PXe-PQA4000 Power Quality Analyzer

The PXe-PQA4000 Power Quality Analyzer monitors and records all major power quality events and parameters.  It provides an accurate measurement of events and disturbances affecting Power Quality and usage, based on its voltage and current measurement according to Class A specification.

The PQA simultaneously measures consumption and demand as it captures harmful events and faults. It is capable of storing a high number of voltage events and disturbances, frequency variations, inrush current, etc.

Additional PQ data can be recorded, such as Flicker, Unbalance, Harmonics and Inter-harmonics, Mains Signalling. It also provides standard power measurement data for three-phase systems. Extra voltage and current measurement channels give the possibility to monitor Neutral Potential and Earth Leakage current.

The PXe-PQA4000 is available in 2 models:

One for external standard CT’s with 1 or 5A output and another model for current clamps, conventional and flexible types. In this way maximum flexibility is granted even on existing plants – requiring retrospective monitoring . The powerful recording features allow  capture and recording of all types of power measurement and PQ data simultaneously. All this information can be recorded for long time periods due to the high memory capacity, in this way a complete EN 50160 analysis can be performed.

Events and disturbances also provide waveform recording together with RMS values. Recordings can be transferred in different ways: users can download them directly through a web interface or set an automatic scheduled data upload to a remote server or transfer it to an USB flash drive. The PXe-PQA4000 includes different communication ports so the user can access it in different ways. The Ethernet ports on the front and rear panels allow complete control on the instrument. Web access for real-time monitor, device setup, stored data transfer and maintenance operations. An additional RS485 port gives the possibility to interconnect to monitoring systems such as a PLC.

The integrated GPS receiver provides accurate time information regardless of the location where the meter is installed in a distributed monitoring system. Moreover, different I/O channels are provided to enhance the instrument features. It is provided with a high resolution TFT display with touch screen which allows for fast and direct instrument management. A User-friendly multilingual interface is common to its web server, very useful for on-site instrument operations.

Power Quality Analyzer Display


  • Direct Voltage connection up to 1000V or via PTs for MV and HV systems.
  • 4th voltage channel for measurement of potential difference between Neutral and Protective Earth.
  • 5 current channels to be used with Flexible CT, std CTs or clamps according to the model.
  • 4th current channel dedicated for Neutral current measurement: the current measuring range (CT or Clamp primary and secondary) can be programmed together with the main three-phase channels.
  • 5th current channel reserved for Earth Leakage monitoring, with separate current measuring range setup to ensure different sensitivity from the main channels.
  • Demand values of currents, powers and true power factors calculated on a programmable time period (only DMD version).
  • Display of daily demand graphic with programmable power limit to monitor overconsumption (only DMD version).
  • Voltage and current harmonics up to 63rd.
  • Voltage harmonics, THD, distortion parameters (only ENH version).
  • Current Total, THD, distortion parameters (only ENH version).
  • Three-phase 3 and 4 wire or single-phase operating mode.
  • Suitable for 50 and 60 Hz systems.
  • Fast simultaneous sampling on all 9 channels, at 1024 samples/cycle.
  • All measured voltage characteristics certified according to IEC/EN 61000-4-30:2015 Ed.3, Class A.
  • All measured current characteristics according to IEC/EN 61000-4-30:2015 Ed.3, Class A (CT instrument model certified).
  • Measurement of additional power quality parameters, such as K Factor.
  • CLAMP instrument model allows upload of one or more current clamps, linearisation tables for increased accuracy (optional).

Recordings & data storage

  • Voltage event recording (sags, swells, interruptions) with storage of ½c RMS values and waveforms.
  • Sag/swell recording on 4th voltage channel with storage of ½c RMS values and waveforms. • Rapid Voltage Changes measurement and event recording.
  • Power frequency variation monitoring and recording with ½c RMS values and waveforms.
  • Slow event recording on Frequency, Unbalance Ratio, Flicker, Voltage THD and Mains Signalling variations.
  • Up to 4 thresholds programmable for slow frequency events: 2 High threshold levels and 2 Low threshold levels (only ENH version).
  • Overcurrent recording on three-phase current channels with storage of ½c RMS values and waveforms.
  • Data LOG function for Min/Avg/Max values of selectable parameters, at programmable rate.
  • Energy counter LOG at programmable rate.
  • Functional event LOG to report the changes of device operating status, useful to keep the instrument condition under control.
  • Digital input status change LOG.
  • Demand LOG function at programmable rate (only DMD version).
  • Demand MAX values of currents, powers and true power factors with a timestamp stored for different time periods -previous month, actual month, previous week, actual week, previous day, actual day- (only DMD version).
  • Automatic data upload to FTP server started by frequency events or scheduled at preset time day by day.
  • Recordings containing big amount of data ½c RMS with waveform and Min/Avg/Max are recorded directly in standard PQDIF files.
  • For other type of recordings like slow events and LOG files, data is provided in standard CSV files.
  • In case of a failure on the PQM auxiliary power line, the monitoring and recording functions remains active due to the backup battery.

Inputs & outputs

  • 4 isolated digital inputs for remote management of control signals.
  • 4 isolated digital outputs for alarm signalling or energy pulse generation.
  • 4 isolated analog outputs for real time parameter variation transmission.


  • Two Ethernet ports, one designed for a permanent installation on the instrument rear and one for occasional connections on the front panel.
  • RS485 port for data reading in Modbus RTU.
  • WIFI port, programmable in different modes: as Access Point to take advantage of the broadcasted WIFI network or as Client mode for a standard WIFI connection.
  • Front USB host port useful to transfer in a simple way data recorded from the instrument to an external device, but also to save setup or to upgrade instrument firmware.

Data analysis

  • Standard file formats give the possibility to have a quick view and analysis on all stored data without any special software.
  • PQM-Analyzer software is provided to perform statistical analysis and generate reports on recorded data according to EN 50160 PQ standard.

Power Quality Analyzer Display

PQA4000 Front display

PQM4000 Back panel


Power supply

Auxiliary power voltage: 100…240 VAC 50/60 Hz / 65…250 VDC

Measurement inputs

Voltage inputs for direct connection: Phase-neutral (L-N): max 580 V RMS CAT III
Phase-phase (L-L): max 1000 V RMS CAT III CT inputs: max 7 A RMS


Active energy: Class 0.5S, compliant to IEC/EN 62053-22
Reactive energy: Class 1, compliant to IEC/EN 62053-23

I/O Channels

Digital inputs: 4 optoisolated 24 VDC
Analog outputs: 4 optoisolated 4…20 mADC / max load 500 Ω
Digital outputs: 4 passive optoisolated 24 VDC / max 50 mA


System memory: 128 MB Flash, 256 MB RAM
Recording memory: 16 GB


Ethernet ports: 2 Auto MDIX RJ45 10/100 Base Ethernet
RS485 port: 1 optoisolated, 4800…115200 bps
GPS port: 1 SMA female connector
WIFI port: 1 SMA female connector

Environmental conditions

Installation and use code: PQI-A-FI1

Mechanical characteristics

Mounting: Panel mount 192×144 DIN size
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