How Do I Use the Built-In CJC Sensor on My DAQ Device?

Updated Aug 21, 2019

Reported In

Hardware

  • Temperature Input Device
  • C Series Temperature Input Device

Software

  • Measurement & Automation Explorer (MAX)
  • LabVIEW

Driver

  • NI-DAQmx

Issue Details

The specifications of my NI DAQ device show it has a built in CJC (cold junction compensation) sensor. How do I use this sensor with my temperature readings? 

Solution

The Cold Junction Compensation (CJC) is active by default and is used in the calculation for your temperature readings by default. However, you also have the option to change the CJC Source property. This property can be accessed either by creating a DAQmx task in NI Measurement & Automation Explorer or using the DAQ Assistant in LabVIEW. The image below shows an example of what you will see when changing this property.



Note: The CJC Source property has the following three options. Choose the one below that works best for your application: 
1. Built In - This is the default option and uses the built in CJC in your device to give you temperature readings. 
2. Constant - Allows you to use a constant value from which your temperature readings will be calculated. 
3. Channel - Allows you to use a external CJC routed to a channel on your device. 
 

Additional Information

To read data directly from the built- in CJC, see the following:
Read Data from the Built-In CJC Sensor on DAQ Device in LabVIEW