National Instruments 1142 User Manual
Contents
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Power-Up State.............................................................................................................. 4-1
Digital Control Circuitry ............................................................................................... 4-3
Input Amplifiers ............................................................................................................ 4-3
Digital Control Circuitry ............................................................................................... 4-3
Input Amplifiers ............................................................................................................ 4-3
Filter Theory ................................................................................................... 4-5
Performance of the SCXI-1141/1142/1143 Module Filters............................ 4-6
Performance of the SCXI-1141/1142/1143 Module Filters............................ 4-6
Magnitude Response......................................................................... 4-6
Phase Response................................................................................. 4-8
Setting the Cutoff Frequency............................................................ 4-11
Phase Response................................................................................. 4-8
Setting the Cutoff Frequency............................................................ 4-11
Using the SCXI-1141/1142/1143 Module as an Antialiasing Filter............... 4-12
Using the External Clock Input....................................................................... 4-14
DC-Correction Circuitry and Overload Recovery .......................................... 4-15
Filter Bypass Mode ......................................................................................... 4-16
Using the External Clock Input....................................................................... 4-14
DC-Correction Circuitry and Overload Recovery .......................................... 4-15
Filter Bypass Mode ......................................................................................... 4-16
Multiplexed Mode (Recommended) ............................................................... 4-16
Parallel Mode .................................................................................................. 4-17
Parallel Mode .................................................................................................. 4-17
Typical Program Flowchart ............................................................................ 5-1
General Discussion of Typical Flowchart....................................................... 5-3
General Discussion of Typical Flowchart....................................................... 5-3
Creating a Task Using DAQ Assistant or Programmatically ........... 5-3
Adjusting Timing and Triggering..................................................... 5-3
Configuring Channel Properties ....................................................... 5-4
Acquiring, Analyzing, and Presenting.............................................. 5-7
Completing the Application.............................................................. 5-7
Adjusting Timing and Triggering..................................................... 5-3
Configuring Channel Properties ....................................................... 5-4
Acquiring, Analyzing, and Presenting.............................................. 5-7
Completing the Application.............................................................. 5-7