Investigation analysis and findings (b)(4).Was the complaint confirmed? yes."distribution history: it could not be determined when the complaint product was manufactured because the lot/serial number of the completed unit was not provided.Manufacturing record review: a review of the device history record could not be performed because the lot/serial number of the completed unit was not provided.However, it should be noted at the time of manufacture records from each lot are thoroughly reviewed to ensure that products are released meeting all coopersurgical quality release specifications.Should the complaint product lot/serial number be provided going forward, the device history record will be reviewed, and this complaint amended accordingly.Incoming inspection review: incoming inspection record review not applicable to this product.Service history record: service history not applicable for this product.Historical complaint review: a review of the 2-year complaint history did show similar reported complaint conditions.Product receipt: the complaint product has not been returned to coopersurgical as this is a field service complaint.Visual evaluation: this is a field service complaint, there was no product returned for evaluation.If further information becomes available at a later date this investigation will be amended accordingly.Functional evaluation: this is a field service complaint, there was no product returned for evaluation.If further information becomes available at a later date this investigation will be amended accordingly.Root cause: this is a field service complaint, there was no product returned for evaluation.If further information becomes available at a later date this investigation will be amended accordingly.Likely root cause can be attributed to modern low voltage electronic equipment which is most commonly powered by switching power supplies (psus) (e.G.Laptop/tablet power supplies, usb chargers, etc).These are often ungrounded types, which means that there is no direct connection to earth.Protection against electric shock is provided by means of isolation between the mains input and the low voltage output, instead of by using an earth connection.As there is no direct connection to earth, a charge can build up on the output of the power supply.Depending on the design of the power supply, this can be to a sufficient level to cause a tingling sensation, or a similar sensation to a static electricity shock when initially touching a conductive part of the device (or a connected device).Corrective action: the action is to change the tablet power supply and usb hub to an alternative type (surface pro docking station).Subsequent measurements, using the surface pro docking station, indicate that the level of charge is low enough not to be felt by the user.Coopersurgical will continue to monitor this complaint condition for any trends.Reason: no further training required at this time.Preventative action activity: coopersurgical will continue to monitor this complaint condition for any trends.
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