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About ADXL356 output voltage

Hi,

I am using the ADXL356 accelerometer sensor, in a datasheet, it is mentioned that in ±10g range sensor has typical sensitivity of 80 mV/g.

I place the sensor such that  Z-axis points towards the sky and according to me I should get 80mV because 1g acceleration is applied on-sensor due to gravity but

I am getting the following readings on each axis 

X-axis reading = 904mV

Y-axis reading = 906mV

Z-axis reading = 985mV

Can anybody tell me why this is happening

Best regards,

Pawan Kumar