Power quality analyzer
Technical Specification
  • Description

    Class A remote analysis

    The Sonel PQM-711 versatile power quality analyser for remote analysis in the A class is a device suitable for use on all types of networks with a rated voltage range from 110 V to 1000 V either directly or indirectly through transformers.

    Based on advanced technology, the Sonel PQM-711 power quality analyser allows comprehensive measurement, analysis and recording of 50/60 Hz power network parameters and power quality according to the European standard EN 50160 and the Regulation of the Minister of Economy on detailed conditions for the operation of the power system.

    Class A remote analysis


    • Remote control and data transfer through a built-in GSM modem.
    • Anti-theft feature – SMS notification in the event of position change (built-in GPS receiver).
    • Real-time clock synchronized to GPS protocol.
    • Remote control of the analyzer via software: Sonel Analysis (Wi-Fi and GSM for Windows) or Sonel Analysis Mobile (Wi-Fi for Android).

    Measured parameters

    • Transients up to ±8000 V with max. sampling frequency 10 MHz. Minimal transient time is 650 ns (only PQM-711)
    • Voltages L1, L2, L3, N, PE (five measurement inputs) – average, minimum, maximum and instant values within the range up to 1000 V, interoperability with voltage transducers.
    • Currents L1, L2, L3, N (four measurement inputs) – average, minimum, maximum and instant values, current measurement within the range up to 6 kA (depending on applied current clamp), interoperability with current transducers.
    • Measurement of control signals up to 3000 Hz.
    • Crest factors for current (CFI) and voltage (CFU).
    • Frequency within the range of 40 Hz – 70 Hz.
    • Active power (P), reactive power (Q), distortion power (D), apparent power (S) with identification of the nature of reactive power (capacitive, inductive).
    • Calculation of reactive power using the Budeanu method and IEEE 1459 method.
    • Active energy (EP), reactive energy (EQ), apparent energy (ES).
    • Power factor, cosφ, tanφ.
    • K factor (transformer overload caused by the harmonics).
    • Up to 50th harmonics for voltage and current.
    • Interharmonics measured as groups.
    • Total Harmonic Distortion (THD) for voltage and current.
    • Short-term (PST) and long-term (PLT) flicker (IEC 61000-4-15 class A).
    • Unbalance of voltage (IEC 61000-4-30 class A) and current.
    • Current events detection including waveforms recording.
    • Current and voltage events recording with waveforms (up to 1 s) and RMS1/2 graphs with 30 s maximum recording time.
    • Current and voltage waveforms recording after each averaging period.

    Wide range of mains to analyze

    • With rated frequency 50/60 Hz
    • With rated voltages: 64/110 V;110/190 V; 115/200 V; 120/208 V 127/220 V; 133/230 V; 220/380 V; 230/400 V; 240/415 V; 254/440 V; 265/460 V; 277/480 V; 290/500 V; 400/690 V; 480/830 V (for systems with N conductor)
    • Direct current
    • Systems:
      • single-phase
      • split-phase with common N
      • three-phase – WYE with and without N conductor
      • three-phase – Delta
      • three-phase – WYE and Delta Aron
      • with current and voltage transducers


    PQM-711 has a built-in GPS receiver ensuring real time clock accuracy and an integrated GSM modem that facilitates remote analyzer operation. Furthermore, PQM-711 is also equipped with a transient recorder (sampling frequency 10 MHz, voltage range up to ±8000 V).

    An additional trump card of the analyzer is the built-in Wi-Fi communication module, providing a number of advantages: no restrictions on file transfer, no data transfer costs, use of local wireless infrastructure... This gives the user the opportunity to adapt to the conditions prevailing on the site. They can supervise measurements from a convenient location – for example, an area without electromagnetic interference – using a laptop, smartphone or tablet.

    Displaying data

    PQM-711 can be operated using a touch screen computing device equipped with Sonel Analysis software (Windows) or Sonel Analysis Mobile app (Android). The user can supervise the measurements and conduct diagnostics while maintaining mobility – he doesn’t even have to be near the analyzer. In typical applications, the device plays the role of a remote display and an intermediate storage of measurement data with the functionality of a router. Therefore, the user can also connect to it using a wireless network – for example, to transfer the collected registrations to a desktop computer.


    PQM-711 is widely used in the professional power industry. It provides full 4-quadrant analysis, meeting the needs of energy consumers and producers, such as renewable energy, including photovoltaic and wind farms. It enables forecasting failures in distribution networks. It provides analysis of the load capacity of networks and transformers, as well as recording their current states. In addition, it is powerful investment tools. Thanks to PQM-711, the user will obtain the necessary data for development of power infrastructure, predict potential problems, and finally – verify the correctness and quality of implementation.


    Sonel Analysis software – application delivered as standard accessory, indispensable for working with PQM-series analyzers. It enables:

    • analyzer configuration,
    • data reading from logger,
    • preview of network parameters in real time (with capability of reading via GSM modem),
    • deletion of data in the analyzer,
    • data presentation in tables,
    • data presentation in charts,
    • data analysis in compliance with standard EN 50160 (reports) and other user defined reference conditions,
    • independent support of multiple analyzers,
    • analyzer firmware updates.

    The software enables readout of selected parameters and their visualization in real time. These parameters are measured independently from the registration saved on the memory card. The user can view:

    • charts of voltage and current progression (oscilloscope),
    • charts of voltage and current over time,
    • phasor diagram,
    • measurements of multiple parameters,
    • harmonics and harmonic powers,
    • interharmonics.
  • Technical Specification

    Possible measurements:

    • Measurements according to EN 50160
    • Voltage L1, L2, L3, N-PE
      - average, minimum, maximum and instantaneous values, range to 1000 V, ability to work with voltage transformers,
    • Current L1, L2, L3, N (four inputs)
      - average, minimum, maximum and instantaneous values, measurement current with range to 6 kA (depends on used clamp), ability to work with current transformers,
    • Crest factor for voltage and current,
    • Frequency from 40 Hz to 70 Hz ,
    • Active, reactive, distortion, apparent power, including the type of reactive power (capacitive, inductive),
    • Power recording:
      - Budeanu method,
      - IEEE 1459,
    • Active, reactive, apparent energy (in 4-quadrants terms),
    • Power factor, cosφ, tgφ,
    • K factor (transformer overload caused by the harmonics),
    • Up to 50th harmonics for voltage and current,
    • Total Harmonic Distortion (THD) for voltage and current,
    • Short-term (PST) and long-term (PLT) flicker,
    • Unbalance of voltage and current,
    • Current events detection including waveforms recording,
    • Current and voltage waveforms recording after each averaging period.
    • Mains signalling up to 3000 Hz.
    • Transients up to ±8000 V, max 10 MHz, minimal transient capturing time is 650 ns.
    • All parameters meet Class A acc. IEC 61000-4-30 standard.

     The device is designed to work with networks:

    • with nominal frequency 50/60 Hz,
    • with nominal voltage:
      64/110 V; 110/190 V; 115/200 V; 120/208 V; 127/220 V; 133/230 V; 220/380 V; 230/400 V; 240/415 V; 254/440 V; 265/460 V; 277/480 V; 290/500 V; 400/690 V; 480/830 V (for systems with N conductor)
    • DC network

    Supported networks:

    • single-phase,
    • split-phase with common N,
    • three-phase – WYE with and without N conductor,
    • three-phase – Delta,
    • three-phase – WYE and Delta Aron,
    • with current and voltage transducers.
    Specification   Measuring range Max. resolution Accuracy
    AC voltage (TRMS) - 0.0…1000.0 V 4 significant digits ±0.1% Un
    Crest Factor Voltage 1.00…10.00 (≤1.65 for voltage 690 V) 0.01 ±5%
    Crest Factor Current 1.00…10.00 (≤3.6 Inom) 0.01 ± 5% m.v.
    AC current TRMS - depends on the clamp* 4 significant digits ±0.1% of nominal range (add clamps accuracy)
    Frequency - 40.00...70.00 Hz 0.01 Hz ±0.01 Hz
    Active, reactive, apparent power and distortion - depends of configuration (transformers, clamp) up to 4 decimal places depends on configuration (transformers, clamp)
    Active, reactive apparent energy - depends of configuration (transformers, clamp) up to 4 decimal places the same as above
    cosφ and Power Factor (PF) - -1.00...1.00 0.01 ±0.03
    tgφ - -10.00...10.00 0.01 depends on Active and Reactive power accuracy
    Harmonics Voltage same as for AC voltage TRMS same as for AC voltage TRMS ±5% Uh for Uh ≥ 1% Un ±0.05% Un for Uh < 1% Un
    Harmonics Current same as for AC current TRMS same as for AC current TRMS ± 5% Ih for Ih ≥ 3% In ± 0.15% In for Ih < 3% In
    Total Harmonics Distortion Voltage 0.0..100.0% 0.1% ±5%
    Total Harmonics Distortion Current 0.0..100.0% 0.1% ±5%
    Harmonics active and reactive power - depends on configuration (transformers, clamp) depends on current and voltage minimum value -
    Angle between voltage and current harmonics - -180.0…+180.0o 0.1o ±(h x 1o)
    K-Factor - 1.0...50.0 0.1 ±10%
    Flicker - 0.20...10.00 0.01 ±5%
    Unbalance Voltage and Current 0.0...20.0% 0.1% ±0.15% (absolute error)
    Mains signalling Voltage 5...3000 Hz 0.01 Hz ±0.15% Uh for 1...3% Uh ,5% Un for 3...15% Uh
    Transients (max. 10 MHz) Voltage ±8000 V 5 V ±(5% + 25 V)

    *• F-1A1, F-2A1, F-3A1 clamp: 0...1500 A AC (5000 Ap-p)
    • F-1A, F-2A, F-3A clamp: 0...3000 A AC (10 000 Ap-p)
    • F-1A6, F-2A6, F-3A6 clamp: 0...6000 A AC (20 000 Ap-p)
    • C-4A clamp: 0...1000 A AC (3600 Ap-p)
    • C-5A clamp: 0...1000 A AC/DC (3600 Ap-p)
    • C-6A clamp: 0..10 A AC (36 Ap-p)
    • C-7A clamp: 0...100 A AC (360 Ap-p)

  • Files

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