Electronics > Beginners
Using ADS 10115 and Micro Current Gold.
Kleinstein:
For reduced noise one should ideally run the ADC continuously and average as many results to get a multiple of 20 ms (16.6 ms in the US). Taking a reading every 20 ms is not as effective in 50/100 Hz suppression. With continuous reading the filter frequency can be higher and thus faster settling is possible.
When making you own board one could include the input amplifier - so no need to combine it with an extra µCurrent board. For small currents and currents with a lot of spikes one may have to use some filtering early one at the shunt / measuring resistor, to avoid hitting a limit at times even if the average current is well within the range. A TIA instead of shunt + amplifier may have some advantage here as it can use a smaller cap.
A good ground plane can be good for RF effects and reduce EMI problems. However once a ground plane is cut to pieces it is more like an EMI problem than helping. So the often seen ground fill is more like a poor excuse - it may work, but it could also fail.
For high precision or very low cross talk it is better to use defined ground traces than a ground plane, at least for the critical part.
The µCurrent cares more about µV stray voltages then EMI - so it does not use ground fill.
With a µC one kind of has to think about both EMI from the µC and care about stray currents / ground loops. So one may use a ground pane for the µC part only.
iMo:
The ADS1015 has got differential inputs handy, that may help as well - in DS there is a design example of reading a low side shunt + OPA333 + filter + ADS1015.
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