LEAD COMPENSATION IN A PWM SENSOR INTERFACE |
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| A. Custodio, R. Pallàs-Areny, R. Bragós |
- Abstract:
- Error analysis of a resistive sensor-to-microcontroller interface based on pulse width modulation (PWM) and time ratio measurement (sensor resistance over reference resistor), shows that leads resistance produce zero, gain, and nonlinearity errors. Because at the calibration points these errors are nulled out, several calibration resistors selected according to the sensor resistance range would reduce those errors in the full range. Two-point calibration and time ratio measurement yield errors smaller than 1 W for lead resistance of 10.5 W and sensor resistance from about 600 W to 3550 W, which is the typical variation range for a PT1000 temperature sensor.
- Keywords:
- sensor interface, lead resistance compensation
- Download:
- IMEKO-WC-2000-TC4-P119.pdf
- DOI:
- -
- Event details
- Event name:
- XVI IMEKO World Congress
- Title:
Measurement - Supports Science - Improves Technology - Protects Environment ... and Provides Employment - Now and in the Future
- Place:
- Vienna, AUSTRIA
- Time:
- 25 September 2000 - 28 September 2000