Difference between revisions of "Strain Gauge Amplifier"

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==== Formulas ====
 
==== Formulas ====
<syntaxhighlight lang=basic style="border:0px dashed blue">
+
<syntaxhighlight lang=vb style="border:0px dashed blue">
  
  
 
G = 1  ;Amplifier Gain
 
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[V] * Sensitivity[mV/V] * Load/(Rated Load)</nowiki>
+
Vout[mV] = G * Vex * S * L/LR
  
<nowiki>Load = Vout*(Rated Load) / (G * Vex * Sensitivity)</nowiki>
+
; Calculate the applied load from the output voltage
  
where:
+
Load = Vout * LR / (G * Vex * S)
* Vout = Output Voltage of the Amplifier
 
* G = Amplifier Gain
 
 
</syntaxhighlight>
 
</syntaxhighlight>
  

Revision as of 13:28, 6 October 2017

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.

Formulas

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)


Useful Links