3-12 DC Current Source Operation Model 6220/6221 User’s Manual
Return to Section 3 topics
Source preset
The PRES key can be used to set the source to a preset value and range. When
the PRES key is pressed, the source will select the preset range and set the pre-
set value. The preset value is set as follows:
1. Press the PRES key. The message “PRES” is displayed while the preset
value is being used.
2. Using the source editing keys as explained in Figure 3-3 and Figure 3-4,
set the preset value to the desired level.
When finished using the preset value, press PRES again to disable the feature.
The “PRES” message will cancel, and the unit will return to the original source
value. Note that the compliance value cannot be preset, and source preset values
cannot be saved as part of a user setup.
Sourcing current
To source current, (1) connect the test circuit (DUT) to the output, (2) set the
source range output value and compliance, (3) enable the output filter (if desired),
and finally, (4) turn the output on.
1. Connect test circuit (DUT) to Model 622x output.
WARNING Before making or breaking connections, the Model 622x
must be turned off and the power cord must be discon-
nected from the AC outlet. Also, power must be removed
from all external test circuits and instrumentation.
Connection information is provided in Section 2. Keep in mind that there
are two basic output triax connector configurations that can be selected:
• Inner shield connected to Output Low. Cable Guard is not available.
• Inner shield connected to Cable Guard with Output Low connected
to the outer shield (Earth Ground) of the triax connector.
2. Set the source and compliance values.
• Figure 3-3 explains how to set the source and compliance values for
the Model 6220.
• Figure 3-4 explains how to set the source and compliance values for
the Model 6221.
While in the edit mode, AUTO range can be used, but range changes will
not occur during the editing process.
After setting the I-source value for a fixed range, enabling AUTO range will
select the optimum (lowest) range for the source value.
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