Chapter 5 Using the SCXI-1125
SCXI-1125 User Manual 5-8 ni.com
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-1125 access an underlying set of
NI-DAQmx properties. Table 5-3 shows some of these properties. You can
use Table 5-3 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. Figure 5-1 assumes
all properties are configured before the task is started.
Note This is not a complete list of NI-DAQmx properties and does not include every
property you may need to configure your application. It is a representative sample of
important properties to configure for measurements. For a complete list of NI-DAQmx
properties and more information about NI-DAQmx properties, refer to your ADE help file.
Table 5-3. NI-DAQmx Properties
Property Short Name Description
Analog Input»General Properties»
Advanced»Range»High
AI.Max Specifies the upper limit of the
input range.
Analog Input»General Properties»
Advanced»Range»Low
AI.Min Specifies the lower limit of the
input range.
Analog Input»General Properties»
Filter»Analog Lowpass»Cutoff
Frequency
AI.Lowpass.CutoffFreq Specifies in hertz the
frequency corresponding to the
–3 dB cutoff of the filter. You
can specify 4.0 or 10000.