I want to test wheatstone bridge circuit wtih an instrumental amplifier MCP6N11.First of all, i tested all of the system totally but it didn't work so ı tested wheatstone bridge

and it worked.But I want to test MCP6N11.I give a signal from the pin 2 and pin 3 , 1khz and 1Vpp. I connected 2 resistance 2k and 1k as a gain resistance between pin 5 and pin6 .ı connected pin 1 between these pins.ı connected power supply to pin 7 and pin 4. Finally ı connected pin8 to the ground so it connected to the pin4.I give 5 V power to the amplifier.But i didn't take any result from the ossiloscope.Should ı add a resistor or something?

 

Connect your bridge to the amplifier inputs.
Apply 1kHz, 1Vpp to the bridge supply.

 

hi ay,
Check pin #5 Vref on the datasheet.
E

EDIT:
You have pin #8 connected to 0V, so the Amp is in the CAL mode.??

 

hi,
This PDF is a guide for using a Wheatstone bridge with that amp.
https://www.google.co.uk/url?sa=t&r...c/52031A.pdf&usg=AOvVaw2fwwtt-l06451qoL6iJ1Co
E

 

thanks for your answer,
ı forgot to write that ı connected pin8 to the ground but ı changed it and ı connected it to the power supply 5V.But still not working
For pin5,
this is the block diagram so ı connected it like here.

 

Connect your bridge to the amplifier inputs.
Apply 1kHz, 1Vpp to the bridge supply.

First of all ı want to test ınstrumental amplifier.I want to see it works.

 

Connect your bridge to the amplifier inputs.
Apply 1kHz, 1Vpp to the bridge supply.

With a basic signal how can it work

 

hi
Check Vref connection.

E

 

If you apply a 1kHz signal at the bridge, you get a difference signal at the arms of the bridge. This gets amplified by the MCP6N11 instrumentation amplifier and output appears on pin-6.

Make sure pin-8 EN/CAL is connected to VDD, pin-7.

 

If you apply a 1kHz signal at the bridge, you get a difference signal at the arms of the bridge. This gets amplified by the MCP6N11 instrumentation amplifier and output appears on pin-6.

Make sure pin-8 EN/CAL is connected to VDD, pin-7.

Can ı test it singly with 1khz 1Vpp input pins?
Pin8 is connected to the pin7 ,picture is wrong ı am sorry.

 

hi
Check Vref connection.

E

ı connect Vref to 1kohm and 2k ohm to the Vout and between them ı connect pin1
I measured the output pin6 and pin5
But i didn't see any signal

 

Hi,
If I am following the d/s correctly, Vref should be at Vdd/2..?
E

Sorry about the Font my PC is playing up.!

 

Ok thank you for your help, i will try this
ı want to ask one more question, Here a resistance is written RL 10k ohm, should ı add this resistance ı didn't understand

 

hi ay,
No do not add that 10K, its referring to the 0.9K output impedance of the amp.
It is important that the Vref is sourced from a low impedance drive ie: OPA output or a simple 2.5V zener would be OK for testing your project.
Lets know it goes.
E

 

hi ay,
No do not add that 10K, its referring to the 0.9K output impedance of the amp.
It is important that the Vref is sourced from a low impedance drive ie: OPA output or a simple 2.5V zener would be OK for testing your project.
Lets know it goes.
E

Still it is not working.I connected Pin8 to the Vdd
and I connected Vref Vdd/2.
But it didn't work :/

 

hi a,
I will look over your images, see what I can find.
E

EDIT:
The images look OK, except pin #5 cannot be seen clearly connected to the 10k?
What voltage do you measure from pins #3 and #4 relative to 0V.?

 

hi a,
I will look over your images, see what I can find.
E

I have a 100 V/V gain amplifier.But I set up my circuit 2V/V gain.In the data sheet it is written that Gmin is 100V/V for gain 100 amplifier.Is it problem about that?Should ı use 100 gain for this circuit?

 

hi a,
I will look over your images, see what I can find.
E

EDIT:
The images look OK, except pin #5 cannot be seen clearly connected to the 10k?
What voltage do you measure from pins #3 and #4 relative to 0V.?

1k is connected to the Pin5 and 2k is connected to the 2k ohm

 

1k is connected to the Pin5 and 2k is connected to the 2k ohm

Sorry, 2k is connected to the pin6

 

hi,
A marked up circuit diagram, showing the component values and the way pins 3 & 4 are connected, would be helpful.
These two images show the d/s circuits.
E