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| 型號： | SWPTC-01 |
| 英文描述： | SWPTC-01 Programming Software for PTC-01 Programmer |
| 中文描述： | SWPTC - 01 PTC軟件編程，01編程 |
| 文件頁數(shù)： | 15/21頁 |
| 文件大?。?/td> | 914K |
| 代理商： | SWPTC-01 |
PTC-01
Software for MLX90215
PTC-01 Programmer User’s Manual Rev 1.2 15/NOV/2001 Page 15
Executing the Auto-Calibration Routine
After the setup has been completed and the device parameters set the user can now run the auto-calibration.
The auto-calibration can be started by selecting “calibrate” from the actions menu or by clicking the
“calibrate” action button. The software will then prompt the user with further instructions.
Overview
The auto-calibration routine first takes a series of measurements at both min and max set-points. The pa-
rameters are specially selected to work with nearly every conceivable application. Using these measure-
ments the calibration routine uses a look-up table to make an estimate for the gain and offset parameters.
Next the software make several measurements and uses a linearization technique to fine-tune the gain or
sensitivity. Finally the software take several more measurements and uses some mathematical formulas to
set the applications critical point. The routine takes one final set of measurements to check the accuracy of
the calibration. Through the entire calibration the user will be prompted to adjust the sensor five times. If the
intermediate option is selected six adjustments are necessary.
Results
The results of automatically calibrating the rotational-position sensor are shown below. In the first column of
the results window some of the setup parameters or target specifications are displayed. The second col-
umn shows the measured results from the auto-calibration. The third column displays the error between the
target specifications and the measured results.
Important Note:
The auto-calibration routine calibrates the sensor for an ideal supply voltage of 5.0 Volts. This is done by
using ratiometric values during its calculations. This means the measured output values are compensated
for variations in the supply voltage. The measurements displayed in the results window are absolute values
and may have some error caused by variation in the supply voltage. The user can use the manual mode to
determine the absolute error of the calibration.
The View in Manual Mode Function
Located in lower right corner of the auto-calibration screen is a button labeled “View in Manual.” When the
user clicks on this button the software will switch from the auto-calibration interface to the manual interface
screen. During the switch all of the device parameters from the auto-calibration interface are copied to the
RAM device parameters in the manual interface. The users can automatically calibrate the sensor, click the
“View in Manual” button, and make any additional adjustments or measurements. Note, device parameters
can not be copied from the manual interface to the auto-calibration interface.
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