National Instruments Module SCXI-1125 - Manual (Page 35)

Chapter 4 Theory of Operation
SCXI-1125 User Manual 4-2 ni.com
Refer to the Configurable Settings in MAX section of Chapter 3,
Configuring and Testing , for more information about programmatically
setting gain using range settings in MAX. For more information about
programmatically setting gain using range settings in NI-DAQmx and
Traditional NI-DAQ (Legacy), refer to the
Developing Your Application in
NI-DAQmx section or the Developing Your Application in Traditional
NI-DAQ (Legacy) section, respectively, of Chapter 5, Using the
SCXI-1125 .
Filter Bandwidth and Cutoff Frequency
The SCXI-1125 provides two filtering stages with an overall response of a
four-pole Butterworth filter. You can control the cutoff frequency of the
filter through software. You can choose 4 Hz or 10 kHz. For additional
flexibility in cutoff frequency settings and for greater suppression, NI
recommends combining the hardware filtering provided by the SCXI-1125
with digital filtering. NI recommends using the Advanced Analysis
functions of LabVIEW, LabWindows/CVI, or Measurement Studio. By
combining hardware anti-aliasing with digital filtering, you can choose any
cutoff frequency.
The Advanced Analysis functions are only available in LabVIEW Full or
Professional Development Systems, and LabWindows/CVI Base or Full
Development Systems.
Refer to the Configurable Settings in MAX section of Chapter 3,
Configuring and Testing , for more information about programmatically
setting the cutoff frequency of the filter in MAX. For more information
about programmatically setting the cutoff frequency of the filter in
NI-DAQmx and Traditional NI-DAQ (Legacy), refer to the
Developing
Your Application in NI-DAQmx section or the Developing Your
Application in Traditional NI-DAQ (Legacy) section, respectively, of
Chapter 5, Using the SCXI-1125 .
Operating in Multiplexed Mode
You can configure the SCXI-1125 to operate in multiplexed mode as
described in Chapter 1,
About the SCXI-1125 . Using this mode of
operation, you can scan all input channels of the SCXI-1125 into one
output channel that is read by the National Instruments DAQ device. You
can also multiplex the CJC channel that connects to a sensor on the SCXI
terminal block for making temperature measurements.