SCXI 1520 Starin Gauge Module

[Orooj]

Hi....

    I am using SCXI 1520 module for measuring strrain (Through Full Bridge strain Guage), I set the Input (Min ,Max)voltage to +\- 1 Volt then the value of starin comming out is 4.6mV but when I change Input Min ,Max to +\- 500mV the output of starin guage become 2.3mV please clarify my doubt.

[9444024536]

When you reduce excitation,out put also reduces