# Can I create my own good reading in µA?

This multimeter is in between a Rpi0 3.3V pin and a BME280 sensor VCC. Most of the time the sensor is sleeping. You can see on the picture, the reading is 620µA, which seems high. Now if I use the range mA the reading is around 0.16mA. From this question (A really basic question about ammeters and their ranges) should I conclude to not use the µA range from this multimeter? Or is there a way to mitigate the shunt knowing both range reading?  Edit 2 sensor datasheet: Edit 3 circuit: Black Crocodile to COM and red crocodile to INPUT of multimeter. The red wire doing an arc above the Raspberry pi 0 was not plugged to the 3.3V pin at the time of the picture. • Can you put a large plastic RF cap across the meter. And repeat measurments? Jul 15, 2021 at 16:01
• I have 0.1µF around, I guess not large enough. I can find bigger. What do you mean by 'across the meter'?
– user291059
Jul 15, 2021 at 16:20
• Schematic and data sheets required. Jul 15, 2021 at 17:49
• If you're worried about the burden of the ammeter, you might trust the higher scale reading more than the more sensitive scale reading - even though % error is larger. Jul 15, 2021 at 21:14
• 0.1 & 0.01 uF in parallel. Jul 16, 2021 at 0:16

The numbers you are seeing on the meter may be just the result of its inherent inaccuracy. The meter error is specified as $$\\pm(1.0\% + 7)\$$, where the "7" means a count of 7 in the least-significant digit.
If you are on the $$\400\,\mu\text{A}\$$ range the meter's accuracy is $$\\pm 4.7\mu\text{A}\$$. The error increases by a factor of ten as you increase the range by a factor of ten. On the $$\40\,\text{mA}\$$ range the error is $$\\pm 0.47\,\text{mA}\$$.
I think your measurements are just noise on the $$\\text{mA}\$$ range. If you are measuring $$\620\mu\text{A}\$$ then you must be on the $$\4000\,\mu\text{A}\$$ range, and the inaccuracy of that value is $$\\pm 47\mu\text{A}\$$.