vi logger and sc-2345

[miacrakishoin]

I am using vi logger 2.0 to record temperatures. I have a sc-2345 and a SCC-TC02. When I configure logger to use a constant the temp is of by 8-10 degrees. When I try and specify the internal channel for compensation I get an error. Anyone had any luck using logger and this configuation.

[MickeyD]

Hi,

I have not seen this behavior before, but can look into it.  A couple of things that would be helpful to know are the DAQ card, that you are connecting the 2345 to.  Also what is the error number you get, and any description it gives you.  Let me know those things and I will see if I can find information on it or reproduce it failing that.

I would also recommend looking at changing from VI logger to LabVIEW SignalExpress.  LV SignalExpress is released with the DAQmx 8.5 driver, which works find with the hardware setup you are describing, and gives you a much cleaner and easier to use interface to log your signals.  There is also a utility for converting VI logger data to be used in LV SignalExpress if you are worried about converting logged data.  You can get access this driver at ni.com. just go to the support page. 

Let me know that information and if you need any help getting signal express setup.  It is a really awesome solution for taking thermocouple readings, and is far easier to use than VI logger.  It also has a lot more capabilities, that I think you will find very useful. 

Have a great afternoon,

Michael D
Applications Engineering
National Instruments

[miacrakishoin]

6062e card

[miacrakishoin]

Message Edited by miacrakishoin on 03-21-2007 03:24 PM

[MickeyD]

Hi,

Looking at the screen shots it seems you are trying to define another channel as the CJC source.  The module you have has its own CJC, so you do not have to do that.  You sould be able to use the Built In choice for your CJC source.  This will use the internal CJC of your module.  You can find the information on how to setup your different SCC modules in the SCC quick start guide available at this link.

SCC Quick Start Guide

Please let me know if I can be of any further help with this setup issue.

Have a great day,

Michael D
Applications Engineering
National Instruments

[miacrakishoin]

When I use the built in selection I get a incorrect Temperature. I have verified the temp using two other know sources. I have labview but was trying to use tish for applications that did not need Labview for it.

Thanks

[MickeyD]

Hi,

What is incorrect about the temperature when you use built in?  Is it off by the same amount as if you use a constant?  It is possible something is wrong with your module.  Do you have another thermocouple module we could test in the same slot?

The signal you would want to route would be ai8 if you are reading in on ai0.  You can find the input line you are reading in on based on the slot you have chosen. You can find that in the SCC quick start guide, or in MAX doing the configuration.  The CJC line will be channel x+8, where channel x is the ai0 line in the example case above.  Get back to me with how that behaves as well as the questions and we will get this resolved.

Have a great day,

Michael D
Applications Engineering
National Instruments

[miacrakishoin]

The temperature readings are of exponential. If they were a constant offset then I could convert that in the output file. I have 4 modules and i am having the same issue.

[MickeyD]

I have the same hardware setup you are describing though only one module and am not seeing the offset.  Do you have any other module types.  It is possible that the chassis itself could be causing the problem.  I simply set it to built in excitation mode and got correct readings from my channel.  I assume you do not have another a chassis you could try out.  The only other thing I would ask is that if you set the excitation channel to the x+8 channel, did you see the same behavior as with built in selected?

Michael D