Non invasive AC current sensor: how to connect it to the circuit?

Other Hardware Sensors
1

Hello,

I have this quite common non invasive AC current sensor (30A version). There's a tutorial here but I don't understand how to connect the sensor because it has a 1/8 (3.5mm) TRS output. The spec sheet tells the two extreme contact points are "output" and the middle point is "vacancy".

2

Use the two extreme contact points as the output.

3

Yes, they are the only pins between which I can measure a resistance. However it is strange because I have 37.5 ohms instead of 62 ohms as stated in the spec sheet.

4

Are you not measuring RL in parallel with the secondary coil of the meter and hence see a lower value ?
Bear in mind this is an AC output too, you cannot connect this directly to an Arduino and must use some form of bias circuit as shown in the example .

5

amundsen:
Yes, they are the only pins between which I can measure a resistance. However it is strange because I have 37.5 ohms instead of 62 ohms as stated in the spec sheet.

I reckon the 62 ohms is the burden resistor, the 37.5 is the burden resistor in parallel with the secondary,
which is an uninteresting parameter as the secondary acts as a current source and its resistance is immaterial.