used for measurement and test equipment. its used where great accuracy and stability of circuit are required.
You use a thermocouple as the input to the amplifier circuit.
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Vo=(R2/R1)(V2-V1)
High Common Mode Rejection Ratio is the main feature of instrumentation amplifier! And other features are high input impedance, low output impedance, high slew rate, low power consumption, more accurate, easier gain adjustment, low thermal and time drift.
You need a divider that is 10 to 1. You could use 10 megohms in the feedback and 1 megohm in the bottom leg. Since you are probably talking about an operational amplifier, you need this in both legs.
A instrumentation amplifier is a special purpose linear amplifier used to amplify low level signals. These are used in many industrial and medical applications.
The differential voltage is amplified using the instrumentation amplifier.This is the inference we know from instrumentation amplifier...
You use a thermocouple as the input to the amplifier circuit.
Here is qn excellent article that explains step by step: http://MasteringElectronicsDesign.com/how-to-derive-the-instrumentation-amplifier-transfer-function/
1.differential amplifier 2.operational amplifier 3.instrumentation amplifier 4.chopper amplifier 5.isolation amplier
for better amplification ...by instrumentation amplification we get the output admittance will be more
Vo=(R2/R1)(V2-V1)
An instrumentation amplifier is made out of 2 or 3 operational amplifiers.
a high common mode rejection ratio, high impedance
An op amp is made from transistors, resistors and capacitors. It is enclosed in a "chip". A basic instrumentation amp is made of 2 op-amps. you can't have a single op-amp perform as good as a instrumentation amp, although it can perfrom the same task. An i-amp has much better CMMR (common-mode rejection) and a higher input impedance.
it is mainly used for increasing the gain of the circuit
The instrumentation amplifier provides isolation, and gain to the output of the Wheatstone Bridge. It is placed before filtering because the low output of the gauges would suffer from induced noise in the filter circuit if left unamplified.