Is it posible to reduce analog input range in order to get better sensitivity?

I'm trying to connect ordinary theromcouple without any converter to my IND I/O. I've set ADC resolution to 18bits and I still get jumps 3mV whitch is quite big step when maximum is around 40mV. Is it possible to get such resolution? If I count right ADC on 18bits have enought resolution and maybe the problem is just in my settings.

Thanks for your anwer

Ondřej

Ondřej Vinkler
Ondřej Vinkler
12
| 0 0 0
Asked on 2/19/16, 11:42 AM
1
vote
778 Views

Dear Ondřej,

The analog inputs are not connected directly to the ADC, they buffered through opamps that scale the normal -2.048V / +2.048V input range of the ADC to 0-10V or 0-20mA.

To connect thermocouples or PT100 temperature sensors to the Industruino IND.I/O I recommend to use 4-20mA transmitters. Here are a couple of examples:

http://www.omega.com/pptst/DRSL-TC_SERIES.html
http://www.omega.com/pptst/TX93A_TX94A.html

It will result in less signal loss and better immunity from interference, and enable you to have much longer cable lengths between your measurement location and the Industruino. 

Best Regards,

Loic

Loic De Buck
Loic De Buck
1237
| 3 1 3
Answered on 2/21/16, 1:56 PM
0
vote

Your answer

Please try to give a substantial answer. If you wanted to comment on the question or answer, just use the commenting tool. Please remember that you can always revise your answers - no need to answer the same question twice. Also, please don't forget to vote - it really helps to select the best questions and answers!

Ask a Question

Keep Informed

About This Forum

This community is for professionals and enthusiasts of our products and services.

Read Guidelines

Question tools

20 follower(s)

Stats

Asked: 2/19/16, 11:42 AM
Seen: 778 times
Last updated: 2/21/16, 2:00 PM