11-4 Limit Testing Models 2500 and 2502 User’s Manual
With the grading mode selected, each enable software test (Limits 3 to 6) is performed
until a failure occurs. When a test fails, the FAIL message is displayed and the testing pro-
cess for that DUT is terminated.
With the sorting mode selected, each enabled software test (Limits 3 to 6) is performed
until a test passes. When a test passes, the PASS message is displayed and the testing pro-
cess for that DUT is terminated.
Binning
Even though no additional equipment is required to perform limit tests on the DUT, the
Model 2500 is typically used with a component handler to perform binning operations.
After the testing process, the DUT will be placed in an assigned bin.
For the grading mode, the binning system can be further automated by adding a scanner.
With the use of a scanner, the tests can be repeated (cycled) to test individual elements of a
single package. See “Binning systems,” page 11-10, for more information on using com-
ponent handlers and scanners to perform binning operations.
Operation overview
Grading mode
Grading mode limits operation is detailed by the flowchart in Figure 11-2. A test is only
performed if it is enabled. If disabled, operation proceeds to the next test. The following
assumes the first three limit tests are enabled and the digital output of the Model 2500 is
connected to a component handler for DUT binning. See “Binning systems,” page 11-10.
If a handler is not used, ignore digital input/output (handler interface) actions.
With the limit tests properly configured, turn the Model 2500 output on and press the
LIMIT key. The testing process will start when the component handler sends the SOT
(start-of-test) strobe pulse to the Model 2500. 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.
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