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6-8
TOS9213S/ TOS9213AS
•
Keep the signal line at least 500 mm from the high-
v
oltage test lead
w
ire
and the DUT. Do not short-circ
u
it the test
v
oltage to the signal line. Other-
w
ise, all internal circ
u
its may
b
e destroyed.
• Do not extract a c
u
rrent exceeding the maxim
u
m rated c
u
rrent of 100 mA
from the +24
V
internal po
w
er s
u
pply. Once a c
u
rrent exceeds the maxi-
m
u
m rated c
u
rrent, the o
v
erc
u
rrent protection f
u
nction acti
v
ates and “24
V
OCP” flashes on the LCD. The tester enters the PROTECTIO
N
stat
u
s.
If the o
v
erc
u
rrent protection f
u
nction acti
v
ates, t
u
rn off the PO
W
ER s
w
itch
to pre
v
ent an o
v
erc
u
rrent.
If an o
v
erc
u
rrent flo
w
s contin
u
ally for ho
u
rs, the internal circ
u
it may mal-
f
u
nction.
• The internal control circuit of the tester is designed to prevent malfunction caused
by noise generated by the tester or peripheral devices. However, connected
devices may malfunction, if unshielded cables are connected to SIGNAL I/O ter-
minals, because cables would virtually make a sort of “antenna” to pick up exter-
nal noise. To avoid this problem, use metal connectors, shielded cables, and
external circuits housed in a shielded case. Connect them to the tester’s housing
(do not connect the COM line to a shield or an earth ground). These measures
insulate SIGNAL I/O-related circuits from the external environment, thus reduc-
ing malfunction due to noise.
6.2.3
Starting a test
To start a test by using the SIGNAL I/O connector, set the ENABLE signal to a low
level first. After a lapse of 10 ms or more from the READY signal has turned to a
low level, set the START signal to a low level for 5 ms or more. The READY signal
turns to a high level after the effective START signal has been detected.
When the ENABLE signal is the low level, the START signal for the SIGNAL I/O
connector is enabled. At the same time, the START input for the REMOTE terminal
and the START switch on the panel are disabled.
Fig.6-5
START signal
CAUTION
NOTE
READY (OUT)
ENABLE (IN)
START (IN)
5 ms or more
10 ms or more
Содержание TOS9213AS
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