Instrumentation Amplifier - Control & Instrumentation - Multisim

 

Instrumentation amplifier

An instrumentation (or instrumentational) amplifier (sometimes shorthanded as In-Amp or In Amp) is a type of Differential amplifier that has been outfitted with input buffer amplifier, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment. Additional characteristics include very low Dc offset, low drift, low noise, very high open-loop gain , very high common-mode rejection ratio, and very high input impedance. Instrumentation amplifiers are used where great accuracy and stability of the circuit both short and long-term are required.

Pin Diagram:

Circuit Diagram:

Simulation Circuit

In this circuit the components used are 

1. IC741
2. Resistor  5   k ohm - 2
3.                 10 k ohm  - 4
4. Variable Resistor Or potentiometer (Rg)- 5 k ohm ( Here you can also use a resistor and change the value when need )

Method 1 :  Rg is constant  5k ohm

                      V1 and V2 are variable 

Method 2 :       V1 and V2 is fixed constant

                             Rg is varied

Here the main aim of this experiment is to find the gain 

Theoretical  Formula

                         

Av = Vout / (V2 - V1)

Practical Formula 

                   

     Av = (1 + 2R1/Rg) (R3 / R2)

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