Section 4: Sourcing and measuring Model 2601B-PULSE System SourceMeter Instrument Reference Manual
4-70 2601B-PULSE-901-01A April 2020
Figure 68: Pulse width control
Pulse duty cycle
Duty cycle is the percentage of time during the pulse period that the output is on. It is calculated
as follows:
Duty cycle = Pulse width / (Pulse width + Off time)
For example, if the pulse width is 10 ms and the off time is 90 ms, the duty cycle is calculated
as follows:
= 10 ms / (10 ms + 90 ms)
See Maximum duty cycle equation (on page 7-2) for additional information on calculating the
maximum duty cycle for a SMU.
Pulsing in the extended operating area (EOA)
When the pulser is disabled, you can pulse in the extended operating area of the SMU.
Pulse sweeps can be performed outside of the standard operating area by setting the appropriate
compliance level. Review the specifications for the 2601B-PULSE to determine the maximum current
and voltage values available in pulse mode. When pulsing in the extended operating area (EOA), the
source-measure unit (SMU) will force the pulse to end early if the pulse width exceeds the maximum
value. It will also delay the next source action as necessary to stay within the duty cycle capabilities of
the SMU. The following figure and table illustrate the pulse regions for a SMU when pulsing in the
EOA. Refer to the 2601B-PULSE specifications on tek.com/keithley for the latest pulse width and duty
cycle information.
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