So, did some more measurements. The PPK2 did arrive in the meantime and shows some slightly different values.
- Previous current measurement with uCurrent and DDM: ~218 uA
- new with PPK2: ~245 uA
To estimate, which of the two might be “more correct”, I looked for some DDM with the ability to measure sub-mA ranges directly:
- directly with current measuring functionality of 4.5 digit DDM at 2000 uA range: ~250 uA
- directly with current measuring functionality of cheap 3.5 digit DDM at 2000 uA range: ~250 uA
So it seams that my uCurrent is a bit off, as the other measurements without the uCurrent show very similar values.
I did now as well probe the LED directly with the oscilloscope and got again ~24 Hz, but a clearly longer pulse duration of ~353 us, which was not visible in the current measurements with the uCurrent.