Because i can add in series another capacitor that i know the exact value and then get the first cap value.
Even so, the inaccuracy of the device does not disappear.
What I mentioned above.
If you want to measure a small value 0.03 nF capacitor whose true value you do not know.
And you connect a 1nF capacitor "in
parallel" with it.
Then if everything is with 0% tolerance, it should be 1.03nF.
But due to the measurement inaccuracy of the instrument, you can measure here. ±(0.0515nF+0.02nF) that is
1.03nF-0.0715nF = 0.9585nF
and
1.03nF+0.0715nF = 1.1015nF
value between
But you won't be able to calculate from this how much the smaller 0.03nF capacitor is.
Since the inaccuracy is related to the measured values in %, if you try the same thing as described above with an 8nF, the inaccuracy will be greater, because of course the 5% of the 8nF is much larger than that of the 1nF.
With the 20 count inaccuracy, I don't understand why they didn't cut off the last, smallest digit and write 2 count instead.
I apologize if it is difficult to understand, I struggle a lot with google translate