Sorting Mode - Keithley SourceMeter 2400 User Manual

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2400 Series SourceMeter User's Manual Limit Testing 12-9

Sorting mode

Sorting mode limits operation is detailed by the flowchart in Figure 12-5. A test is only
performed if it is enabled. If disabled, operation proceeds to the next test. The following
assumes the digital output of the SourceMeter is connected to a component handler for
DUT binning. (See "Binning systems," page 12-11.)
With the limit tests properly configured, turn the SourceMeter output on and press the
LIMIT key. The testing process will start when the component handler sends the start-of-
test (SOT) strobe pulse to the SourceMeter. Note that if a handler is not used, testing will
start when LIMIT is pressed. Pressing LIMIT a second time terminates the testing process.
As shown in the flowchart, limit tests are performed after a measurement conversion.
For Limit 1 test (compliance), a failure will display the FAIL message and terminate the
testing process for that DUT. For the pass condition, operation will proceed to the next
enabled limit test. If, however, there are no software limit tests (Limit 2, 3, 5-12) enabled,
the testing process will terminate and the PASS message will be displayed.
Assuming Limit 1 passes, each enabled software limit test will be performed until one of
them passes. When a test passes, the PASS message is displayed and any pending limit
tests for that DUT are cancelled. If all the limit tests fail, the FAIL message will be
displayed.
Binning
For the sorting mode, only immediate binning can be performed. After the testing process
is finished (FAIL or PASS displayed), the appropriate output bit pattern will be sent to the
component handler which will place the DUT in the assigned bin. (The pass/fail condition
can also be queried via remote with :CALC2:LIM<n>:FAIL?.)
Using a sweep with immediate binning lets you test different devices at different source
levels. For example, assume a 3-point linear sweep at 1V, 2V, and 3V step levels. The first
DUT is tested at 1V, the second DUT is tested at 2V, and the third DUT is tested at 3V.
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