A problem with ADXL202

[saeid4020]

Hi
I am doing a project by ADXL202 and I want to measure "tilt angle" of X & Y axis with PWM output of ADXL202.
but when I rotate my board at direction of X , tilt angle of Y axis change about 5 degrees (in range of 90 degrees of X axis)!
what is problem?
thanks for your attention.

 

[manu]

Any output might influence any other output in order of 20%.

I.e. If you're measuring 1.0G on X axis, the Y axis ( that "really" measures 0G ) might out 0G to 0.2G

A friend have many and many times measured that, and I remember I already have seen this 'spec' writted on a datasheet.

 

[saeid4020]

thanks for your reply
but I have confronted another problem:
resolution of my Y axis in range of -70 to -90 degrees decrease too much.
what is problem?
is it natural or unnatural?

 

[manu]

Hi !

Do you remember that output is = sin ( tilt angle ) ?!

 

[saeid4020]

HI
Ok
it is TRUE but Does that mean I can't improve resolution in this range?

 

[manu]

Can you give me an example ?!