi. I did this today using CL390 KLEIN TOOLS clamp multimeter. While set to 40A position, it reads 00.03 ~00.04 when not clamped to any source . When I clamped it around the ex cord while pump running, it read 00.12 ~ 00.13. When I plugged the pump to dedicated outlet, it read 0030 ~00.40 and...