I'm trying to pick a CT-clamp for measuring low currents 0-500mA. I know I could buy a residual current sensors built for that, but I limit my research to "aliexpress"-clamps for $ reasons. My Shelly EM can reliably read 10mA current with cheap 80A clamp, so it is doable.
I see that the same sensor can be labeled 5A/2.5ma or 100A/50ma, so the only "real" value I find is primary/secondary turns ratio.
I was expecting that difference in same series of sensors would be just the number of turns, but reading data table from manufacturer gives me doubts.
These values don't make much sense to me, also there is no linearity. Just errors?
I was thinking that low turns and high value burden resistor would be best for my purpose, but not so sure anymore.
What are the factors for low current range?
How high I can go with burden?
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