2600AS-901-01 Rev. B / September 2008
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2-23
Series 2600A System SourceMeter® Instruments Reference Manual
Section 2: DUT Test Connections
Output-off states
When a SMU is turned off, it may not be completely isolated from the external circuit that it is
connected to. There are three output-off states for a Series 2600A SMU: Normal, High Impedance
or zero. For the Models 2602A, 2612A, and 2636A, each SMU channel can have its own unique
output-off state.
Normal output-off state
For the normal output-off state (which is the default setting), the SMU will source 0V. The current
compliance determined by the
smuX.source.offlimiti
command (default 1mA) is used.
Therefore, the SMU may source or sink a very small amount of power. In most cases, this source
or sink power level is not significant.
High-impedance output-off state
For the high-impedance output-off state, the output relay opens when the output is turned off. This
disconnects external circuitry from the input/output of the SMU. To prevent excessive wear on the
output relay, do not use this output off state for tests that turn the output off and on frequently.
Zero output-off state
When in this output-off state, the Series 2600A is configured as follows:
When the V-Source is the selected source:
•
The programmed V-Source value remains on the display.
•
Internally, the V-Source is set to 0V.
•
The current compliance setting remains the same as the output-on value. Real compliance
detection remains active.
•
Measurements are performed and displayed.
When the I-Source is the selected source:
•
The programmed I-Source value remains on the display.
•
Internally, the V-Source is selected and set to 0V.
•
Current compliance is set to the programmed Source I value or to 10% full-scale of the
present current range, whichever is greater.
•
Measurements are performed and displayed.
While in the zero output-off state, the Series 2600A can be used as an I-Meter since it will output
0V, but measure current.
Selecting the output-off state
Output-off state menu
To access the OUTPUT configuration menu:
1.
Press the
CONFIG
key.
2.
Select the appropriate
OUTPUT ON/OFF
key.
3.
In the configuration menu, select
OFF STATE
to display the OUTPUT OFF STATE menu.