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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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  • Hi

    I read through the paper you suggested and it has not fundamentally changed my understanding of vibration sensitivity and its measurement. The only graphs in the paper that have the same units as your graph (g^2/Hz) are graphs showing an amount of vibration. Nowhere are those units used to indicate vibration sensitivity. 

    Is it possible that the graph in the datasheet is incorrect? I think its units should be 1/g. It is possible that the traces are correct if you just correct the units.

    Do you perhaps have any direct measurements for this unit related to vibration sensitivity? E.g. phase noise measured under vibration conditions - the measurements that would have been done to generate the graph in the datasheet. I would appreciate it if you could send me those measurements, please.

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  • Hi

    I read through the paper you suggested and it has not fundamentally changed my understanding of vibration sensitivity and its measurement. The only graphs in the paper that have the same units as your graph (g^2/Hz) are graphs showing an amount of vibration. Nowhere are those units used to indicate vibration sensitivity. 

    Is it possible that the graph in the datasheet is incorrect? I think its units should be 1/g. It is possible that the traces are correct if you just correct the units.

    Do you perhaps have any direct measurements for this unit related to vibration sensitivity? E.g. phase noise measured under vibration conditions - the measurements that would have been done to generate the graph in the datasheet. I would appreciate it if you could send me those measurements, please.

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