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®
Figure 2.2: How the Nexus
1272 Meter Processes Inputs
The digitized signals are then passed to the appropriate processor. Real-time measurements are
calculated in one processor and made available for meter readings and historical logs. A separate
processor performs waveform recording. Calculated data and logs are stored in memory for delivery to
displays, external systems and download processes.
The meter includes a time synchronizing input port that accepts an industry standard IRIG-B signal to
synchronize meter time to standard universal time. If there is no IRIG-B signal, the meter uses a time
synchronizing input port that uses line frequency to synchronize meter time to standard universal time.
The Line Synchronization Feature may be Enabled or Disabled. If it is not Enabled, the Internal Clock
provides time sychronization. All readings and logs are time stamped to the nearest millisecond.
Eight status channels provide input of status or pulse signals. Status inputs are date/time stamped to the
nearest millisecond and placed in the event log. Pulse inputs are multiplied by a user-supplied factor
and accumulated in reading registers. These accumulated values can also be totalized. This feature
makes the Nexus® 1272 meter a good fit in universal metering applications. Any one input channel can
be selected to accept an End of Interval pulse from another meter.
Meter set-up parameters and all historical log data are stored in nonvolatile RAM. The user has multiple
log functionality. Data is made available through the onboard display. Display screens are described in
Section 2.3.3. Several additional communication channels operate simultaneously, including the option-
al Ethernet/Modem Combo Card.. External systems can be connected to either of the RS485 ports or
the Ethernet/Modem port. Stored data can be downloaded through the RS485 ports, the
Ethernet/Modem port or the IR port.
Electro Industries/GaugeTech
Doc # E151701
2-2
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