Catalog index: WMGBMPI540PV

Multi-function meter of electrical system parameters

The multifunctional meter of electrical installation parameters Sonel MPI-540-PV is an advanced tool created in particular for measuring parameters of photovoltaic installations. With the use of one device, it is possible to carry out a whole range of tests on the DC and AC sides in accordance with the guidelines of the PN-EN 62446 standard. In addition, the Sonel MPI-540-PV is also used to carry out all measurements to determine the safety condition of domestic as well as industrial electrical installations. The presented meter is a device with advanced capabilities, dedicated to specialists operating in the installation and electrical industry.

When measuring the parameters of a photovoltaic installation, the meter automatically recalculates the parameters to the STC (Standard Test Conditions) reference conditions. Measurements of voltages, currents and power on the AC and DC side of the inverter will verify its efficiency. After transferring the data stored in the meter’s memory to the Sonel PE6 program, it is possible to generate a report of photovoltaic installation parameters.

In order to automate measurements, the Sonel MPI-540-PV meter has been additionally enriched with the function of testing residual current devices in Auto mode. The instrument also has measurement sequences pre-programmed by the manufacturer (so-called autotests), which can be extended with own sequences if necessary. The capabilities and functionality of the meter will be additionally enhanced by a suitably selected additional accessory, e.g. the AutoISO-1000C adapter, which enables the automatic measurement of insulation resistance of 3-, 4- and 5-core cables.

Much more than a multifunctional meter

  • The largest touch screen on the market (7”) – remarkable ergonomics and ease of use
  • Removable microSD memory card – easy increase of memory capacity
  • Li-Ion battery – longer operation of the meter
  • MPI-540-PV: measurement of photovoltaic installations according to EN 62446 standard
  • MPI-540-PV: photovoltaic installation test report with Sonel Reports PLUS software
  • Three-phase power recorder – advanced power quality diagnostics
  • Real time display of network parameters – immediate evaluation of the test site conditions
  • Parameters measured in accordance to class S of EN 61000-4-30 standard – high accuracy of measurements
  • Energy cost calculator – quick evaluation of potential savings
  • Measurement of all parameters related to earthing and protection against electric shock – one device instead of several
  • Quick measurement of the fault loop impedance in networks secured with RCD without triggering (up to several seconds) – time saver
  • Auto measurements – the ability to perform automatic measurements in sequence – simplified measurements
  • Fast path from measurements to report – time saver


The meter has above-average functionality. It combines the measuring capabilities of several devices, while ensuring equally good accuracy.

  • The MPI-540-PV instrument can measure photovoltaic installations in accordance with the EN 62446 standard:
    • continuity of protective and equipotential bondings,
    • earth resistance,
    • insulation resistance on the DC side,
    • open circuit voltage UOC,
    • short circuit current ISC,
    • work currents and powers on both DC and AC side,
    • inverter efficiency.
  •  MPI-540-PV can record 50/60 Hz power quality parameters in accordance to S class of EN 61000-4-30:
    • voltage L1, L2, L3, – average values in the range up to 500 V,
    • L1, L2, L3 currents, – average values, current measurement in the range up to 3 kA (depending on the current probes used),
    • frequency in the range of 40 Hz – 70 Hz, » active (P), reactive (Q) and apparent (S) power,
    • power factor (PF), cosφ,
    • harmonics (up to 40th for voltage and current),
    • total harmonic distortion (THD) for current and voltage.
  •  MPI-540-PV can be used for all measurements for commissioning of electrical installations in accordance with applicable regulations:
    • short circuit loop impedance (also in circuits secured with RCDs),
    • RCD parameters,
    • insulation resistance,
    • earth resistance (4 measurement methods + soil resistivity measurement),
    • continuity of protective and equipotential bondings,
    • light intensity measurement,
    • phase sequence test,
    • motor rotation direction test

Automatic installation safety test

MPI-540 / MPI-540-PV allow safety control of residential, commercial and industrial electrical installations. Measurements can be easily automated with:

  • auto mode of residual current devices (RCD) tests,
  • auto measurements – freely configurable measuring sequences,
  • AutoISO-1000C adapter for automatic insulation resistance test of 3-, 4- and 5-conductor cables, without switching.

Photovoltaics under supervision

MPI-540-PV is an extremely universal meter, designed in particular for testing photovoltaic installations. The device allows a complete set of tests on the DC and AC side – in accordance with the guidelines of EN 62446 standard.

Measuring parameters related to the photovoltaic installation, the instrument will automatically convert them to the STC (Standard Test Conditions) reference conditions. Measurements of voltage, current and power on the AC and DC side of the inverter allow to verify its efficiency. Sonel Reports PLUS software enables creating PV installation test report with measurement results saved meter’s in memory.

Three-phase power quality recorder

The device has a three-phase power quality recorder with the LIVE mode view and the possibility to register electrical network parameters such as voltage, current, power, harmonics and THD. The meter enables reading of selected parameters and their graphic presentation on the screen in real time. These parameters are measured and displayed concurrently with the recording on the memory card. In the LIVE mode, the user can see:

  • voltage and current waveforms (oscilloscope),
  • voltage and current timeplots,
  • a phasor graph,
  • display of multiple parameters in tabular form,
  • spectrum graph of current and voltage harmonics.

Ease of reading

The device is equipped with a color TFT LCD touch screen with a resolution of 800×480 pixels and a diagonal of 7”, which allows for convenient operation and easy reading of parameters and plotted waveforms. This screen size enables displaying more information, available at any time of use. The interface is visible in all conditions – also thanks to the appropriate size of displayed symbols. Included stylus allows to work also with dielectric gloves.

Built-in help system

The device has built-in help screens with measurement diagrams. Thanks to this you can easily and quickly check and make sure how to connect to a given system depending on the type of performed measurement.

Increased resistance to environmental conditions

The MPI-540-PV meter will cope well in difficult environmental conditions. Protection against penetration of dust and water is ensured by a unique housing with a level of protection IP51. It is resistant to mechanical damage, and a special design allows you to easily protect the touch screen by shielding using the cover of the meter. In addition to the fact that it protects against damage, it also allows you to conveniently carry and use the device in different positions.

Communication and software

A very strong feature of the device is the multitude of communication interfaces and cooperation with external software. You can easily transfer measurement data to your computer via USB port, removable SD memory card, or wireless communication (Bluetooth*, Wi-Fi ). In order to generate a report on measurements for electric shock protection, use Sonel Reports PLUS software. Saving the downloaded data to the simplest formats and printing is provided by free Sonel Reader software. The specialized, free Sonel Analysis software is used to read and analyze data from the power quality recorder.

pecifications – electrical installation parameters

Measurement functions Measurement range Display range Resolution Accuracy
Fault loop impedance
Fault loop ZL-PE, ZL-N, ZL-L 0.13 Ω…1999.9 Ω acc. to IEC 61557 0.00 Ω…1999 Ω from 0.001 Ω ±(5% m.v. + 30 digits)
Fault loop ZL-PE in RCD mode from 0.50 Ω…1999 Ω acc. to IEC 61557 0.00 Ω…1999 Ω from 0.01 Ω from ±(6% m.v. + 5 digits)
Measurements of RCD parameters
RCD tripping test and measurement of tripping time tA measuring current 0.5 IΔn, 1 IΔn, 2 IΔn, 5 IΔn
general and short-time delay RCD 0 ms…300 ms 0 ms…300 ms 1 ms from ±(2% m.v. + 2 digits)
selective RCD 0 ms…500 ms 0 ms…500 ms 1 ms from ±(2% m.v. + 2 digits)
Measurement of RCD tripping current IA measuring current 0 0.2 IΔn…2.0 IΔn
for sinusoidal residual current (AC type) 3.3 mA…1000 mA 3.3 mA…1000 mA from 0.1 mA ±5% IΔn
for unidirectional residual current and unidirectional with the 6 mA DC bias (type A) 3.5 mA…700 mA 3.5 mA…700 mA from 0.1 mA ±10% IΔn
for direct residual current (type B)) 2.0 mA…1000 mA 2.0 mA…1000 mA from 0.1 mA ±10% IΔn
Earth resistance
3- and 4-pole method from 0.50 Ω…1.99 kΩ acc. to IEC 61557-5 0.00 Ω…1,99 kΩ from 0.01 Ω from ±(2% m.v. + 3 digits)
3-pole + clamp method 0.00 Ω…1.99 kΩ 0.00 Ω…1.99 kΩ from 0.01 Ω from ±(2% m.v. + 4 digits)
2-clamp method 0.00 Ω…99.9 kΩ 0.00 Ω…99.9 kΩ from 0.01 Ω from ±(10% m.v. + 4 digits)
Resistance-to-earth 0.0 Ω m…99.9 kΩm 0.0 Ωm…99.9 kΩm from 0.1 Ωm Depending on accuracy of RE measurement
Insulation resistance
Measuring voltage 50 V 50 kΩ…250 MΩ acc. to IEC 61557-2 0 kΩ…250 MΩ from 1 kΩ from ±(3% m.v. + 8 digits)
Measuring voltage 100 V 100 kΩ…500 MΩ acc. to IEC 61557-2 0 kΩ…500 MΩ from 1 kΩ from ±(3% m.v. + 8 digits)
Measuring voltage 250 V 250 kΩ…999 MΩ acc. to IEC 61557-2 0 kΩ…999 MΩ from 1 kΩ from ±(3% m.v. + 8 digits)
Measuring voltage 500 V 500 kΩ…2.00 GΩ acc. to IEC 61557-2 0 kΩ…2.00 GΩ from 1 kΩ from ±(3% m.v. + 8 digits)
Measuring voltage 1000 V 1000 kΩ…9.99 GΩ acc. to IEC 61557-2 0 kΩ…9.99 GΩ from 1 kΩ from ±(3% m.v. + 8 digits)
Resistance of protective conductors and equipotential bondings
Measurement of resistance of protective conductors and equipotential bondings with ±200 mA current 0.12 Ω…400 Ω acc. to IEC 61557-4 0.00 Ω…400 Ω from 0.01 Ω ±(2% m.v. + 3 digits)
Measurement of resistance with low current 0.0 Ω…1999 Ω 0.0 Ω…1999 Ω from 0.1 Ω ±(3% m.v. + 3 digits)
Light intensity
Measurement in luxes (lx) 0 lx…399.9 klx 0 lx…399.9 klx from 0.001 lx from ±(2% m.v. + 5 digits)
Measurement in feet-candles (fc) 0 fc…39.99 kfc 0 fc…39.99 kfc from 0.001 fc from ±(2% m.v. + 5 digits)
Phase sequence indication in the same direction (correct), opposite direction (incorrect), UL-L voltage: 95 V…500 V (45 Hz…65 Hz)

“m.v.” – measured value


3-phase power quality recorder

The device is designed to work with mains:

  • with nominal frequency 50/60 Hz
  • with nominal voltage: 64/110 V, 110/190 V, 115/200 V, 127/220 V, 220/380 V, 230/400 V, 240/415 V, 254/440 V, 290/500 V
  • DC networks

Supported systems:

  • single-phase
  • split-phase with common N
  • three-phase – WYE with and without N conductor
  • three-phase – Delta
Parameter Measuring range Max. resolution Accuracy
Alternating voltage (TRMS) 0.0…500 V 0.01% Unom ±0,5% Unom
Alternating current (TRMS) depending on clamp* 0.01% Inom ±2% m.v. if m.v. ≥ 10% Inom, ±2% Inom if m.v. < 10% Inom , (error does not account for clamp error)
Frequency 40.00…70.00 Hz 0.01 Hz ±0.05 Hz
Active, reactive, apparent and distortion power depending on configuration (transducers, clamps) 4 significant digits depending on configuration (transducers, clamps)
Active, reactive and apparent energy secondo la configurazione (sensori, pinze) 4 significant digits as power error
cosφ and power factor (PF) 0.00…1.00 0.01 ±0.03
Voltage as for alternating voltage True RMS as for alternating voltage True RMS ±5% m.v. if m.v. ≥ 3% Unom, ±0,15% Unom if m.v. < 3% Unom
Current as for alternating current True RMS as for alternating current True RMS ±0,5% m.v. if m.v. ≥ 10% Unom, ±0,5% Unom jeśli m.v. < 10% Unom
Voltage 0.0…100.0% (relative to RMS value) 0.1% ±5%
Current 0.0…100.0% (relative to RMS value) 0.1% ±5%
Unbalance factor 0.0…10.0% 0.1% ±0.15% (absolute error)

AC currentmeasurment (True RMS) with clamp

C-4A C-5A C-6A C-7A F-1A F-2A F-3A
Rated current 1000 A AC 1000 A AC, 1400 A DC 10 A AC 100 A AC 3000 A AC 3000 A AC 3000 A AC
Frequency 30 Hz…10 kHz DC…5 kHz 40 Hz…10 kHz 40 Hz…1 kHz 40 Hz…10 kHz 40 Hz…10 kHz 40 Hz…10 kHz
Output signal level 1 mV / 1 A 1 mV / 1 A 100 mV / 1 A 5 mV / 1 A 77.6 μV / 1 A 38.8 μV / 1 A 19.4 μV / 1 A
Max. diameter of measured conductor 52 mm 39 mm 20 mm 24 mm 360 mm 235 mm 120 mm
Minimum accuracy ≤0,5% ≤1,5% ≤1% 0,5% 1% 1% 1%
Battery power
Lead length 2.2 m 2.2 m 2.2 m 3 m 2.2 m 2.2 m 2.2 m
Measurement category IV 300 V IV 300 V IV 300 V III 300 V IV 600 V IV 600 V IV 600 V
Ingress protection IP40 IP40 IP40 IP40 IP67 IP67 IP67

Photovoltaic installation parameters

Measurement functions Display range Resolution Accuracy
Open circuit voltage UOC 0.0 Ω…1000 V from 0.1 V from ±(3% m.v. + 2 digits)
Short circuit current ISC 0.00 Ω…20.00 A 0.1 A ±(3% m.v. + 0.10 A)

Data Sheet                                      

User Manual                                   

Declarations of conformity