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Accelerometer Damping Factor ?

Hi

Could you tell me if there is a typical damping factor Analog accelerometers are designed for and particularly what it is for the ADXL325 and ADSXL326 please?

The resonant frequency is given as 5.5kHz in the data sheets and in my application it is configured with a filter bandwidth of 250Hz and I'm particularly interested in performance at the low frequency end <10Hz.

I've looked for this information through the various documents, references and forums but couldn't find it, other that one article recommending assuming it is critically damped, so I apologise if I've missed this somewhere.

Thanks

Nick

Message was edited by: Nick Kidd Hi Venkat Many thanks for your quick response :-) (Sorry, my PC won't let me reply to you, as would be normal, so the only way to respond is to edit my message !!) Cheers Nick

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  • Hi Nick100,

    The mechanical sensor in these products (ADXL325/326) has an under-damped response with a Q of ~4.5.  However, the signal conditioning ASIC has a -3dB corner frequency of 1600Hz and is a single pole filter.  So for frequencies below 250Hz the accelerometer response is flat and you don't have to worry about any variation in magnitude at the low frequencies.

    Regards,

    Venkat

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  • Hi Nick100,

    The mechanical sensor in these products (ADXL325/326) has an under-damped response with a Q of ~4.5.  However, the signal conditioning ASIC has a -3dB corner frequency of 1600Hz and is a single pole filter.  So for frequencies below 250Hz the accelerometer response is flat and you don't have to worry about any variation in magnitude at the low frequencies.

    Regards,

    Venkat

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