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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 Jarrett

    Thanks for your response. I understand what you mean, but it still is not clear to me how to interpret the graph. Maybe you can help by clarifying it to me further.

    Let's say I have a DRO. Your graph tells me the sensitivity to vibration in the z-axis is

    10^-8 g^2/Hz

    at 100 kHz offset frequency. If my vibration occurs in a bandwidth of 100 Hz, that would give me a sensitivity of

    10^-3 g or 0.001g

    at 100 kHz offset frequency. What does that mean in terms of frequency deviation / phase noise under vibration? I don't understand how the amount of acceleration (g) or vibration (g^2/Hz) indicates the sensitivity of a particular device. What am I missing here?

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  • Hi Jarrett

    Thanks for your response. I understand what you mean, but it still is not clear to me how to interpret the graph. Maybe you can help by clarifying it to me further.

    Let's say I have a DRO. Your graph tells me the sensitivity to vibration in the z-axis is

    10^-8 g^2/Hz

    at 100 kHz offset frequency. If my vibration occurs in a bandwidth of 100 Hz, that would give me a sensitivity of

    10^-3 g or 0.001g

    at 100 kHz offset frequency. What does that mean in terms of frequency deviation / phase noise under vibration? I don't understand how the amount of acceleration (g) or vibration (g^2/Hz) indicates the sensitivity of a particular device. What am I missing here?

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