I have developed a piezoelectric pressure sensor using nano-fabrication which reads 10-25 mV in multimeter. I want to capture time vs Voltage waveform when pressure is applied by touching the sensor. I tried measuring by connecting both the ends of sensor to the probe of oscilloscope but I am not able to get any pulse when pressure is applied. What may be the reason and how to measure time vs voltage graph for my pressure sensor. I would be much pleased if I get the answer I am searching for. Thanks in advance.