A precision phase angle meter in 50Hz or 60Hz version, the 597C has been in production for well over 10 years. It has inputs for voltage, direct current or current via a clipon CT.
The phase angle can be measured to 0.1deg accuracy over a wide range of voltage from 10V to 500V, and from 50mA to 50A using the direct current input.
The clipon CT option gives current measurement up to 500A with slightly less accuracy.
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