I have the ACS372 100A 5V board. It exhibits a large asymmetry in the output. If I flow a current in one direction, the calculated sensitivity is 23mV/A. If reverse the current direction, it’s 18mV/A. Are the sensors degaussed before they’re shipped? I have several more sensors. I hate to have to test them all before using them in a circuit. Any suggestions?
Hello.
We do not do any degaussing as part of our production and are not aware of that being applicable to these sensors. We tested some here and saw some asymmetry with the output, but not as much as you are observing. Can you post some pictures of your setup that show all of your connections and wiring? What are your actual voltages and currents?
- Patrick
can’t post photos since I took down the test setup. Setup details: sensor powered by a lab power supply set to 5.00V. A separate 12V battery, sharing the ground with the lab supply, powered a test load consuming 5.00A - measured with a Fluke clamp-on and a Fluke in-line (set to 10A). Both Flukes showed 5.0A. A third Fluke was used to measure the Vout from the sensor.
0A → 2.505V Vout
+5A → 2.620V
-5A - 2.414V
I realize that the current too low for the sensors range. Will repeat with higher currents.
forgot to mention that the sensor was on the low side (negative line) of the load.
Thanks for the additional details. Yes, please let us know your results when you test it with higher currents.
- Patrick