Figure 12-11 Diode Pass/Fail Limits - Keithley SourceMeter 2400 User Manual

®
2400 Series SourceMeter User's Manual
Test parameters for this test include:
• Source Function: current
• Sense Function: voltage
• Source Current: 100mA
• Source Delay: 100ms
• Limit 2 Upper Value: 0.85V
• Limit 2 Lower Value: 0.75V
• Limit 3 Upper Value: 0.82V
• Limit 3 Lower Value: 0.78V
Figure 12-11 demonstrates graphically how parts are sorted. Diodes with a voltage
between 0.78V and 0.82V are considered good and will pass the limits test. Diodes that
test with a slightly wider voltage range are routed to QA for analysis, while those with the
largest voltage tolerance will be discarded.
Figure 12-11
Diode pass/fail limits
Bad Diode, Bad Diode,
Discard to QA
Low Limit 2
(0.75V)
Table 12-3 summarizes the basic SCPI command sequence for performing a limit test for
the diode breakdown described above, and
Note that the test connections shown in
NOTE
Additional programming steps will be necessary to test the values returned by
the :CALC2:LIM2:FAIL? and :CALC:LIM3:FAIL? queries. A returned value of
1 indicated a failure of that limit test.
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Good Bad Diode, Bad Diode,
Diode to QA Discard
Upper Limit 3
(0.82V)
Low Limit 3 Upper Limit 2
(0.78V) (0.85V)
Table 12-4 summarizes pass/fail parameters.
Figure 10-8 can be used for this test.
Limit Testing 12-25