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TOS3200
Judgment System
The TOS3200 judges PASS, L-FAIL, or U-FAIL with respect to a preset reference.
Table 4-2 shows the judgments for measured values according to the TIMER, LOWER, and
UPPER settings. Pass and L-FAIL are judged only if TIMER is ON.
Validity of the Lower Reference
Normally, the TC and PCC of the same EUT are within a specified range of the EUT, but if the
current is extremely small, it cannot be measured. Specifying LOWER ON and setting the
lower reference to a value slightly smaller than the range specific to the EUT help to detect a
disconnection or a bad connection of the test leads. This allows more reliable tests.
Table 4-2 Judgment patterns
• PASS If the measured values are within the reference range up to the end of the
test (TIMER 0 s), the TOS3200 will indicate PASS, and the test ends.
• L-FAIL If a current less than or equal to the lower reference is measured, the
TOS3200 will indicate L-FAIL, but the test continues until the end of the test
(TIMER 0 s).
• U-FAIL If a current greater than or equal to the upper reference is measured, the
TOS3200 will indicate U-FAIL, and the test stops immediately.
TIMER LOWER UPPER
Measured value distribution
judgment
Lower reference Upper reference
ON
ON ON
PASS
U-FAIL
L-FAIL
U-FAIL
OFF ON
PASS
U-FAIL
ON OFF
PASS
L-FAIL
OFF OFF PASS