A&D Weighing Indicator AD-4407 Dokumentacja Pobierz pdf (Strona 8)

Page 6 AD-4407 Weighing Indicator

3.1.3. Adjustment of the Load Cell Output

Caution Use a metal film resistor in the range of 50kohm to 500kohm with a

good temperature coefficient, when adding a resistor to adjust a load

cell output. Use as large of a resistance value as possible in the range

in which the 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 0.25mV /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 required to cause a one division

change of the display. Select as large an input 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.

DBE **

£25.0

Weighing instrument

using multi-load cell

DBE

£25.0

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]

25.01

750

05.035000

³=

. Therefore,

regard the instrument as a good

design.

3. Installation and Precaution

Loadcell

Additional

resistance

Loadcell

Additional

resistance

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 65 66

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