Section 3: Functions and features
2606B System SourceMeter® Instrument Reference Manual
3-26
2606B-901-01 Rev. B / May 2018
Pulse mode sweeps
A pulse mode sweep can be created for any of the sweep types by configuring the end pulse action.
To configure a pulse mode sweep for source-measure unit (SMU) A, send:
smua.trigger.endpulse.action = smua.SOURCE_IDLE
To configure a DC sweep for SMU A, send:
smua.trigger.endpulse.action = smua.SOURCE_HOLD
Timers must be used to configure the pulse width and period. Refer to
(on page 3-42) for details.
The pulse width is managed by controlling the duration between the source stimulus event and the
end pulse stimulus event. Note that a latency exists between these stimulus events and their resulting
source level transitions. This trigger latency can vary based on factors such as the source range and
the electrical characteristics of the device under test (DUT).
The figure below shows the source and end pulse stimulus events in relationship to the pulse (see
(on page 3-30)
for information for information on stimulus events). Any change in Δt will
result in a corresponding change in the pulse width.
Figure 48: 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:
Duty cycle
= 10 ms / (10
ms + 90
ms)
= 10
ms / 100
ms
= 0.10
= 10 percent
See
(on page 4-2) for additional information on calculating the
maximum duty cycle for a SMU.