Getting Started with Load Cells Using the SCXI-1520
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This example program allows you to use the SCXI-1520 to null one or more load cells, or other full-bridge transducers. It then performs a buffered data acquisition.
The example is easy to use because Virtual Channels, rather than SCXI Channel Strings, are used to reference the input channels. When using this example program you need not disconnect any signal connections before performing the null and calibration.
The null algorithm is compatible with both relative and absolute full-bridge transducers. In the case of the absolute transducer, both a pre-null initial offset and a post-null residual offset are calculated. This example program measures the offset and adjusts the internal potentiometers to null the offset. Optionally you can save (in the SCXI-1520 module EEPROM) the calibration data, such as the potentiometer settings, to reduce the need for re-nulling before performing future acquisitions.
After the null is completed, a buffered data acquisition follows.
If you do not use this example program, you must disconnect and reconnect the signals to perform nulling. To perform nulling without using this example program, refer to the following KnowledgeBase link:
KnowledgeBase Entry 2I7EBBJ3: How Can I Measure a Full-Bridge Transducer with the SCXI-1520?
Filename: 3797.llb
Application Software: LabVIEW Full Development System 6.1
Language(s): LabVIEW
Hardware Group: SCXI
Hardware Model: SCXI-1520
Driver: Traditional NI-DAQ (Legacy) 6.9.3
The example is easy to use because Virtual Channels, rather than SCXI Channel Strings, are used to reference the input channels. When using this example program you need not disconnect any signal connections before performing the null and calibration.
The null algorithm is compatible with both relative and absolute full-bridge transducers. In the case of the absolute transducer, both a pre-null initial offset and a post-null residual offset are calculated. This example program measures the offset and adjusts the internal potentiometers to null the offset. Optionally you can save (in the SCXI-1520 module EEPROM) the calibration data, such as the potentiometer settings, to reduce the need for re-nulling before performing future acquisitions.
After the null is completed, a buffered data acquisition follows.
If you do not use this example program, you must disconnect and reconnect the signals to perform nulling. To perform nulling without using this example program, refer to the following KnowledgeBase link:
KnowledgeBase Entry 2I7EBBJ3: How Can I Measure a Full-Bridge Transducer with the SCXI-1520?
Requirements
Filename: 3797.llb
Software Requirements
Application Software: LabVIEW Full Development System 6.1
Language(s): LabVIEW
Hardware Requirements
Hardware Group: SCXI
Hardware Model: SCXI-1520
Driver: Traditional NI-DAQ (Legacy) 6.9.3
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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/).