4: Theory of operation Series 2600B System SourceMeter® Instrument
4-28 2600BS-901-01 Rev. B / May 2013
Figure 109: Pulse rise and fall times
Range and pulse settling
Each 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 Series 2600B specifications for details. For latest
specifications, go to the Keithley Instruments website
(http://www.keithley.com).
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.
Pulse width
he pulse width is the interval between 10% on the rising (leading) edge to 90% on the falling (trailing)
edge. Exceeding the specified pulse width limits can result in short pulses. In addition, the pulse
width's jitter can change the pulse width (this is especially important for short pulse widths).
With respect to pulse width, jitter is the short-term instability of the trailing edge relative to the leading
edge.
The usable pulse width is largely affected by the source settling time and measurement speed, as
well as by the measure count. Refer to the Series 2600B specifications for details on maximum and
minimum pulse width limits, pulse width programming resolution, accuracy, and jitter. For latest
specifications, go to the Keithley Instruments website
(http://www.keithley.com).
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