TOS9213S/ TOS9213AS
5-37
2.
Confirm that the analog
v
oltmeter indicates “0.”
3.
Confirm that the DA
N
GER lamp is off.
4.
Short-circ
u
it the lo
w
-
v
oltage and high-
v
oltage test lead
w
ires, and con-
firm that no high
v
oltage is applied.
5.
Connect the lo
w
-
v
oltage test lead
w
ire to the DUT.
6.
Connect the high-
v
oltage test lead
w
ire to the DUT.
•
D
u
ring the test (the TEST lamp or DA
N
GER lamp is lit), ne
v
er to
u
ch the
HIGH
V
OLTAGE terminal, test lead
w
ire, 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 k
V
). 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.
Fig.5-12
Red
u
cing the effects of noise
WARNING
470 , 3 W
470 , 3 W
Location as close as possible to the DUT
DUT
Toroidal core
Toroidal core
HIGH VOLTAGE terminal
Location as close as possible to the DUT
LOW terminal
TOS9213S
TOS9213AS
HIGH VOLTAGE terminal
LOW terminal
TOS9213S
TOS9213AS
DUT
