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Using NTP as a timing source

Güralp Systems always recommend using GNSS (GPS, GLONASS, Beidou…) for data time-stamping wherever possible. In some situations, however, it is necessary to use NTP. Note that, even in idea situations, NTP is several orders of magnitude less accurate than GNSS. This can cause significant problems for seismic observatories but may be adequate for structural monitoring or earthquake early-warning applications.

The following Güralp systems are capable of using NTP for synchronisation of the ADC clocks:

✶ This document does not apply to these systems, which use a different operating system.

Platinum will not generate NMEA/PPP for the digitiser if the reported NTP error is greater than the configured threshold value of the "Maximum NTP error" parameter. This feature exists so that a system with intermittent internet access can fall back to the digitiser's internal clock if the estimated NTP error becomes too large. The initial setting is very conservative and normally needs to be increased.

To troubleshoot a system configured to synchronise to NTP: