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How Can I Use the CJC on the SCC-68 to Read the Ambient Room Temperature

Primary Software: Utility Software>>Measurement & Automation Explorer
Primary Software Version: N/A
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: SCC>>Carriers

Problem:
I would like to use the CJC sensor to read the ambient temperature of the room.  How can I access and scale this signal?

Solution:
The CJC can be accessed from pin 70 and 71 in the SCC-68.  You will need to wire those pins to one of the differential inputs to read the voltages off of the CJC.  The closest channel is AI7 which are pins 57 and 23, so you will need to physically wire pin 70 to 57 and pin 71 to 23.  Once you have that connected, you will have to setup the scale for the sensor.


To scale the CJC value to a temperature value, you will need to apply this equation:


To apply this equation:

1. Save either "CJC Celsius Scale.txt" or "CJC Fahrenheit Scale.txt" to your computer
   
2. Open the Measurement and Automation Explorer
3. Right click on Scales
4. Click on Create New...
5. Select NI-DAQmx Scale
6. Click Next
7. Select Table
8. Type in "CJC Scale" for the name, or whatever name you choose to give it
9. Click Finish
10. Click on Import
11. Select the scale table that you saved
12. Select Comma for the Delimiter
13. Click Ok
14. Select deg C or deg F for the Pre-Scaled Units
15. Click on Save

You should end up with something like this:


You can now apply this scale when you create a task.

Related Links:
SCC-68 User Guide and Specifications

Attachments:

CJC Celsius Scale.txt
CJC Fahrenheit Scale.txt
CJC Celsius Scale.xls
CJC Fahrenheit Scale.xls




Report Date: 08/01/2007
Last Updated: 08/02/2007
Document ID: 4C0ABG9S

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