National Instruments 373873C-01 用户手册
Chapter 6
Performing Sweep Measurements
© National Instruments Corporation
6-5
3.
Click the Run Once button again to execute the sweep.
The frequency response of the Filter step plots on the new graph while
the project runs. The graph displays the transfer function of the filter,
or the amplitude output expressed in decibels versus the frequency.
the project runs. The graph displays the transfer function of the filter,
or the amplitude output expressed in decibels versus the frequency.
4.
Double-click the Filter step to display the filter specifications in the
Step Setup dialog box.
Step Setup dialog box.
The frequency response of the filter in the Filter Magnitude
Response graph matches the graph in the Data View.
Response graph matches the graph in the Data View.
5.
Select File»Save Project As and save the project as
My Sweep.seproj
in the
SignalExpress\Examples\Tutorial
directory.
You can use the Sweep step to sweep multiple parameters simultaneously
by adding additional parameters on the Sweep Configuration tab of the
Sweep Step Setup dialog box. Sweeping two or more parameters
simultaneously is called a parallel sweep. For example, if you want to vary
the amplitude of a stimulus signal, you can run a parallel sweep. You can
use a parallel sweep to maximize the precision of the acquisition by varying
the input range of a digitizer or MIO device as you vary the signal level. As
the signal level increases, you can increase the input range of the
measurement device to ensure you use the entire resolution for the
measurement.
by adding additional parameters on the Sweep Configuration tab of the
Sweep Step Setup dialog box. Sweeping two or more parameters
simultaneously is called a parallel sweep. For example, if you want to vary
the amplitude of a stimulus signal, you can run a parallel sweep. You can
use a parallel sweep to maximize the precision of the acquisition by varying
the input range of a digitizer or MIO device as you vary the signal level. As
the signal level increases, you can increase the input range of the
measurement device to ensure you use the entire resolution for the
measurement.
Running Multidimensional Sweeps
Use multidimensional, or nested, sweeps to iterate through one range while
you vary another range. For example, if you want to sweep through
frequencies of a stimulus signal at different amplitudes, run a nested sweep.
You can set the amplitude to level 1 and sweep through frequencies, and
then set the amplitude to level 2 and sweep through frequencies, and so on.
You can build a nested sweep by right-clicking a Sweep step in a project
and selecting Add Dimension from the shortcut menu to add another
sweep loop.
you vary another range. For example, if you want to sweep through
frequencies of a stimulus signal at different amplitudes, run a nested sweep.
You can set the amplitude to level 1 and sweep through frequencies, and
then set the amplitude to level 2 and sweep through frequencies, and so on.
You can build a nested sweep by right-clicking a Sweep step in a project
and selecting Add Dimension from the shortcut menu to add another
sweep loop.
Complete the following steps to run a sample nested sweep project.
1.
Select File»Open Project, navigate to the
SignalExpress\
Examples\Tutorial
directory, and double-click
Nested
Sweep.seproj
.
2.
Click the Run button, shown at left, to run the project.
Each iteration of the inner sweep loop sweeps the frequency of the
stimulus signal. The outer sweep loop varies the low and high cutoff
stimulus signal. The outer sweep loop varies the low and high cutoff