PPK2 accuracy

RE: PPK2 accuracy

haakonsh — Tue, 28 Feb 2023 09:23:49 GMT

You should not need to add 2% of 200nA, but by all means add +/- 4nA.

RE: PPK2 accuracy

Julien S — Tue, 28 Feb 2023 08:30:41 GMT

Thank you,
What are the test conditions ? i.e. how large is the set of measurement to achieve the 10% accuracy (simply your internal oversampling or 1s or 60s mean value) ?

Can you please confirm the reading is :

100nA +/-10nA

1µA +/-0.1µA

10µA +/- 1µA

Or do I need to add 2% of something ?

RE: PPK2 accuracy

haakonsh — Mon, 27 Feb 2023 19:49:02 GMT

[quote user=""]For lowest range (100nA-50µA), what is accuracy ? Do I understand correctly it is “10% of reading + 2% of 50µA” ?[/quote]

No, the R1_Offset is the accuracy of R1_Resol, ie. +/- 2% of 200nA. R1_Resol is one ADC lsb.

R1_Accuracy is the total measurement accuracy of the average of a large set of measurements.

RE: PPK2 accuracy

Julien S — Fri, 24 Feb 2023 15:35:39 GMT

When you have 200nA resolution you can't have 10nA accuracy

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_ppk2%2FUG%2Fppk%2Fppk_measure_accuracy.html

Most meter will announce %of reading + %of range or %or reading + N x lastReadingDigit
But normally range is presented as a single number meaning 50µA not like a real range 100nA-50µA

The information is misleading, that's why I want an official confirmation

RE: PPK2 accuracy

droidecahedron — Fri, 24 Feb 2023 15:01:25 GMT

I recently used the PPK2, and my interpretation of that sheet was the following:

In the range of 100 nA to 50 uA, expect a +- 10% accuracy with a +-2% offset

So 100 nA +/- 10nA for accuracy

and it could be offset by +/- 2nA

for 1uA following same logic,

1 uA +/- 0.1uA, with up to 0.02 uA of offset.

I would also like this confirmed.