Keithley SourceMeter 2400, User Manual

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10-16 Sweep Operation 2400 Series SourceMeter
®
User’s Manual
Setting delay
Generally, the time duration spent at each step (or point) of a sweep consists of the source
delay and the time it takes to perform the measurement (NPLC setting).
NOTE
For the Model 2430 Pulse Mode, source delay is not used. Instead, pulse width
(for the on-time) and pulse delay (for the off-time) are the delays that are set by
the user. Pulse Mode sweeps are covered later in this section.
The source delay is part of the SDM cycle and is used to allow the source to settle before
the measurement is made. (See
Section 6 , “ Source-delay-measure cycle ,” for details).
The total time period of the source delay could include an auto-delay and/or a user pro-
grammed delay. With auto-delay enabled, 1ms of delay is used. The user programmable
source delay adds 0000.0000 to 9999.9990 seconds of delay. See
Section 3 , “ Source
delay ,” to set these delays).
Additional delay for a sweep is available by using the trigger delay. This user-specified
delay (0000.0000 to 9999.99990 seconds) occurs before each SDM cycle (device action)
of the sweep. Thus, the trigger delay is executed before each new source-point in the
sweep. See
Section 11 , “ Trigger models ” and “ Configuring triggering ,” to set trigger
delay.
NOTE For linear staircase, log staircase, and custom sweeps, source delay, trigger
delay, and NPLC settings are global and affect all sweep points simultaneously.
For source memory sweep only, both the source delay and NPLC settings can be
set to different values for each point in the sweep.
Trigger count and sweep points
The trigger count and number of sweep points should be the same or multiples of one
another. For example, with five sweep points and a trigger count of 10, the sweep will run
twice. See
Section 11 for details on trigger count.
Performing sweeps
Procedures for the various sweep types are covered below.
NOTE For the Model 2430, the following procedure assumes that the DC mode of oper-
ation is selected (“Vsrc” or “Isrc” displayed in source field). If in the Pulse
Mode (“Vpls” or “Ipls” displayed), you can return to the DC Mode by pressing
CONFIG V or I, selecting the SHAPE menu item, and then selecting PULSE.
Use the EXIT key to back out of the menu.
The following procedure assumes that the SourceMeter is already connected to
the DUT as explained in
Section 2 .
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