# Measurement of current with hall effect sensor

I have a setup using 3 hall effect current sensors and my goal is to measure the DC current flowing through cables. The sensors are HSTS016L. I attached a picture of the manual. The sensors have 4 pins GND, +5V, Vref and Vout. The Vref are constant for all 3 sensors but they are not exactly the same values for all 3 (2499.7mV, 2509.7mV and 2507.2mV). The Vout decreases when the amount of current in the cable increases. So for example: Sensor 1: @2,7A Vout is 2464,6mV and @5,5A is 2371,9mV My first question is what should I be measuring? the voltage between Vout and the ground or the voltage between Vref and Vout? The second question is how to determine the amount of current flowing in the cable? Is the only way by making reference measurements for each sensor?

• I'd say that V[ref] is the reference voltage for 0A. So the output would best be compared to V[ref] instead of assuming a fixed 2500mV. Notice that the sensors can sense AC, so by turning them around you can get increasing V[out] for increasing DC current; might be easier to handle. Jul 2, 2019 at 11:53