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5-8 Source-Measure Concepts Model 2520 User’s Manual
Sweep waveforms
There are three basic sweep types available: linear staircase, logarithmic staircase, and
custom.
NOTE
Staircase sweeps can be programmed both from the front panel and via remote,
while custom sweeps are available only via remote.
Staircase sweeps
As shown in Figure 5-8 , the linear staircase sweep goes from the start level to the stop
level in equal linear steps. The logarithmic staircase sweep is similar except it is done on a
log scale with a specified number of steps per decade.
For the DC mode, the current will remain at a fixed amplitude for the duration of each
sweep point. For the pulse mode, the current will remain at the sweep step amplitude for
the programmed pulse width, and the time between steps depends on the programmed
delay.
NOTE The duration of each step is the sum of the programmed pulse width and pulse
delay times for both DC and pulse sweeps.
See Section 7 for more details on staircase sweep operation. See also the SOUR1:CURR
and SOUR1:SWE commands under “SOURce subsystem,” page 14-32 , for information
on programming staircase sweeps via remote.
Custom sweep
The custom sweep lets you construct your own sweep by specifying the number of source-
measure points (100 maximum) and the current source level, pulse width, and pulse delay
at each point (
Figure 5-9 ).
The SOUR1:LIST commands program various custom sweep parameters, including:
•
SOUR1:LIST:CURR
— Sets up a custom sweep list with up to 100 current
values.
•
SOUR1:LIST:WIDT
— Specifies up to 100 pulse width values for a custom
sweep.
•
SOUR1:LIST:DEL
— Specifies up to 100 pulse delay values for a custom sweep.
NOTE
If the delay or width list is shorter than the current list, the last delay or width
value will be used for the remainder of the current list points.
See the custom sweep information in Section 7 and the LIST commands under “SOURce
subsystem,” page 14-32 , for details.