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IMPROVED SYNCHRONIZING PROCEDURE OF PDAS TO DELIVERY THE COMMON SENSE OF THE TIME TO STAND ALONE MEASUREMENT INSTRUMENT

IMPROVED SYNCHRONIZING PROCEDURE OF PDAS TO DELIVERY THE COMMON SENSE OF THE TIME TO STAND ALONE MEASUREMENT INSTRUMENT,Domenico Luca Carnì,Domenico G

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IMPROVED SYNCHRONIZING PROCEDURE OF PDAS TO DELIVERY THE COMMON SENSE OF THE TIME TO STAND ALONE MEASUREMENT INSTRUMENT   (Citations: 2)
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The paper proposes the optimized evolution of the previous procedure to synchronize the PDAs to the node of the Distributed Measurement System (DMS) in order to physically bring the common sense of time to the stand alone node. The improvements concern with (i) the selection of the clock node as reference one, (ii) the contemporaneous synchronization of all the involved PDAs, and (iii) the compensation of the effects of the drift of the electronic components on the number of system cycle after whom the control of the MI must be executed. The improvements pointed out originate from the practical evaluation of the performance of the previous synchronization procedure. The improved procedure meets the advantages of the synchronization based on the IEEE std 1588. Experimental tests are shown to validate the synchronization procedure and to highlight the advantages.
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    • ...The solution proposed in [5] regards with the synchronization of the PDA to the common reference clock of DMS, before to bring “physically” the clock reference time to the MI. In particular, the Master PC is previously synchronized by the standard IEEE 1588 [6] to the boundary clock of the DMS...
    • ...Characteristic aspect of this procedure is that the system’s cycles of the PDA [7] is used in the place of the system time and the timestamp mechanism [5], because they introduce time delay multiple of the ms [5]...
    • ...Characteristic aspect of this procedure is that the system’s cycles of the PDA [7] is used in the place of the system time and the timestamp mechanism [5], because they introduce time delay multiple of the ms [5]...
    • ...The synchronization is performed between the two ESHs, according to [10], and, in separately modality, between the two PDAs according to [5]...
    • ...PDA synchronized according to the procedure presented in [5], based on the lookup table, and the XHI pointed out...
    • ...In particular, curve (a) refers to the trend of the mean value of the delay obtained with the first technique [5] and the curve (b) is the trend of the standard deviation...

    Domenico Grimaldi, et al. Synchronization of stand alone measurement instruments by PDA and embe...

    • ...Fig.2 shows the block scheme of the hardware connections and the block diagram of the performed operations in (i) the First Phase in which the synchronization is performed between two HIs, Fig.2 a) and b), and (ii) the Second Phase in which the HIs are employed to synchronize two stand alone MIs [10], Fig.2 c) and d)...

    Domenico Grimaldi, et al. Reduction of the random variation of time delay to synchronize Measure...

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