Product specifications

Page 6 AD-4329A Weighing Indicator
3.1.3. Adjustment of the Load Cell Output
Caution Use a metal film resistor in the range of 50kΩ to 500kΩ with a good
temperature coefficient, when adding a resistor to adjust a load cell
output. Use as a large resistance value as possible in the range in
which zero adjustment is possible. Solder this resistor at a point near
the load cell or the indicator.
In Case of Reducing the Output Voltage
When the zero output is too large, add a resistor
between EXC+ and SIG-.
In Case of Adding an Offset Voltage to the Output
When the zero output is too small, add a resistor
between EXC+ and SIG+.
3.1.4. Verifying Load Cell Output and Input Sensitivity
The input sensitivity of the indicator is 0.15μV/division or more. Adapt to the following
inequality, when you design a weighing instrument using the indicator and load
cell(s).
Caution A change in input voltage sensitivity is equivalent to a one division
change of the display. Select as large an input voltage sensitivity voltage
as possible so that the weighing interval becomes stable.
Consider the leverage if a lever is used.
Weighing instrument
using one load cell.
A
DBE
0.15
∗
∗
≤
Weighing instrument
using multi-load cell
NA
DBE
0.15
∗
∗
∗
≤
A: Rated capacity of load cell [kg]
B: Rated output [mV/V]
D: Weighing interval [kg]
E: Excitation voltage [mV]
N: Number of load cells
Verification Example
Design:
Load cell N=1
Rated capacity A=750 [kg]
Rated output B=3 [mV/V]
Excitation voltage E=5000 [mV]
Weighing interval D=0.05 [kg]
Weighing capacity 300 [kg]
0.151
750
0.0535000
≥=
∗
∗
. Therefore,
regard the instrument as a good
design.
3. Installation and Precaution