The input impedances of the PA2201A are as follows:
Voltage: 2 MΩ + 12.5 pF
2 A input: 60 mΩ + 0.10 µH
50 A input: 6 mΩ + 0.06 µH
External transducer: 100 kΩ + 100 pF
Refer to the data sheet at www.keysight.com/find/PA2201A for up to date information.
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