I am trying to design an instrumentation amplifier using 3 Op-Amps

 

It’s interesting that the scope shows -553V from a 6V circuit.

You show no connection to GND in your 6V power supply circuit.

 

I think you might need to connect the battery grounds together. As you have drawn it the grounds are floating with respect to each other. That is NOT the correct way to do things. Connect pin 4 of U5A to pin 4 of U6A and connect both of them to the ground on R12. Can you tell me why you have two batteries V3 & V4 when a single one would suffice?

 

hi MMM.
Where is R12 resistor connected too, it's the divider for Vref.???
E

Update,
You could use the junction in your 4 off battery pack for a 0V.
+2batt 0v 2batt-

 

The middle if the 4 cells in series must be connected to ground.

Also, TL082 is not going to work well on ±3V.

 

hi,
ref Supplies
E

 

Yes I did this because I have a battery that has positive and negative poles, how to make ground practically?

That is a typical newbie error.

A battery has its terminals labeled with + and -.
This does not mean that the terminals are +ve and -ve.
It only means that one side is 1.5V higher than the other. It is a relative voltage, not absolute voltage.

Connect the ground on the 2 + 2 cell split, (replace 9V with 3V in the drawing):

 

hi,
Is this close to what you have for the power lines.??
E

 

Wire your batteries like this:



Edit: same as what eric is showing.

 

hi,
Is this close to what you have for the power lines.??
E

View attachment 282370

The output is still wrong. I have reversed the polarity of the battery such that the input to pin 4 is -3

 

What about the connections on U5B?

 

hi,
My image shows pin #4 at -3V .??
E

 

https://www.ti.com/lit/ds/symlink/tl082.pdf

see page 11, input common mode voltage range: Vcc-+2 Vcc+0.1

Also I suspect you need a ground reference somewhere in the 200 mV input

 

What about the connections on U5B?

It is the same as U5A, as U5A, and U5B are the two channels of TL082 opamp

 

https://www.ti.com/lit/ds/symlink/tl082.pdf

see page 11, input common mode voltage range: Vcc-+2 Vcc+0.1

That is only for a new version, a TL082H.
The older version had the -input not working if it is within 4V from the negative supply voltage.

The datasheet for the TL082 recommends a minimum supply that is +5V and -5V.
Your circuit inputs have no DC voltages, they are "floating".

 

https://www.ti.com/lit/ds/symlink/tl082.pdf

see page 11, input common mode voltage range: Vcc-+2 Vcc+0.1

Also I suspect you need a ground reference somewhere in the 200 mV input

Sorry, I don't understand what this means, and how significant it is

 

That is only for a new version, a TL082H.
The older version had the -input not working if it is within 4V from the negative supply voltage.

The datasheet for the TL082 recommends a minimum supply that is +5V and -5V.
Your circuit inputs have no DC voltages, they are "floating".

Same issue

 

hi MMM,
I don't have a TL082, used a typical low power rail OPA,
The typical 3 OPA/INA circuit works as expected.
E

 

hi MMM.
Sim with 10k grounding resistors on the 100mV input.
E

 

You power supply for the opamp is +3V and -3V. The inputs to the opamp need to be in the common voltage
range which for +3 and -3 power is +3+.1 and -3+2 or +3.1 and -1 volt. (Someone else said it might be
+3.1 and -3+4 -> +3.1 to +1).

Also your inputs (+ input to U2 and U3) aren't referenced to ground, they are floating. Try adding a resistor
like 100k from each to ground (as a quick fix/check, it's not what you'd do in a real IA circuit).