dear all,
i m new at test engineering and vibration engineering.i ll have a question to you, if u pls help me that will make me so happy.
my question is;
lets think we have a 10g measurement range acceloremeter. we want to make a test with it.after we did the test we read all peaks around 15g-19g. how can it be possible? is something wrong? my accelerometer has a range of 10g? how is it possible?
am i doing something wrong?
this is a important question for me.

thanks for it

Bulent KURT

A 10g range accelerometer has a sensitivity of 500 mV/g. It's rated for a maximum level of +/- 10 g PEAK. As I explained in a recent post

(see http://maintenanceforums.com/eve/forums/a/tpc/f/3751089011/m/3601091661 )

the level can't get much larger than this before clipping and overload occur.

Keep in mind that the accelerometer is rated to 10 g PEAK. This is 20 g peak-peak or 7 g RMS. If the levels you are measuring are in peak-peak terms, you're within the range of the accelerometer. If the levels you are measuring are in RMS terms, the accelerometer is overloaded and the resulting data can't be trusted.

When reporting vibration levels, remember it is vital to know if the level is in terms of peak, peak-peak or RMS! This makes a huge difference:

RMS__________peak__________peak-peak
_1___________1.4_____________2.8

Jon
http://www.spintelligentlabs.com