- Community Home
- :
- Discussion Forums
- :
- Most Active Hardware Boards
- :
- Multifunction DAQ
- :
- How to calculate Temp from Resister from PT100 equation,

turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

Topic Options

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page

11-27-2003 03:10 AM

Options

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report to a Moderator

This is sound like the Mathematic problem. I measure the voltage (SCXI-1121) of PT100. After I got the signal I need to calculate back to Temp.

My problem is about how to recalculate from the polynomial equation of PT100 as following

Rt=R0[1+at+bt^2+c(t-100)t^3] :

Rt : from measurement

R0 : 100 ohm

I also try with Mathlab (roots() command) and iteration but the answer has a lot of root and complex root in which it is far away from the actual temp value.

I don't know that I did is the wrong solution to get the Temp value ?

Thank you in advance for anybody help.

12-01-2003 07:27 PM

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Email to a Friend
- Report to a Moderator

How Do I Calculate a Thermocouple Reading, That Uses Cold Junction Compensation, By "Hand?"

http://digital.ni.com/public.nsf/websearch/DBF08A40F88F9C8D8525643A00578E53?OpenDocument

Also, if you have LabVIEW, there is a VI that does this conversion from voltage to temperature for you. The VI is called 'Convert Thermistor Reading VI' and can be found in the Data Acquisition>>Signal Conditioning subpalette.

I hope this helps.

Regards,

Todd D.

NI Applications

Engineer