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2.
3.
4.
5.
6.
WARNING
• During the test (the TEST lamp or DANGER lamp is lit), never touch the
HIGH VOLTAGE terminal, test leadwire, or DUT.
■ Reducing the effects of noise
If a short circuit or breakdown occur, noise generated can lead to the malfunctioning
of peripheral electronic components. To reduce the effects of noise, install a toroidal
core or a resistor of approximately 470 Ω between the DUT and the end of the high-
voltage test leadwire from the tester, and between the DUT and the end of the low-
voltage test leadwire, as close as possible to the DUT. See Fig. 5-12.
Using a toroidal core, it is recommended that a divisible core be used for power
cable with a diameter of approximately 20 mm, and that it be wound two or three
times around the core.
When connecting a resistor, check its power rating. For an upper reference of 10 mA
or less, use a resistor of approximately 470 Ω (3 W, impulse withstanding voltage of
30 kV). When such a resistor is connected, the voltage actually applied to the DUT
is slightly smaller than the output-terminal voltage (approximately 10 V less at 10
mA) due to a voltage drop caused by the resistor. This type of resistor is highly use-
ful in reducing the effects of noise.
HIGH VOLTAGE terminal
HIGH VOLTAGE terminal
TOS9213S/ TOS9213AS
Confirm that the analog voltmeter indicates "0."
Confirm that the DANGER lamp is off.
Short-circuit the low-voltage and high-voltage test leadwires, and con-
firm that no high voltage is applied.
Connect the low-voltage test leadwire to the DUT.
Connect the high-voltage test leadwire to the DUT.
LOW terminal
TOS9213S
TOS9213AS
LOW terminal
TOS9213S
TOS9213AS
Fig.5-12 Reducing the effects of noise
Toroidal core
DUT
Toroidal core
Location as close as possible to the DUT
470 , 3 W
DUT
470 , 3 W
Location as close as possible to the DUT
5-37
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