Kikusui TOS6200A, Руководство пользователя

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TOS6200A/6210 Basic Operation 4-39
4.10.4 Output Voltage Limitation (VOLT LIMIT)
This protective function limits the output voltage. If the output terminal voltage
exceeds 5.6 V when the measured value is not judged FAIL during a test, the output
voltage limitation function is tripped and the "VOLT LIMIT" indication is blinked
on the LCD.
Since no test can be performed for settings for which the product of the test current
and upper reference value (including offset value) exceeds 5.4 V, the output terminal
voltage will generally not exceed 5.6 V and the output voltage limitation function is
rarely tripped. However, for measurements using four terminals that use high-resis-
tance lead wires, or for two-terminal measurements with the offset canceling func-
tion activated, the output terminal voltage may exceed 5.6 V in some cases, tripping
this function. This causes the tester to enter protection status.
For example, assume that the DUT with 0.190

is tested with the test current set to
25 A and upper reference value set to 0.200

. If the leads connected to the DUT
are long and four-terminal measurements are made using leads exceeding 0.034

both coming and going, the combined resistance from the perspective of the output
terminals becomes 0.224

or greater, tripping the output voltage limit function for
5.6 V and disabling the test.
If the product of the test current and a combined resistance from the perspective of
the output terminals is closer to 5.6 V, use leads with lower resistance values.
Press the STOP switch to cancel output voltage limitation.
CURRENT LOWER UPPER TIMER
25.0
A
0.200 60.0
s
MAIN MAIN
FREQ LOWER OFF OFFSET OFF TIMER ON
50Hz
UPPER
VOLT LIMIT