Hello everyone

I need a little help in how to connect a thermocouple to A\D converter
can someone explain me how to do it, i have written the code in VHDL and using a FPGA component and my output is 7 Segment.
thank you for any help.

 

National Semiconductor's Linear Applications Hand book 2, Linear Brief 24 shows how with a LM 321 & LM308 yields an output of about 10mV/deg.C.This is old,1977.

 

where can i find this handbook, can i download it from the web?

 

Thank you very much, i found that handbook.
but my question is how to connect it physically, if you have a sketch of the connection between the thermocouple to A\D converter that will be very helpful

 

If thermocouple has leads, connect one leal to -input on amp.,other lead to +; output of amp. -to ADC -, + toADC +; if reading is reversed, reverse thermocouple leads.

 

It is also important to get the thermocouple leads as close as physically possible to the amp inputs. If designing a circuit board, make sure the terminals for the thermocouple leads are not at the edge of the board, but right up next to the chip. The board traces are not made of thermocouple wire and will introduce an error in measurement if they not kept short.

 

Close doesn't matter. Dissimilar metals in contact generate Seebeck voltages. Just make as few joints as possible.