The AM503 is a Current Probe Amplifier. The AM503 Current Probes convert the DC and AC flux field of a conductor to a voltage signal which is sent to an AM503B or AM5030 Amplifier. The probes include both a Hall Effect device, which senses the DC current, and a ferrite transformer which senses the AC current. The probes also utilize a bucking current from the Amplifier, which eliminates core saturation. The bucking current for the A6302XL is 20 A, 100 A for the A6303XL and 500 A for the A6304XL. A total of six current probes are available for use with the AM503B and AM5030 Current Probe Amplifiers. Since all six probes are of the split-core mechanical design, they easily clip on and off of a conductor. All the probes provide simultaneous DC and AC current measurements with a wide range of current amplitude and bandwidth capabilities.