Kikusui TOS5200 - Page 25

TOS5200 25
Connecting to the Device under Test (DUT)
2
Installation and Preparation
5
Connect the low-voltage test lead (black) to the DUT.
6
Connect the high-voltage test lead (red) to the DUT.
7
Connect the high-voltage test lead (red) to the front-panel HIGH VOLT-
AGE terminal.
8
Check that the DANGER LED is turned off.
Reducing the effect of noise
Noise may be generated if the outputs are shorted or if the DUT insulation is damaged. Elec-
tronic devices in the surrounding area may malfunction due to the effect of this noise. To
reduce the effect of noise, connect a toroidal core or a resistor of approximately 470 Ω
between the tips of the high- and low-voltage test leads and the DUT. Connect the toroidal
core or resistor as close to the DUT as possible.
If you are connecting a toroidal core, it is effective to wrap the test leads two to three times
around a type of core that can be snapped on and that is often used with power cables. This
type of core is usually approximately 20 mm in diameter.
If you are connecting a resistor, pay close attention to the power rating of the resistor. When
the upper limit is 10 mA or less, connect a resistor of approximately 470 Ω (3 W, 30 kV
impulse withstanding voltage). Because this resistor causes the voltage to fall, the voltage
that is actually applied to the DUT is slightly lower than the voltage that is generated from the
product’s output terminals (when a 10 mA current flows, the voltage falls approximately 10 V).
These methods are extremely useful in reducing the effect of noise.
Low-voltage test lead (black)
High-voltage test lead (red)
OUTPUT
DANGER
T
OS5
200
Off
470 Ω, 3 W
470 Ω, 3 W
DUT
Toroidal core
Toroidal core
HIGH VOLTAGE
terminal
Connect the toroidal core or resistor as close to
the DUT as possible.
LOW terminal
TOS5200
HIGH VOLTAGE
terminal
LOW terminal
TOS5200
DUT