Pmod ISNS20

[Francoisb24]

Hi everybody,

I recently bought a pmod isns20 and I have problems with reading values on AC current (230V 50Hz). It returns random values. But in DC current it returns good values.

I recover the values through spi with an arduino micro.

I tried all the combinations of the jumps to change filtering or sampling frequency but nothing good ...

Could you help me ? Is there someting special to for for measuring AC currents ?

Thanks in advance !

Best regards

[JColvin]

Hi @Francoisb24,

What magnitude of current are you expecting to measure with your AC current and can you provide some additional information on what you mean by random values? With this particular chip (ACS722LLCTR-20AB), the sensitivity is 66 mV/A and with no current flow, the measured voltage (representative of no current for a bi-directional output) should be approximately 1.5V.

As for the jumpers, you will likely want both jumpers enabled to set the sampling rate to 120 Hz.

Let me know if you have any other questions.

Thanks,
JColvin

[Francoisb24]

The resistor for the test used 3.17 Amps continuously. (I measured with a multimeter during the test and the current is stable)

I didn't measure the output of the particular chip, I'll do that.

I linked an excel sheet with the received values (taken every 500ms)

Thanks

 

 

mesure courant isns20.xlsx

[JColvin]

Hi @Francoisb24,

I don't have an AC current provider on hand, but I will see if I can look further into this.

Thanks,
JColvin