JWI-586 DIGITAL WEIGHING INDICATOR
16
RELATION BETWEEN LOAD CELL OUTPUT AND
INPUT SENSITIVITY
The input sensitivity is 0.6
μ
V/D or more. The input sensitivity indicates the
variation in the load cell output voltage required to change the display one
point on the display. When designing a weighing system, the load cell output
voltage must satisfy the input sensitivity of the JWI-586. For this purpose, the
system should be designed so that the following equations are satisfied. In
order to achieve a system with stable performance, it should be designed so
that sensitivity is as great as possible.
A
：
Load cell rated load
B
：
Load cell rated output [ mV / V ]
D
：
Minimum division
（
5000 is the excitation voltage in millivolts
）（
5V
）
（
0.6 is the input sensitivity in
µ
V
）
A
D
B
×
×
≤
5000
6
.
0
Example
：
To make a weighing system with a maximum capacity of 300kg and
minimum division of 0.05kg, using a single load cell with ratings of
500kg and 3mV/V. In this example, A
＝
500, B
＝
3 and D
＝
0.05, so
that the right-hand side of equation a is as follows
：
5
.
1
500
05
.
0
3
5000
=
×
×
and equation a is satisfied.
There is thus no problem with the design.
If multiple load cells are used, the design should ensure that the following
equation is satisfied.
N
：
Number of load cells
N
A
D
B
×
×
×
≤
5000
6
.
0
When a lever is used, the lever ratio should be taken into consideration.
n
＝
The lever ratio
n
N
A
D
B
×
×
×
×
≤
5000
6
.
0
