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6 Advanced Source, Measurement, and Control
To return grouped outputs back to an ungrouped state, turn the output off and remove the parallel
connections between the outputs. Then uncheck the check boxes. Then cycle AC power to the unit for
the grouping or ungrouping changes to take effect. Grouped settings are saved in non-volatile
memory.
From the remote interface:
Send the following command to group channels 2 through 4. To address this group, use channel 2.
SYST:GRO:DEF (@2,3,4)
To ungroup all channels:
SYST:GRO:DEL:ALL
To reboot the instrument for the grouping changes to take effect either cycle AC power, or sent the
following command:
SYST:REB
N678xA 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.
The following figure shows the voltage priority operating locus of the power modules. The area in the
white quadrants shows the output as a source (sourcing power). The area in the shaded quadrants
shows the output as a load (sinking power.
Keysight N6705C User's Guide
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