# Voltage output of AC current clamp

So I'm using a Fluke i200s current clamp in combination with an oscilloscope to measure the AC current. Normal current clamps have a current output, but this one has a voltage as output. Now my question is does this clamp has the same working principle as the others(like a transformer with one primary winding), and just measures the voltage instead of the current. Or does this clamp works differently, and how?

• Have you tried reading the documentation? Commented Sep 27, 2017 at 12:55
• It probably just has a precision shunt built in. Commented Sep 27, 2017 at 13:00
• Yes I did @PlasmaHH this is from the instruction sheet: Output level(s) 100 mV/A 10mV/A Commented Sep 27, 2017 at 13:04

• Yes. Your oscilloscope has a 1M input impedance. If the current transformer tried to push 10 mA through that, for example, the voltage would have to rise to $IR = 1M \cdot 10m = 10 \ \mathrm kV$. You don't want that. The 'scope inputs are voltage inputs, not current. A resistor is a perfect current to voltage converter! Commented Sep 27, 2017 at 14:00