Specifications
TOS9220/9221 Connections 3-9
■
Reducing the eff
ects of noise
If a short circuit or breakdo
wn occur
, noise generated can lead to the malfunctioning
of peripheral electronic components.
T
o reduce the ef
fects of noise, install a toroidal
core or a resistor of approximately 470
Ω
between the DUT and the end of the high-
v
oltage test leadwire from the scanner
, and between the DUT and the end of the
lo
w-v
oltage test leadwire, as close as possible to the DUT
. See
Fig. 3-6
.
Using a toroidal core, it is recommended that a di
visible core be used for po
wer
cable with a diameter of approximately 20 mm, and that it be w
ound tw
o or three
times around the core.
When connecting a resistor
, check its po
wer rating. F
or an upper current of 10 mA
or less, use a resistor of approximately 470
Ω
(3
W
, impulse withstanding v
oltage of
30 kV).
When such a resistor is connected, the v
oltage actually applied to the DUT
is slightly smaller than the output-terminal v
oltage (approximately 10
V less at 10
mA) due to a v
oltage drop caused by the resistor
.
This type of resistor is highly use
-
ful in reducing the ef
fects of noise.
Fig.3-6
Reducing the Eff
ects of Noise Gener
ated b
y the Scanner
470 Ω, 3 W
470 Ω, 3 W
TOS9220
DUT
Toroidal core
Toroidal core
Output terminals
TOS9220
DUT
Output terminals
Location as close as
possible to the DUT
Location as close as
possible to the DUT