Module spare parts TRICONEX 2301

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TRICONEX 2301

When programmatically adjusting timing settings, you can set the task to acquire continuously, acquire a buffer of samples, or acquire one point at a time. For continuous acquisition, you must use a while loop around the acquisition components even if you configured the task for continuous acquisition using MAX or the DAQ Assistant. For continuous and buffered acquisitions, you can set the acquisition rate and the number of samples to read in the DAQ Assistant or programmatically in your application. By default, the clock settings are automatically set by an internal clock based on the requested sample rate. You also can select advanced features such as clock settings that specify an external clock source, internal routing of the clock source, or select the active edge of the clock signal. Configuring Channel Properties All ADEs used to configure the SCXI-1141/1142/1143 access an underlying set of NI-DAQmx properties. Table 5-1 shows some of these properties. You can use Table 5-1 to determine what kind of properties you need to set to configure the module for your application. For a complete list of NI-DAQmx properties, refer to your ADE help file. Note You cannot adjust some properties while a task is running. For these properties, you must stop the task, make the adjustment, and re-start the application. Tables 5-1 through 5-4 assume all properties are configured before the task is started. Table 5-1. NI-DAQmx Voltage Measurement Properties Property Short Name Description Analog Input»Maximum Value AI.Max Specifies the maximum value you expect to measure. The SCXI-1141/1142/1143 gain and E/M Series DAQ device range are computed automatically from this value. Analog Input»Minimum Value AI.Min Specifies the minimum value you expect to measure. The SCXI-1141/1142/1143 gain and E/M Series DAQ device range are computed automatically from this value. Chapter 5 Using the SCXI-1141/1142/1143 Module © National Instruments Corporation 5-5 SCXI-1141/1142/1143 User Manual Analog Input»General Properties»Advanced»Gain and Offset»Gain Value AI.Gain Specifies a gain factor to apply to the signal conditioning portion of the channel. The SCXI-1141/1142/1143 supports 1, 2, 5, 10, 20, 50, or 100. Analog Input»General Properties»Advanced»High Accuracy Settings»Auto Zero Mode AI.AutoZeroMode Specifies when to measure ground. NI-DAQmx subtracts the measured ground voltage from every sample. Analog Input»General Properties»Advanced»Input Configuration»Coupling AI.Coupling Specifies the input coupling of the channel. The SCXI-1141/1142/1143 supports DC and GND coupling. Analog Input»General Properties»Filter»Analog Lowpass»Cutoff Frequency AI. LowPass.CutoffFreq Specifies the lowpass cutoff frequency