Catalog index: WMGBPAT86

Portable Appliance Tester

Welding machine safety without secrets

Ensure safe use of welding and electrical equipment with the Sonel PAT-86 electrical equipment safety meter.

The Sonel PAT-86 advanced meter is perfect for control measurements of welding machines and other electrical devices. The instrument allows to measure parameters having an impact on the safe use of the equipment, such as resistance of protective conductors, insulation resistance, continuity of connections, leakage currents, power, RCD and PRCD. The PAT-86 model is especially dedicated to testing welding equipment according to the PN-EN 60974-4 standard. It allows, among other things, to check the rated voltage of welding equipment in no-load condition, the welding circuit leakage current and the primary leakage current.

The Sonel PAT-86 electrical equipment safety meter will come in handy in those areas where safety is of particular importance. Reliable wherever welders, power tools, three-phase appliances or domestic appliances need to be inspected.

Safety of welding machines outright


  • Extensive measuring system enables:
    • measurement of welding equipment parameters:
      • rated voltage of welding devices in no-load condition,
      • welding circuit leakage current,
      • primary leakage current,
    • protective conductor resistance measurement,
    • residual voltage measurement,
    • measurement of insulation resistance in three points,
    • measurement of substitute, differential and touch leakage current,
    • functional test,
    • test of RCD and PRCD switches,
    • …and much more.
  • Intuitive user interface.
  • Cooperation with a label printer and QR code scanner.
  • Robust, compact housing.
  • Operation time at rechargeable battery power supply: up to 1 hour.


PAT-86 is used wherever safety is the most important thing. Ideally suited to situations where it is necessary to check welders, power tools, three-phase devices and household appliances.


PAT-86 was created for testing welding equipment in compliance with EN 60974-4 standard.


Thanks to the extensive measuring part, PAT-86 enables comprehensive checking of electrical devices. The touch screen and autoprocedures section make testing quick and efficient.

The meter cooperates with a label printer and QR scanner, which greatly facilitates the recordkeeping of tools. The following printouts are available:

  • initial measurement report,
  • QR code, where information on performed tests and the parameters of the tested device are saved. These data can be read and added to the meter memory using the optional QR code scanner.

The whole picture is complemented by a compact and durable housing. It provides instrument protection during both measurements and transport.


The memory has a tree structure. For each device tested it contains its description, location of measurements, customer data and registration number.


The meter provides many modes of transmission of measurement results: via USB, LAN and WiFi. In addition, it is possible to upload the results to a USB stick.

Dedicated PAT Analysis software allows for data management and also reports preparation – in several versions, depending on the user’s needs. In addition, it is possible to use the PAT Server solution. This system allows you to work in many modes, including:

  • smooth data management,
  • online upload to server,
  • work through a web browser,
  • work in task ordering mode,
  • storing copies of data on the server.
Measurement functions Range Resolution Accuracy
Resistance of protective conductor (PE)
I = 200 mA / 10 A / 25 A
up to 19.99 Ω from 1 mΩ from ±(3% m.v. + 4 digits)
Insulation resistance
UISO = 100 V / 250 V / 500 V / 1000 V
up to 599.9 MΩ from 1 kΩ ±(5% m.v. + 8 digits)
Current (clamp measurement) up to 24.9 A from 1 mA ±(5% m.v. + 5 digits)
Visual test
Continuity check of protective conductor (PE)
Insulation resistance measurement at three points
IEC cable test
Functional test
Apparent power S up to 3.99 kVA from 1 VA ±(5% m.v. + 3 digits)
Active power P up to 3.99 kW from 1 W ±(5% m.v. + 3 digits)
Reactive power Q up to 3.99 kvar from 1 var ±(5% m.v. + 3 digits)
Power Factor (PF) up to 1.00 0.01 ±(10% m.v. + 5 digits)
Current consumption for power measurement up to 15.99 A 0.01 A ±(2% m.v. + 3 digits)
THD for voltage and current up to 99.9% 0.1% ±(5% m.v. + 5 digits)
Cosφ up to 1.0 0.1 ±(5% m.v. + 5 digits)
Voltage measurement for welding machines
RMS voltage URMS up to 170.0 V 0.1 V ±(2.5% m.v. + 5 digits)
DC and AC peak voltage up to 240.0 V 0.1 V ±(2.5% m.v. + 5 digits)
Voltage U0 up to 240.0 V 0.1 V ±(2.5% m.v. + 5 digits)
Leakage current measurement
Welding circuit leakage current IL up to 14.99 mA 0.01 mA ±(5% m.v. + 2 digits)
Leakage current of the welding machine’s primary circuit IP up to 14.99 mA 0.01 mA ±(5% m.v. + 5 digits)
PE leakage current and differential leakage current up to 19.9 mA 0.01 mA ±(5% m.v. + 2 digits)
Substitute leakage current up to 19.9 mA 0.01 mA ±(5% m.v. + 2 digits)
Touch leakage current up to 4.999 mA 0.001 mA ±(5% m.v. + 3 digits)
RCD and PRCD switch test
Measurement of RCD parameters according to IEC 61557 up to 300 ms 1 ms ±(2% m.v. + 2 digits)
Measurement of RCD tripping current IA for sinusoidal residual current (AC type) up to 30 mA 0.1 mA ±5% IΔn
Measurement of power network parameters
Voltage up to 265.0 V 0.1 V ±(2% m.v. + 2 digits)
Frequency up to 55.0 Hz 0.1 Hz ±(2% m.v. + 2 digits)

m.v. – measured value

Data Sheet                                      

User Manual                                   

Declarations of conformity