Electronics > Projects, Designs, and Technical Stuff
Need help: spikes in current measurement signal conditioning circuitry
balage:
I have not forgotten to write here, but the meeting on this topic has not happened yet. The guy I've mentioned will come soon.
However in the meantime the device is operating good and without any problem.
T3sl4co1l:
Common mode noise. What you are seeing is most likely not in the circuit itself, but introduced by the probe.
Does the circuit have ground planes?
Tim
balage:
Actually the system has two isolated parts, one is tied to the power line (here is the Hall-sensor, signal conditioning, etc...) and the other part is isolated from the power line. This isolated part has the OrangePi and some digital circuits. So the whole system is floating, the power line ground is not connected anywhere.
Finally it has turned out the spikes are fake ones, kind of picked up transients by the probes. However it is still hard to decide what is fake and what is real transient in such a circuit.
T3sl4co1l:
Weird, if it's all line referenced then why use a higher noise, lower accuracy hall effect sensor?
Tim
balage:
Because up to 50 amps needs to be measured. No way to use a shunt.
After the signal conditioning circuitry it is much better.
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