National Instruments Module SCXI-1503 - Manual (Page 47)

Chapter 5 Using the SCXI-1503
SCXI-1503 User Manual 5-4 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-1503 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 5-3 assume all properties are configured before the task is started.
Table 5-1. NI-DAQmx Voltage Measurement Properties
Property Short Name Description
DAQ
Assistant
Accessible
Analog Input»Maximum
Value AI.Max Specifies the maximum value
you expect to measure. The
SCXI-1503 gain and E/M
Series DAQ device range are
computed automatically from
this value. Yes
Analog Input»Minimum
Value AI.Min Specifies the minimum value
you expect to measure. The
SCXI-1503 gain and E/M
Series DAQ device range are
computed automatically from
this value. Yes