I am currently a student working on a project involving the characterization of piezoelectric materials. My goal is to simultaneously acquire both voltage and current data from piezoelectric films. To achieve this, I am using a machine that applies mechanical deformation to my piezoelectric films at a frequency of 5 Hz. When this stress is applied, the films generate a certain voltage, which I acquire using a DAC acquisition device, along with a current, which I measure using a KEITHLEY 6485 picoammeter. I aim to visualize this data using LabVIEW.
However, I am facing two major challenges in executing this project.
1. **Electronic Circuit for Current and Voltage Measurement:** I am seeking to design an electronic circuit that allows me to measure current in a closed circuit and voltage in an open circuit, while adhering to the specifications of the KEITHLEY 6485 picoammeter. I am wondering about the best practices to follow in designing this circuit while respecting measurement standards and device limitations.
2. **Incorrect Current Measurements:** When I attempted to measure the current using the picoammeter, connecting it to LabVIEW via GPIB and the RG50 probe, I obtained excessively high current values. These measurements do not align at all with the data specified in the datasheet of the piezoelectric material (PVDF) I am studying. This is concerning to me as I do not understand why these values are so far from expectations.
I want to emphasize that I am relatively new to electronics, and these issues seem complex to resolve. Time is of the essence as I have less than a month to complete this project. I am therefore seeking your expertise to help overcome these obstacles. Any guidance, technical explanations, or practical advice you can provide would be greatly appreciated.
I sincerely thank you for your attention to my situation and for any assistance you can offer. Your contribution will be crucial to the success of my project.