Manual Strain-Null Calibration with File Output

This VI demonstrates how to programmatically control the coarse and fine nulling potentiometers of each channel of the SCXI-1520 module. Changes to the settings of the potentiometers, the excitation, and the input limits take effect immediately as you operate the controls. The setting are then saved to a text file of your choosing. The file is a tab-delimted text file in which each row represents one channel. The first column is the channel number, the second column is the coarse setting, and the last column is the fine setting. There is a one-line header with the titles of each column. You can read from the file, File.vi, using the example program called SCXI-1520 Read Potentiometer.

Each channel of the SCXI-1520 module has its own nulling circuitry. You must use the SCXI channel string rather than a virtual channel because LabVIEW has no way to save the potentiometer values to the virtual channel in the NI-DAQ configuration file. Since this example performs the calibration for all the channels on a module, you only need to enter the SCXI channel string up to the module number. For example, ob0 ! sc1 ! md1 is all that is required to access module 1 on chassis 1. The program fills in the rest of the string for each channel. You must perform a new nulling operation each time the Input Limits or DC Voltage Excitation values change.

Requirements

Filename: 4612.vi

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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