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Measuring Temperatures with VirtualBench-DMM

Primary Software: Other NI Software>>VirtualBench
Primary Software Version: 2.6
Primary Software Fixed Version: N/A
Secondary Software:

Problem: I am trying to use VirtualBench-DMM to measure temperature using a thermocouple. What settings must I configure?

Solution:
To start, you need to go to the Edit pulldown menu and click on Settings. Then, follow the instructions below:

Temperature Sensor: Specifies the temperature sensor type. Be sure that you are choosing the correct component for your application.

Temperature Units: Specifies the temperature units, such as Fahrenheit or Celsius.

TC Cold Junction Source: Specifies the type of cold junction sensor if you are measuring temperature from a thermocouple.
  • IC Sensor C should be used with SCXI-1300, SCXI-1320, SCXI-1321 or when using an IC Sensor that produces 0.01V for every 1 degree Celsius.
  • IC Sensor F should be used with IC Sensors that produce 0.01V for every 1 degree Fahrenheit.
  • Thermistor (Vref) should be used with SCXI-1303, SCXI-1322, SCXI-1327, SCXI-1328 or when using a thermistor that uses voltage excitation.
  • Thermistor (Cref) should be used with the DAQPAD-TB-52 or when using a Thermistor that uses current excitation.
  • Constant should be used when there is not a CJC sensor.


Cold Junction Channel: Specifies the cold junction channel.
  • mtemp should be used with the SCXI-1100, SCXI-1120, SCXI-1121, SCXI-1122 when the CJC is in multiplexed mode.
  • cjtemp should be used with the SCXI-1102 and DAQPAD-TB-52
  • A channel number should be used when the board/module's accessory does not have a channel name for CJC, using Direct mode with SCXI, or to have a custom CJC channel.


Cold Junction Temperature (Degrees): If using a constant CJC value instead of a built-in sensor, enter the approximate temperature at the connection of the thermocouple to the connector block.

Once you have made all these settings, test the channel. You should see a correct temperature reading. If not, verify that all of your settings are correct.

More documentation has been added in VirtualBench-DMM 2.6. If you have an interest in upgrading, follow the link below and click on the Upgrade Advisor.


Related Links: Upgrade information

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Report Date: 06/14/1999
Last Updated: 09/13/2002
Document ID: 1MDAAQTS

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