2: General operation Series 2600B System SourceMeter® Instrument
2-76 2600BS-901-01 Rev. C / August 2016
Output-off states
Carefully consider and configure the appropriate output-off state, source, and compliance limits
before connecting the Series 2600B to a device that can deliver energy (for example, other voltage
sources, batteries, capacitors, solar cells, or other Series 2600B instruments). Configure
recommended instrument settings before making connections to the device. Failure to consider the
output-off state, source, and compliance limits may result in damage to the instrument or to the
device under test (DUT).
Output-off modes
Turning a source-measure unit (SMU) off may not completely isolate the SMU from the external
circuit. The output-off mode can be used to place the Series 2600B SMU in a known, safe,
non-interactive state during idle periods, for example, when changing devices. A Series 2600B SMU
can be in one of three output-off modes: Normal, high-impedance, or zero.
Normal output-off mode
The normal output-off mode is the default output-off mode setting. When the source-measure unit
(SMU) is in the normal output-off mode, you can select either the current or the voltage output-off
function (see Output-off function (on page 2-77
)). You can also specify current and voltage output-off
limits (Output-off limits (compliance) (on page 2-78)).
When the output is turned off, the output goes to either 0 V or 0 A, depending on the selected output-
off function. Voltage is the default output-off function.
High-impedance output-off mode
For the high-impedance output-off mode (HI-Z), the output relay opens when the output is turned off.
This disconnects external circuitry from the input/output of the source-measure unit (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 mode
The Series 2600B is configured as described below when it is in the zero output-off mode.
When the V-Source is the selected source:
• The programmed V-Source value remains on the display.
• Internally, the V-Source is set to 0 V.
• The current compliance setting remains the same as the output-on value. Compliance detection
remains active.
• Measurements are performed and displayed.
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