Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 7: Theory of operation
2601B-PULSE-901-01A April 2020 7-29
Figure 125: Pulse rise and fall times
When the pulser is enabled, pulse rise and fall times are largely independent of range, load (within
the specified limits of ±10 V and < 3 µH), or protection limit settings.
Refer to the 2601B-PULSE SMU specifications for details on source settling times. For the latest
specifications, go to tek.com/keithley.
Range and pulse settling
Each SMU range has different specifications for source settling times. This causes different rise and
fall time characteristics depending on the set range.
In addition, pulse performance is dependent on the pulse setting as a percent of full scale. For
example, a 100 mA pulse on the 1 A range (which is 10%) will perform differently than a 1 A pulse on
the 1 A range (which is full scale). Refer to the 2601B-PULSE specifications for details. For the latest
specifications, go to tek.com/keithley.
SMU load and operating mode
Settling times for the current source will vary with the resistive load applied. In addition to the load, the
times will vary dependent on whether the source-measure unit (SMU) is configured as a voltage
source or a current source, and also with the voltage source range selected.
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