limit window comparator amp op

[Sa05999]

Hi

The comparator does not working properly. When I set the input voltage below 5V which is the value of zener diod the output not equal to zero??

any help will be appreciated 

[DiegoH214]

Hello Sa05999,

Are you following any example circuit?

Have you tried one of the datasheets circuits?

Diego H

National Instruments.

[Sa05999]

Thank you, the problem was setting the threshold 5 to 5 overlapped with each other while I am thinking that I am setting it to -5 to 5.