The 37 seconds is the current offset between UTC and TAI timescales. The system time on the server PC is set on the UTC timescale, whereas the PTP 1588 protocol usually uses the TAI timescale. To correct this offset, follow the Configuring IEEE 1588 synchronisation with the NI PXI-668x Timing and synchronisation module tutorial.
Please refer to UTC, TAI, and GPS Time Scale for NI Synchronization Interfaces for further information.
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