Is there any sensor available to measure dc current from 0-100mA contactless?
Contactless is the problem, looked for some sensor half effect but they are for very high currents only
Need more information. What are the physical constraints? What resolution? What accuracy? Cost constraints?
What research have you done so far?
my projects: https://github.com/epccs
Why do you need a Hall? Maybe use an analog isolator
They use a coil around the sensor (loop the current round & round) to increase the sensitivity (you can do the same with a standard sensor).
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Does "contactless" imply that you need to be able to measure without disconnecting the wire to put it through a core (and then reconnect)?
Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net
1. should be contactless, cannot disconnect wire or break it.
2. Accuracy is +-1mA or even 2mA can also work.
3. https://www.crmagnetics.com/Assets/ProductPDFs/CR5200%20Series.pdf have some solution for upto 2Amps.
Looking for some cheaper solution though,
What price do you consider cheap?
Is the current ac or dc? What frequency?
What output? Analog or digital?
Give us a decent specification please - we shouldn’t need to ask a zillion questions.
half effect ... are for very high currents only
Oh no they're not!
These babies are spintronic!
Looks like this solves the purpose : https://www.lem.com/en/ctsr-03p
1. its contactless
2. can measure -300mA to +300mA with 1.9% accuracy.
can connect 16 bit adc and oversample it for better measurement.
do anyone else ever used their product, its reliablity?
LEM stuff is usually very good - they're at the more premium end of the market. As for using a 16bit adc - look at the noise specs. You're probably not going to get better than 10 bits worth out of this sensor.
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