2400 Series SourceMeter
®
User’s Manual Sweep Operation 10-11
Caution must be used when branching since infinite memory loops can inadvertently be
created. Also, a single Source Memory Sweep will always sweep the number of points
specified, regardless of how many branches were taken.
Memory sweep branching option is set from the PASS (SRC MEM LOC) item of the
CONFIG LIMITS MENU. (See Section 12, “Limit Testing” and “Configuring limit tests,”
for details.) Via remote, use the :CALCulate2:CLIMits:PASS:SMLocation command.
(See “Configuring and running a sweep” in this section.) See “Diode test example” on
page 10-12 for a typical example.
NOTE Branch on fail is available via remote only with CALC2:CLIM:FAIL:SML. See
Section 18 for details.
Testing polarized devices — Branching can simplify the testing of polarized devices such
as diodes. Because a diode is polarity sensitive, you normally have to be careful when
installing it in the component handler. Installing the diode one way forward biases it, and
installing it the other way reverse biases it. Memory sweep branching can eliminate this
installation problem.
If, for example, your test requires that the diode be forward biased, you can configure the
compliance limit test (LIMIT 1) to fail if out of compliance. This fail condition would
indicate that the diode is forward biased, and the memory sweep will proceed to the next
source memory location to perform the source-measure operation. If, however, the diode is
installed backwards, the compliance limit test will PASS (in compliance). The pass condi-
tion will cause the sweep to branch to a memory location where the polarity of the source
is reversed, again forward biasing the diode for the source-measure operation.
This branching technique simplifies installation of the diode in the component handler
because polarity is no longer a concern. If the diode is installed backwards, the sweep will
branch to a memory location that reverses source polarity.
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