IMPEDANCE MEASURING SYSTEM BASED ON A DSPIC |
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| José Santos, Pedro M. Ramos |
- Abstract:
- This paper describes a device based on a dsPIC (Digital Signal Peripheral Interface Controller) as a processing unit, capable of making impedance measurements at multiple frequencies. A DDS (Direct Digital Synthesizer) stimulates the measurement circuit composed by the reference impedance and the unknown impedance. The voltages across the impedances are amplified by programmable gain instrumentation amplifiers and then digitized by analog to digital converters. To measure the impedance, a seven-parameter sine-fitting algorithm is used to estimate the sine signals parameters. The dsPIC is connected through RS-232 or USB to a computer where the user can view the measurement results. The device also contains an LCD.
- Keywords:
- impedance measurement, dsPIC, ADC, sine-fitting
- Download:
- IMEKO-TC4-2010-052.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- Instrumentation for the Information and Communication Technology Era
- Title:
- XVIIth IMEKO TC4 Symposium & 15th International Workshop on ADC Modelling and Testing (together with 3rd IMEKO TC19 Symposium)
- Place:
- Kosice, SLOVAKIA
- Time:
- 08 September 2010 - 10 September 2010