Positive compression strain results

Hello everyone,

Currently, I am measuring compression strain on a specimen by using Dewesoft Krypton 6xSTG. The diagram below describes the applied force direction and terminal configuration.

However, the obtained results are all positive. I also swith the terminal between In+(2) and In-(7), but when it comes to thermal expansion, the strain outcome is negative in stead of positive result.

I am looking forward to hear your advices about my task.

Thank you.

This is duplicate to this topic: https://forum.dewesoft.com/software-discussions/dewesoft-software/positive-compression-strain-measurement