Hi @Overspeed,
Don't know if I'm right, and why it's like so, but:
Excitation 10.024V readings (expected, read and abserr in mV)
range expected read abserr
0.0 0.000 0.181 0.181
0.5 5.012 5.311 0.299
1.0 10.024 10.316 0.292
1.5 15.036 15.314 0.278
2.0 20.048 20.320 0.272
Excitation 4.999V readings (expected, read and abserr in mV)
range expected read abserr
0.0 0.000 0.087 0.087
0.5 2.500 2.647 0.148
1.0 4.999 5.146 0.147
1.5 7.499 7.643 0.145
2.0 9.998 10.142 0.144
Locking at the results above (for all ranges expect 0.0):
- absolute error is almost 0.146(mV) when Vexc is 5V (5000mV), so 0.00292%, let's say 0.003% * VExc => 0.15mV
- absolute error is almost 0.285(mV) when Vexc is 10V (10000mV), so 0.00285%, let's say 0.003% * VExc => 0.3mV
Note that absolute error for 0.0 range is almost 1/2 (0.003% * VExc)