Sourcetronic MPK-2000e, Руководство пользователя

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6. Some notes about accuracy
In order to obtain the specified accuracy, the operator has to adjust the
test current to a value higher than the 80% of the nominal value. If it were
necessary, it is possible to use a lower current, but by doing this the
accuracy will be affected.
MPK-2000e has an auto-compensation system that automatically
eliminates the error produced by internal offset. Thus, it is not necessary
to carry out measurements by reversing the polarity in order to compute
the average value. Nevertheless, if the operator suspect that there is a
difference of temperature between the contact points that would can
generate thermoelectric voltages, it is necessary to carry out two
measurements by reversing the current cables and so, the circulation
sense of the current through the resistance under measurement. The
resistance value to be measured will be the average between the values
in one sense and in the contrary (direct and inverse current).