How Do I Set Up DAQ Channel Wizard to Acquire Thermocouple Readings from an Analog Devices 5B47 Module?
Primary Software: Driver Software>>NI-DAQ
Primary Software Version: 6.5.2
Primary Software Fixed Version: N/A
Secondary Software: LabVIEW Development Systems
Hardware: Signal Conditioning Other>>5B Series>>5B47
Problem: How do I configure virtual channels in Measurement & Automation Explorer (MAX) to acquire thermocouple readings from signal conditioning modules 5B47?
Solution: You can use a 5B47 module to read temperatures from thermocouples through the Channel Wizard by following these steps:
- Click on Measurement & Automation Explorer; expand Devices & Interfaces and verify that your DAQ board is functioning properly. Help can be found by going to the DAQ Configuration Wizard on our webpage (see link below).
- Next, right-click on Data Neighborhood and choose "Insert" from the pop-up menu to create a virtual channel. In the Create New Channel window, select "Analog Input". The next window will prompt you to Enter Channel Name and Description. Fill it out and click Next.
- Next it will ask you to select a sensor type or measurement type. Select "voltage measurement". Do not select "temperature" (or the type of thermocouple), because the 5B47 module will give you a voltage between 0 V and 5 V after linearizing the thermocouple output. If you select temperature, the software will expect voltages in mV and give you incorrect temperature readings. Also, make sure you check the box next to "This will be a temperature measurement".
- Select deg C as the unit and enter the input range found on the module as your measurement range (e.g., 0 to +200 deg C).
- The next screen will prompt you for scaling method and module output. Because 5B modules automatically map input values to output values linearly, choose the Map Ranges option from the list. From the table on the side of the module, enter the output range of the module. For the 5B47, it is always going to be 0 V to 5 V.
- The next screen will ask you for information about your DAQ hardware. Choose your DAQ board from the list and choose the channel to which the module is connected. This value is either channel 0 or 1 (Analog Output 0 or 1), which corresponds to modules 14 and 15 on the 5B backplane if you are connected to an E-Series DAQ board. For PC-AO-2DC and Lab/1200 Series Devices, analog output modules must be installed in slots 8 and 9, which correspond to analog output channels 0 and 1, respectively. Select the type of input mode you will be using for that channel. Your DAQ board should always be configured in Non-Referenced Single Ended (NRSE) mode for use with 5B Series backplanes. If you are using a board that does not function in NRSE mode, configure it to Referenced Single Ended (RSE) mode and configure your 5B backplane accordingly.
NOTE: Depending on the type of DAQ board you are using, you may not be able to change the input mode from within the Channel Wizard. If this is the case, cancel the Virtual Channel configuration. Go back to Devices and Interfaces or NI-DAQ Configuration Utility, select the DAQ board used for this measurement and configure it to the proper input mode. You may have to shut down the system and reconfigure jumpers located on your board.
- Press the Finish button to complete the channel setup. You will be taken back to the main Measurement & Automation window. If you expand Data Neighborhood, you will now see the virtual channel you just configured. You can click on the channel name to verify all the information entered. Right-click on the channel and select the test button, you should see the appropriate voltage readings displayed in a graph format. If this is not the case, it might be that you either selected the wrong input or output voltage range. In this case, you can right-click on the channel name and select properties, make all the necessary changes and test again.
Related Links: Hardware Installation/Configuration Troubleshooter
5B Series Troubleshooting Wizard
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Report Date: 07/23/1999
Last Updated: 06/11/2004
Document ID: 1NM86MMG
