Section 4: Sourcing and measuring Model 2601B-PULSE System SourceMeter Instrument Reference Manual
4-26 2601B-PULSE-901-01A April 2020
Output-off modes
Carefully consider and configure the appropriate output-off state, source function, and
compliance limits before connecting the 2601B-PULSE to a device that can deliver energy (for
example, other voltage sources, batteries, capacitors, solar cells, or other 2601B-PULSE
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).
Turning off the 2601B-PULSE output may not completely isolate the instrument from the external
circuit. You can use the output-off mode to place the 2601B-PULSE in a known, safe, noninteractive
state during idle periods. The available output-off modes are normal, high-impedance, and zero.
Normal output-off mode
The normal output-off mode is the default output-off mode setting.
When normal is selected and the pulser is disabled, the source function sources either 0 A or 0 V, as
set by the smua.source.offfunc attribute. The output can be limited using the
smua.source.offlimitY attribute. The default output-off function is DC voltage with a 40 V limit.
When normal is selected and the pulser is enabled, the output circuit is shorted.
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 mode for tests that turn the
output off and on frequently.
Zero output-off mode
When the pulser is disabled and the zero output-off mode is selected, the programmed source
remains on the display, but internally, the voltage source is selected and is set to 0 V. Measurements
are made and displayed.
When the selected source is voltage, the current compliance setting remains the same as the
output-on value and compliance detection remains active.
When the selected source is current, the current compliance setting is the programmed current
source value or 10 percent full-scale of the present current range, whichever is greater.
You can use the 2601B-PULSE as a current meter when it is in zero output-off mode because it
outputs 0 V but measures current.
When the pulser is enabled and the zero output-off mode is selected, the output circuit is shorted and
measurements cannot be made.
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