Hioki 2300 Smart Site, Instruction Manual, Page: 83 / 366

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4 2304-20 PULSE MODULE
4.4.3 Insulation of Internal Circuit
In the 2304-20, the input circuit and alarm output are insulated
from the CAN bus as shown in the block diagram below. (With-
stand voltage: 1.4 kVAC, 50/60 Hz, Response current: 5 mA, 1
minute)
The CH1 and CH2 terminals are not insulated from each other.
When measuring two measurement points having a potential differ-
ence, equalize the ground level potential of these two points, or use
another 2304-20 Module, since measurements may be adversely
affected.
Analog
circuit
CH1
/ CH2
Me
asu
rem
en
t
In
put
Digital
circuit
Insu
latin
g
cir
cuit
Module-to-
module
communica-
tions circuit
CA
N bu
s
Co
nne
cto
r
Mo
dul
e ba
se
Po
w
e
r
Insulation
withstand voltage
of 1.4 kVAC
Insulation
withstand voltage
of 1.4 kVAC
AL
A
R
M
A
larm
ou
tpu
t
Ground
The COM terminal of the alarm output terminal is used for both
CH1 and CH2.