Than you all that reply to my question.

Here is an example:
12 patterns were energized with 15 VDC and the current of every individual
were measured with following results (in nAmps):
7.90; 1.71; 6.80; 1.23; 3.00; 2.63; 2.90; 1.04; 7.60; 1.54; 3.90; 1.87.
Equivalent resistance been (in GOhms):
1.90; 8.77; 2.21; 12.20; 5.00; 5.70; 5.17; 14.42, 1.97; 9.74; 3.85; 8.02.

Arithmetic mean:
Arithmetic mean of resistances is 6.58 GOhm.
Arithmetic mean of currents is 3.51 nA and equivalent resistance is 4.27
GOhm.

Geometric mean
Geometric mean of resistances is 5.36 GOhm
Geometric mean of currents is 2.80 nA and equivalent resistance is 5.36
GOhm.

Three different results and only one of them is right.

Scope of this example was only to present different methods for calculating
the average resistance of a sample in SIR-testing -nothing more ore less.

B.R.

Jarmo Kiiski

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