2010/5/10 Ruben J=F6nsson : >> >> Be sure to measure Vin on the circuit side of any Iin ammeter. >> Be aware that high frequency power supply noise on power wiring (in >> and out) can play havoc with some meters). Largish cap (100 uF?) >> across meter terminals can help. >> >> -- > > Since the noise most likely is in the 100s of MHz range, a smallish cap p= erhaps > would be better. A ferrite clamp can also help. > Somehow I think you and Russell must be speaking differently with regard to the meaning of "noise". Maybe you and Russell can clarify. -- = Xiaofan http://mcuee.blogspot.com -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist