Hioki 3153 - Page 158

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9.1 External I/O Terminal
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Rela
y
GND of the external
p
ower su
pp
l
y
3153
4
.7 kΩ
EXT.DCV
EXT.COM
External
p
ower su
pp
l
y
4
.7 kΩ
External I/O Terminal
Photocou
p
ler
NOTE
A signal can absorb up to 60 mA.
If the current capacity is not sufficient, connect a transistor or the like to the
outside in order to amplify the current.
When connecting an inductive load such as a relay, connect the diode in parallel
with the coil.
Photocou
p
ler
External I/O Terminal
3153
EXT.DCV
EXT.COM
4
.7 kΩ
+5 V
ISO.GND
ISO.DCV
4
.7 kΩ
NOTE
The output signal status upon power-on may be undetermined. Care should be taken
in the operation of equipment connected to the external I/O.
(1) Controlling the relay (When the external power supply is used)
To link the relay to an external device, make connections as shown below.
(2) Obtaining a signal limit (When the internal power supply is used)
To obtain a signal limit, make connections as shown below. In addition,
check the output current.