I have been trying to use a piezo film sensor ( https://www.sparkfun.com/products/9199 ) for detecting the vibration of my A/C unit continuously. I am very new to this kind of stuff and found online that paralleling a high-value resistance will dampen the AC spike. Can someone please tell me how that happens and how the output will be if I parallel the terminals of the film with a high resistance. My doubt is since they are paralleled, there won't be a difference in the voltage output, right?
Any other advices or topics of research on the same will be greatly appreciated. Please help me, my project is due soon

 

Loading the output with a high resistance is likely to reduce the output voltage since these transducers have a high output impedance.

"What is an AC spike"?

The presentation at the link below might be of some help to you.
PIEZOELECTRIC TRANSDUCERS MODELING AND CHARACTERIZATION