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

Acquiring an Analog Reading from a Thermocouple using an SCXI-1121 or SCXI-1120

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Filename: scxi-1121_thermocouple.zip
Requirements: View

This example program acquires thermocouple data from an SCXI-1120 or SCXI-1121, averages it, linearizes it, and graphs it on a strip chart.

Note: This VI assumes that you have set your SCXI-1120/1121 channel gains to 2000 and therefore setting the input limits to 0.0025 to -0.0025 volts. If you set your SCXI-1120/1121 channels to different gains with the jumpers, change the input limits on the block diagram appropriately for your DAQ device and SCXI module combination. You may get a LV Warning Code 10025 if the input limits you set do not exactly match the software configuration.

The temperature sensor on the SCXI terminal block is used for cold junction compensation.

The program averages many samples for each data point to reduce noise in the temperature signal. This technique is recommended when you are acquiring data from slowly varying input signals.

This example does not allow user control of the channel clock rate (interchannel delay). The interchannel delay is the time between any two consecutive channels within a scan. By default, LabVIEW will determine a correct interchannel delay based on the SCXI gain and filter settings.

Hint/Suggestions: To display more channels on the strip chart you must change cluster size of the array to cluster icon in the diagram.

Requirements


Filename: scxi-1121_thermocouple.zip

Software Requirements


Application Software: LabVIEW Full Development System 5.0.1
Language(s): LabVIEW

Hardware Requirements


Hardware Group: Multifunction DAQ (MIO), SCXI
Hardware Model: SCXI-1120, SCXI-1121
Driver: Traditional NI-DAQ (Legacy) 6.0

 
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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/).