The Tektronix AM503B Current Probe Amplifier also provides the Hall Effect Device bias voltage and a reverse "bucking" current that resists saturation of the A6312/A6302/A6303 Current Probe core.
The Tektronix AM503B amplifies and sums the voltage outputs from the transformer and Hall Effect device and outputs it to the measurement instrument.
An additional significant improvement with the AM503B is that individual A6312/A6302/A6303 probes no longer need to be calibrated with a specific amplifier but can be interchanged between AM503Bs and AM5030s.
The AM503B and the AM5030 both support the XL Series of current probes. The AM503 and the AM503A do not support the XL Series. The AM503B operates in any TM500/TM5000 power module. The 50 O output of the AM503B can be displayed on any oscilloscope or measure.