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10µA range - 1.4 pA
100uA range - 24 pA
1 mA range - 127 pA
range 10 mA - 647 pA
These are excellent numbers around 0.1 ... 0.2ppm
Measure the current with shorted inputs:
10µA range - 33nA (3300ppm !!!)
100 uA range - 330nA (3300ppm !!!)
1mA range - 3.3mkA (3300ppm !!!)
10mA range - 28mkA (2800ppm !!!)
These figures are possible in the presence of thermal EMF = 33 µV at the input (28 µV for the last range)
And this is not a thermo emf jumper. After measuring the DCV, I see nanovolts.
This is something internally.
Moreover, this displacement does not create any problem if we measure the "current source".
But it creates problems when measuring the current that generates a voltage source and series resistance. And a two-year error of 20 ppm we get at a voltage of just 1.65V and less. Unfortunately, I have nothing to test this hypothesis.
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