So I ran into something interesting today.
I have a hall effect sensor (L18PXXXD15) and I was attempting to measure current of a 30Vrms sine wave across a 50 ohm load. However, when I connected my hall effect on the high side, my signal dropped like 10Vrms. When I measured across the current sense pins, I noticed my missng 10Vrms was there. When I increase frequency, the drop increases and when I lower my frequency the drop decreases.
I switched it to the low side, and I'm able to get my full voltage across the laod, as expected.
Generally speaking for hall effect sensors, does placement matter ? I've only messed around with this one sensor, so I can't say if generally all hall effects are required to be low side, or whether it varies.
Is there something in the datasheet that I should look for that might indicate placement ? There was none that I saw for this particular one.