Strain Gauge Amplifier

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Connection and Wiring Guidelines

Load Cell

A load cell based on strain gauge sensors is basically a full wheatstone bridge which is specified by its voltage sensibility in [mV/V] of the applied excitation voltage and the load sensibility in [Applied Load/Rated Load].

The SGA-2 Amplifier can be connected either in 4- or 6 wire mode:

Sga 6wire full bridge.JPG Sga 4wire full bridge.JPG

The 6-wire mode compensate any voltage drops on the excitation voltage line between the amplifier and the sensor/load cell.


G = 1  ;Amplifier Gain
S[mV/V] = 10 ; Sensitivity 
LR[Kg]  = 1  ; Rated Load
L[Kg]   = 0.5 ; Applied Load
Vex[V]  = 10  ; Excitation Voltage

Vout[mV] = G * Vex * S * L/LR

; Calculate the applied load from the output voltage

Load = Vout * LR / (G * Vex * S)

Single Strain Gauge

Strain Gauge sensors are available in different sizes, shapes and orientations. Depending on the application the can be mounted in combination or different orientations for having more sensibility or compensate temperature effects.

In common in application cases is the fact that at the end a full wheatstone bridge must be build up. The strain gauge itself can be either one, two or even all of the four resistors in the bridge. The completion of the bridge can be either be externally of the strain gauge amplifier or internally.

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