Australian Distributor

PQM4000 Class A Power Quality Meters

PQM4000 Class A Power Meters Front View

Key Features

  • Panel mount 192x144 DIN size

  • Harmonics up to the 50th & interharmonics measurement

  • Data recording for further EN 50160 analysis

  • Data recorded in standard PQDIF & CSV file formats

  • Embedded web server for local & remote viewing

  • Communication on RS-485, Ethernet and WiFi networks

  • GPS time synchronisation module for accurate timing

  • Internal rechargeable backup battery

  • Certified according to IEC/EN 61000-4-30:2015 Ed.3, Class A for voltage characteristics


Contact us for technical assistance, pricing and availablity


The PQM4000 class A power quality meter is a ‘high-end’ power monitoring device, able to monitor and record power quality parameters in AC power networks. It provides highly accurate measurement of voltage, current and power characteristics according to Class A specification.

Whilst the PQM4000 provides standard power measurement data for three-phase systems, the device also acts as an event and fault recorder/logger, capable of storing a high number of voltage events and disturbances, frequency variations, inrush currents, etc. Additional power quality data can be recorded, such as flicker, phase imbalance, harmonics and interharmonics and mains signalling. Furthermore, extra voltage and current measurement channels provide the capability to monitor neutral potential and earth leakage current.

The powerful recording features of the PQM4000 provide the ability to capture and record all types of standard and power quality data simultaneously. All this information can be locally recorded for an extensive time period due to the high 16 gigabyte memory capacity. This allows for a complete EN 50160 analysis to be performed on logged data. Events and disturbances also provide waveform recording together with RMS values. Recordings can be transferred in different ways. Users can download them directly through the web interface or set a scheduled automatic data upload to a remote server.

The PQM4000 includes several different communication ports so that users can access the device and internal data in different ways:

  • The Ethernet ports on the front and rear of the device allow complete control of the instrument. Web access for real-time monitoring, device setup, stored data transfer and maintenance operations.

Moreover, different I/O channels are provided to enhance the instrument features. A user-friendly multilingual interface is provided for the web server which simplifies the access to instrument operations.

PQM4000 is available in 2 models. One for external standard CTs with 1 or 5A output and another for current clamps with 1 or 3V output. In this way maximum flexibility is granted even on existing systems.

Main Features


  • High resolution TFT screen with capacitive touch
  • Up to 4 voltage and up to 5 current input channels
  • 1/5A CT or 1/3V current clamp Connect
  • Voltage inputs for direct connection or through PT/VT
  • Voltage characteristics monitoring according to IEC/EN 61000-4-30
  • Parameter recording for statistical analysis according to EN 50160
  • Harmonic and interharmonic measurement
  • Integrated web server for local and remote device management
  • Two Ethernet and one RS485 ports for easy communication
  • One front USB host port for memory stick
  • RTC (real time clock) synchronisation for accurate time information by NTP or internal GPS module
  • Up to 16GB internal memory for data recording
  • Data recorded in standard PQDIF and CSV formats
  • Isolated digital inputs, digital outputs and 0-20mA analogue outputs
  • Integrated rechargeable backup battery


  • Three-phase 3 and 4 wire or single-phase operating mode
  • Voltage direct connection, through PT or by using electronic VT
  • Transformer ratio setup for voltage and current inputs to bring back all values to the primary one
  • Setup of nominal values on which the 3-phase voltage and current variations are measured
  • Configuration of the thresholds to enable the recording of voltage variations and events
  • V4 channel independent programmable high and low thresholds and reference values
  • Frequency variation trigger setup to capture frequency events
  • Monitoring and recording of the changes relevant to the digital input status
  • Auto diagnosis function and automatic restart without losing device configuration and recorded data
  • Internal real time clock synchronization for accurate time information by GPS (NMEA 0183 protocol and 1PPS signal) or NTP server
  • Fast voltage and current events data capture with 10ms (@50Hz) time accuracy
  • Mains signalling real time monitoring by 5 user programmable frequency components
  • Suitable for 50 and 60Hz systems
  • Continuous operation event if mains power lost due to the backup battery
  • Optional WIFI port, programmable by the user in AP (access point) or Client mode
  • USB port provides the possibility to transfer recorded data from internal memory, transport setup information and update instrument firmware


  • Voltage events recording (sags, swells, interruptions) with storage of 1/2c RMS values and waveforms
  • Inrush current recording with storage of RMS values and waveforms
  • Data LOG recording function of MIN/AVG/MAX values of selectable parameters and programmable rate time
  • Functional event LOG for the device operating status
  • Digital input status change LOG
  • Automatic data upload to FTP server in case of events
  • Scheduled data upload to FTP server

Inputs & Outputs

  • 4 isolated digital inputs for remote management of control signals
  • 4 isolated digital outputs for alarm signaling or energy pulse generation
  • 4 isolated analog outputs for current loop signaling


  • One rear 10/100Mb Ethernet port for a permanent connection inside the panel
  • One front 10/100Mb Ethernet port for local communication
  • Communication protocols: HTTP, HTTPS, FTP, NTP, Modbus TCP
  • Integrated web server for all operations (measurement view, recording preview, setup, data download)
  • One RS485 port for standard Modbus RTU communication
  • Optional integrated GPS for accurate RTC synchronisation
  • Optional integrated WIFI port with external antenna

Data Analysis

  • Standard file formats allow for quick viewing 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 power quality standard