Keysight Technologies 3458A Guide D'utilisation page 442

D Optimizing Throughout and Reading Rate
Figure D-2
Another feature of the 3458A is OffsetCompensated Ohms. Very much like auto
zero in concept, offset-compensated Ohms makes a measurement of the input
resistance without the current applied to measure any thermally generated DCV
offsets. As shown in
subtracted from the measurement of the unknown resistance and the result is
presented to the display. Like auto zero, it takes two measurements to make a
final determination of the unknown resistance. In reality, offsets like this are only
encountered in lower values of resistance. The 3458A offers a 10 mA current
source that will, at least, mask the effect of the thermally generated offset. Hence,
in many cases Offset-Compensated Ohms may not be needed for lower resistance
measurements.
442
Settling time characteristic for resistance measurements
assuming <200 pF shunt capacitance in the circuit tested. For
small values of resistance, there is no real advantage to setting
the delay to less than the default values. Resistance above
100 kW require longer settling times to reach final values: hence
settling delay times for these values may save measurement
time at the expense of measurement accuracy.
Figure D-3, the current is applied, the offset voltage is
Keysight 3458A User's Guide