Strain gauge z-probe max voltage

Gabriel

Hello everybody,

I successfully use a strain gauge with an amplifier at the entrance of the Z-probe. The amplifier has an output voltage of -10 V to +10 V for -20 N to +20 N. Which maximum voltage is supported in the long term with the input of the Z-probe? Is the Z-Probe value equivalent to the voltage?

So far, no problems have occurred.

Thank you in advance,
Gabriel

3ddevil

@Gabriel You can safely assume 3.3V and that it's probably a little daring to go up to 5V, but anything over 3.3V should read at max.

Use a voltage divider, or clamp top voltage using a diode. 10V isn't safe directly to the ATSAM as an input unless it's going through a buffer chip.

Gabriel

Thanks 3ddevil for your fast reply. I'll try one of your solutions. As long as the voltage is in the range between trigger value 0 and 1000 it shouldn't be dangerous, right?

Thanks a lot in advance.