Rapidly fluctuating battery current-draw readings

@Taipan wrote:

I have an Omnibus F4 Pro ver3 FC board ArduPlane V3.9.7 that I am setting up on the bench.

To calibrate the current sensor, I connected a 4.2 ohm/40W resistor where the ESC will be powered. At 12 V, this should draw about 2.8A in addition to the quiescent current (~ 0.5A) - a total of 3.3A.

However, the reading that is displayed in Mission Planner fluctuates rapidly between about 3.1A to 3.5A. When I view the battery current in the log file, this is what I see:

image.jpg1123x598 127 KB

which shows that the current reading is very noisy.

Is this noise due to sampling errors in the F4 ADC?

Is there any way to reduce or eliminate that noise?

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