Table of Contents
Advertisement
6 Advanced Source and Measurement Functions
Agilent N678xA SMU Multi-Quadrant Operation
158
Grouped outputs are controlled using the output number of the
lowest output in the group. As shown in the following figure, output
1 is grouped with output 2 and output 3 is grouped with output 4.
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
Agilent Models N678xA SMU can be operated in either voltage or
current priority mode. They can source as well as sink output power.
Note that Agilent Models N6781A and N6782A 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).
Model N6705 User's Guide
Advertisement
Table of Contents
