Hioki ST5520, Instruction Manual, Page: 68 / 201

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Checking Short Circuit before Applying the Set Voltage (Short circuit check function)
5.2
Checking Short Circuit before Applying the
Set Voltage (
Short circuit check function)
This is a function to check for short circuit by applying a low voltage (2 V to 4 V)
to the equipment to be measured after starting a test and before applying the set
voltage. If the equipment to be measured is short-circuited, a short circuit error (Short
M
Ω
) is displayed in the measured value display section, and the test stops. The
set voltage is not applied. This function can prevent a judgment error when short
circuit disappears when a high voltage is applied if the equipment to be measured is
short-circuited by whiskers. The short circuit check function determines whether the
equipment to be measured is short-circuited or not by applying direct current voltage
and then measuring the current value. During the period immediately after the check
is started, a difference cannot be identified between the short circuit of the insulator
and the charging current to the electrostatic capacity. In this instrument, the current
value is measured after the set time has elapsed to determine whether a short circuit
occurs or not.
Voltage (V)
Set voltage
t1: 20 ms
MIN
Response time
Test duration
Time (t)
2 to 4 V
Timing chart