Power quality analyzer Nexus 1500

Transient recorder and power meter Nexus 1500

Transient recorder and power meter With Advanced Power Quality and Communication

Really New and Really Different

  • Accu-Measure Auto-Calibrating Metrology
  • 0.06% Energy Accuracy
  • Perfect Choice for Critical Applications
  • Color Touch Screen Display
  • Ultra-High Performance

Communication, I/O and User Interface

  • Standard 10/100BaseT Ethernet Port
  • Expandable Serial Ports (Dual RS485 Ports)
  • Modbus ASCII, Modbus TCP, DNP 3.0 Level 2
  • 8 Simultaneous Connections via Ethernet
  • Optional Second Ethernet Port
  • Vivid 256 Color Display
  • Optional 100BaseT Fiber Optic Port
  • Data Download Speed 20 Times Faster than Existing Technology
  • Up to 16 Relay Outputs
  • Up to 40 Digital Status Inputs


From today's utility giants or Fortune 100 companies, to local electrical municipals, an effective energy management and power monitoring program is critical to success. The Nexus® 1500 meter is the most advanced monitoring product on the market today, providing you with the total picture of energy usage and power quality from any metered point in a power distribution network, allowing you to make power related decisions quickly and effectively.

  • Technology specifically designed for Utilities and Industry
  • Real Time power quality monitoring and analysis identifies PQ and reliability events quickly
  • Manage peak demand electrical power usage
  • Report data quickly and reliably using Ethernet or serial communications
  • Advanced transient analysis for critical power systems
  • Also the perfect solution for Circuit Breaker or Transformer monitoring

The Perfect Monitoring Choice for Critical Applications

  • Utility Transmission Line Substations
  • Power Generation
  • Highly Critical Industrials
  • Hospitals / Medical

High Performance Revenue Metering Features

  • Extensive Load Profiling: log virtually unlimited historical trending.
  • System Events (Anti Tampering): the unit provides extensive usage information for detection of unauthorized access. The unit records:
    • Resets
    • Programming changes
    • Password Access changes
    • Time changes
    • Power Up / Down
    • Change of firmware
  • Transformer Loss and Line Loss Compensation: for both iron and copper and total substation losses.
  • Load Aggregation/Universal Metering: pulse inputs can be used to aggregate or accumulate different loads; utility products such as gas and water can also be accumulated.
  • Time of Use Capability: bi-directional consumption and demand; 20 year calendar.
  • Max/Min Integration and Recording: time-stamped max and min values for all measured readings.
  • Coincidental Readings: identify number of capacitors needed, peak inefficiencies, etc.
  • Password Protection Prevents Unauthorized Tampering: User programmable passwords.
  • Predicted Demand: The meter uses rate of change to predict the peak demand of the next demand interval. Perfect for proactive load shedding.

Accu-Measure™ Auto-Calibrating Measurement Technology

EIG's patented Accu-Measure™ Auto-calibration technology allows a field-mounted metering device to achieve precision accuracy and maintain the accuracy over temperature and time. This technique is unique to EIG and consists of precise measurement technology and high precision internal reference standards.

Accu-Measure™ Technology features:

  • 8 Independent High-Speed 16-Bit A/D Converters.
  • Internal Reference for periodic Auto-calibration.
  • Internal temperature sensor to sense deviations in instrument temperature.
  • Designed to allow for repeatable and consistent energy measurement results.

Benefits of Auto-Calibrating Technology:

  • Improves accuracy over temperature.
  • Improves repeatability, reducing meter settling time.
  • Improves long-term stability.
  • Relies on precision internal DC references to maintain accuracy.


200 msec*



Voltage (L-N)



5 Digit

Voltage (L-L)



5 Digit




5 Digit


0.03 Hz

0.01 Hz

5 Digit

kW @ Unity PF



5 Digit

kW @ 0.5 PF



5 Digit




5 Digit

kVAR (0.5-0.9 PF)



5 Digit




3 Digit

Harmonic Magnitudes



3 Digit




16 Digit




16 Digit




16 Digit

* Note: Readings are in percent of reading where applicable (more accurate standard), not in percent of full scale (less accurate standard).

V-Switch™ Technology

The Nexus® 1500 meter is equipped with EIG's exclusive V-Switch™ technology, which enables meter upgrades in the field without removing the meter from service. Nexus® 1500 V-Switch™ keys include:

  • V1: Standard Nexus® 1500 meter with 128 Megabytes memory + 512 samples per cycle
  • V2: V1 + 1 Gigabyte total memory + 1024 samples per cycle
  • V3: V2 + 10MHz Transient Recording

Detailed Power Quality Analysis and Waveform Recording

EIG's Nexus® 1500 meter is one of the industry's premier fault and voltage disturbance recorders. This instrument captures a comprehensive picture history of voltage reliability and power quality events within mass memory for detailed and extensive forensic engineering analysis.

16 Bit Waveform and Fault Recorder:

  • Record up to 1024 samples per cycle consisting of transient captures at over 166,000 samples per cycle.
  • Voltage and current recording with pre and post-event analysis.
  • Fault recording offers 8 times full scale capture capability.
  • 16 bit A/D converter provides precise waveform resolution.
  • Both hardware and software triggers available.
  • View harmonic magnitudes to 512th order for each voltage and current channel.
  • Real time harmonic magnitudes are resolved to the 128th order.
  • Percent THD and K-Factor.
  • Conduct power quality analysis at the high end of the harmonic magnitude spectrum.

High-Speed Status Input Triggers:

  • Waveforms are recorded at time of status change.
  • Input change and waveform recording are time-stamped to a 1 msec resolution.
Multi-channel Waveform Recorder
[Multi-channel Waveform Recorder]
Phasor Analysis
[Phasor Analysis]
Sub-cycle Transients with 10 MHz Pickup Frequency
[Sub-cycle Transients with 10 MHz Pickup Frequency]
EN61000-4-15 Flicker Compliance
[EN61000-4-15 Flicker Compliance]

Multiple Programmable Memory Logs

1 Gigabyte Extensive Onboard Mass Memory Securely Records All Data Virtually Unlimited Historical trending Logs

The Nexus® 1500 meter includes vast amounts of memory. A user partitions this memory for log storage by setting up both the number of logs and the number of parameters per log. 8 independent historical logs with up to 64 parameters per log are available. With such extensive memory, the meter will log for years.

Extensive Historical Trending
[Extensive Historical Trending]
Out of Limit Log
[Out of Limit Log]

Out Of Limit Log

The unit offers an independent out of limit log. This allows a user to download out of limit information to obtain a sequence of events for any occurrence. Utilizing the 1msec clock resolution, the logs can be combined with different metered points throughout a distribution system to provide an accurate system-wide depiction of a power disturbance.

Event-Triggered Waveform Recording Log

The Nexus® 1500 meter records waveforms with a resolution of up to 1024 samples per cycle. The amount of waveform recording is based on the amount of memory installed. The unit records the waveform when a value goes out of limit and when the value returns to normal. All information is time-stamped to the nearest 1msec. 8 on-board High-Speed Inputs can be tied to the waveform recording.

  • Compare Relay Trip and Breaker Timing graphically
  • Provides Fault and Breaker integrity analysis

The unit can be programmed to take more than one recording every time an event occurs. Thousands of cycles can be recorded per event.

ITIC / CBEMA Trending


The Nexus® 1500 meter stores a separate CBEMA log that records magnitude and duration of voltage and current surges and sags for every power quality event. This allows the user to conduct real time CBEMA analysis without downloading all stored waveforms. The separate CBEMA log also allows the unit to provide a more comprehensive picture of power quality over time.

Configurable Memory Allocation Table

System Events Log

The Nexus® 1500 meter logs extensive usage information for detection of unauthorized access. The unit records:

  • Resets
  • Programming changes
  • Password Access Changes
  • Time Changes
  • Power Up / Power Down
  • Change of Firmware

Input Status Log

This log allows the user to record when the internal inputs change status.

Uploadable Flash Memory

The Nexus® 1500 meter utilizes uploadable flash memory technology on all processors and DSPs located in the unit. This insures that the unit can be upgraded without removing it from service.

Set Limit Control

The Nexus® 1500 power monitor provides programmable setpoints for user settings. This feature allows a user to configure the meter to be used as a control device for many applications such as:

  • Capacitor Control
  • Load Shedding
  • Automatic Transfer Schemes
  • Transformer Monitoring & Control
  • Redundant Protection (Not designed for Primary Over-Current Protection)
  • Many Other Control Functions

Waveform / Transient Logs

The 1500 can log waveform, utilizing its programmable memory for all surges, sags and transients within the scope of what it sees. Thousands of events can be logged with resolution up to 1024 samples per cycle and transients at 10MHz resolution.

Custom Allocatable Memory Structure

A user can custom define log sizes within the meter. Thus the full memory can be allocated specifically to the desired function.

On-Board Communication for Every Application

Standard Communications:

  • 100 BaseT Ethernet RJ45 Port
  • ANSI Optical Port and USB 2.0 port

8 Built-In Digital High-Speed Status Inputs:

  • Inputs automatically sense whether the circuit is externally wetted
  • If externally wetted, input up to 150VDC is accepted
  • If internally wetted, the meter supplies the necessary voltage for the control application.

Sync. Check-Aux. Volt Input—High-speed Vaux input can be used for:

  • Neutral to ground or aux voltage readings
  • Synchronizing schemes
  • Obtain the freq, magnitude, and phase angle on both sides of a switch, or between generator and bus voltage for synch schemes.

Optional RS485 and Second Ethernet Port:

  • Two identical built-in serial ports: Up to 115k baud
  • Standard protocols include Modbus RTU/ASCII and DNP 3.0 Level 2
  • Also available, second Ethernet port, either RJ45 or Fiber Optic
  • Separate MAC address and configuration for each Ethernet port.

Industry Leading DNP 3.0 Level 2 Plus —complies with DNP Level 1 and Level 2 certification requirements, plus:

  • Up to 136 measurements (64 Binary Inputs, 8 Binary Counters, 64 Analog Inputs) can be mapped to DNP static points in the customizable DNP Point map
  • Up to 16 relays and 8 resets can be controlled though DNP
  • Report-by-exception processing (DNP Events) deadbands can be set on a per-point basis
  • 250 available events, of combinations of four events (Binary Input Change, Frozen Counter, Counter Change, Analog Change)
  • Available Freeze commands: Freeze, Freeze/No-Ack, Freeze with Time, Freeze with Time/No-Ack
  • Freeze with Time command enables the meter to have internal time driven Frozen Counter and Frozen counter event data
  • Programmable secondary scale allows users to maximize 16 bit analog input resolution precisely around the desired parameters providing enhanced resolution to SCADA.

Rapid Response™ Ethernet - Download data over 20 times faster than existing Nexus® technology

  • Rapid Response™ 10/100BaseT Ethernet allows for 8 simultaneous connections of Ethernet Modbus TCP protocol. Two sockets for DNP 3.0 protocol are also available. Rapid Response™ technology insures that the Nexus® meter is optimized to download data as quickly as possible.
  • Utilizing a novel Modbus TCP approach, the meter will download up to 20 times faster than existing Nexus® 125X Series meters. No long wait time to retrieve data.

Schema Nexus 1500

Internal I/O

Relay Outputs

  • 6RO1: 6 Relay Outputs Card
    • 5 amps/125 volts AC/DC rated
    • Form C (Latching)

Pulse Outputs

  • 485P: Dual RS485/Pulse Output Card
    • 4 KYZ Pulses
    • Pulse width: 5 msec
    • Relay type: Solid State
    • Dual RS485 Ports

Input Status

  • 16DI1: 16 Status Inputs card
    • Used for alarm detect or pulse accumulation
    • Up 150 volts DC wetted or non-wetted (24 volt DC nominal provided)

Note: The Nexus® 1500 meter provides one I/O slot for the 485P (Slot 1), and two I/O slots for the 6RO1 and 16DI1 (Slots 3 and 4).

External I/O Analog Outputs

  • 1mAON4/1mAON8: 4 or 8 Analog Outputs, 0-1mA, self-powered, scalable, bidirectional
  • 20mAON4/20mAON8: 4 or 8 Analog Outputs, 4-20mA, self-powered, scalable
  • Wiring: Common Mode
  • Accuracy: 0.1% of Full Scale
  • Calibration: Self-calibrating
  • Scaling: Programmable
  • Ordering: Up to 4 Analog Output modules for each Nexus® 1500 meter.

Digital Dry Contact Relay Outputs:

  • 4RO1: 4 Relay Outputs, 5 amps, 125 AC/DC, Form C – Latching Relays
  • Ordering: 1 module in addition to internal modules.

Digital Solid State Pulse Outputs:

  • 4PO1: 4 Solid State Pulse Outputs, Form A or C KYZ pulses
  • Maximum Pulse Speed: 20 pulses per second
  • Ordering: Up to 4 modules per meter.

Output Module Accessories (Required):

  • PSIO: Required for using an Output module and must be ordered with the module. The Nexus® 1500 does not have internal power for Output modules.
  • MBIO: Mounting bracket for Output modules. Must be ordered with Output module.

Bright and Easy To Read

The Nexus® 1500 meter features an LCD color display with touch screen capability. The display uses bright TFT glass with a high temperature and long life LED backlight. LED is superior to CCFL solutions due to better temperature and half-life specifications. Screen displays include:

  • Real-time viewing (voltage, current, power, demand)
  • Accumulated energy and time of use readings
  • Flicker readings
  • Alarms
  • Phasor analysis
  • Harmonic spectrum analysis and waveforms
  • Real time trending
  • Log status
  • Configuration settings

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