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# HMC-C200 DRO vibration sensitivity graph

Hi

I am not that familiar with vibration sensitivity, but I am trying to make sense of this graph that is given in the datasheet for the HMC-C200 DRO:

Can somebody please explain to me what this means? If the y-axis units were /G it would have made sense to me. As far as I know, /G is the usual unit for vibration sensitivity, and then I could calculate the phase noise of the device under specific vibration conditions. The unit g2/Hz used in this graph usually refers to power spectral density of vibration, but then the graph does not make any sense to me.

Any help would be appreciated, thanks.

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• the units of g^2/Hz is just as you have stated, power spectral density ( or Acceleration spectral density ASD). the point of this type of measurement is to remove the bandwidth (filter) from the measurement to normalize the data. you could use this data to calculate the gRMS at any bandwidth (filter) you chose.

EX. the graph shows a very small number (10^-8) for the PSD.

multiply that by the BW of you filter or the BW of interest, then take the square root to get gRMS.

Reply
• the units of g^2/Hz is just as you have stated, power spectral density ( or Acceleration spectral density ASD). the point of this type of measurement is to remove the bandwidth (filter) from the measurement to normalize the data. you could use this data to calculate the gRMS at any bandwidth (filter) you chose.

EX. the graph shows a very small number (10^-8) for the PSD.

multiply that by the BW of you filter or the BW of interest, then take the square root to get gRMS.

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