This is the first time I'm handling a professional load cell, and nobody else at my company has worked with them before.
I'm quite sure I've broken the load cell. I just checked the datasheet and see I should not have squeezed it. It's only rated for 300g. There is such a thing as "ultimate static overload" (250%), and I've definitely surpassed it. Furthermore, the datasheet says I should see an input impedance of ~415Ω and an output impedance of ~350Ω. I find it bizarre that they're not the same. Meanwhile, my LCR meter tells me the output is exactly 292.8Ω and the input is exactly 292.8Ω.
When I connect it to my HX711 setup, I get the same constant reading. I see in the datasheet it has a recommended excitation of 10VDC. All the load cell ADCs I can find have 2.7-5V in their datasheets. Does anyone know any ready-to-go Arduino-esque load cell ADC modules that can provide a steady >10VDC excitation voltage?
The only thing I know for sure is I'll be a lot more careful with load cells from now on, and I'll add overload protection to my test rig, but I'm confused about the 10V excitation and about the input impedance being higher than the output impedance. As I can't be sure my load cell is broken or not, I'll try to get a replacement as a sanity check. Feels bad.
Looking for advice. Thank you.