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Document Type: Example Program
NI Supported: Yes
Publish Date: Sep 6, 2006

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Manually Scaling Thermocouple Measurements in DAQmx

3 ratings | 2.67 out of 5
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Filename: softwarecjc.llb
Requirements: View

This example program acquires thermocouple data from an SCXI-1102 (or any SCXI, SCC, or DAQ device that has a built-in CJC), averages it, linearizes it, and graphs it on a strip chart. The thermocouple values are read as raw voltages and scaled in software, so this example can be used as a template for any application that requires a custom thermocouple which isn't supported by DAQmx.

During the acquisition process, this VI reads the CJC (Cold-Junction Compensation) voltage along with the other channels so that the temperature readings will stay accurate over time as the ambient temperature changes. This is the same method that is used with a DAQmx thermocouple task, and will ensure that the CJC sensor is read repeatedly throughout the acquisition, as opposed to once at the beginning. Repeatedly reading the CJC sensor will eliminate the effects of temperature drift.

This example also demonstrates how to read the cold junction sensor of the SCXI module amplifier along with the rest of the channels.

Requirements


Filename: softwarecjc.llb

Software Requirements


Application Software: LabVIEW Base Development System 7.1
Language(s): LabVIEW

Hardware Requirements


Hardware Group: SCXI
Hardware Model: SCXI-1102, SCXI-1102C, SCXI-1102B
Driver: NI-DAQmx 7.0

 
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This example program (this "program") was developed by a National Instruments ("NI") Applications Engineer. Although technical support of this program may be made available by National Instruments, this program may not be completely tested and verified, and NI does not guarantee its quality in any way or that NI will continue to support this program with each new revision of related products and drivers. THIS EXAMPLE PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND AND SUBJECT TO CERTAIN RESTRICTIONS AS MORE SPECIFICALLY SET FORTH IN NI.COM'S TERMS OF USE (http://ni.com/legal/termsofuse/unitedstates/us/).