Current Measure using Current Transducer

[adimon]

Hi,

I am trying to measure the energy consumption of a PC system in a high resolution and sample rate (to measure the effect of different algorithms on the power consumption). The expected current should be under 2.3A (550W/230V='power rating of power supply'/'wall power').

I ended up buying a ARM Energy Probe Measuring Card (https://www.farnell.com/datasheets/1728565.pdf) and a CR4110S-20 Current Transducer (https://www.crmagnetics.com/Assets/ProductPDFs/CR4100_Series.pdf) which I want to use to measure non-invasive on the power supply cable of my PC.

The Current Transducer should transform 0-20AAC to 0-5VDC with a linear transformation (x4). Nevertheless, with a multimeter I'm measuring values in the range of 0,00XV. Even stranger, when using the Measuring Card the voltage oscillates between 0V and 1,5V independently if the cable I measure is under power or not.


I'm new in this domain. Does anyone have an idea for troubleshooting?

Thanks in advance,
Adrian

 

[FvM]

The current transducer doesn't work if you place the multi wire power cable in the core. The field of L and N wire are cancelling out. Place either L or N wire.

 

[Easy peasy]

that is quite funny ...