Figure 9-5 Six-Point Test Branching Example - Keithley 6430 Instruction Manual

9-8 Sweep Operation
Sweep branching
When using a Source Memory Sweep while performing limit tests, the normal sequence of
sweep memory points can be changed. This is useful when, based on the results of an initial
test, a different set of tests are needed.
The sweep can branch to a specified memory location point, or proceed to the next memory
location in the list. When a memory location is specified, the sweep will branch to that memory
location if the test is successful (PASS condition). If not successful (FAIL condition), the
sweep proceeds to the next memory location in the list. With NEXT selected (the default), the
sweep proceeds to the next memory location in the list regardless of the outcome of the test
(PASS or FAIL condition).
Figure 9-5 shows a six-point sweep branching example. In this case, the unit is programmed
to branch to location 7 when a pass condition occurs at location 3.
Figure 9-5
Six-point test
branching example
Caution must be used when branching since infinite memory loops can inadvertently be cre-
ated. 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 CON-
FIG LIMITS MENU. (See Section 11, Limit testing and Configure limit tests for details.) Via
remote, use the :CALCulate2:CLIMits:PASS:SMLocation command. (See Section 17, Config-
uring and running a sweep.) See Diode test example below for a typical example.
NOTE
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.
Source Memory Locations
1
2
3
4
5
6
Should be the same to
maintain triggering sequence.
Branch on fail is available via remote only with CALC2:CLIM:FAIL:SML. See
Section 17 for details.
Pass
7
8
9