Figure 2.3: How The Nexus 1262 Meter Processes Inputs - Electro Industries Nexus 1262 Installation & Operation Manual

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Figure 2.3: How the Nexus 1262 Meter Processes Inputs
Voltage and current signals enter the meter and are sampled at up to 256 samples per cycle. Each
sample is resolved to a digital value using a 16-bit analog-to-digital converters. The 16-bit A/D
converter is for the real-time measurements. The Nexus® 1262 meter does not have a second converter
for ITIC/CBEMA Log or Waveform recording.
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 the meter time to standard universal
time. The Line Synchronization Feature may be Enabled or Disabled. If this feature is not Enabled, the
Internal Clock provides the time sychronization. All readings and logs are time stamped to the nearest
millisecond.
Meter setup 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 2.3.4. Several additional communication channels operate simultaneously, including the option-
al Ethernet/Modem Combo Card (separate connections that can be used simultaneously). External sys-
tems 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
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