Ammeter shunt to burden voltage relation

[brumbarchris]

Hello all,
I am looking at the attached table, extracted from the detailed specifications of the Fluke 8845A multimeter; and I cannot correlate the figures for the shunt resistance and burden voltage. Take the 10mA, 100mA and 400mA ranges,  for instance. They all share the same 1Ohm shunt. At 100mA, the voltage drop would be just 0.1V, not 0.25V.
I understand that this burden voltage would also include the voltage drop on fuse and contacts, but even then, I would expect that the burden voltage for 400mA is 4 times higher than the one for 100mA and it is not. It is just double.

Why is it so?

Regards,
Cristian

[bdunham7]

The resistance of the 440mA fuse that protects all of the lower ranges is more significant in series with the 1R shunt but almost negligible in series with the 100R.  So the 10/100/400 ranges will actually be much more than 1R, the spec implies <2.5R total (shunt+fuse+wiring).  Actual measurement that I just did gives me .021, 0.21 and 0.84V burden voltage on those three ranges at full scale.  So the spec appears to be just wrong on the 400mA range and everything else makes sense.

[brumbarchris]

Understood, thank you for the reply!

Cristian