Keysight Technologies N6700C Serie Guide D'utilisation page 167

4 Operating the Power System
AutoRanging
The following figure illustrates the autoranging output characteristic of the Keysight N675xA and
N676xA power modules. Point 3 shows a situation in which the voltage and current settings are such
that the operating locus is limited by the maximum output power boundary of the output. Depending
on the power module, this may be greater than the output power rating of the module. In this
situation, the output is not guaranteed to meet its operating specifications because it is operating in an
area that is outside its specified power rating.
Downprogrammming
As shown by the dashed line on the left in the figures, the power system is capable of sinking current
over the output voltage range from zero volts to the rated voltage. This negative current sinking
capability provides fast downprogramming of the output. The negative current is not programmable.
Multi-Quadrant Operation
Keysight Models N678xA SMU can be operated in either voltage or current priority
mode. They can source as well as sink output power. Note that Keysight Models N6781A, N6782A,
N6785A, and N6786A operate only in the + Voltage quadrants.
Voltage Priority Mode
In voltage priority mode, the output voltage should be programmed to the desired positive or negative
value. A positive current limit value should also be set. The current limit should always be set higher
than the actual output current requirement of the external load. With tracking enabled, the negative
current limit tracks the positive current limit setting. With tracking disabled, you can set different
values for the positive and negative current limits.
166 Keysight N6700C Series User's Guide