46 TOS5300
About Judgment
The TOS5300 Series judges whether a test results in PASS, L-FAIL, or U-FAIL on the basis of the limits
that are set in advance.
Effectiveness of the upper and lower limits
Normally, even a good DUT will have a certain degree of leakage current. Setting the upper limits
just within the boundaries of the characteristic range of the DUT is useful in detecting breaks in the
test leads and poor connections, enabling you to perform highly reliable testing.
You can perform tests effectively by enabling the lower limit (turning LOWER on) in withstanding
voltage tests and the upper limit (turning UPPER on) in insulation resistance tests.
Invalid Settings
If you specify an invalid value for a setting, a message blinks in the level bar area. While a message
is displayed here, the READY LED turns off, and you cannot start testing. You also cannot select
other items.
Specify a valid value.
• PASS When the test time elapses (TIMER is 0 seconds), if the condition “lower limit <
measured value < upper limit” is true, a PASS judgment is made, and the test ends.
• L-FAIL
If the condition “lower limit
≥ measured value” is true, a LOWER FAIL judgment is
made, and the test is immediately stopped.
• U-FAIL If the condition “upper limit ≤ measured value” is true, an UPPER FAIL judgment is
made, and the test is immediately stopped.
Message Description
UP < LOW When the lower or upper limit is turned on, and the upper limit has been set lower
than the lower limit.
OVER VOLT When the limit voltage has been set lower than the set test voltage.
OVER WAIT When the timer is on and the judgment wait time has been set to a value that is
greater than or equal to the total of the voltage rise time and the test time.
OVER 550 VA When the test voltage and the upper limit are set in the AC withstanding voltage
test settings such that their product exceeds 550 VA.
OVER 55 W When the test voltage and the upper limit are set in the DC withstanding voltage
test settings such that their product exceeds 55 W.
OVER 1.1 mA When the test voltage is set in the insulation resistance test settings such that when
divided by the lower limit, the quotient exceeds 1.1 mA.
TIMER UPPER
LOWER
10.0
mA
20.0
mA
2.50
kV
60
.
0
s
ACW
UP<LOW
0
110mA
Lower Current
Example of what is displayed if you specify an upper
limit that is lower than the lower limit
READY LED turns off
The message blinks.
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