3. Setup
22
ADI16-4(USB)
Measuring voltage
Set the range setting switch and software setting to voltage input.
Figure 3.8. Setting the voltage input
The figure below shows an example of using flat cable to connect a reference voltage generator. As a
two-wire connection is used when measuring a device such as a battery that only has positive and
negative terminals, connect the negative terminal to CH0 (-) and AG. Also connect unused channel
inputs to analog ground.
Moreover, you should connect the module by using a 2-core shielded cable in situations where the
signal source is at a considerable distance from the module or the noise immunity must be increased.
- When an analog ground is not connected, the conversion data can be unpredictable.
- In situations where the connecting cable is subject to noise, accurate analog input can fail to occur.
To avoid this problem, the connecting cable should be installed away from any sources of noise.
- An excessively long connecting cable can fail to ensure accurate analog input. The connecting
cable should be as short as possible.
- The analog signals that are input into the [+] input or [-] input should not exceed the maximum
input voltage relative to the module analog ground. A voltage greater than the input voltage can
damage the equipment.
- If either the [+] or [-] input pin is not connected, the resulting conversion data can be unpredictable.
If a channel is not connected to a signal source, both its [+] input and [-] input pins must be
connected to the analog ground.
C
H
0
[
-
]
C
H0
[
+]
A
G
C
H1[
+]
CH
1
[
-
]
G
r
o
u
nd
(G
ua
r
d)
S
i
g
n
al
(
P
l
u
s
)
R
e
f
er
e
nc
e
v
ol
ta
g
e
ge
n
e
r
a
t
o
r
D
r
y
ba
t
te
ry
AG
S
ig
na
l
(
Mi
n
us
)
S
ig
na
l
(
P
lu
s)
S
i
g
n
a
l
(
M
i
n
us
)
Gr
o
un
d
(
Gu
ar
d
)
CH
0[-]
CH0[+]
AG
C
H1[+
]
CH
1[-
]
AG
Ground
(Guard
)
Signa
l (
Plus
)
Ref
eren
ce
vol
tag
e ge
ner
ator
Signal
(Min
us)
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