PXe-PQA4000 Power Quality Analyser

The monitoring and recording of all major power quality events and parameters are facilitated by the PXe-PQA4000 Power Quality Analyser. Accurate measurement of events and disturbances affecting Power Quality and usage is provided, based on voltage and current measurement according to Class A specification.

Simultaneous measurement of consumption and demand, along with the capturing of harmful events and faults, are enabled by the PQA. It possesses the capability to store a high number of voltage events and disturbances, frequency variations, inrush current, etc.

Additional PQ data, including Flicker, Unbalance, Harmonics, and Inter-harmonics, as well as Mains Signalling, can be recorded. Furthermore, standard power measurement data for three-phase systems is provided. The availability of extra voltage and current measurement channels offers the possibility to monitor Neutral Potential and Earth Leakage current.

Available in two models:

Two models of the PXe-PQA4000 Power Quality Analyser are available: one for external standard CT’s with 1 or 5A output and another model for current clamps, both conventional and flexible types. This ensures maximum flexibility, even for existing plants that require retrospective monitoring. The recording features of the device are powerful, allowing for the simultaneous capture and recording of all types of power measurement and PQ data. The high memory capacity enables the recording of this information for long time periods, facilitating a comprehensive EN 50160 analysis.

Waveform recording, together with RMS values, is provided for events and disturbances. The recordings can be transferred in various ways. Users have the option to download them directly through a web interface or set up automatic scheduled data uploads to a remote server. Another alternative is transferring the recordings to a USB flash drive. Different communication ports are incorporated into the PXe-PQA4000, enabling users to access it through multiple means. Ethernet ports on the front and rear panels allow for complete control of the instrument. Web access allows real-time monitoring, device setup, stored data transfer, and maintenance operations. Additionally, an RS485 port provides the ability to interconnect with monitoring systems such as a PLC.

Accurate time information, regardless of the installation location in a distributed monitoring system, is provided by the integrated GPS receiver. Furthermore, the instrument features various I/O channels to enhance its functionality. It is equipped with a high-resolution TFT display with a touch screen, facilitating fast and direct instrument management. The web server offers a user-friendly multilingual interface that proves 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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