TOS7200
45
SIGNAL I/O Connector
Output signal
CAUTION
Install signal wires more than 50 cm from the high voltage test leadwire, DUT, and the like.
Avoid short-circuiting the test voltage to a signal wire. If the test voltage is short-circuited to a
signal wire, the entire internal circuit may be destroyed.
•
When a load is short-circuited, the open-collector output causes the burning of an
output element or printed circuit board. We recommend inserting a protection fuse into
the output.
•
When driving an inductive load such as a relay, be sure to connect a diode in parallel with
the coil.
•
The tester’s internal control circuit is designed to prevent malfunctions caused by noise
generated by the tester or peripheral equipment. However, connected equipments may
malfunction if bare (unshielded) cables are connected to SIGNAL I/O terminals, because
such cables would make a sort of “antenna” to pick up external noise. Therefore, for
connectors, cables, and the external circuit, use a shielded metal connector, a shielded
cable, and an external circuit provided in a shielded enclosure, respectively. Moreover,
connect each to the cabinet of the tester. This isolates the circuits related to the SIGNAL I/
O connector from the external environment and reduces noise-induced malfunctions.
Example of Driving the Relay
COM
30 V or less
400 mA or less
Relay
The relay is driven
by an output
Example of Obtaining a Low-level Digital Signal
COM
30 V or less
R
A
Low upon
signal output
Obtains a Low-level digital
signal using an output signal
Содержание TOS7200
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