Campbell Scientific CR6 CR6 Measurement and Control System - Page 368
Synchronizing Measurements
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Section 8. Operation 8.1.9 Synchronizing Measurements Reading List: • Synchronizing Measurements - Overview (p. 71) • Synchronizing Measurements - Details (p. 368) Timing of a measurement is usually controlled relative to the CR6 clock. When sensors in a sensor network are measured by a single CR6, measurement times are synchronized, often within a few milliseconds, depending on sensor number and measurement type. Large numbers of sensors, cable length restrictions, or long distances between measurement sites may require use of multiple CR6s. Techniques outlined below enable network administrators to synchronize CR6 clocks and measurements in a CR6 network. Care should be taken when a clock-change operation is planned. Any time the CR6 clock is changed, the deviation of the new time from the old time may be sufficient to cause a skipped record in data tables. Any command used to synchronize clocks should be executed after any CallTable() instructions and timed so as to execute well clear of data-output intervals. Techniques to synchronize measurements across a network include: 1. LoggerNet (p. 89) - when reliable telecommunications are common to all CR6s in a network, the LoggerNet automated clock check provides a simple time synchronization function. Accuracy is limited by the system clock on the PC running the LoggerNet server. Precision is limited by network transmission latencies. LoggerNet compensates for latencies in many telecommunication systems and can achieve synchronies of
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