The AUTO resistance measuring mode of the Model
2400 configures the unit to source current, measure voltage and
calculate resistance. The magnitude of the source current is selected
automatically by the resistance range, much like a typical Digital
Multimeter.
The MANUAL resistance measuring mode of the Model 2400 allows the
user to select a source of voltage or a source of current. If current
is sourced then voltage is measured. If voltage is sourced then
current is measured. The value of the source is also user defined.
This mode allows very tight control over the resistance measurement.