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參數(shù)資料
| 型號： | DEM-ADS1201U |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | USING THE ADS1201 EVALUATION BOARD(ADS1201評估板的使用) |
| 中文描述： | 使用本ADS1201評估板（ADS1201評估板的使用） |
| 文件頁數(shù)： | 6/15頁 |
| 文件大?。?/td> | 741K |
| 代理商： | DEM-ADS1201U |
6
resulting offset and gain calibrations are then displayed in
the adjacent text boxes. After performing the offset and gain
calibrations, the user will select Normal mode. From this
point on, every new data that is captured is calibrated using
these offset and gain calibration values.
The information regarding the previously selected modula-
tor clock frequency, decimation ratio, output data rate and
FFT window function is displayed in the lower right hand
corner of the main window.
CONFIGURATION WINDOW
Usually, the first thing that the user does after running the
program is to access the filter configuration window. In this
window (see Figure 12), the user can select from one of eight
different modulator clock frequencies (MCLK) and type in
a decimation ratio. Decimation ratio can also be entered by
scrolling the horizontal scroll bar. The output data rate is
automatically calculated and displayed in a text box. When
the OK button is pressed, the configuration registers inside
the FPGA are programmed for the selected MCLK and
decimation ratio. After configuring the digital filter, the user
can activate the main window and perform offset and gain
calibration or capture new data. The information regarding
the previously selected modulator clock frequency, decima-
tion ratio and output data rate is displayed continuously in
the main window at the lower right hand corner.
DEBUG WINDOW
In the Debug window, the user can read and write to the
filter configuration registers, read from the output data
register, and set/change the parallel port base address (see
Figure 13).
DC VOLTMETER WINDOW
In this window, the output of the filter is continuously scaled
and displayed as voltage on a DVM-like display. In addition,
a measurement history of up to 1000 points are kept (see
Figure 14). The measurement interval and the number of
averages for each measurement can be changed by the user.
This will allow the user to collect from several minutes up
to several hours of measurement history. In this window, an
EKG-type display is provided to keep a graphical history of
the measurement data. The graph moves from right to left as
new data comes in. The horizontal scrollbar allows the user
to review the previously collected data while new measure-
ments are being made. This window also has a pull-down
menu that allows the user to copy the measurement data to
a file, display data on the screen, or quit the window.
DATA COLLECTION AND DISPLAY
Normally, after the filter configuration is done, the user
should perform offset and gain calibration before collecting
new data. Offset calibration must be done first. To do this,
in the main window, click on the Offset_Cal radio button
and press the Capture button. After this is done, the value of
the offset calibration is displayed in a text box in front of the
Offset_Cal radio button. Next, to perform gain calibration,
click on the Gain_Cal radio button and press the capture
button. After calibration is finished, the value of the gain
calibration coefficient is calculated and displayed in a text
box in front of the Gain_Cal radio button. From this point
on, the user can collect new data by clicking on the
Normal_Mode radio button, selecting the number of data
points to be collected and pressing the Capture button. The
collected data is automatically adjusted to account for the
offset and gain calibration coefficients. The graph is set to
auto scale by default, which displays an optimum fit of data
on the graph. The user can optionally change the maximum
and minimum vertical scale values manually. The user can
also zoom in on a portion of the graph by holding down the
left mouse button and dragging on the rectangular area to be
zoomed. After zooming is performed, a horizontal scroll bar
appears that allows the user to pan left and right on the
graph. To unzoom, click the right mouse button and select
Undo Zoom from the popup menu. There are many more
features associated with the graph. The user can explore
these features by moving the mouse cursor onto the graph
area and clicking the right mouse button. A popup menu
appears from which different selections can be made.
After collecting new data, the user can click on the FFT
radio button to display the FFT of the data just collected. For
the FFT to work, the number of data collected must be a
power of two. An example of time and frequency plot is
shown in Figures 9 and 10, respectively.
A list of collected data can be displayed by clicking the
Display Data List button or by selecting the Display Data
option from the File menu. Either way, the data is displayed
in a list box. The user can scroll up and down through the
data. The form containing the list box can be resized to
display more of the data on the screen at one time. The
average and standard deviation of collected data is calcu-
lated and displayed on top of this form.
Collected data can be copied to a file for future analysis and
display using other mathematical and graphical applica-
tions. To copy data to a file, select the Copy option from the
File menu and enter the desired file name and path. Data is
saved as ASCII format.
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相關代理商/技術參數(shù) |
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