Multifunctional Electrical Installation Meter | MPI 507

The MPI-507 is used for precise measurements of electrical installation parameters. Its sleek, compact and ergonomic design holds a wealth of measurement functions.  Although it is one of the smallest multifunction meters on the market, it surprises one with its versatility, intuitive operation, and extended capabilities.

It has been designed for specialists in the installation and electrical industries, as well as for professional measuring engineers. Its main advantage is the quick measurement of fault loop impedance in circuits with RCD. It measures short-circuit loop parameters, insulation resistance, the resistance of protective and equalizing connections, earth resistance, as well as the testing of residual current devices (RCD) of type AC and A.

The functions are selected with a rotary switch. Additional parameters are set with buttons located on the housing interface. It is easy to use and priced very competitively.  The device settings are saved automatically even when the battery is completely discharged. The backlit display and buttons make it suitable for use in low light. The large memory eliminates the need for taking notes during the measurements.

It is suitable for inspecting the safety of electrical systems in households and industrial facilities. Its housing is robust and weather-resistant with an IP67 rating. Bluetooth wireless communication allows easy transfer of data. Use Sonel Reports PLUS software to generate a report on measurements for electric shock protection. Saving the downloaded data to the simplest formats and printing is provided by free Sonel Reader software.



Measurement of short circuit loop parameters

  • Measurement of short circuit loop impedance in networks with rated voltage: 220/380 V, 230 V/400 V, 240/415 V and frequency 45…65 Hz, operating voltage range: 180…460 V
  • Indication of short circuit loop resistance R and short circuit loop reactance X
  • Measurements of short circuit loop impedance with 15 mA current, without tripping the RCD circuit breaker
  • Maximum test current: 7.6 A (at 230 V), 13.3 A (at 400 V)

Testing RCD breakers of AC, A types

  • Testing of prompt, short-delay and selective RCDs with rated current values 10, 15, 30, 100, 300, 500 mA
  • Measurement of IA trip current and tripping time tA for currents 0.5 IΔn, 1 IΔn, 2 IΔn, 5 IΔn
  • RE and UB measurement without RCD tripping
  • Extended AUTO function of RCD measurement, with the possibility of measuring ZL-PE with low current
  • Measurement of IA and tA during one RCD tripping

Earth resistance measurement

  • Measurement with 3-pole method​​​​​​​

Insulation resistance measurement

  • Test voltage 100 V, 250 V, 500 V

Measurement of resistance of protective conductors and equipotential bonding’s

  • Measurement of protective connections continuity with a ±200 mA current in accordance with EN 61557-4
  • Autocalibration of test leads – any leads can be used
  • Low current resistance measurement with sound signaling

Phase sequence indication



Measurement functionsMeasurement rangeDisplay rangeResolutionAccuracy
Fault loop impedance
Fault loop ZL-PE, ZL-N, ZL-L0.13 Ω…1999 Ω acc.
to IEC 61557
0.00 Ω…1999 Ωfrom 0.01 Ω±(5% m.v. + 3 digits)
Fault loop ZL-PE in RCD modefrom 0.5 Ω…1999 Ω acc. to IEC 615570.00 Ω…1999 Ωfrom 0.01 Ωfrom ±(6% m.v. + 5 digits)
Measurements of RCD parameters
RCD tripping test and measurement of tripping time tmeasuring current 0,5 IΔn, 1 IΔn, 2 IΔn, 5 IΔn
general and short-time delay RCD0 ms…300 ms0 ms…300 ms1 ms±(2% m.v. + 2 digits)
selective RCD0 ms…500 ms0 ms…500 ms1 ms±(2% m.v. + 2 digits)
Measurement of RCD tripping current IA measuring current 0,3 IΔn…2,0 IΔn
for sinusoidal residual current (AC type)3.0 mA…500 mA3.0 mA…500 mAfrom 0.1 mA±5% IΔn
for unidirectional residual current and unidirectional with the 6 mA DC bias (type A)3.5 mA…420 mA3.5 mA…420 mAfrom 0.1 mA±10% IΔn
Earth resistance
3-pole method0.68 Ω…1999 Ω acc. to IEC 61557-50.00 Ω…1999 Ωfrom 0.01 Ωfrom ±(3% m.v. + 5 digits)
Insulation resistance
Measuring voltage 100 V100 kΩ…99.9 MΩ acc. to IEC 61557-20 kΩ…99.9 MΩfrom 1 kΩ±(5% m.v. + 8 digits)
Measuring voltage 250 V250 kΩ…199.9 MΩ acc. to IEC 61557-20 kΩ…199.9 MΩfrom 1 kΩ±(5% m.v. + 8 digits)
Measuring voltage 500 V500 kΩ…599.9 MΩ acc. to IEC 61557-20 kΩ…599.9 MΩfrom 1 kΩ±(5% m.v. + 8 digits)
Resistance of protective conductors and equipotential bondings
Measurement of resistance of protective conductors and equipotential bondings with ±200 mA current0.12 Ω…400 Ω acc. to IEC 61557-40.00 Ω…400 Ωfrom 0.01 Ω±(2% m.v. + 3 digits)
Measurement of resistance with low current0.0 Ω…1999 Ω0.0 Ω…1999 Ωfrom 0.1 Ω±(2% m.v. + 3 digits)
Phase sequence indicationin the same direction (correct), opposite direction (incorrect), UL-L voltage: 100 V…440 V (45 Hz…65 Hz)

“m.v.” – measured value 

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