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11-8 Limit Testing Models 2500 and 2502 User’s Manual

Sorting mode

Sorting mode limits operation is detailed by the ﬂowchart in Figure 11-5. 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 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 start-of-

test (SOT) 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.

For Limit 1 and 2 tests (compliance), a failure will display the FAIL message and termi-

nate 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 (Limits 3 to 6)

enabled, the testing process will terminate and the PASS message will be displayed.

Assuming Limit 1 or 2 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 :CALC7: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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Keithley 2500 User Manual

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